Ok, last shot if ya'll would be so kind thanks again for all the help so far.... Still not on the money so far unfortunately, still stiff as a wotsit! Some new facts however: 1. Bearing are large by .25mm ID, 1mmOD, Thrust 2mm (checked) 2. Crank journals are all round 3. Case appears to be round (though harder to measure when torqued down) 4.Dowels not the issue - removed all still the same problem But one clue I haven't got my head round yet - all bearings look good in an empty torqued case except thrust. It looks visually to be further into RHS of case. .55mm feeler gauge down one side .30mm own the other. Its always stuck in the RHS when I split the case. Always needs hammering to remove. I can't see why though. No dirt, old gasket, burrs etc. All measures the same to a fair degree of accuracy once dissembled. Need a sherlock I think! Ideas peeps?
New bearings yes? Check the OD of the new bearings against the old ones... It should give you an idea of what's going on
He said hes put back the same ones he took out I have heard of new dowel pegs being the wrong length before
Solved! Only took me 3 and a half days... The problem was the thickness of the thrust measurement on the case was not even all the way around. the same on the tops of the saddles when I was measuring but different on the base left vs right. The left was .3/.4 bigger than the right hence the bearing being seated more in the right, as I guess it couldn't squeeze between the larger gap. Solution was sanding the left the hammering the crank+bearing into the left. Crank turns smooth as can be. Thanks so much to everyone for the ideas/advice, vvvvmuch appreciated! Onwards
I would think it needs the thrust cutting square mate and align bore, if the bearing isn't in exactly square the chances are it may seize !!!
I agree with Mick, something is amiss, and I don't see how something solid can change by taking it to bits... From an engineering point of view, the case needs measuring to make sure that the main bearing seats are square and true!!
Yes I agree very odd, but it really does seem that the thrust bearing sitting more into one side of the case was the cause. Perhaps those who assembled the engine before me simply banged the bearing in hard enough that the force overcame the resistance of the flanges on case and stuck the bearing further in? Seems to explain one of my posts before that the crank needed to be banged out of the case rather than being lifted out... Seems all a bit cowboy, and of course it is. I think its either do nothing to the shortblock - all of the components are far from perfect - or splash out on a new one.
So the thrust bearing wasent seating properly that was all? Were you pushing it into place with just your fingers?
And a squiffy dowel pin. But yes. I hazard that normally torquing the case halves together would have naturally centred the bearing, albeit for a greater thrust on one side than the other? But I'm certainly no expert to call that.
Solvent wash tank... Everything gets degreased, then sprayed down with clean fresh solvent... I've also got an ultrasonic cleaning tank, but it needs looking at as cavitation isn't occurring
Wash tank solvent And panel wipe... I am serious about the panel wipe, @snotty knows I love the stuff... degreases, dewaxes, evaporates fast, and leaves virtually no residue!!
