What went wrong? flex plate, converter, or tranny? - Moparts Forums

Register Log In Moparts Forums Moparts Question and Answer What went wrong? flex plate, converter, or tranny?

Print Thread

Page 2 of 3

1

2

3

Re: What went wrong? flex plate, converter, or tranny? [Re: 71nonRT340shaker] #1483580 08/13/13 08:54 PM 08/13/13 08:54 PM
Joined: Jul 2013 Posts: 116 Pa 71nonRT340shaker OP member
71nonRT340shaker OP member Joined: Jul 2013 Posts: 116 Pa	Here's the converter its fairly small in diameter compared to some I've seen may or may not be the correct one? Also the flat you can see in the pic is where the weights would be, and this motor shouldn't have any on the converter, correct? Thanks again for helping me out... 7813187-IMG_8266.JPG (108 downloads)

Re: What went wrong? flex plate, converter, or tranny? [Re: 71nonRT340shaker] #1483581 08/14/13 12:09 AM 08/14/13 12:09 AM
Joined: Aug 2003 Posts: 43,099 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,099 Bend,OR USA	Quote: Here's the converter its fairly small in diameter compared to some I've seen may or may not be the correct one? Also the flat you can see in the pic is where the weights would be, and this motor shouldn't have any on the converter, correct? Thanks again for helping me out... That is a after market race converter, not a stock one I think I see a washer under one of the converter mounting bolts, take it out and leave it out It looks like your working on a SB motor, yes? Next thing is to figure out if the motor was a externally balanced cast iron crankshaft motor originally or not What crankshaft dampener is on it now? Post a picture of the front of the motor with the pulleys and dampener so we can see them from the front Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: What went wrong? flex plate, converter, or tranny? [Re: Cab_Burge] #1483582 08/14/13 12:24 AM 08/14/13 12:24 AM
Joined: Jan 2003 Posts: 32,911 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,911 Grand Prairie,Texas	I looks like a crankshaft bolt head or something is against the converter in the second photo and that shouldn't be. And you still need to figure out why the flex plate ears are bent.

Re: What went wrong? flex plate, converter, or tranny? [Re: stumpy] #1483583 08/14/13 02:04 AM 08/14/13 02:04 AM
Joined: Aug 2005 Posts: 11,543 chicagoland,usa B buildanother I Live Here
buildanother I Live Here B Joined: Aug 2005 Posts: 11,543 chicagoland,usa	You wouldn't be the first one to experience flexplate to insp cover carnage. Everything else looks pretty much normal.

Re: What went wrong? flex plate, converter, or tranny? [Re: buildanother] #1483584 08/14/13 05:34 AM 08/14/13 05:34 AM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	Bolt head looks pretty thick, funny it didn't hit on the block webbing. Also on the dusct cover. There are a couple of variations with the converter mounting screw groove in a different location depending on the converter used.

Re: What went wrong? flex plate, converter, or tranny? [Re: Cab_Burge] #1483585 08/14/13 06:54 AM 08/14/13 06:54 AM
Joined: Jan 2003 Posts: 926 MICHIGAN B BB65Barracuda super stock
BB65Barracuda super stock B Joined: Jan 2003 Posts: 926 MICHIGAN	I think I see a washer under one of the converter mounting bolts, take it out and leave it out! Cabs right, looks like wrong bolts and the washers aren't helping. That's obviously what is tearing up the inspection plate. 1957 Power wagon wm300 original 10.000 mile truck, 1964 dodge Polara Convertible numbers matching

Re: What went wrong? flex plate, converter, or tranny? [Re: Cab_Burge] #1483586 08/14/13 08:24 AM 08/14/13 08:24 AM
Joined: Jul 2013 Posts: 116 Pa 71nonRT340shaker OP member
71nonRT340shaker OP member Joined: Jul 2013 Posts: 116 Pa	Quote: It looks like your working on a SB motor, yes? Next thing is to figure out if the motor was a externally balanced cast iron crankshaft motor originally or not What crankshaft dampener is on it now? Post a picture of the front of the motor with the pulleys and dampener so we can see them from the front Cab this is from earlier in my post I can get a pic this evening if needed but: The motor is a 9-9-68 casting 340 with the early (thinner) dampener which I already swapped with another one I had of a 70 motor, the converter doesn't have any weights welded onto the flat spots on the motor side. I thought this was all correct maybe I'm wrong? It's a 727, and it vibrates in park, neutral, and all forward/reverse gears. Timing is set at 28 or 30 flat with no vacuum advance, electronic conversion Evan's harness and MP dist, orange box. Thanks again for all of the great feedback, I'm happy to hear the washers and what not don't look ok. I'm well on my way to getting the tranny out, and it should be out by the weekend. It's not the ideal setup by any means the car is on jack stands and I'm laying on the garage floor. Makes sense it's not the stock converter the car doesn't engage like a newer daily driver when you put it in drive, and the neighbors love when I pull it in the garage at 10pm.

