I am rebuilding a 3.0l 4JH1 engine for a landy conversion. I acquired a non running engine to see if it is rebuildable. It came from a 2004 NKR 200 truck and was described as seized.
Taking the head off, #3 piston was free and could be removed to reveal the bearing cap missing and a damaged big end bearing. With the bottom end now stripped down, big end bearings #2 & 3 are scored plus at least one main bearing. The missing conrod cap and bolts were in the sump. Apart from scored shells, the conrod, cap, piston, bore and bolts appear undamaged!
I would expect that if the conrod bolts came out during service then all hell would break loose in terms of crank-conrod contact, or necked bolts etc. There is nothing. A few of the sump bolts were loose, so maybe it was inspected before it catastrophically failed?
What are the symptoms of multiple bearing failure? Screaming noise? Enough to stop before catastrophic failure?
So on from here. These cranks appear to be not regrindable. I have a lead on a replacement 2nd hand crank. Obviously new shells required throughout. The manual says the bores should not be rehoned. Should I replace the rings whilst here?
Another issue may be flushing everything to get rid of the chrome flakes about the place?
I'd value your advice.
Bookmarks