I am stroking my 91 cherokee 4.0 with a 258 crank and 258 rods. My
crankshaft end play is at 0.0055 inches. The range is 0.0015-0.0065
inches . The ideal range is ~ 0.002-0.0025 inches. My machinist tells
me that the end play is perfect and less could cause friction
problems, i.e burn out. To me, if it is engineered for .002-.0025 that
should be the optimal range. I'm at the high end for wear according to
the manual, and I see this giving me less engine life.
Also, my side cleance is 0.022 in. and .019 in. for two of the
connecting rods. The range is 0.01-0.019 inches. My machinsts told me
the .022 will not be a problem.
I'm concerned with my machine shops responce. Yes it will run fine,
but how about 50K mi from now? Is my machinist BS'ing me becaused they
screwed up or are the tolerances acceptable for a rebuild?
- posted 17 years ago