Re: What went wrong? flex plate, converter, or tranny? [Re: 71nonRT340shaker] #1483587 08/14/13 09:09 AM 08/14/13 09:09 AM
Joined: Jan 2007 Posts: 685 pennsylvania poboyengineering mopar
poboyengineering mopar Joined: Jan 2007 Posts: 685 pennsylvania	Quote: Flex plate with basically the rust rubbed off. doesn't it look like the bolts holding the flexplate to the crank are hitting the converter? that would keep the converter too far away from the crank, and then the installer just pulled the ears down with the bolts, distorting the flexplate? just my It may be ugly, but it sure is slow. Girls comb their hair in rear view mirrors and the boys try to look so hard....

Re: What went wrong? flex plate, converter, or tranny? [Re: poboyengineering] #1483588 08/14/13 09:40 AM 08/14/13 09:40 AM
Joined: Jul 2013 Posts: 116 Pa 71nonRT340shaker OP member
71nonRT340shaker OP member Joined: Jul 2013 Posts: 116 Pa	Quote: the installer just pulled the ears down with the bolts, distorting the flexplate? just my I have my fingers crossed that's exactly what went wrong. With any luck a new plate, and 10 bolts and I'm good to go.

Re: What went wrong? flex plate, converter, or tranny? [Re: 71nonRT340shaker] #1483589 08/14/13 09:51 AM 08/14/13 09:51 AM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	Quote: Quote: the installer just pulled the ears down with the bolts, distorting the flexplate? just my I have my fingers crossed that's exactly what went wrong. With any luck a new plate, and 10 bolts and I'm good to go. How would a distorted flex plate cause a vibration?

Re: What went wrong? flex plate, converter, or tranny? [Re: 71nonRT340shaker] #1483590 08/14/13 10:00 AM 08/14/13 10:00 AM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	I once had trouble with a 318 we but in a truck ended up the front pass motor mount was installed on the ears wrong. causing motor and tranny to be missaligned a bit always had to force it a bit to get trany in cross over right. One i fixed it vibration was gone?? On a 340 is there not some shiming to do with certain mounts to make sure it is in right!

Re: What went wrong? flex plate, converter, or tranny? [Re: Challenger 1] #1483591 08/14/13 10:24 AM 08/14/13 10:24 AM
Joined: Jul 2013 Posts: 116 Pa 71nonRT340shaker OP member
71nonRT340shaker OP member Joined: Jul 2013 Posts: 116 Pa	Quote: How would a distorted fex plate cause a vibration? If I'm understanding this correctly: If the crank bolts are hitting the converter and they tightened the first flex plate bolt all the way initially, you would have to draw the plate to the converter with other 3 bolts (after the first one is tight the plate would be putting force on the heads of the other 3 bolts, or pulling away from the converter) which would bend the ears and create a spring like tension VS the plate laying flat against the converter as it should be and the bolts simply holding the 2 together.

Re: What went wrong? flex plate, converter, or tranny? [Re: 71nonRT340shaker] #1483592 08/14/13 01:08 PM 08/14/13 01:08 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	There's an assumption that the OP is making that doesn't sound right to me. On stock converters that have weights, like for a 340 cast crank or 360, the weights are welded to the OD of the converter shell. But the OP has mentioned twice now that the weights would be welded to the flat area above the mounting bolt. Is this common? I am not that familiar with aftermarket converters and want to know. R.

