Duramax Diesels Forum Truck of the Week
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Old 05-29-2007, 03:26 PM
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Default Crankshaft Pulley Keyed?

Could somebody tell me if LLY Crank Pulley is keyed or just a Press fit like alot of engines seem to do these days. Appreciate info and hope somebody gives me good news and says it has keyway - Mick
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Old 05-29-2007, 03:48 PM
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mick i am 99.9% sure it is keyed, if not the crank pully could rotate on the shaft, i even think there have been problems of people not getting their pully tight enough and sheering the pin off
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Old 05-29-2007, 03:57 PM
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Last edited by mick; 05-29-2007 at 04:02 PM.
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Old 05-29-2007, 03:59 PM
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BFJ Thanks.I'm hoping so - if not bit of machine work to fix it so I can run S/C pulley. My manual shows pic of it but doesn't show keyway. There are a few around now that will know for sure and will chime in -
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Old 05-29-2007, 05:13 PM
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There just a pin in the snot to drive it. The pulley just slips on. The BMF bolt holds it all on.
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Old 07-10-2007, 09:53 AM
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Well that's gay!! No wonder they shear occasionally. Anyone know what the torque is on that BMF bolt!! Is it Right hand or Left hand thread?
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Old 07-13-2007, 04:15 AM
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Bolt is standard right hand thread. Get the biggest cheater bar you can, then go get another a bigger one. Then use them both. My 3/4" impact won't phase it.

I think the official torque spec is one bazillion ftlb's, but I think they are tighter than that.

Do not reuse crank bolts. Ever. These are always to be replaced on modern GM engines when removed.

And yes, the LB7/LLY/LBZ crank is pin'd with a Walmart Quality extra-dainty pin. Cheap bastards.
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Old 07-13-2007, 03:04 PM
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Quote:
Originally Posted by McRat View Post
Bolt is standard right hand thread. Get the biggest cheater bar you can, then go get another a bigger one. Then use them both. My 3/4" impact won't phase it.

I think the official torque spec is one bazillion ftlb's, but I think they are tighter than that.

Do not reuse crank bolts. Ever. These are always to be replaced on modern GM engines when removed.

And yes, the LB7/LLY/LBZ crank is pin'd with a Walmart Quality extra-dainty pin. Cheap bastards.
Thanks for that. I'll be taking mine off LB7 engine next week
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