alright, looks like the f*ck up fairy visited me today. I replaced the front seal in my AW4 automatic and reinstalled it. Everything is back in and now when I start it I get this rhythmic metallic sound coming from the bellhousing area and a bad "whump-whump" vibration. The sound eventually went away at idle but as soon as I rev it a little it comes back. I torqued all 4 of the bolts on the flywheel-to-torque converter down and it doesn't feel/sound like it is coming from the flex plate/inspection cover.

What does a bad main bearing on the engine sound like? My jeep only has 57K miles and has always run a little rough since we bought the heep with 13K miles.

Any and all advice appreciated. And no this isn't a reason to buy a Toyota so save your breath ;)

Thanks

SeanP

Originally posted by SeanP
alright, looks like the f*ck up fairy visited me today. I replaced the front seal in my AW4 automatic and reinstalled it. Everything is back in and now when I start it I get this rhythmic metallic sound coming from the bellhousing area and a bad "whump-whump" vibration. The sound eventually went away at idle but as soon as I rev it a little it comes back. I torqued all 4 of the bolts on the flywheel-to-torque converter down and it doesn't feel/sound like it is coming from the flex plate/inspection cover.

What does a bad main bearing on the engine sound like? My jeep only has 57K miles and has always run a little rough since we bought the heep with 13K miles.
Thanks, SeanP

I seriously doubt it's the rear main bearing, not just after the tranny was serviced.

Sounds to me like that the torque converter tabs did not fully engage onto the tranny input. Did the tranny sit flush to the engine block, or was there a 1/4"-1/2" gap? If there was a gap, then you forced the components together, and will dump everything out. The sounds are, A: the torque converter bolts rubbing on the back of the block, B: the front pump of the tranny bound up, or C: did you put the flex plate in backwards, thus pushing the torque converter harder into the tranny? The flexplate, if you notice, has an offset between the torque converter bolts and the crankshaft.

Absolutely, DO NOT run it anymore until all has been checked out. :eek:

thanks.

the torque converter just slides on to the input shaft and the bell housing is seat against the engine. I put the bolts into the flywheel one at a time then bumped the engine with the starter to expost the other bolt holes. Maybe doing this caused the TC to come of the shaft and sit lopsided (like when you install your lug nuts and tighten them all in a clockwise pattern rather than a cross-pattern)

I am going to pull the bolts from the flywheel and then run the engine just to rule out that the engine is making the noise.

more later...

seanp

Crank angle sensor rubbing?