RufusTheDufus
SILVER Star
amaurer, do you have a turbo on it?
Missing oil mystery?
- Thread starter amaurer
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- Thread starter
- #42
Nope. Stock
- Thread starter
- #44
No, I haven't. You're thinking maybe a leak in the vacuum pump? Does that happen?
If I recall correctly my vacuum lines head upward to the firewall before going down to the reservoir. I wonder if oil could really crawl up that line against a vacuum...??
I'll check when I get home.
- Thread starter
- #45
Nothing in the vacuum tank.
RufusTheDufus
SILVER Star
I checked my vacuum tank tonight out of curiosity since I know my engine is tired. It's bone dry in there. I wouldn't think oil could end up making it to the vacuum tank.
- Thread starter
- #47
I've decided to replace the pan gasket and front main seal, and replace all the valve seals at the same time.
My symptoms don't make perfect sense; I should see a leak or I should see smoke, but that oil has to be going somewhere.
However, if I assume that I'm getting smoke whenever I smell something stinky (after decelleration or idle) and I'm just too dense to notice it, then the symptoms say valve seals are to blame. This makes just slightly more sense to me than assuming the oil rings are shot but compression is good, even though I know thats not impossible.
So thats the plan.
My symptoms don't make perfect sense; I should see a leak or I should see smoke, but that oil has to be going somewhere.
However, if I assume that I'm getting smoke whenever I smell something stinky (after decelleration or idle) and I'm just too dense to notice it, then the symptoms say valve seals are to blame. This makes just slightly more sense to me than assuming the oil rings are shot but compression is good, even though I know thats not impossible.
So thats the plan.
Just wondering, when I checked my truck out for oil leaks with the last 3B (losts of blow by) the vac reservoir would have up to a litre of oil after 2 or 3 months??
This is where most of my lost oil had gone. Lots of oil on the front drive shaft and out of the side cover but most was ending up in the vac reservoir?
This is where most of my lost oil had gone. Lots of oil on the front drive shaft and out of the side cover but most was ending up in the vac reservoir?
Yes, it does happen or I would not have mentioned it in one of my earlier posts in this thread
Vacuum works well to suck the oil along the tubes....
There is a check valve in the alternator to prevent this, but it can go bad over time leading to oil in the reservoir.
~John
Explanation for oil in reservoir (since it may seem counter-intuitive):
Vacuum pump creates vacuum and is an oil-filled pump.
Vacuum is stored in the reservoir.
There's a check valve at the alternator - it's in the threaded fitting of the vacuum line at the top of the alternator.
Life is all good as long as the engine is running, but when the engine stops and the pump is no longer generating vacuum, a bad check valve can allow the oil to be drawn from the alt into the reservoir.
Voila.
It's not a commonly reported thing, but then I don't think too many people are checking, either.
Vacuum pump creates vacuum and is an oil-filled pump.
Vacuum is stored in the reservoir.
There's a check valve at the alternator - it's in the threaded fitting of the vacuum line at the top of the alternator.
Life is all good as long as the engine is running, but when the engine stops and the pump is no longer generating vacuum, a bad check valve can allow the oil to be drawn from the alt into the reservoir.
Voila.
It's not a commonly reported thing, but then I don't think too many people are checking, either.
crushers
post ho
holy crap, that makes sense...
nice post
nice post
