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Westerbeke W30 (4-91) rear oil leak
I have a fairly significant rear oil leak in my W30 engine. This is a slightly newer version of the 4-91. The motor starts promptly even without glowplugs (in Florida) and the crankcase breather is not clogged. My working diagnosis was a leaking rear seal. As Westerbeke no longer carries this part, I ordered one for a Leyland 4/25 tractor which has the same engine, but it has not arrived yet.
I have disassembled the back end- reduction gear/bellhousing/flywheel and backplate. I was initially expecting to find a lip type seal in a carrier based on the Westerbeke parts diagram, but I have the older round style rear plate and the parts book does not show a seal anywhere. I have also looked at the Austin FX3 (London Taxi) parts diagram and the Nash Metropolitan (same block) parts diagrams and don't see where the seal is. I am not able to identify a seal on the crank by looking at it. I believe I am looking at the back of the rear main bearing at the back of the crankcase.
Anyone familiar with this engine?
1979 Bristol 35.5