Rich8v Posted July 6, 2009 Share Posted July 6, 2009 I noticed that the new bearings i got from mr T have different size holes in them. The new ones are about halve the size of the old ones. Its the correct part supplied by toyota, so i am unsure what to do with them. Will they be ok to fit? Quote Link to comment Share on other sites More sharing options...
paul mac Posted July 6, 2009 Share Posted July 6, 2009 sounds perculiar mate but it might be ok, out of interest i just measured one of my old ones, its a number 3 bearing and the 2 oil slots measure 3.75mm x 14.75mm each, the centre oil groove measures 4.2mm Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 6, 2009 Share Posted July 6, 2009 Post photos of old and new top and bottom shell halves. Quote Link to comment Share on other sites More sharing options...
Rich8v Posted July 7, 2009 Author Share Posted July 7, 2009 Every dimension seems good apart from the size of the hole. Quote Link to comment Share on other sites More sharing options...
paul mac Posted July 7, 2009 Share Posted July 7, 2009 i,m lost my bearings look like these http://www.mkivsupra.net/vbb/showthread.php?t=171026&highlight=main+bearing is this an n/a or something Quote Link to comment Share on other sites More sharing options...
Scooter Posted July 7, 2009 Share Posted July 7, 2009 small hole ones are correct for the TT larger holes for an NA. So it would appear that your engine may have been rebuilt (has it?) previously with the wrong ones?...............either that or both the engines i dismantled had both been previously rebuilt with the wrong bearing type Quote Link to comment Share on other sites More sharing options...
jamesmark Posted July 7, 2009 Share Posted July 7, 2009 It was never rebuilt in my short ownership. It did go for some work @ Envy which included valve stem seals and Hybrids. (dunno how far down they bearing thingies are) Quote Link to comment Share on other sites More sharing options...
paul mac Posted July 7, 2009 Share Posted July 7, 2009 doh i thought we were talking about main bearing, sorry Quote Link to comment Share on other sites More sharing options...
Rich8v Posted July 8, 2009 Author Share Posted July 8, 2009 doh i thought we were talking about main bearing, sorry I mean the con rod bearings, but every one i have spoken to refers them as big end bearings. Scooter - thats the sort of answer I'm looking for. But the holes in the crank and the piston are the same size as my original bearings. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 8, 2009 Share Posted July 8, 2009 As the N/A and the tt both use the same crank and rods I wouldn't worry about it too much. Quote Link to comment Share on other sites More sharing options...
Scooter Posted July 8, 2009 Share Posted July 8, 2009 Scooter - thats the sort of answer I'm looking for. But the holes in the crank and the piston are the same size as my original bearings. Chris has given them the nod so i'm sure they will be fine, I will however have a good look at both NA and TT parts this evening out of curiosity Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 8, 2009 Share Posted July 8, 2009 Both rods have oil squirters, which the holes feed. The jet hole in the squirter is FAR smaller than even the small feed hole in the shells. Personally I'd err towards the smaller hole shell, assuming bearing material is the same, as you have more bearing area, but it's probably academic. Quote Link to comment Share on other sites More sharing options...
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