Bad thrust bearings? - JeepForum.com
 
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post #1 of 5 Old 01-24-2020, 06:26 PM Thread Starter
FlexJ17
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Bad thrust bearings?

A couple days ago my vehicle starting making a loud knocking noise coming from inbetween bellhousing and engine. The knocking increases with rpm in all gears (park,neutral,1,2,3,d) the only Time it gets quiet is right when it shifts to 4th gear.i checked out torque converter and flexplate for cracks and went ahead and ordered a new torque converter and flexplate but upon looking at things through the trans inspection cover the flexplate has back and forth play at the crank. I went to the front to the harmonic balancer and pried that back and forth and the flexplate/torque converter moved with it when i pryed it. I do believe the fp might have cracks where it mounts to crankshaft. I dont have the finances to rebuild the engine right now but i am mechanically inclined and seeing if the problem is the thrust bearings? Is that all i change. Do i need special tools? If it is the bearings why would the knocking quiet down in 4th?

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post #2 of 5 Old 01-24-2020, 07:48 PM
car6car
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trust bearings are usually easy to replace
remove oil pan
remove crank cap(?)

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post #3 of 5 Old 01-24-2020, 07:55 PM
2oldjeeps
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?, dont know. wonder what makes it want to move anyway?
torq conv can slip on input shaft..
much movement

would affect oil pressure? rods and all mains?
ill watch...

99wj,143,000 miles
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post #4 of 5 Old 01-24-2020, 08:12 PM Thread Starter
FlexJ17
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Yea i was thinking of just replacing as you say but im reading that you cant just replace those bearings you have to resurface the journals as well. My oil pressure is fine it hasnt change since before/after the noise. What gets me is the noise goes away almost conpletely only in fourth gear
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post #5 of 5 Old 01-25-2020, 04:35 AM
car6car
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Quote:
Originally Posted by FlexJ17 View Post
Yea i was thinking of just replacing as you say but im reading that you cant just replace those bearings you have to resurface the journals as well.
Most likely not. You will see journal after removing crank cap.
Measure crank free play, check specs.

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