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AMC Harmonic Vibration Damper Listing |
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captscot 
AMC Apprentice 
Joined: Feb/05/2013 Location: N Brunswick, NJ Status: Offline Points: 241 |
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 Posted: May/20/2015 at 9:10pm |
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Someone on Ebay has "AMC 401 3 bolt harmonic balancer" with casting number 3216085. I notice your list does not include a damper for a 1972 401, could this 3 bolt version be the damper used in 1972? Your list has a 401 damper #3216085 as a 4 bolt type.
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1972 Javelin AMX - orig owner
1985 Grand Wagoneer 1967 Jeepster 1968 Jeep Gladiator 1959 Jeep CJ5 1929 Marmon model 68 |
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304-dude
AMC Addicted 
Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9082 |
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Posted: May/21/2015 at 5:43am |
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In 72 they went with a 4 bolt damper and a change in offset on the pulleys. Plus the power steering unit had changed to GM Sagnaw.
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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captscot
AMC Apprentice
Joined: Feb/05/2013 Location: N Brunswick, NJ Status: Offline Points: 241 |
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Posted: May/21/2015 at 6:22am |
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I'm the original owner, my 304, car built late in May '72, has the 3 bolt damper, but yes has the GM pump. AMC for that year produced the 401 with different pulleys and a 4 bolt damper?
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1972 Javelin AMX - orig owner
1985 Grand Wagoneer 1967 Jeepster 1968 Jeep Gladiator 1959 Jeep CJ5 1929 Marmon model 68 |
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Hurst390
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Joined: Apr/20/2008 Location: secret Status: Offline Points: 5811 |
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Posted: May/21/2015 at 7:10am |
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I have a 73 401 with a 3 bolt damper and 090 heads..I believe early 73 production
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SC/Hurst Rambler
11.62 120 100% Street Legal |
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captscot
AMC Apprentice
Joined: Feb/05/2013 Location: N Brunswick, NJ Status: Offline Points: 241 |
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Posted: May/23/2015 at 8:58pm |
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Here's a 3 bolt for a 290 on ebay.
http://www.ebay.com/itm/AMX-AMC-Javelin-290-Harmonic-Balancer-Ambassador-Rebel-/141297447044?hash=item20e5fbf084&vxp=mtr |
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1972 Javelin AMX - orig owner
1985 Grand Wagoneer 1967 Jeepster 1968 Jeep Gladiator 1959 Jeep CJ5 1929 Marmon model 68 |
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70amcpwr
AMC Addicted
Joined: Feb/16/2011 Location: Moultonboro NH Status: Offline Points: 1485 |
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Posted: Jun/30/2015 at 7:03am |
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So.....if your stock motor is rebuilt (say my Oct build 360), new pistons used and bored .030 over, flywheel changed (correct replacement), should you change your damper. Obviously this won't match the "factory" balance as pistons and bores were match sized. I've had a vibration ever since the rebuild in 2005. The crime was it didn't need to be bored and the pistons were perfect (and got scrapped before I got there to p/u the motor).
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70amcpwr You just can't fix stupid.
SOLD 1970 BBO Javelin, wifes 73 AMX 360 4spd. Next project 1969 AMX |
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j2sax
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Joined: Sep/29/2010 Location: SW MO Status: Offline Points: 104 |
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Posted: Jun/30/2015 at 7:36am |
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Probably would have been a good idea to have the engine "balanced" at that time... that vibration is killer on bearings and will greatly reduce the life of the engine, though it will likely not cause a catastrophic failure. So a 100,000 mile engine becomes an 80,000 mile engine (for example, not saying that is true of your case!)
During balancing they spin balance the crank, balancer and flywheel and then weight match the pistons and rods to the lightest unit. At this point there is not much you can do short of that, though you may want to verify your flywheel part number if you did not previously... I have seen more than one build screwed up because the flywheel/flexplate was for the wrong engine. |
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j2sax@yahoo.com
Plenty of FSJ's Eagles and other AMC's near Springfield, MO |
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70amcpwr
AMC Addicted
Joined: Feb/16/2011 Location: Moultonboro NH Status: Offline Points: 1485 |
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Posted: Jun/30/2015 at 8:03pm |
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I actually got the flywheel myself so I know it's right. Wondering about a fluid damper? Isn't the torque converter balanced also?
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70amcpwr You just can't fix stupid.
SOLD 1970 BBO Javelin, wifes 73 AMX 360 4spd. Next project 1969 AMX |
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carnuck
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Joined: Mar/31/2010 Location: Seattle Status: Offline Points: 3942 |
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Posted: Jul/04/2015 at 5:38pm |
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AMC converters are zero balanced, unlike Chrysler ones, even though they use a modded Chrysler trans. It's essentially a slant 6 converter without the ring gear attached.
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Got an Eagle?
http://forums.amceaglesden.com |
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70amcpwr
AMC Addicted
Joined: Feb/16/2011 Location: Moultonboro NH Status: Offline Points: 1485 |
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Posted: Jul/07/2015 at 7:05am |
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Any luck with fluid dampers?
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70amcpwr You just can't fix stupid.
SOLD 1970 BBO Javelin, wifes 73 AMX 360 4spd. Next project 1969 AMX |
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