oil on top of the cylider
 

I have the injectors, glow plugs and prechambers out on a 84 300d. After doing the compression test I noticed that there was oil on top of the cylinder and a good bit of it. Any guesses?

Valve stem seals? Did the car smoke much at start up?

I just got the car and am checking it out

did you use the injector bores to test?

which 'cylinders' show oil? --(do you mean 'pistons'?)
#1 and #5 are candidates for typical oil leaks b/c of the headgasket.

What were the results of the compression test?

350 psi across the board

LOL, I don't want to insult you but if I had just done a compression test there would be oil on top of the piston. Because I would have checked it ' normally' and then with oil having been put between the piston and the bore... so some that did not get between the piston and the bore would be left over up on top of the piston...
Was this a trick question ? ( as asked in Ghost Busters by Bill Murray ) ....

Well as Tom Cruise would say, "negative ghost rider." Compression test was done dry. I did not put any oil in the cylinder. #1 and #5 both have a considerable amount of oil on the top of the cylinders. There is no reason to add oil to the cylinder during the compression test unless you have a cylinder that is low on compression then you add oil to see of the compression comes back up and if it does then you would need to think about piston rings.

I couldn't get the oil circuit photo to load large enough.

The circuit goes through a passage near the front of the engine to supply the head with oil and relies on the HG - it is under great pressure even when cranking for comp. test.

It does not explicitly show a passage in the rear, but that is where I had the most excessive oil leak and others have stated a leak there as well.

Also on the first piston, the thin separation b/w the timing cavity and the first piston are a common failure, but you would have seen a larger drop in compression on that cylinder.


SO if you want to stop the oil - you probably want a new Headgasket.