Been out of the picture for awhile after Covid sent my business for a spin and automotive activities went on a back burner. In the meantime--bad news. My 2UZ rebuild with Kelford cams seized before I got a chance to finish tuning it. Nothing dramatic--it just sounded like a stall after I started pulling away from a stop sign. I thought the alternator had failed or something, because there were no other sounds, sights or smells.
Just got the report from the builder. It looks like one of the valve keepers--or locks--failed in #4, and dropped a valve into the cylinder. They were stock valve locks, which Kelford said should be no issue with the 208-B cams. Builder said it looked like another keeper in a different cylinder was close to failing as well. Builder said it looks like there was an indentation in the shim under the keeper.
Good news is the damage is light--just a piston head to replace and a bit of machining before they put the motor back together. The question is, why did the valve locks fail? Are the 208-B cams too much for the stock ones and should upgrade to chromoly? Or is there something else we're getting wrong in the setup? We've followed Kelford's recs so far.
Thanks as always for any insights.
Just got the report from the builder. It looks like one of the valve keepers--or locks--failed in #4, and dropped a valve into the cylinder. They were stock valve locks, which Kelford said should be no issue with the 208-B cams. Builder said it looked like another keeper in a different cylinder was close to failing as well. Builder said it looks like there was an indentation in the shim under the keeper.
Good news is the damage is light--just a piston head to replace and a bit of machining before they put the motor back together. The question is, why did the valve locks fail? Are the 208-B cams too much for the stock ones and should upgrade to chromoly? Or is there something else we're getting wrong in the setup? We've followed Kelford's recs so far.
Thanks as always for any insights.