08-04-2020, 08:02 AM
I've only worked on one 3 brg engine,and checking the centre bearing alignment it was within around .001". The general consensus of these engines was that the centre bearing was often out of line,this and insufficient oil to the centre main meant a short life.
One chap I knew made a new centre bearing undersize and line bored it when all clamped up with the block.
A couple of tricks I was told were ,To use 2 of the offside bolts, ( The ones that bolt the block down ) and drill the block to suit (now a 9 bolt block )
Blank the oil feed past the centre main where it feeds the camshaft bushes and drill a couple of small holes into the bushes from above .
Check the crank centre webs for cracks ,the copper pipe to the centre bearing and use an oversized oil pump.
They do make a nice smooth engine.
One chap I knew made a new centre bearing undersize and line bored it when all clamped up with the block.
A couple of tricks I was told were ,To use 2 of the offside bolts, ( The ones that bolt the block down ) and drill the block to suit (now a 9 bolt block )
Blank the oil feed past the centre main where it feeds the camshaft bushes and drill a couple of small holes into the bushes from above .
Check the crank centre webs for cracks ,the copper pipe to the centre bearing and use an oversized oil pump.
They do make a nice smooth engine.