Re: What went wrong? flex plate, converter, or tranny? [Re: dogdays] #1483593 08/14/13 01:37 PM 08/14/13 01:37 PM
Joined: Jan 2003 Posts: 9,436 Blair County,PA 62maxwgn master
62maxwgn master Joined: Jan 2003 Posts: 9,436 Blair County,PA	Remember,there are two different size bolt holes in the flex plate depending on the application,if you have a converter that uses small bolts and a plate with big holes,it will never be centered!!

Re: What went wrong? flex plate, converter, or tranny? [Re: 71nonRT340shaker] #1483594 08/14/13 08:58 PM 08/14/13 08:58 PM
Joined: Nov 2007 Posts: 245 Western PA O OldMoparMan enthusiast
OldMoparMan enthusiast O Joined: Nov 2007 Posts: 245 Western PA	There is something to what challenger1 said about the vibration even if the flex plate is bent from bolt pressure if it's centered it shouldn't cause vibration. Because you stated that the engine runs smooth at idle that would tend to eliminate any part of the rotating assembly parts being off center or heavy to one side. If the vibration increases with the engine rpm's then something has to be deflecting and possible rubbing I run a high speed balancing machine for electric motors and it doesn't matter if it's turning 400 or 2000 rpm's the out of balance amount doesn't change the only way to change it is to add or remove weight Living with ALS help support the search for a cure Thanks http://web.alsa.org/site/TR/Walks/WesternPennsylvania?team_id=347781&pg=team&fr_id=12069

Re: What went wrong? flex plate, converter, or tranny? [Re: OldMoparMan] #1483595 08/15/13 12:11 AM 08/15/13 12:11 AM
Joined: Jul 2013 Posts: 116 Pa 71nonRT340shaker OP member
71nonRT340shaker OP member Joined: Jul 2013 Posts: 116 Pa	I didn't get much from ripping the trans out aside from the back of my head being soaked with transmission fluid and anti-freeze. The flex plate bolts were not very tight, none of the holes were rounded out or threads smoothed. Otherwise I don't see any damage. I also didn't take the converter out but I can't feel any weights on the back side of it either. I'm going to order a new flex plate and bolts while it's apart, as well as motor mounts simply because they say made in Korea. I was hoping there would be a sign of something but I guess you don't know until you look. If it still shakes when it goes back together I guess I'll have to drop the pan to check the crank, and or put a new converter in it. On a lighter note I can drop a 727 myself in a lot less time than I thought it'd take. 7814735-IMG_8275.JPG (80 downloads)

Re: What went wrong? flex plate, converter, or tranny? [Re: 71nonRT340shaker] #1483596 08/15/13 12:12 AM 08/15/13 12:12 AM
Joined: Jul 2013 Posts: 116 Pa 71nonRT340shaker OP member
71nonRT340shaker OP member Joined: Jul 2013 Posts: 116 Pa	converter 7814736-IMG_8277.JPG (99 downloads)

Re: What went wrong? flex plate, converter, or tranny? [Re: 71nonRT340shaker] #1483597 08/15/13 12:42 AM 08/15/13 12:42 AM
Joined: Aug 2003 Posts: 43,099 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,099 Bend,OR USA	You might want to send that converter out to a good shop like ATI or Turbo Action and have them run it on thier converter dyno to see if it is out of balance or hurt internally Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: What went wrong? flex plate, converter, or tranny? [Re: Cab_Burge] #1483598 08/15/13 07:15 AM 08/15/13 07:15 AM
Joined: Jan 2003 Posts: 926 MICHIGAN B BB65Barracuda super stock
BB65Barracuda super stock B Joined: Jan 2003 Posts: 926 MICHIGAN	Quote: You might want to send that converter out to a good shop like ATI or Turbo Action and have them run it on thier converter dyno to see if it is out of balance or hurt internally Much cheaper than a new unit and you will be certain to have a good piece when you get it back. 1957 Power wagon wm300 original 10.000 mile truck, 1964 dodge Polara Convertible numbers matching

Re: What went wrong? flex plate, converter, or tranny? [Re: BB65Barracuda] #1483599 08/15/13 09:07 AM 08/15/13 09:07 AM
Joined: Jul 2013 Posts: 116 Pa 71nonRT340shaker OP member
71nonRT340shaker OP member Joined: Jul 2013 Posts: 116 Pa	Any idea on the cost and a ball park turn around? I need to have it back together before the weather goes south.

Page 2 of 3

1

2

3

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1