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Not what you are thinking guys. 

Recently, most will have read that I had the rear axle out over winter for a rebuild and add a Traction-Loc diff. While the axle was out, it got a total clean up and repaint. Not surprisingly, there was a 'new paint' smell, or so I thought, but it still persists after a couple of months driving. Now, I have a poor sense of smell which means I can't really tell what I am smelling or where it's coming from ( I know I'm opening a can of worms here but....). So yesterday, I took my daughter for a drive to get gas and take the long ay home carving through some bends on a favorite road. When we got home, I could smell that 'paint smell' so I asked my daughter to see if she could locate it. Definitely the rear end, but NOT paint. I used an infra-red thermometer on the diff. and brakes but all were not that hot. Then she said it smelled like old oil, not paint. Then it dawned on me what I was smelling. The Ford friction modifier stinks to high heaven and that, along with the new Hypoid gear oil, was venting from the axle vent tube under the car. Hoping that goes away soon.

Has anyone else noticed this issue?

Edited by Stanglover

Geoff.

 I learn something new every day!

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it's easy to damage the new seals when installing the axle shaft, especially if the seal and splines aren't lubed and if the seals are used to support the axle shaft when inserting. And, they aren't i

Ford came out in 62 with self adjusting brakes.  I worked at my Dad’s shop after school and the first time I pulled the drums on a  62 Ford I wondered if I would ever be able to get it right, we had a

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Where does the axle vent go?

Maybe its in a spot where the pressure is higher and the pressure differential in the cabin is pulling the fumes in.

 

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It's not smelling in the cabin. I notice it after a run when everything is hot and on the outside. The vent tube goes where it's supposed to tucked into the frame rail and held by original bracket. 

The only smell in the cabin would be my rear end!!

Geoff.

 I learn something new every day!

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Have you checked the gaskets and seals for any leaks or seepage? I don't believe I ever smelled it that much from the vent, even after running a vehicle hard. I have smelled it though from even some small seepage around gaskets or seals. The axle seals are good suspects, due to the increased heat from the brakes, and they have to seep a lot before it becomes noticeable.

 

 

“If you can't explain it simply, you don't understand it well enough.”

--Albert Einstein

 

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Yes Don I have. All is good, no leaks on the diff anyway. I do need to pull the back wheels to check my brake work, so I'll be sure to look at the axle seals. It definitely has that horrible smell of friction modifier. The Ford dealer guy warned me not to get any of that on my clothes or hands because of the smell. By the way it is only after a drive that I smell it, but it goes away after it cools down. I'll also call my rear end guy and see what he has to say. I've only had this after the axle rebuild.

Geoff.

 I learn something new every day!

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How much did you elect to use? I think most often its 3oz modifier per quart of gear oil. I think the bottle is 4oz so some people put in the whole bottle. Although even one drop stinks tremendously. I've used it plenty of times back when I had my SN95 Mustang, but have never had that smell after everything was sealed up. 

Chris - BIG RED MACH 1

Born in '73 - Drive a '73

Former U.S. Army 63B10-H8

1st Infantry Division - The Big Red One

 

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I would say it almost HAS TO be a leaky axle seal in the rear brake drum, if there's no visual at the pumpkin. I'm with you about the smell. That Motorcraft friction modifier is what most all rear end shops say is the best....but Whoo-Boy! Like a skunk, once you get a whif o' that funky stuff, you won't forget it. If I just take an un-opened bottle out of my chemical cabinet in the garage, my wife says she can smell it without even coming in the garage.

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10 hours ago, Stanglover said:

Yes Don I have. All is good, no leaks on the diff anyway. I do need to pull the back wheels to check my brake work, so I'll be sure to look at the axle seals. It definitely has that horrible smell of friction modifier. The Ford dealer guy warned me not to get any of that on my clothes or hands because of the smell. By the way it is only after a drive that I smell it, but it goes away after it cools down. I'll also call my rear end guy and see what he has to say. I've only had this after the axle rebuild.

