Geoff359 Posted January 27, 2010 Report Share Posted January 27, 2010 I'm about to rebuild my engine and fit the lip type oil seal. The scrolls have been ground off the crank, but the fitting instructions indicate that 2 oil drain holes (in addition to the one thats already there) are drilled in the rear main bearing cap, presumably to aid the drainage of the oil and to prevent too much build up against the new seal. Does anyone have any thoughts or experience on this? Do I risk weakening the bearing cap? Are the holes really necessary? Any advice based on the fitting of these seals would be really useful! Geoff Masterman Quote Link to post Share on other sites
Ian Vincent Posted January 27, 2010 Report Share Posted January 27, 2010 Geoff, I am fairly sure that there is a post somewhere else on the forum by someone who did as you suggest and installed the split type seal without drilling the bearing cap and the seal leaked. I did drill mine and it wasn't too big a deal, the cap is cast iron and drills fairly easily and to get the right alignment I pushed a piece of wooden dowel into the existing center hole to give me a guide to follow. And start with a small pilot hole first, then you have scope to change direction slightly as you open it out if you come out in the wrong place on the other side. Rgds Ian Quote Link to post Share on other sites
stuart Posted January 27, 2010 Report Share Posted January 27, 2010 Ian you were right it was in the 2/3 forum a couple of months ago. Crank oil seal Stuart Quote Link to post Share on other sites
Geoff359 Posted January 28, 2010 Author Report Share Posted January 28, 2010 Thanks for your input, gents. I decided to let my local engineering company do the drilling as it seemed a bit hit and miss to get the angles right with a pistol drill! Geoff Masterman Quote Link to post Share on other sites
JJC Posted January 28, 2010 Report Share Posted January 28, 2010 [Geoff - I posted the same question a few months ago when I was at about the same point as you. I too opted to get the holes drilled (at disappointingly high expense) because I found an article somewhere from someone who didn't drill the holes and consequently got a leak. The engineering firm I used whose views I would respect said it would make no difference to the end cap strength. When it came back the holes looked pretty small compared with the cap so I am reasonably happy. Just annoyed they didn't do it when they ground off the scroll on the crankshaft. Good luck. JJC Quote Link to post Share on other sites
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