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I am restoring my '73 Tang and the radiator fan needs to be stripped and repainted.

I bought "Aircraft Stripper" (which says in the fine print not to use on airplanes) and applied as directed.  Results: Negative.

I heated the part: Negative.    Used sand paper to remove surface paint:  Negative   Used M.E.K. to remove surface barriers;  Negative.

Wrapped stripper and fan in paper towel : No   Wrapped in Aluminium foil;  No

 

As you can see it still has very little effect.

Sanding to base metal is not really an option.

SAM_0335.jpg

 

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Any Ideas?

 

According to this "Stripper" is is supposed to buckle the old paint and then I scrape it off.   No Way

 

Ugh !!!

 

Roy

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I am restoring my '73 Tang and the radiator fan needs to be stripped and repainted.

I bought "Aircraft Stripper" (which says in the fine print not to use on airplanes) and applied as directed.  Results: Negative.

I heated the part: Negative.    Used sand paper to remove surface paint:  Negative   Used M.E.K. to remove surface barriers;  Negative.

Wrapped stripper and fan in paper towel : No   Wrapped in Aluminium foil;  No

 

As you can see it still has very little effect.

Sanding to base metal is not really an option.

SAM_0335.jpg

 

tiny image hosting

 

 

Any Ideas?

 

According to this "Stripper" is is supposed to buckle the old paint and then I scrape it off.   No Way

 

Ugh !!!

 

Roy

I don't know Roy ...there are things I strip and things I have sandblasted.    FANS are something I have sandblasted as you will never get the jelled up paint off all the rivets and seams IMO.

 

In using aircraft striper I've found you have to apply many coats AND be removing BEFORE the last coat dries too much.   It works on certain paints on certain surfaces great ...not so much on others.

 

Mark

P.S.  I wouldn't be suprised if FANS were painted and baked!

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That sounds like powder coating.

 

Personally I have had good luck with the POR15 brand gel stripper. Other thing that works if it is rusty is washing soda electrolite with a DC power supply.

 

Some Powdercoaters will have a chemical bath that will strip powder coating and most anything else. Might be worth your time to call around.

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OK, first off this is a FLEX FAN. They are dangerous things unless your car just sits there and looks pretty. I will check with a friend who was an engineer at the factory where these were made, but to be honest, I don't remember if these were painted or powder coated as we did both paint systems. They WERE baked regardless.

BUT as this IS a FLEX FAN DO NOT sandblast it. The blasting could damage the integrity of the spring steel, causing it to break.......... and take your head off. That is fact not fiction!

If I were you my friend, I'd chuck it were it can never  be used again and buy a 4 blade solid fan as on a 71 for instance. If YOUR car is a concours trailer queen, then OK I get it, but a 40+ year old flex fan, I would never trust it at anything above idle and certainly not at high rpms. These are unexploded bombs and you will never know when it's about to blow. They should never have been allowed in the first place. I've seen what happens when a flex fan blade explodes and berries itself in 4" of oak in a test chamber.

If you must repaint it get it professionally chemically dipped if home solutions don't work.

 

EDIT NOTE: While in the shower, it came to me that the flex fan blades were NOT painted at all, just the spider. Thinking back 40 years is getting tougher by the day!!

I would have think that the fan Helicopter has, HAS been repainted, but the above applies. I've not heard back from my engineer buddy who, while not working in the FAN department, has better knowledge of the production methods. I'll update when I hear form him.

Geoff.

 I learn something new every day!

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OK, first off this is a FLEX FAN. They are dangerous things unless your car just sits there and looks pretty. I will check with a friend who was an engineer at the factory where these were made, but to be honest, I don't remember if these were painted or powder coated as we did both paint systems. They WERE baked regardless.

BUT as this IS a FLEX FAN DO NOT sandblast it. The blasting could damage the integrity of the spring steel, causing it to break.......... and take your head off. That is fact not fiction!

If I were you my friend, I'd chuck it were it can never  be used again and buy a 4 blade solid fan as on a 71 for instance. If YOUR car is a concours trailer queen, then OK I get it, but a 40+ year old flex fan, I would never trust it at anything above idle and certainly not at high rpms. These are unexploded bombs and you will never know when it's about to blow. They should never have been allowed in the first place. I've seen what happens when a flex fan blade explodes and berries itself in 4" of oak in a test chamber.

If you must repaint it get it professionally chemically dipped if home solutions don't work.

 

Is the typical 73 fan one of these "flex fans" ?  Can I tell by just looking at it ? I never even gave any thought to this being a liability.

73 ragtop, 1999 Mustang Bright Atlantic Blue Paint, Phoenix Engine 302-335HP,  Edelbrock Carb & Performer manifold; c4 with 2000 stall and shiftkit; 3:55 auburn limited slip differential, Hedman shorties; Car Chemistry Exhaust

 

Classic Air; Tilt Steering Wheel; 1999 Chrysler Sebring bucket Seats ; power windows;

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OK, first off this is a FLEX FAN. They are dangerous things unless your car just sits there and looks pretty. I will check with a friend who was an engineer at the factory where these were made, but to be honest, I don't remember if these were painted or powder coated as we did both paint systems. They WERE baked regardless.

BUT as this IS a FLEX FAN DO NOT sandblast it. The blasting could damage the integrity of the spring steel, causing it to break.......... and take your head off. That is fact not fiction!

If I were you my friend, I'd chuck it were it can never  be used again and buy a 4 blade solid fan as on a 71 for instance. If YOUR car is a concours trailer queen, then OK I get it, but a 40+ year old flex fan, I would never trust it at anything above idle and certainly not at high rpms. These are unexploded bombs and you will never know when it's about to blow. They should never have been allowed in the first place. I've seen what happens when a flex fan blade explodes and berries itself in 4" of oak in a test chamber.

If you must repaint it get it professionally chemically dipped if home solutions don't work.

 

Is the typical 73 fan one of these "flex fans" ?  Can I tell by just looking at it ? I never even gave any thought to this being a liability.

 

 I'm not sure what years they were on mustangs, but possibly. The fan Helicopter is showing is a 5 blade flex fan. It has flexible blade riveted on to the "spider" as can be seem.

I'm amending my above post.

Geoff.

 I learn something new every day!

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OK, first off this is a FLEX FAN. They are dangerous things unless your car just sits there and looks pretty. I will check with a friend who was an engineer at the factory where these were made, but to be honest, I don't remember if these were painted or powder coated as we did both paint systems. They WERE baked regardless.

BUT as this IS a FLEX FAN DO NOT sandblast it. The blasting could damage the integrity of the spring steel, causing it to break.......... and take your head off. That is fact not fiction!

If I were you my friend, I'd chuck it were it can never  be used again and buy a 4 blade solid fan as on a 71 for instance. If YOUR car is a concours trailer queen, then OK I get it, but a 40+ year old flex fan, I would never trust it at anything above idle and certainly not at high rpms. These are unexploded bombs and you will never know when it's about to blow. They should never have been allowed in the first place. I've seen what happens when a flex fan blade explodes and berries itself in 4" of oak in a test chamber.

If you must repaint it get it professionally chemically dipped if home solutions don't work.

 

EDIT NOTE: While in the shower, it came to me that the flex fan blades were NOT painted at all, just the spider. Thinking back 40 years is getting tougher by the day!!

I would have think that the fan Helicopter has, HAS been repainted, but the above applies. I've not heard back from my engineer buddy who, while not working in the FAN department, has better knowledge of the production methods. I'll update when I hear form him.

 

Excellent !!!    You know your stuff.   Yes, maybe I should consider a '71 fan.  TNX

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Helicopter, hope you had a Merry Christmas and look forward to a safe Happy New Year and another great year here!

I'm going to post a link to a thread from August where we discussed the flex fans. Please read the entire thread. It contains a lot of info on the original numbers, the defective replacement numbers, and what replacements were safe to use. Unless your car is going to be a "Show Queen", I would even consider a fan/clutch set up which was also discussed. I would be concerned about doing much in the way of "Maintenance" on these flex fan blades. As Geoff stated the blades must be treated carefully so as not to alter their balance, the integrity of the blade material or the critical area where they attach to the hub. I'm presently out of town for the Christmas Holidays until January 3rd so I don't have access to any of my Ford reference material, but if you have any questions don't hesitate to ask. There are a lot of knowledgeable folks here.  

https://www.7173mustangs.com/thread-correct-fan-blade-for-1973-351c-4v

Steve

 

No Officer...I really don't know how fast I was going, my speedometer stopped at 140!

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OK, first off this is a FLEX FAN. They are dangerous things unless your car just sits there and looks pretty. I will check with a friend who was an engineer at the factory where these were made, but to be honest, I don't remember if these were painted or powder coated as we did both paint systems. They WERE baked regardless.

BUT as this IS a FLEX FAN DO NOT sandblast it. The blasting could damage the integrity of the spring steel, causing it to break.......... and take your head off. That is fact not fiction!

If I were you my friend, I'd chuck it were it can never  be used again and buy a 4 blade solid fan as on a 71 for instance. If YOUR car is a concours trailer queen, then OK I get it, but a 40+ year old flex fan, I would never trust it at anything above idle and certainly not at high rpms. These are unexploded bombs and you will never know when it's about to blow. They should never have been allowed in the first place. I've seen what happens when a flex fan blade explodes and berries itself in 4" of oak in a test chamber.

If you must repaint it get it professionally chemically dipped if home solutions don't work.

 

EDIT NOTE: While in the shower, it came to me that the flex fan blades were NOT painted at all, just the spider. Thinking back 40 years is getting tougher by the day!!

I would have think that the fan Helicopter has, HAS been repainted, but the above applies. I've not heard back from my engineer buddy who, while not working in the FAN department, has better knowledge of the production methods. I'll update when I hear form him.

 

Excellent !!!    You know your stuff.   Yes, maybe I should consider a '71 fan.  TNX

 

 I just got an email from my buddy and he confirmed that flex fan blades were NOT painted. If someone did paint or powder coat your fan, it will have made it a possible time bomb. CHUCK IT as far as you can throw it, better yet cut it up. Please do not be tempted to buy one of those cheapo aluminum flex fans either. Do I need to explain why?

Hope that helps and I didn't mean to scare the cr*pp out of you.

Geoff.

Geoff.

 I learn something new every day!

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So now I'm paranoid about my fan blowing apart going down the interstate and looking for a replacement. Any recommendations for electric fans that are easy fit. I do not have the fan shroud installed.

73 ragtop, 1999 Mustang Bright Atlantic Blue Paint, Phoenix Engine 302-335HP,  Edelbrock Carb & Performer manifold; c4 with 2000 stall and shiftkit; 3:55 auburn limited slip differential, Hedman shorties; Car Chemistry Exhaust

 

Classic Air; Tilt Steering Wheel; 1999 Chrysler Sebring bucket Seats ; power windows;

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So now I'm paranoid about my fan blowing apart going down the interstate and looking for a replacement. Any recommendations for electric fans that are easy fit. I do not have the fan shroud installed.

 

+1. Does a 71 fan blade bolt right up? or what about aftermarket clutch set ups mentioned earlier? Anyone know of a good source?

73 Grande H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

 

- Jason

 

 

082-hot-rod-power-tour-2017-1970-1970s.jpg

 

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Helicopter, hope you had a Merry Christmas and look forward a safe Happy New Year and another great year here!

I'm going to post a link to a thread from August where we discussed the flex fans. Please read the entire thread. It contains a lot of info on the original numbers, the defective replacement numbers, and what replacements were safe to use. Unless your car is going to be a "Show Queen", I would even consider a fan/clutch set up which was also discussed. I would be concerned about doing much in the way of "Maintenance" on these flex fan blades. As Geoff stated the blades must be treated carefully so as not to alter their balance, the integrity of the blade material or the critical area where they attach to the hub. There are a lot of knowledgeable folks here.  

https://www.7173mustangs.com/thread-correct-fan-blade-for-1973-351c-4v

 

Glad you posted the link to the time to read AND FOUND THIS TOO ! https://www.upi.com/Archives/1980/11/07/Ford-Motor-Co-officials-say-the-automaker-is-recalling/5299342421200/

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Helicopter, hope you had a Merry Christmas and look forward a safe Happy New Year and another great year here!

I'm going to post a link to a thread from August where we discussed the flex fans. Please read the entire thread. It contains a lot of info on the original numbers, the defective replacement numbers, and what replacements were safe to use. Unless your car is going to be a "Show Queen", I would even consider a fan/clutch set up which was also discussed. I would be concerned about doing much in the way of "Maintenance" on these flex fan blades. As Geoff stated the blades must be treated carefully so as not to alter their balance, the integrity of the blade material or the critical area where they attach to the hub. There are a lot of knowledgeable folks here.  

https://www.7173mustangs.com/thread-correct-fan-blade-for-1973-351c-4v

 

Glad you posted the link to the time to read AND FOUND THIS TOO !   https://www.upi.com/Archives/1980/11/07/Ford-Motor-Co-officials-say-the-automaker-is-recalling/5299342421200/

 

 Mark, glad you found that info. If that doesn't show good reason NEVER to put one of those damn things on your car, nothing will. Yes. it may be correct for your car, but if you don't have a concour trailer queen, why risk it. The link that Steve put up and comments from myself, refer to HARMONICS and that is a critical factor.

I urge ALL members to research this for themselves and beware and be safe.

Geoff.

 I learn something new every day!

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Helicopter, hope you had a Merry Christmas and look forward a safe Happy New Year and another great year here!

I'm going to post a link to a thread from August where we discussed the flex fans. Please read the entire thread. It contains a lot of info on the original numbers, the defective replacement numbers, and what replacements were safe to use. Unless your car is going to be a "Show Queen", I would even consider a fan/clutch set up which was also discussed. I would be concerned about doing much in the way of "Maintenance" on these flex fan blades. As Geoff stated the blades must be treated carefully so as not to alter their balance, the integrity of the blade material or the critical area where they attach to the hub. There are a lot of knowledgeable folks here.  

https://www.7173mustangs.com/thread-correct-fan-blade-for-1973-351c-4v

 

Glad you posted the link to the time to read AND FOUND THIS TOO !   https://www.upi.com/Archives/1980/11/07/Ford-Motor-Co-officials-say-the-automaker-is-recalling/5299342421200/

 

 Mark, glad you found that info. If that doesn't show good reason NEVER to put one of those damn things on your car, nothing will. Yes. it may be correct for your car, but if you don't have a concour trailer queen, why risk it. The link that Steve put up and comments from myself, refer to HARMONICS and that is a critical factor.

I urge ALL members to research this for themselves and beware and be safe.

 

I will be very careful - as I did use a D0OA 5 blade on the Boss (date coded for the engine)   GOing to take a look at it - it's funny though I don't drive any of my cars .....I did plan on driving the R code next year.   Maybe while it is being striped I will take apart and get a good look.

 

Happy New Year

Mark

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26f68b58ec36c3809f3faa11d78f75ea.jpg

 

Well crap... back to being paranoid. This is fan off of my 71 Mach 1, 351C, 2v. I was getting myself too stressed on this restoration and decided to have some fun with fan paint scheme.

 

I didn’t strip old paint. I gently wet-sanded it with 600 grit under warm water in kitchen sink. Wife was ecstatic! And then I spray painted with super light coats of engine cast coat and ford blue. Inspected all the edges, rivets, hub. Saw no visible signs for concern.

 

Is this fan ok to use, or what should I do? Humble apologies for hijacking this thread... But this clearly is a major safety concern, and this mustang community is top notch at looking out for each other!

 

 

Sent from my iPhone using Tapatalk

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sciabola13, there was never a problem with the DOAE-A or D1AE-CA five blade fans. The 7 blade fans that were fracturing were first production installed on the 72 Torino/Montego line and were later phased in on other car lines. The 7 blade fan was replaced by a series of 5 blade fans as I posted with the ID numbers in the  August thread. They were eventually all replaced by the D9AZ-8600-A (D9AE-EA) which was also used in production through 91 on the Crown Victoria and was a trouble free fan. Hemikiller also had some good suggestions and part numbers for a fan/clutch setup.

Steve

 

No Officer...I really don't know how fast I was going, my speedometer stopped at 140!

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Ok so now I'm thoroughly confused, we have 1 member that seems to have worked in the manufacture of this type of fan that says it should never have been used and its a death trap, don't use it, never use it, and so on and so forth, and another that says wait no, the deathtraps were only this model and that model. So whats the deal, do I need to just do a close model check and if its not listed its not a hazard or is this really a wow.......almost 50 years and that thing didn't fly apart............. huh............... kinda thing.

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libram, I understand your concern. Whether flex, fixed or clutch type fan, all fan designs are susceptible to damage. Tip speed of the blades, road debris, normal wear and tear, metal fatigue, etc all add to the problem. You may need to read the August thread referenced earlier in this thread. I'll repeat,there was NEVER any problem with the original DOAE-A  or D1AE-CA fans. From what I was told, Ford was trying to increase air flow through the cross flow radiators, With the cut in compression in 72, engines being tuned leaner, the 73's with the EGR system, the load on the cooling system was extreme. Unfortunately while the 7 blade fan looked good on paper, there was design and manufacturing flaws that surfaced once these fans were in the "Field". Don't recall what the failure percentage was, but a lot of these fans are still in service today with no problem. The D9AZ-8600-A (D9AE-EA) replaced ALL previous edition 5 and 7 blade flex fans and WAS trouble free. It was used on the 79-91 Crown Police Interceptor. I knew the shop managers for the State, County and City maintenance shops and checked with them regularly. They never had any fan failures with this fan vs the fans used on the previous 73-78 model

If you are not concours level showing your car and you are still concerned, look at the fan/clutch option or even the electric fan. Many forum members here have gone that route. But.....with ANY fan, it's just good maintenance while changing your oil or just poking around under the hood to check your fan for cracks, loose blades, or even where some road debris has hit one of the blades.

Hope this has helped some and not worried you further!     :)

Steve

 

No Officer...I really don't know how fast I was going, my speedometer stopped at 140!

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Helicopter, hope you had a Merry Christmas and look forward to a safe Happy New Year and another great year here!

I'm going to post a link to a thread from August where we discussed the flex fans. Please read the entire thread. It contains a lot of info on the original numbers, the defective replacement numbers, and what replacements were safe to use. Unless your car is going to be a "Show Queen", I would even consider a fan/clutch set up which was also discussed. I would be concerned about doing much in the way of "Maintenance" on these flex fan blades. As Geoff stated the blades must be treated carefully so as not to alter their balance, the integrity of the blade material or the critical area where they attach to the hub. I'm presently out of town for the Christmas Holidays until January 3rd so I don't have access to any of my Ford reference material, but if you have any questions don't hesitate to ask. There are a lot of knowledgeable folks here.  

https://www.7173mustangs.com/thread-correct-fan-blade-for-1973-351c-4v

Thanks a bunch.  This bloody fan has been a total pain in the neck.

I did manage to strip, sand, stip, sand, wire bruck, sand.  and got it fairly clean but I may go with the replacement fan.

I would feel a lot safer.

Roy

SAM_0361.jpg

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Well done Roy, you got it cleaned so now you have a nice piece of wall-art for your shop. Not intending to be sarcastic, but for reasons mentioned many times, I would not attempt to use it.

Steve refers to a previous post. In it, re-read his post #9 and my post 12 and 14. In 14 I mention harmonics. These fans were designed for a specific engine and it's specific harmonics, which is why one should never just go get one from the junk yard that "looks like it'll work".

I have not been able thus far, to contact the engineer who's job was preparing data for evidence in law suits back in the 70's. I'd still like to talk to him for my own interest at least.

All I can confidently say is this; BE WARNED!!

Geoff.

Geoff.

 I learn something new every day!

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Doing a copy and paste from the linked thread.

 

Gotta agree here, the flex fans are best left on the shelf if you drive your car at all. Besides the potential failure issue at high rpms, the noise drives me bonkers. The four blader isn't much better.

 

My solution was a thermostatic clutch fan. The clutch you need IIRC is the Hayden 2710. The fan blade can be off of anything that fits in your shroud and matches the clutch. You can buy a new Hayden 18" 3618 fan blade at RockAuto for about $35.

 

--- I've been running clutch fans for over twenty years on my performance vehicles. Buy a good quality thermostatic clutch like a Hayden and you're good to go. The clutch fan only loads the engine when it needs to pull more air, so you get the bonus of freeing up HP -and- and MPG increase. In my old daily driver 71 Cougar, it was worth 3 mpg over the factory flex fan.

 

Here's the links to the parts I recommend from Rock auto

 

Thermostatic fan clutch:   http://www.rockauto.com/en/moreinfo.php?pk=1793512&jsn=260

 

Fan blade: http://www.rockauto.com/en/moreinfo.php?pk=1793644&jsn=403

 

Stud kit: http://www.rockauto.com/en/moreinfo.php?pk=616253&jsn=496

 

 

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