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amc engine

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amc engine

Post  stephenhopleyWS9 on Wed Apr 11, 2018 4:08 am

I am in the process of rebuilding the AMC 250 T engine on a 61/62 80 cruiser and I understand that there should be a shim fitted between engine and gearbox. Any ideas what size etc and where they can be obtained

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shim

Post  piston 197 on Wed Apr 11, 2018 6:01 am

The shim is to space the gearbox away from the crankcases to ensure correct tensioning of the primary chain, whether you will need a shim or how thick the shim will require to be will be down to a combination of manufacturing tolerances and your chain, with a new primary chain the engine may require no shim, or may need more than one ? best way is to check primary chain tension before stripping clutch and gearbox , if it was ok as it was leave alone, if chain is slack, shim or shims will need to be added?
Shim stock can come in sheets of various thicknesses from .001" to .025" or more see Ebay item 201232091921 , it can be cut to size/shape with a good shears or strong scissors.
JH
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Re: amc engine

Post  stephenhopleyWS9 on Wed Apr 11, 2018 6:17 am

thanks.

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Shims

Post  kerabo on Wed Apr 11, 2018 7:34 am

There are some shims to tension the primary chain. I made some myself to get it exact. Remember to have a new chain and good sprockets or if you ever need to change it you won't get your chain on.
If you just fit he clutch without the casings while adjusting it saves work. And remember to seal the last shim next to the gearbox.

Ken
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Re: amc engine

Post  stephenhopleyWS9 on Wed Apr 11, 2018 7:52 am

thanks it would be far easier if the chain was adjustable but no doubt down to cost at the time from the pics I have seen looks like the the gearbox has to be removed each time to facilitate the fitting of shims.

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Chain

Post  kerabo on Wed Apr 11, 2018 8:19 am

No it should be a one time only adjustment.
It will be a long time before its slack enough to give concern and if it does you can fit a new chain in place.
Just get it correct and forget it.
You will be supprised what difference just a thin shim makes.

Ken
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