Re: AMC 6cyl flywheels (more info)

[TABunsey@xxxxxxx]

On November 12, 2004 Tom Jennings wrote:

> I know it was discussed on the list, but I can't figure out
> how to find it via searching:
> 
> Are pre-72 flywheels compatible with post-71 cranks? Clearly
> the block rear face changed, but did crank ends?
> 
> (Can I put a 69 232 flywheel on a 82 258 motor, is the practical
> 
> question.)

The PRACTICAL answer to your question is NO, you cannot.

Randy makes several points concerning compatability of the crank flange and the mounting face of the flywheel, and he is correct that AMC 6-cylinder flywheels are neutral balanced (unlike AMC V8 flywheels), but he either didn't know or forgot one very important point.

The OUTSIDE DIAMETER (and thus the ring gear diameter) is different between 1971 & earlier flywheels and those produced starting in 1972.

The early flywheels are a smaller diameter.
When, for 1972, AMC changed the bellhousing bolt mounting pattern on the 6-cylinder engines, they changed the flywheels also.

If you were to look in the AMC parts book, you would see that the RING GEAR for 1972 & newer 6-cylinder flywheels carries the SAME PART NUMBER as the part number for the V8 flywheels. The 1971 & older 6-cylinder flywheel carries a different number. 

The earlier 6-cylinder flywheels were similar in size to those used in the old 195.6 6-cylinder Rambler (and Nash) engines. These engines never used a clutch bigger than 9-1/8" diameter. The Late AMC 6-cylinder engines came with clutches up to 10-1/2". You simply can't fit the newer clutches onto the older flywheels, even if you were to drill new holes!

Bottom line, you could bolt the 1969 flywheel onto the 1982 crank, but your starter would not mesh with the ring gear.


But, what is your problem that creates your question?
   Late style flywheels aren't hard to find.

If you are planning on puting the 1982 258 in place of a 232 in a 1969 car, your new 258 block won't bolt up to the original 1969 bellhousing. Not to mention that the starter location is different (1971 & earlier is on driver side above crank centerline; and 1972 & later is on passenger side below crank centerline--and exactly where the V8 starter location is) Bolt pattern is different, as I indicated above.

If you want to swap motors, it is best if you swap bellhousings too.
Tom Bunsey

 
> 
> 
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