I have a freshly rebuilt 1450 .030 over, new piston & rod that makes the same noise. Really worried me at first and was told they all do it. While the engine was out I did the axle squeeze and ISO mod w/new factory mounts.
My 1250 w/unknown hrs makes the same noises.
Rec'd a lengthy reply from a gentleman in WA state who is a retired machinest.
He stated he had one w/the same problem and set out to find the source.
Seems as though these Kohlers are not all that tight on the tolerances when new. He found that the cam shaft ends and pockets in the block were not true. After lapping the block surfaces, trueing up the cam ends and shimming,
it eliminated the noise and stated he has done at least a dozen engines since and that procedure cleared up the noise in each case.
Dave S.
|