Oil Draining Into Sump

Had my 72 911E in the garage the last 3 months working on the front end. I am now getting ready to pull the engine to fix some leaks and put on some SSI's. Went to drain the oil from the tank and discovered all the oil had drained down into the sump! Is this normal, the car having not been run in 3 months? Is there some type of valve that has weakened allowing this to happen? Should I be concerned and if so, what can I fix?

Kurt V
72 911E

Kurt,

Are you familiar with the two relief valves, one on the left side of the crankcase, between the flywheel/bellhousing and the scavenge hard line fitting .... the other being on the right underside of the crankcase, more or less below the oil cooler? If you find both of those retaining plugs with large slotted screwdriver-type plugs ... get a large, slotted drive bit, 1/2" drive, not a smaller one, but one of the type called 'drag link bit or drive' and file/grind it down to fit those slots precisely. Remove the plugs with a long 1/2" drive breaker bar, and nothing else, except a six-inch extension for the lower right plug!

Once you have removed the plugs the spring and plunger should fall out or be easily removed. The springs should be 69.0-70.0 mm long. If they are not, get replacements (both are the same part) from a dealer, pn# 901.107.531.00! The plungers should not be rough or have any significant scratches to the touch anywhere on the cylindrical 'working' surface. If they do, get replacements, pn# 901.107.512.01.

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Warren Hall
1973 911S Targa

WArren,

Are you sure the pressure relief valves help prevent drainback into the sump? I guess they might. THe early 911's had holes in these valves though... Isn't this normal for a 3 month stand?

Make sure you order the proper pistons, the wrong ones could make things a big ugly on the oil pressure....

You can get them out okay, getting them back IN is the REAL fun...

[This message has been edited by cstreit (edited 02-13-2001).]

Chris,

I'm not certain there is a problem at all, but those springs and plungers are the ONLY direct path to the sump in the entire oil system! And, yes, I've had several sets out and back in to check the springs for aging. And, those are the correct part numbers from the '72-'73 parts catalog.

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Warren Hall
1973 911S Targa

Does the 87 Carrera have the same check valves?

Originally posted by Early_S_Man:
Kurt,

Are you familiar with the two relief valves, one on the left side of the crankcase, between the flywheel/bellhousing and the scavenge hard line fitting .... the other being on the right underside of the crankcase, more or less below the oil cooler? If you find both of those retaining plugs with large slotted screwdriver-type plugs ... get a large, slotted drive bit, 1/2" drive, not a smaller one, but one of the type called 'drag link bit or drive' and file/grind it down to fit those slots precisely. Remove the plugs with a long 1/2" drive breaker bar, and nothing else, except a six-inch extension for the lower right plug!

Once you have removed the plugs the spring and plunger should fall out or be easily removed. The springs should be 69.0-70.0 mm long. If they are not, get replacements (both are the same part) from a dealer, pn# 901.107.531.00! The plungers should not be rough or have any significant scratches to the touch anywhere on the cylindrical 'working' surface. If they do, get replacements, pn# 901.107.512.01.

Movin,

Yes, same functional valves, though one has a different 86 mm spring and guide, and both plungers are of a non-perforated, different style.

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Warren Hall
1973 911S Targa

Maybe this is why some 911's smoke upon start-up.

Originally posted by Early_S_Man:
Movin,

Yes, same functional valves, though one has a different 86 mm spring and guide, and both plungers are of a non-perforated, different style.