2001 Grand Cherokee laredo Breaking rocker studs
11-26-2018, 12:34 PM
#1
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Year: 2000
Model: Cherokee
Engine: 4.0L
2001 Grand Cherokee laredo Breaking rocker studs
This is a friends jeep,
He had developed a definite miss. After much trouble shooting etc he found a broken rocker arm stud. He checked everything for binding, sticking, galling etc. And replaced the rocker stud all good again. Or so he thought ! Then after driving less than 50 miles, YEP a Dead miss, Found a second rocker stud broken. (different location). When he opens it up there seems to be nothing binding, nothing stuck etc. everything moves freely....
What could be going on here ?
He had developed a definite miss. After much trouble shooting etc he found a broken rocker arm stud. He checked everything for binding, sticking, galling etc. And replaced the rocker stud all good again. Or so he thought ! Then after driving less than 50 miles, YEP a Dead miss, Found a second rocker stud broken. (different location). When he opens it up there seems to be nothing binding, nothing stuck etc. everything moves freely....
What could be going on here ?
11-26-2018, 09:31 PM
#2
Old fart with a wrench
What engine? 4.0's have bolts and 4.7's don't have anything.
11-27-2018, 02:43 PM
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Year: 2000
Model: Cherokee
Engine: 4.0L
Inline 4.0 6cyl.
He said this will be the 3rd time he has developed trouble and found a rocker bolt broken. I asked him to bring me the bolt to look at...
He said this will be the 3rd time he has developed trouble and found a rocker bolt broken. I asked him to bring me the bolt to look at...
11-30-2018, 09:47 PM
#4
Old fart with a wrench
The only way I can see that happening is if a high lift cam was installed without checking the rocker pivot clearance or the pushrods are too long. OEM pushrods are 9.650" long.
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