So I've owned # 1791 for a month and two week..and when I finally received it I placed plastic sheet on the garage floor to help identify and fluid leaks.

Several drops of oil on the floor appear to b coming from 3 holes at the bottom of the bell housing.

Can anyone explain0907191233


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There would be two likely sources. One is the rear seal on the crankshaft. The original was the "rope" type which literally is a rope made of fabric. Over time they will tend to dry out and drip oil.

The second place would be the rear gasket of the oil pan. It's just as likely to leak. It's the easier of the two to change. The crank seal you need to pull the transmission out and remove the clutch and flywheel and lower the oil pan.

When you do that one you should do the oil pan gaskets also.


There is a third possibility but low probability of the oil galley plugs leaking. Those are under the flywheel in the block and last but not least, the rear of the intake manifold could be leaking and running down the back of the block.


At some point you do need to address this since the leaking oil will get on the clutch itself. Some clutch materials are more resistant to the oil, others like organic linings won't tolerate the oil for ever.



There is also a ZF seal that seals trans lube from migrating into the bellhousing around the input shaft.  Ca you tell if the oil is heavy or light weight?


There is such a small amount on the floor that it is hard to tell.

Somehow it did not have the usual "Engine Oil" smell.

It is darker than the almost clear engine oil. 

I will check the next time I turn the engine over.

...I concur with All of the Above!! One Last cause for the 'Rear Main Seal' Leaking is...The Original 'Rope' Seal was Replaced with a Neoprene Seal, to do so requires removing the 'Sharp PIN', That WAS there to prevent the rope from rotating. AND the remaining 'Hole' was Never Sealed-Up, and Leaks! Most would fill, Only the Hole, with Silicone, RTV, before the Seal is Installed. MJ    

Last edited by marlinjack

The dust produced from the clutch disc as it wears is almost black. Any sort of liquid running through the bell mixing with it could produce what you describe, including water from condensation.

You can get condensation from any number of atmospheric conditions.

The only way you can tell for sure what the issue is, is to take the transmission out and carefully examine everything. You can actually run the engine with the transmission out That way you could observe any leaks while running.

The transmission needs to come out though to accurately diagnose any of this.

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