Good evening all,
Having completely stripped my 47 M20 engine I’m wondering what exactly keeps the oil from leaking out of the crankcase, in particular the drive side? I can see the oil flinger on the crank, is it simply a combination of this and breather that keeps oil in?
Thanks,Gino.
You can replace the outer drive side bearing (6205) with a 6205 2RS to help prevent leaks..(2RS refers to 2 rubber seals so it's a sealed bearing)... Remove the seal that faces in towards the crank before fitting...It can easily be prised out with a small screwdriver or similar...
6205 2RS is a metric bearing so readily available from any industrial bearing supplier...Ask for a 'branded' bearing such as SKF, not the cheapo Chinese or Indian variants...Also get a 'C3' fit if they have it, though this is desirable rather than essential...
C3 refers to the internal clearances of the bearing, NOT its outer dimensions...I also replace the single use clip that retains the bearing into the crank case with a modern type circlip with 'eyes'...That makes removal and replacement a lot easier...Ian
I fitted the crankcases together this evening after installing all the crankcase bearings. I took Ian’s advice and a installed a single shield outer bearing on the drive end. Additionally, I reinstalled the shield that was in there originally. The thing is, I’m struggling to see how the shield operated. It’s not a close fit on the crank nor its housing. Currently it turns with the crank but can be stopped with very little pressure from a screwdriver. (The outer bearing is pressed well and truly home).
Is this how it’s supposed to be?
Many thanks for any advice as always,
G.
