Light Oil in Exhaust

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Light Oil in Exhaust

Post by hackcampbell » Wed Sep 06, 2017 8:30 pm

My Pinz has what I assume to be a problem, though it may very well fall into "Yep, that's just how they are" territory.

I noticed in my garage the other day that I had a couple feet of a light spray pattern of what appeared to be oil. It only took me a second or two to realize it's right where the exhaust is where I park the truck.

I started the Pinz, and put my hand a few inches away from the exhaust. It took about 5 or 10 seconds, but a very fine mist of oil began collecting on my hand. It seemed to be pretty consistent, until it ever so slightly "burped", which resulted in a little extra oil, and continued to run just fine. It was mostly just a little hiccup int idle; very minor. I want to reiterate how little oil it actually was; it was a lot of barely visible dots. I didn't really have time to investigate it, so I don't know if it changes after the engine has warmed up.

I've put about 500 miles on it since I purchased it, and the oil level hasn't changed when checked. I assume it's either oil getting passed the valves or the piston rings. Does anyone else have a truck that does this? Does everybody else have a truck that does this? Is it indicative of a larger problem that needs addressed, or just "relax, don't worry, drive a Pinz"?
1974 Pinzgauer 710M

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Re: Light Oil in Exhaust

Post by pcolette » Wed Sep 06, 2017 8:43 pm

Both of mine used to do what you describe though I'm not sure how much was oil and how much was incompletely burned fuel. Ever since I installed the PinzSSI ignition on both, the amount of residue has significantly decreased. It's not gone but is tolerable. Just my 2 cents.
Paul C.
'73 Swiss 710M
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Re: Light Oil in Exhaust

Post by pinzinator » Wed Sep 06, 2017 9:40 pm

Mine spews the black oil out, too. It has done it since I bought the truck in 2003. I just make sure nothing important is near the exhaust when I start it.
I will put a rag over the exhaust and hold it in place with a magnet when I start it inside the garage with plans to leave it stationary. The rag catches the oil, rather than the wall. After a minute or so it clears up.

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Re: Light Oil in Exhaust

Post by rmel » Wed Sep 06, 2017 11:44 pm

The exhaust valves have no seals other than the fit of the valve stem.
The intakes do have a seal. When starting up cold, there will be some
minor oil leaking past the exhaust valve stem but should subside once
the engine is at normal operating temperature. If the leak persists then
your going to see some blue smoke as the entire exhaust headers get
above the flash point of motor Oil ~600F. No significant blue smoke no
leak to worry about.
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Re: Light Oil in Exhaust

Post by bbolander » Thu Sep 07, 2017 5:40 pm

I had the same thing until we rebuilt the carbs. They were running way rich and I was getting fuel in the oil.
1971 Pinzgauer 710M, all stock including 245-16 Maloya tires, taken off and stored for show
BFG MT KM2 265/75R16's on Black SAV replacement rims on now

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