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Rotating flywheel against TC for balance |
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cnagorka
AMC Apprentice Joined: Jan/02/2014 Location: Saint Albans, W Status: Offline Points: 200 |
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Posted: Nov/11/2021 at 8:17am |
Hello guys: I have a '67 Ambo 290/T35, my dad replaced the flywheel when I was in high school (back in '86!) and the engine was never as smooth after that. Before the work the engine revved incredibly smoothly, now it has more vibrations at different rev ranges. I've changed out the harmonic balancer, which looked bad, but made no difference. I figured I'd have to take the transmission out, take the flywheel off and have it balanced somewhere (it was from a salvaged car, I don't know what model it came from, but it's been in there since 1986). But a friend of mine said to try something else first: unbolt the flywheel from the torque convertor, and rotate the flywheel to the next position where the holes line up, rebolt it and try it again. Keep going and at one of the positions it'll solve the problem. Now: he's done this on Chevys, not AMCs but it seems to make sense, and he said any time he had a balance problem like this it would fix it. Have any of you done this? CN
Edited by cnagorka - Nov/11/2021 at 8:19am |
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1961 Ambassador Custom, 1967 Ambassador 990, 1960 Rambler Six Super, '65 American 440
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6PakBee
Supporter of TheAMCForum Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Offline Points: 5454 |
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The bolt pattern will only allow the flywheel to bolt up in one position. I think it would be good idea to drop the flywheel and see if you have the correct one. Even today AMC flywheels seem to be a source of confusion for many (including me).
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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mbwicz
Supporter of TheAMCForum Joined: Feb/20/2019 Location: Buffalo, NY Status: Offline Points: 1979 |
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I think that the 290 does not have a counterweight on the engine side of the flywheel. I'm not sure if you can see the back side of the flywheel when its on the car, but if there is a cube of iron cast in near the starter ring, you have the wrong flywheel for the 290. 343 and 390 have the counterweight.
Mike |
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1970 AMX, one step forward, one step back. Both steps cost time and money.
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BU1
AMC Addicted Joined: Aug/11/2016 Location: MN Status: Offline Points: 1971 |
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The OP is using confusing terminology. He says he has a torque converter, therefore he has a flexplate, not a flywheel. And 343 flywheels have no counterweight on the backside.
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AMO #2726
#1 1968 AMX Rally Green 343 Z code 4spd since 1975 #02642 #2 1968 AMX Rally Green 290 N code 4spd since 2019 #02959 |
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cnagorka
AMC Apprentice Joined: Jan/02/2014 Location: Saint Albans, W Status: Offline Points: 200 |
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Flexplate is correct, I've heard the terms used interchangeably so I'll call it a flexplate from now on. And I'll check for the weight to determine if it's the right one for the car.
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1961 Ambassador Custom, 1967 Ambassador 990, 1960 Rambler Six Super, '65 American 440
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mbwicz
Supporter of TheAMCForum Joined: Feb/20/2019 Location: Buffalo, NY Status: Offline Points: 1979 |
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And 343 flywheels have no counterweight on the backside. [/QUOTE]
Thanks for the info. I read that the 360 had one so I figured the 343 did. Learning every day! Mike
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1970 AMX, one step forward, one step back. Both steps cost time and money.
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BU1
AMC Addicted Joined: Aug/11/2016 Location: MN Status: Offline Points: 1971 |
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Up near the top of this section of the forum is a sticky post titled "Flex Plate ID". Compare the photos there to what you have installed in your car,
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AMO #2726
#1 1968 AMX Rally Green 343 Z code 4spd since 1975 #02642 #2 1968 AMX Rally Green 290 N code 4spd since 2019 #02959 |
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cnagorka
AMC Apprentice Joined: Jan/02/2014 Location: Saint Albans, W Status: Offline Points: 200 |
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Shall do!
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1961 Ambassador Custom, 1967 Ambassador 990, 1960 Rambler Six Super, '65 American 440
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cnagorka
AMC Apprentice Joined: Jan/02/2014 Location: Saint Albans, W Status: Offline Points: 200 |
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So as it turns out, when you have a transmission mount in three pieces, and the transmission housing is resting on the cross member, it'll fool you in to thinking something in the engine is out of balance...new mount=smooth as butter= no need to do anything with the flexplate Thanks for the responses. Here's what came out of the car: |
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1961 Ambassador Custom, 1967 Ambassador 990, 1960 Rambler Six Super, '65 American 440
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6PakBee
Supporter of TheAMCForum Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Offline Points: 5454 |
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Sometimes the solution is not obvious! Congratulations on finding it. I am curious, what led you to the rear mount?
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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