JJC Posted September 23, 2009 Report Share Posted September 23, 2009 does anyone have experience of the lip type oil seal conversion, specifically the extra drain holes in the end cap? Looks like a lot of extra holes to drill in the cap, would welcome views from those who have fitted the conversion. JJC Quote Link to post Share on other sites
pfenlon Posted September 23, 2009 Report Share Posted September 23, 2009 does anyone have experience of the lip type oil seal conversion, specifically the extra drain holes in the end cap? Looks like a lot of extra holes to drill in the cap, would welcome views from those who have fitted the conversion. JJC Its pretty straightforward to a local machine shop, locate one who has done this before, holes are easy for them. it is a worthwhile mod too. Quote Link to post Share on other sites
JJC Posted September 24, 2009 Author Report Share Posted September 24, 2009 Its pretty straightforward to a local machine shop, locate one who has done this before, holes are easy for them. it is a worthwhile mod too. Thanks for your reply. Yes, agreed it's straightforward given the right vice and machine, but I was after experience with regards to the subsequent strength of the bearing cap. Just looking to be absolutely certain there's no danger of weakening it! I'm just very very cautious not being an engineer. There must be hundreds of these conversions out there, I was hoping for a few responses saying worked fine for thousands of miles. JJC Quote Link to post Share on other sites
stuart Posted September 24, 2009 Report Share Posted September 24, 2009 Thanks for your reply. Yes, agreed it's straightforward given the right vice and machine, but I was after experience with regards to the subsequent strength of the bearing cap. Just looking to be absolutely certain there's no danger of weakening it! I'm just very very cautious not being an engineer. There must be hundreds of these conversions out there, I was hoping for a few responses saying worked fine for thousands of miles. JJC One of my customers has it on his 2 and 16000 plus miles on no problems. Stuart Quote Link to post Share on other sites
Dave Herrod Posted September 29, 2009 Report Share Posted September 29, 2009 I am about to start an engine rebuild to include the oil seal conversion. Please could someone expand on the issue of drilling the end cap as I wasn't aware that it was required. Thanks Dave Quote Link to post Share on other sites
Don Elliott Posted September 29, 2009 Report Share Posted September 29, 2009 I removed the crankshaft from my 1958 TR3A in May 2000. I bought the new modern seal kit from Ken Gillanders in California but it came from Darryl Uprichard at Racestorations in UK. I followed the instructions after having the crank ground for the diameter of the new seal and while it was out, I also had the journals re-ground. I didn't have to drill any extra holes in the rear cap assembly for the new seal. From 2000 to 2007, I drove my TR 51,000 miles and in 2007, decided it needed a ring job to cut down on the "blow-by" and reduce my oil drippage from the crankcase vent. But I had no issues with the modern rear seal. In 2007, I also changed the big end and con-rod bushing inserts while the engine was out and all apart and put in a new replacement rubber seal for the rear of the crankshaft. In the past two summers, I've driven a bit more than 8,000 miles and never had to add (top up) oil between oil changes. I'm using Castrol 10W30 and a 4 oz, bottle of ZDDP PLus for the flat tappets with modern oils each oil change. I never had an issue with the rear seal assembly as it came from Racestorations. Quote Link to post Share on other sites
JJC Posted September 29, 2009 Author Report Share Posted September 29, 2009 I wonder if it's the same as the one from Moss? Their instructions definitely include drilling extra holes. They must have sold loads so I might call them and check. I've sent my end cap back to the machine shop for them to see what they think. I'll let you know what they say. JJC Quote Link to post Share on other sites
Don Elliott Posted September 29, 2009 Report Share Posted September 29, 2009 Check with others who supply this kit. Ask Racestorations who made mine. Quote Link to post Share on other sites
JJC Posted September 30, 2009 Author Report Share Posted September 30, 2009 The machine shop I use have just come back. They say it's not obvious why the extra holes are needed but they are happy to drill the end cap. So assuming the original designer saw a problem with too much oil at the seal I've decided to go ahead and get the holes drilled. Unable to get through to Moss technical for their input. Quote Link to post Share on other sites
TR 2100 Posted September 30, 2009 Report Share Posted September 30, 2009 I haven't seen any comments before about drilling extra holes, but I do recall previous threads (some time ago now, like one year or more) highlighting some problems with exactly what diameter to machine the crankshaft for the seal. There haven't been any threads on the subject for quite some time, so maybe the problem has been resolved. AlanR Quote Link to post Share on other sites
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