Wobbly Crank Pulley
#1
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Year: 96
Model: Cherokee
Engine: 4.0 HO
Wobbly Crank Pulley
So, I am hunting down a tick/knock that is not lifter or exhaust related. I checked my oil pressure, and its good, 55psi cold start, warmed up and was sittin around 35-40.
While doing this, I noticed my crank pulley was wobbling. Could this cause a knocking sound?? I checked the bolt, and its tight, so I am assuming the pulley itself is bad.
While doing this, I noticed my crank pulley was wobbling. Could this cause a knocking sound?? I checked the bolt, and its tight, so I am assuming the pulley itself is bad.
#2
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Year: 1998 XJ
Model: Cherokee
Engine: 4.0L
Possibly, you definitely need to change your harmonic balancer, check out some of my prior threads. It could be a number of things, if you balancer has separated far enough, it could be hitting the back of the mechanical fan, but that would be a "ting" sound. It could also be your water pump bearing going bad. That would sound just like a wavering knock. The list goes on. Pick up a maintenance stethoscope and start poking around. If you don't have access to one, a 3 ft Water hose can give you almost the same results
#3
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Year: 96
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Engine: 4.0 HO
the knock comes from the back of the engine.. I realy hope I dont have a bunch of worn out barrings and crank walk : the entire pulley is moving, not just the outside part, the rubber between the two parts looks normal, dry but normal....
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Year: 96
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yup, they where a little loose, so I tightened them all up. i inspected the flexplate while I did that and saw no cracks.
the knock goes away after about 1500-2k rpm, and it runs great otherwise.
the knock goes away after about 1500-2k rpm, and it runs great otherwise.
#7
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here is a short video i took of it the other day..
http://static.photobucket.com/player...pse692e265.mp4
http://static.photobucket.com/player...pse692e265.mp4
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#9
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#10
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Year: 1998 XJ
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Ok saw that one, doesn't sound good but I would get a stethoscope on it and isolate more, I would also take the belt off and run it, just to eliminate the pulley components.
#11
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Year: 96
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So I went and picked up a new balanced and rented the tool to do the job. Crossing my fingers on this one.... just waiting on the garage to warm up.
#12
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Year: 1993
Model: Cherokee
Engine: 4.0 HO
1 holding belt .. other guy impacting bolt off
a small impact will fit in there without removing grill / front end stuff
but watch PSI .. that 1 job toasted impact .. big compressor on lil tool .. killed it .. ouch
#13
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I dont have air tools. I'm gonna use the starter to get it loose. Unhook the coil, put my long breaker bar on it and bump the key. It works g
reat.
reat.
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Year: 1998 XJ
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Leave the belt on while you loosen the bolt, put a wrench on hit a loosen with a couple quick blows. Make sure you use the installation tool also, if not, good luck keeping the motor from turning
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Year: 1993
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Engine: 4.0 HO