Starter shims.... '86 Blazer K5 305,AOD - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 02-12-2006, 05:26 PM
adam7985
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Starter shims.... \'86 Blazer K5 305,AOD

Tried search, tried my manuals, tried my books, but I just can't seem to find much of anything out about starter shims. Changed the starter on my 'new' 1986 Blazer (305, AOD) the other day. There was one shim in there the way I got it, so I cleaned it up and reinstalled it with the next starter. Have a bit of that high pitched whine when it's cranking and some kind of a clunk just before the engine fires up. Anyone have any tips on getting this right? Trial and error or is there a science to this? Guess I just lucked out in the past and never had to worry about this on any of my GM vans or cars.
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post #2 of (permalink) Old 02-12-2006, 07:19 PM
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Re: Starter shims.... \'86 Blazer K5 305,AOD

starter shims. on some motors you need them.

sounds to me like the gears are too close together. add another shim. that whine could be the gears eating each other and the cluck is prob the gear binding or being thrown back into the starter as the motor starts and spins the little gear faster than the starter.

both ways, unless you add some shims your flywheel and or starter will not last long.
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post #3 of (permalink) Old 02-13-2006, 09:01 PM
adam7985
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Re: Starter shims.... \'86 Blazer K5 305,AOD

Thanks MouseMotor! Found a packet of starter shims along with an instruction sheet. Pack includes a "feeler rod" (think it was 1/8") to place between the armature shaft and the flywheel to check the clearance. Soon as I straighten out my wiring issues I hope to fix this shim situation.
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