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401 harmonic balancer 71, 72 interchange |
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amx39068 
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Joined: Feb/21/2008 Location: Arizona Status: Offline Points: 11576 |
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 Posted: Dec/20/2010 at 11:16pm |
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The 4 bolt balancer will need to be match balanced to the correct 390 balancer. They are not the same.
The deeper water pump pulley is for the longer shaft water pump.
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Dan Curtis-Owner and CEO AZ AMC Restorations; Facebook: https://www.facebook.com/amcmusclecars/ & Curtis Real Estate Development
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PHAT69AMX
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Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5919 |
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Posted: Dec/21/2010 at 4:21am |
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AMC Part Numbers from 1967 thru 1972 Parts Catalog F-14072 R3
Group 1.045-1 DAMPENER, Crankshaft Vibration
67/69 ... SIX ............................... 317 7345
70 ...... SIX (* 1-32) ...................... 317 7345
70 ...... SIX (* 1-33) ...................... 321 1894
71/ ..... SIX ............................... 321 1894
67/69 ... 290 ............................... 318 0477
70/ ..... 304 ............................... 319 6924
67/69 ... 343 ............................... 318 1612
70/ ..... 360 ............................... 319 6925
68/69 ... 390 ............................... 319 1689
70 ...... 390 ............................... 319 6925
71/ ..... 401 ............................... 321 1454
* 1-32 - On 1970 (232) used prior to Engine Build Code Number 307E20
................ (199) Engine NOT affected by this change.
* 1-33 - On 1970 (232) used beginning with Engine Build Code Number 307E20
................ (199) Engine NOT affected by this change.
Group 1.046-1 PULLEY, Vibration Dampener
67 ...... 199 (WEEP-LPS-LAC)................. 318 1227
67 ...... SIX (LHD-WAC)(LHD-WPS-LAC-LEEP) ... 317 3097
67 ...... 232 (60 Amp. Alt.) ................ 317 4696
68/ ..... SIX (LHD-WPS)(LHD-WAC) ............ 319 1002
68/ ..... SIX (65 Amp. Alt) ................. 317 4696
67/ ..... V8 ................................ 448 7181
68/70 ... SIX (RHD-10-WPS-LAC) .............. 317 3097
Group 2.003 PULLEY, Fan
67/70 .... SIX (WSBD) ....................... 317 3223
67/ ...... SIX (WDBD-Inner) ................. 317 3223
67/ ...... SIX (WDBD-Outer) ................. 317 4697
71 ....... SIX (WSBD-* 2-23)................. 317 3223
71 ....... SIX (WSBD-* 2-24) ................ 321 3736
72 ....... SIX (WSBD) ....................... 321 3736
67 ....... V8 ............................... 318 6331
68 ....... V8 (* 2-9) ....................... 318 6331
68 ....... V8 (* 2-10) ...................... 319 3354
69/ ...... V8 ............................... 319 3354
* 2-9 - Fan Pulley is 3-1/2 wide.
On 68 01 (V8) prior to Car Sequence No. E-054597;
On 68 10 (V8) prior to Car Sequence No. W-060595;
On 68 30 used prior to Car Sequence No. E-049017;
On 68 70 used prior to Car Sequence No. E-049017;
On 68 80 (V8) prior to W-061846
* 2-10 - Fan Pulley is 2-5/16 wide.
On 68 01 (V8) beginning with Car Sequence No. E-054597;
On 68 10 (V8) beginning with Car Sequence No. W-060595;
On 68 30 used beginning with Car Sequence No. E-049017;
On 68 70 used beginning with Car Sequence No. E-049017;
On 68 80 (V8) beginning with W-061846 Edited by PHAT69AMX - Dec/24/2010 at 2:39am |
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SC397
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Posted: Dec/21/2010 at 7:50am |
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I have added a few more for the latter engines.