Something that we just went through on my wife's car was when we installed the axles I bent one of the seals. So I ran to the local parts store and purchased a new replacement seal for a 9 inch small bearing rear end. Installed it with no issues blah blah blah, drove the car and had another issue that we had to pull the axles, too much gear. When we pulled the side with the new replacement seal as we loosened that axle, fluid immediately started leaking. Long story short I was sold the wrong seal as it did not fit the axle and I never thought to check it against the axle. But we had zero leaks on the ground but definitely had fluid going places it should not have been. We probably would have had some issues in the future. In what form I don't know just another point of view for you being you said you just replaced the axles.

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To answer Big Red, Spike and tnfastbk at one time, thank for your input. Ford called for 1 - 4oz bottle of stinky sh*t and that's what it got. My 'guy' also says the same. Today, I'll pull the rear wheels and check the axle seals. These were all replaced when the axle was rebuilt, but there may be a slim chance that my 'guy' f'd up and put the wrong seals in. If there is a leak, then I'll have to go see my 'guy' as it's on him to fix it imo.  Before I do pull the wheels, I'll take the car out and get it hot. That way I can crawl under and try to smell the vent tube and then pull the wheels. I hope to hell that if it is the axle seals, it has not f'd up my new brakes.

I'll get back to you all with an update later today. Again, thanks to all for your input.

 

Geoff.

 I learn something new every day!

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it's easy to damage the new seals when installing the axle shaft, especially if the seal and splines aren't lubed and if the seals are used to support the axle shaft when inserting. And, they aren't immune from the "new ain't necessarily good" syndrome.

Edited by Don C
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“If you can't explain it simply, you don't understand it well enough.”

--Albert Einstein

 

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2 minutes ago, Don C said:

it's easy to damage the new seals when installing the axle shaft, especially if the seal and splines aren't lubed and if the seals are used to support the axle shaft when inserting.

Yup. And they won't even look physically damaged sometimes, They'll just leak from being slightly out of round. Have also seen "perfect" cheapo seals leak too. I'd verify what ones they used to make sure they used quality seals.  

Chris - BIG RED MACH 1

Born in '73 - Drive a '73

Former U.S. Army 63B10-H8

1st Infantry Division - The Big Red One

 

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Thanks Don and Big Red, I just finished checking all the rear end over. There was no leaks from the left side axle seal, BUT there was slight leakage from the right seal, first pic.. The amount is just a trace and there was enough to wet the finger in the backer late lip. I don't know if this is enough to cause the "stinky rear end" syndrome or not. There are no leaks from the center section.

The pics show the vent tube location. The hole that the tube was in is not present on the right side. When I took it out, the clip for sure looked original. I do know that the center section had been out in the past, but that doesn't mean the axle was removed from the car. The rest are the left and right seal area. 

I will be taking the car out later so now I know where the possible areas of concern are, I'll be able to sniff out the spot.... if my nose will pick it up that is.

 

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Edited by Stanglover

Geoff.

 I learn something new every day!

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That's likely enough. Ever have a propane tank filled up? Even the small amount of odorant that escapes from the bleeder screw causes the tank to stink for hours.

There's a reason they add the odorants to various products, a warning that something is not right.

 

 

“If you can't explain it simply, you don't understand it well enough.”

--Albert Einstein

 

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1 hour ago, Don C said:

That's likely enough. Ever have a propane tank filled up? Even the small amount of odorant that escapes from the bleeder screw causes the tank to stink for hours.

There's a reason they add the odorants to various products, a warning that something is not right.

 I talked to my 'guy', Brad. Unfortunately he is not well again and unable at this time to look at it. He thinks that although he replaced the seals, I could have a worn axle shaft, but hard to tell just from a description. Now I know that there is a small leak,  I have decided not to overly worry about it, but keep my eye on it for the small amount of driving I'll be doing this year.  I don't want to get into doing a seal swop myself without proper tools. From reading my Ford manual, it can be tricky. Then again it is the Ford manual! 

I didn't get to take the car out today as company dropped by and that was that. For now, I'm confident what the smell is, just not totally sure where it's coming from. Thanks for your help, it's much appreciated.

 

Geoff.

 I learn something new every day!

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  • 5 months later...

Going through some of my old threads, I noticed I never closed this one off. Since the last update, I've been keeping an eye on that small leak from the right rear hub. When I was replacing the springs, I took the drum off and thankfully, the leak seems to have stopped. I will continue to monitor it, but I'm confident it is nothing to worry too much about. AND, the stink has stopped too!!

Geoff.

 I learn something new every day!

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51 minutes ago, Kenny nunez said:

I do not like to “nit pick”but your lower brake spring is not seated properly in the respective locating hole.  The whole hooked end has to be inside the hole in the brake shoe.

 Hmm, I don't think that's being nit-picky at all. To be honest, I really hate doing rear brakes, always have for some reason. I took pics of the old springs that were installed by a mechanic. I thought I'd got them the same. It's not the same angle, but below is a pic of the old spring install, opposite side though. Maybe the mechanic got them wrong, or I didn't copy exactly what he'd done. None the less, thanks for your input. I'll have to check them out, but that won't be till spring now. Because of the very slow seepage on that axle seal, I'll be checking that anyway. Do you or anybody else have good accurate pictures of how that spring ought to be?

Wait a minute! Did get that spring backwards? I think it might be, but just on the one side. The other pic looks ok..... I think.

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Edited by Stanglover
Added second pic and comment.

Geoff.

 I learn something new every day!

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5 minutes ago, Kenny nunez said:

The slightly blurry picture is correct.  All you need to correct yours is a good pair of pliers or vice grips to grab and pull the spring.

 All I can say is "good eye". Thanks for spotting that error on my part. For sure it will get swapped around when the car is out of storage in Spring. Here's the other side, which looks correct.

Thanks Kenny.

IMG_1453.JPG

Geoff.

 I learn something new every day!

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Ford came out in 62 with self adjusting brakes.  I worked at my Dad’s shop after school and the first time I pulled the drums on a  62 Ford I wondered if I would ever be able to get it right, we had an old Cajun guy who worked for us and he bailed me out, and many times on other things.

I just did a complete brake job on my 71 and I can still hear that old guy advising me in my head.

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1 hour ago, Carolina_Mountain_Mustangs said:

Isn't there a little plate between the ebrake arm and the oval spring?

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David, that's a good point. There weren't any on either side. I will check the rebuild kit as there may be those plates you show. I had not previously done the rear brakes from when I bought the car. It wasn't until I pulled the axle for the rebuild that I ever touch them other than to inspect for wear. Mine is a 71 of course, could that have been a change over the span of the 71-73's? 

Here's a pic of the brakes from before I pulled them apart. If there should be those little plates, I'll have to correct that in the spring.

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Geoff.

 I learn something new every day!

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I do not have the Ford manuals for the 71 so I cannot go look. Everyone I have ever worked on had them in the past.
I went to CJ Pony and they say 65 - 73 same. True or not I do not know, lol. https://www.cjponyparts.com/ford-parking-brake-shoe-link-spring-retainer-10-rear-drum-pair-1965-1973/p/HW1247/

Edited by Carolina_Mountain_Mustangs
Add link to parts, https://www.cjponyparts.com/ford-parking-brake-shoe-link-spring-retainer-10-rear-drum-pair-1965-1973/p/HW1247/

When a man is in the woods and talks and no women are there is he still wrong??:P

David

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2 hours ago, Carolina_Mountain_Mustangs said:

I do not have the Ford manuals for the 71 so I cannot go look. Everyone I have ever worked on had them in the past.
I went to CJ Pony and they say 65 - 73 same. True or not I do not know, lol. https://www.cjponyparts.com/ford-parking-brake-shoe-link-spring-retainer-10-rear-drum-pair-1965-1973/p/HW1247/

 David thank you so much for your input on this. In my 71 manual, it shows no such plate, just the spring. There is also no mention in the write up. It would make sense to have them, but I guess it was an engineering change between 71 and 72-73. The NPD catalog only shows the springs, no plates like the CJ Pony link. Curiously, NPD show for 65-72, 10" brakes, 2 spring are required but for 73, it shows 4. Hmm!.  Here is a jpg from the 71 manual.

Scan0001.jpg

Geoff.

 I learn something new every day!

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@Kenny nunez

Thank you for bringing that adjuster spring located wrong, to my attention. Not only is that one in backwards, it also looks like the springs sold in the kit may be wrong as well. My 71 Ford manual states that the first coil should be at the edge of the large hole in the leading shoe, which even on the correctly installed one, it is not. So, gents, it looks like I have a bit more work to do next spring. Pity I chucked all the old springs!

Again thanks to all for the interesting input.

Geoff.

 I learn something new every day!

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