Oil dipstick o-ring or seal?

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tony-muscle

tony-muscle

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Location
Madison, WI
My Car
1971 Mach 1 w/408C stroker
Does the Cleveland dipstick have an o-ring or seal? Last Sunday while driving around the track I got some oil coming out of the dip stick. The dip stick was not "pushed" out or anything. It seemed to have leaked oil probably during heavy braking when the oil is pushed forward.
 
Last edited:
Well Tony, if you didn't put your car almost on its side while cornering, perhaps the oil wouldn't come out!!
Hey, just having some fun with you.
Honestly, I've never looked, but now I will for sure.

By the way, if you didn't read my PS hose blow off saga, the pump I got from you worked like a charm. I just had to assemble the canister and seal it all up. The one I had on the car had developed a small leak off the shaft main seal, so I benched that one to rebuild, now done, I have two good pumps.
 
tony-muscle said:
ok, I may have to look in there but I am almost sure I am missing it. Is there a supplier of these? Otherwise I just have to look for an oil resistant o-ring that fits there.
Click to expand...
It wouldn't hurt to fit one on the stick under the cap, but it would just be sitting on top of the tube as far as I can see on mine.
 
Tony, are you talking the dipstick tube to block, or the dipstick itself where it goes into the tube? Maybe some of us are getting confused, not hard at MY age!
There is no "O" ring in the cap part of the dipstick.

Another thought came to me and that is excessive crank case pressure. NOT being an engine guru, not even close, but is it possible that could be a cause for oil to "burp" out through the stick?
 
Stanglover said:
Tony, are you talking the dipstick tube to block, or the dipstick itself where it goes into the tube? Maybe some of us are getting confused, not hard at MY age!
There is no "O" ring in the cap part of the dipstick.

Another thought came to me and that is excessive crank case pressure. NOT being an engine guru, not even close, but is it possible that could be a cause for oil to "burp" out through the stick?
Click to expand...
Yes. I mean dipstick to tube.
It is not crankcase pressure because it only happened on track. Otherwise i can get the engine revving high with no issues. The other reason i dont think is crankcase pressure is that the dipstick was not pushed out. At some point in the past i was experimenting with breathers and the excessive crankcase pushed the dipstick up about an inch. That was not the case this time.
 
Ok, I went into the basement and whipped out my dip-stick. As far as I can tell there never was an o-ring seal like you would find on a more modern car. The w-bend at the top of the dip-stick are what retains it in the tube. I have had the tube completely out a couple of times during rebuilds and I do not recall any seal on the tube itself. I certainly used sealer when I installed the tube into the block and it never has leaked a drop. It was a long time ago so maybe I am wrong there actually being an o-ring.

Ron
 
tony-muscle said:
Does the Cleveland dipstick have an o-ring or seal? Last Sunday while driving around the track I got some oil coming out of the dip stick. The dip stick was not "pushed" out or anything. It seemed to have leaked oil probably during heavy braking when the oil is pushed forward.
Click to expand...
you need to vent the crank case, you have too much crankcase pressure.
if you have crankcase filters, on the valve covers, change them.
how much horsepower are you running? you may consider a positive vacuum from the crankcase.
 
tony-muscle said:
Yes. I mean dipstick to tube.
It is not crankcase pressure because it only happened on track. Otherwise i can get the engine revving high with no issues. The other reason i dont think is crankcase pressure is that the dipstick was not pushed out. At some point in the past i was experimenting with breathers and the excessive crankcase pushed the dipstick up about an inch. That was not the case this time.
Click to expand...
That's good to know Tony. Thanks for clarifying.
 
Rockin Ken said:
you need to vent the crank case, you have too much crankcase pressure.
if you have crankcase filters, on the valve covers, change them.
how much horsepower are you running? you may consider a positive vacuum from the crankcase.
Click to expand...
Tony clarified that it is not crank case over pressure.
 
Ron Tanzi said:
Ok, I went into the basement and whipped out my dip-stick. As far as I can tell there never was an o-ring seal like you would find on a more modern car. The w-bend at the top of the dip-stick are what retains it in the tube. I have had the tube completely out a couple of times during rebuilds and I do not recall any seal on the tube itself. I certainly used sealer when I installed the tube into the block and it never has leaked a drop. It was a long time ago so maybe I am wrong there actually being an o-ring.

Ron
Click to expand...
My dipstick doen't have that W bend. I may replace it by something like the Scott Drake D0ZZ-6750-K that has the bend and appears to have some type of rubber "cap", at least based on the picture.
1682602752274.png
 
tony-muscle said:
My dipstick doen't have that W bend. I may replace it by something like the Scott Drake D0ZZ-6750-K that has the bend and appears to have some type of rubber "cap", at least based on the picture.
View attachment 76068
Click to expand...
Is your dipstick original? Is there a For p# on it? Mine is a DOAE-6750-A. Mine is pretty secure in the tube and has never popped out.
 

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