'67-'69 290: #3180477 '70-'71 304: #3196924 '72+ 304: #3216083 '67-'69 343: #3181612 '70-'71 360: #3196925 '72+ 360: #3230131 '68-'69 390: #31916189 '70 390: #3196925 (same part number as a '70 360 but balanced differently) '71 401: #3211454 3-bolt(this is according to old information. I have one with no numbers at all on it) '7? 401: #3211454 4-bolt '73/4 401: #3216085 4-bolt Edited by SC397 - Dec/24/2010 at 2:19pm |
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401Ambo
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Joined: Jul/03/2007 Location: Indiana Status: Offline Points: 307 |
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Posted: Dec/22/2010 at 8:44pm |
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Here's a pic of the pulleys:
 The numbers on the pulleys are 3224455 on the taller one and 3216630 on the other. Went into the garage to check the dampers, looks like I'm wrong on that one. The other damper I was looking at was an aftermarket one. Now I can't remember which combo of damper and pulley I'm using.  I think the shorter one came off a '73 401. |
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'72 401 Ambassador wagon
'69 pro-Street AMX AMX/2 (starting soon) |
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addic
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Joined: May/01/2008 Location: Kansas City Status: Offline Points: 370 |
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Posted: Dec/22/2010 at 11:51pm |
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Thanks to all
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amx39068
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Posted: Dec/23/2010 at 6:37am |
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The challenge to 40 year old cars is that you have no idea what someone has done before you got the car or engine. We have a milk crate full of pulleys yet each engine I have done from the stash rather than one that comes directly out of a car and all hooked up requires the engine to be fully assembled and the water pump to be attahced before being able to ensure that the pulleys all line up so each time I do a new engine it is a PITA to get everything lined up.
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Dan Curtis-Owner and CEO AZ AMC Restorations; Facebook: https://www.facebook.com/amcmusclecars/ & Curtis Real Estate Development
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target
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Posted: Dec/23/2010 at 5:57pm |
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So back to the original question. If you have a later 401 that uses a 4 bolt balancer can the balancer off of a 71 model 401 that is a 3 bolt be used on the later 401 without rebalancing?
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amx39068
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Posted: Dec/23/2010 at 7:19pm |
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yes but you need the compatible pulleys
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Dan Curtis-Owner and CEO AZ AMC Restorations; Facebook: https://www.facebook.com/amcmusclecars/ & Curtis Real Estate Development
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PHAT69AMX
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Posted: Dec/24/2010 at 2:33am |
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Unaware if the early 3 bolt and late 4 bolt 401 Dampeners interchange, have the same balance.
Is one of both types on-hand to sit side by side for a visual comparison ? Picture ?
If 1972 was still 3 bolt dampener and was 1st year for Torque Command trans,
then it would be only year with 3 bolt and TC Flexplate with 401 balance where
a 1971 (edit, remove "and '72") 401 3 bolt would have been with a BW Flexplate with 401 balance.
Lack having the 1973-78 Parts Manual to lookup the 4 bolt dampener and pulley part numbers.
If 1972 401 with TC used the same 3 bolt dampener as the 1971 401 with BW,
that would suggest the 3 bolt and 4 bolt 401 dampeners are interchangeable ?
The 1972 Parts Manual shows 71 & 72 401's both use the same dampener
which I guess suggest that the early 3 bolt and late 4 bolt may also interchange.
No intention to dispute, may be wrong, but based on what's in the 67-72 Parts Manual,
1972 was still 3 bolt dampener and short water pump, but 1st year for Torque Command trans.
1973 was the 1st year for the 4 bolt dampener and tall water pump.
Thinking this is why none of the 4 bolt dampener and different pulleys show up in the 67-72 IPM ?
Have a 1973 401, it has 4 bolt Dampener and pulleys, and individual rocker stud heads.
Was bought in 1987ish as a 90k mile complete Ambo wagon and driven home.
Reckon 1973 was last year for individual stud heads, or at least a transitional model year,
but that's an entirely different discussion unrelated to original post in this thread, drifting, oops. Edited by PHAT69AMX - Dec/24/2010 at 7:47am |
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target
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Posted: Dec/24/2010 at 7:37am |
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A phat, that makes sense. The 71 would be the odd ball because of the BW trannie. 72 would probably be the same as later then other than being a 3 bolt. All agree? My 72 model 401 does have a 3 bolt balancer.
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addic wrote: