I've got a knock that comes and goes that my mechanic says is in the bottom end of the motor. After looking at YouTube videos, I think it's my flexplate. After inspecting the flexplate I've discovered that there a currently only 3 bolts holding it to the torque converter. I know there's suppose to be 4. Could this be my problem? I'm trying to locate a place to buy the bolt. Online they are going for $13 per bolt .
Flexplate knock?
- Thread starter Fletcher34
- Start date
I'd check ACE Hardware for the bolt. But yes, I think that very well could be your issue!
Yes and do so quickly or the flex plate may develop cracks from excess flex plate vibration.
This issue could also develop new driveline vibrations.
If the flex plate vibrations are bad enough it could also damage the main AT pump which is at the front of the transmission .
This issue could also develop new driveline vibrations.
If the flex plate vibrations are bad enough it could also damage the main AT pump which is at the front of the transmission .
^^^x2!!! Get the bolt replaced ASAP.
You didn’t say what year your Jeep is and I only have a parts manual for my 2006. Mine takes (4) 06504383 Bolts. I saw them on Amazon for $6.00 each, free shippping. From some other online Mopar places I saw this bolt for $2.64 and $3+ didn’t check shipping.
The factory bolt will have a thread locker patch applied. I’d be tempted to replace all four bolts while I was in there. I’d also use the factory bolt when making the final repair.
If you are looking up the part number for your particular vehicle, search for “drive plate” not “flex plate”. Drive plate is how Jeep refers to the part.
You didn’t say what year your Jeep is and I only have a parts manual for my 2006. Mine takes (4) 06504383 Bolts. I saw them on Amazon for $6.00 each, free shippping. From some other online Mopar places I saw this bolt for $2.64 and $3+ didn’t check shipping.
The factory bolt will have a thread locker patch applied. I’d be tempted to replace all four bolts while I was in there. I’d also use the factory bolt when making the final repair.
If you are looking up the part number for your particular vehicle, search for “drive plate” not “flex plate”. Drive plate is how Jeep refers to the part.
Got the 4th bolt from the dealership yesterday and installed once I got home. I backed off the other 3 a little bit and then re-tightened. So far the knock sound has not come back. Keeping my fingers crossed that this fixed the problem.
I am not sure if it is the same but I had a similar problem in my 97 TJ where I thought that the bolt heads every now and then would rub against the back of the cover plate to test it I experimented by temporarily by putting some washers in behind the little cover plate as spaces when that worked I took the cover off and panel beated it out with a ball peen hammer as a more permanent fix
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My bolts were not hitting the dust cover. The only thing I can come up with is the fact the plate only had 3 of the 4 bolts installed caused it to be off balance??? I'm not totally sure. I just know that, as of now, the sound has not returned after installing that 4th bolt.
Back in the 80s I drove a company Chevy van that developed a similar knock. The boss knew my mechanical skills but I was needed really bad in the field and he sent the van to the local dealer for an estimate. It came back with a $3000 "rod knock". I talked the boss into repairing the thing during the evening after the field work was done. I pulled the bell housing cover off and imediately saw the problem...the flex plat bolts were all in but had loosened to the point where the holes were all eggshaped. I replace all the bolts, flat and lock washers and even tack welded the flat washers so they wouldn't slip again. The fix was 2 hrs labor and grade 8 hardware versus $3000 rod knock repair! AMEN!!
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