I hadn't drive my car for a couple of weeks and started it the other day and had a flood of white smoke on start up, i drove it around the block and could hear some faint popping from the exhaust. I recently swapped intakes and wondered if the intake wasn't sealed properly. I pulled it off and everything looked fine. I shined a flashlight in each intake runner on the head and found one with about a table spoon of oil on the valve. I guess that's my culprit. The popping makes me wonder if the valve is sticking? Should I just the pull the head at this point and look everything over or just replace a seal? It's a 383
Leaking valve seal
- Thread starter 69' Net
- Start date
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TrailBeast
AKA Mopars4us on Youtube
White “smoke” that dissipates within a few feet is coolant or condensation.
Blue smoke that drifts over to the neighbors house is oil.
I would suggest you take another real close look at the intake, especially down in the bottoms of the ports on the intake and heads both.
Oil can get pulled up out of the valley and puddle in the ports if you don’t have a good seal.
Blue smoke that drifts over to the neighbors house is oil.
I would suggest you take another real close look at the intake, especially down in the bottoms of the ports on the intake and heads both.
Oil can get pulled up out of the valley and puddle in the ports if you don’t have a good seal.
Inertia
Well-Known Member
Pull the spark plugs, if there is that much oil being burned, it'll show on the plugs unless they are newish.
It's unusual for any quantity like you mention to leak past a guide while the motor is at rest as the oil would have to climb up the guide to run down inside the guide, that'd have to be a very loose guide, and the head oil drains would have to be plugged to accumulate oil, which I have seen.
If you find a oily plug, there will likely be "ash" build up one one side, that side will face the bad guide, and yes, exhaust valves can suck oil with venturi vacuum .
We're it mine, - I'd replace the guide seals, tighten the intake manifold bolts, and cross my fingers .
Good luck.
P.S. don't be discouraged if it smokes for a while after seal replacement, the whole inside of the exhaust system will be coated in tar, and need to burn off.
Cheers
It's unusual for any quantity like you mention to leak past a guide while the motor is at rest as the oil would have to climb up the guide to run down inside the guide, that'd have to be a very loose guide, and the head oil drains would have to be plugged to accumulate oil, which I have seen.
If you find a oily plug, there will likely be "ash" build up one one side, that side will face the bad guide, and yes, exhaust valves can suck oil with venturi vacuum .
We're it mine, - I'd replace the guide seals, tighten the intake manifold bolts, and cross my fingers .
Good luck.
P.S. don't be discouraged if it smokes for a while after seal replacement, the whole inside of the exhaust system will be coated in tar, and need to burn off.
Cheers
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TrailBeast
AKA Mopars4us on Youtube
I don’t know, as having a stem seal go bad right after an intake swap is kind of suspect.
Inertia
Well-Known Member
I re-reread the post and agree, the intake should be suspect, he said looked fine, but yes, - int gskt seal should be scrutinized.
Re-seal intake and cross fingers .
The steam disappearing vs smoke is correct .
Any ash on plug would be on intake side regardless .
Thank-you .
I agree, which is why I pulled it off to look at it. The reason I didn't think it to be the issue was there was absolutely no oil residue inside the intake runner on the head. Just oil resting on the valve
Inertia
Well-Known Member
How is the pcv plumbed, to plenum or manifold bib ?
TrailBeast
AKA Mopars4us on Youtube
That may be only because you have very little reversion, or the fuel is washing down the runner.
Not saying it couldn’t possibly be a stem seal, just highly unlikely IMO.
That much oil running down the stem after shutdown just doesn’t make sense.
T
To the pcv port on the carb
Pcv is connected to carb. No oil in the manifold under the carb. I'll try and get a pic tonight
Yeah its possible. I just figured I would see something in there. It's bone dry
PRH
Well-Known Member
What type of seals are on the heads?
Then it's probably very light blue and not white. These are important details.
Well maybe I was off on the color. It's definitely not vapor though
Sometimes, it's a tough call on the color.
Update, I was to pull a valve spring off today to look things over. These are 452 heads and have the viton valve seals. All I have are the bag of long and short seals. Can I use one of these or should i wait and use the same seal?
PRH
Well-Known Member
Pics would be helpful.
Can you see that the seal is damaged?
Can you see that the seal is damaged?
Inertia
Well-Known Member
There's a little plastic protector to slide over the ridges of the valve when installing the new seals, - look for it/them .
Oh ok that makes sense. I'll see what I can find
Inertia
Well-Known Member
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