Engine Leaks Oil Bigtime!!

[55 Fargo]

Hi all, noticed my engine is leaking a bit of oil, 6 inch pattern over a couple of weeks. Its coming from the back of the engine, will rear main seal leak when the engine is not running, or would this be more of an oil pan leak.

I have never taken the oil pan off this engine yet, it might be a good thing to remove and clean, also I want to pull the manifolds to fix the heat riser valve, would that be a good time to replace the valve cover gaskets, is it wise to clean up the valve galleys at that time too.

I will need to do something with this summer, the diff is leaking a slight bit out of the pinion seal too.......................fred

[JerseyHarold]

Have you checked the road draft tube and oil cap mesh for clogging? Might be built-up crankcase pressure forcing the oil out.

[greg g]

Well you probably want to get under and see if you can locate the source of the oil. It can be leaking at the front and dripping from the rear, or leaking from the valve covers and leaking from the rear also, as the fan and air flow will push it abound. The rear main can leak and look like it leaks while standing as whe it is running it flies up into the bell housing then drips down at reat.

Get under and clean it off, take it for a short slow drive and then take a look again.

[55 Fargo]

No that shouldn't be a problem they are both clean as a whistle