Originally posted by scottynoface
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side to side play is needed.....but there should be no up-down play between the rod and piston.
there is a fairly easy way to check if it is rod bearings without completely removing the engine, as long as you can get the head off, but it's a two man job.
here is how:
1) remove head
2) put a socket on front sprocket nut
3) turn engine over so #1 piston is at top of cylinder. then take a big screwdriver and hold the end of it against the top of the piston....straight up and down, perpendicular to the piston, and apply a bit of pressure to it.
4) have you buddy get a strong arm the socket on the sprocket nut and start rocking the engine back and forth. not much...just enough to make the piston move slightly. if you have any slop in your rod bearings, and are paying attention, you should feel a slight "clunk" through the screwdriver if your rod bearings are bad. repeat this procedure with the piston half way down, then all the way down, then half way back up again. do this on all 4 cylinders.
I should advise that not everyone has the "feel" for this test. my dad does. if you have a rod knocking in any car engine, he will be able to tell you exactly which one it is.
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