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Trying Hard not to Hate "The Anti Prius"

2 day trip threw me off.... Anyways, the drivetrain torque would lift the tranny up as well, busting the housing itself, this is something else. Possibly a bent crank or imput shaft? Or something is shock loading the h#ll out of the driveline, but I wouldnt bet that would break first, I would bet on a u-joint breaking over that in a shockload situation.


Or, maybe the converter and the flexplate arnt lining up square and exactly perfect like, causing it to throw it outa balance and kapow.
 
I do have to ask.. :o

you are properly torquing and locktiteing the crank bolts correct? other than rotating assembly, it's THE most important bolts to do evenly and properly...

at work, Jasper will void ANY motor warranty if they are not done properly.. tags all over the mills when I get em...
 
For it to be breaking them like that, it has to be constantly flexing. Sounds like the centerline of the crank and transmission input are not parallel causing the plate to have to bend more than designed to or the hub on your converter is pushing against the crank shaft. When you swap them, does the converter touch one part of the flex plate before another or do you have to pull the plate up against the converter?
 
I forget what causes it but sometimes the tranny can push outward on the torque converter. I wouldtthink tho if it was happening that badly that it would make itself evident beforebbreaking the flex plate.
 
The only vehicle I have seen do this repeatedly had had a bad crank alingment pin. Would not let the converter seat into the crank all the way. Took 4 flex plates to figure that out.
 
I am leaning towards something with the crank and play. Remember my Distributor ordeal with wearing out the bronze gears? I have not fixed that issue proper, but rather just kept up the replacement of them.
 
ryoken said:
I do have to ask.. :o

you are properly torquing and locktiteing the crank bolts correct? other than rotating assembly, it's THE most important bolts to do evenly and properly...

at work, Jasper will void ANY motor warranty if they are not done properly.. tags all over the mills when I get em...
Click to expand...

To the best of my ability to follow instructions Yes I am.
 
Does the tranny or motor have the dowel pins located in it that go in between their mating surfaces?
 
ryoken said:
thrust bearing issue?
Click to expand...

:dunno: I will need to talk with my engine builder. As far as motor internals I have limited knowledge. I am but a glorified parts changer

454Sub said:
Does the tranny or motor have the dowel pins located in it that go in between their mating surfaces?
Click to expand...

Yes motor has a dowel pin.
 
if the motor still starts, have someone start it while you watch the harmonic balancer.. watch for front to back movement when it fires up... anything noticable is bad..

I've seen Yanmar's move an inch front to back with bad thrusts in em... :eek1: :haha:
 
Thrust bearing would make sense, but there would be other stuff going on I would think too, abnormal bearing wear (glittery pan), timing chain digging into the cover, but that could also be your dizzy gear wear problem as well. If the crank is got to much play, I could see it dragging the cam around via the timing chain and messing with your dizzy gear, only thing that kinda makes me think its something else is the converter isnt solid mounted to the input shaft, its obviously mounted to the crank, which if it pulled it back and forth, I wouldnt see it breaking the flexplate in that way. As its able to slide in and out of the input shaft. Now something that is possible is maybe the converter wasnt seated into the pump all the way and pushing on the flexplate, and when the motor jumps around and its bound up on the input it fractures the plate. But I would think it would tear up the pump and cause the tranny to mess up. Quite the dilemma you have.
 
Well I know the trans pump is fine because just last month (In case nobody remembers I broke the trans housing in 1/2) in an unrelated dune to dune transfer mishap:whistle: thus having all the internals of the trans put into a new case. Trans guy said everything was bitchen and there was no real signs of wear on anything. P.S. don't forget I had the trans totally rebuilt and beefed up last Feb. and since then I have now lost 3 flex plates. I am wondering now if the torque converter itself might play a role in this. The trans is a TH400 but the converter is a modified and beefed up TH350 converter (from what I understood from the trans guy) I will have to call him. I also just changed the oil in the motor right before we went out and it did not have any glitter.
 
ryoken said:
if the motor still starts, have someone start it while you watch the harmonic balancer.. watch for front to back movement when it fires up... anything noticable is bad..

I've seen Yanmar's move an inch front to back with bad thrusts in em... :eek1: :haha:
Click to expand...

Yes it still starts as the flex plate has not completely come apart yet. How much is really anything. Could I just use a pry bar while it is NOT running to see this movement?
 
yeah, you can sometimes see it by prying forward than back...

is that a high stall converter? they can beat on thrust bearings pretty hard.. i'm much more inclined to believe it's an issue with the converter tho.. especially if it's somewhat "hot"...
 
We also had an aftermarket converter that had a tapered centering lug. No idea what it came off of. But it would not go completely into the crank. Saw it before any damage because we had to suck the converter forward with the bolts. So new something was wrong.
 
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