400 amp alternator replaceable bearing?

[Mattguy]

My M1151 has a wobbly clutch pully and its making horrible noise. I see a bearing listed for the 200amp alternator, but was wondering if the same bearing can be replaced on the 400amp alternator. Looking for a replacement the cheapest I could find was $461 at mac motors.

 

[87cr250r]

From the picture it looks like you may be able to push the shaft out of the center, flip it over, and push the bearing out of the pulley.

 

[springer1981]

I'd try replacing it using any method possible, worst case you still need a new one. As my signature says "If it doesn't fit, force it. If it breaks, it needed to be replaced anyway".

 

[87cr250r]

Once you get it apart, measure in mm and we'll likely be able to help you find the replacement bearing. A good quality bearing in that size will be around $15-25.

 

[Mattguy]

Once you get it apart, measure in mm and we'll likely be able to help you find the replacement bearing. A good quality bearing in that size will be around $15-25.

Will Do! Thanks!

 

[Mattguy]

Finally got time to pull my pulley off and it's not even a clutch pulley for my 400 amp alternator. I'm wondering if this was changed out at a point? Should I replace with same or look for correct clutch pulley?

Sent from my SM-S901U using Tapatalk

 

[Gcelevator]

Finally got time to pull my pulley off and it's not even a clutch pulley for my 400 amp alternator. I'm wondering if this was changed out at a point? Should I replace with same or look for correct clutch pulley?

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I am not 100% sure, but i believe the 400 amps generator is a no clutch pulley vs the 200 amp clutch pulley. Just checking both as i have them, also the 200 amps pulley seems to be bigger in diameter than the one in the 400 amps. Once again, this is a vissual assumption on the diameter.

 

[Mogman]

Some do some don't have the clutch pulley, IIRC they are about $5-700 bucks for one

I am not 100% sure, but i believe the 400 amps generator is a no clutch pulley vs the 200 amp clutch pulley. Just checking both as i have them, also the 200 amps pulley seems to be bigger in diameter than the one in the 400 amps. Once again, this is a vissual assumption on the diameter.

The reason the 400A pulley is smaller is because they are overdriving the crud out of it so it will produce as much as possible at near idle, not good for the alt and not good for fuel economy, those trucks were meant to basically sit in one spot being a power source.
That and a couple other reasons many dump the 400A and fit a 200A unit.

 

[Gcelevator]

Some do some don't have the clutch pulley, IIRC they are about $5-700 bucks for one

The reason the 400A pulley is smaller is because they are overdriving the crud out of it so it will produce as much as possible at near idle, not good for the alt and not good for fuel economy, those trucks were meant to basically sit in one spot being a power source.
That and a couple other reasons many dump the 400A and fit a 200A unit.

Yes, the are pricey, that is the reason i was asking on another thread about a fix for the clutch. I would not mind installing a 400 amps pulley on my 200 amps spare. Better than paying premium for the clutch pulley in my opinion.

 

[coachgeo]

Yes, the are pricey, that is the reason i was asking on another thread about a fix for the clutch. I would not mind installing a 400 amps pulley on my 200 amps spare. Better than paying premium for the clutch pulley in my opinion.

what activates the clutch? Is it electrical clutch?? if so is there sensors that when alt. to hot.... or draging engine down at bad times (say acceleration?) where clutch gets deactivated? Or is it a clutch just to prevent reverse direction like on some Air. Con compressors??

 

[Mogman]

Yes, the are pricey, that is the reason i was asking on another thread about a fix for the clutch. I would not mind installing a 400 amps pulley on my 200 amps spare. Better than paying premium for the clutch pulley in my opinion.

Why would you want to overdrive your alt? they make regular size non clutch type pulleys for the 200A some have the freewheeling clutch and some don't.

 

[Mogman]

what activates the clutch? Is it electrical clutch?? if so is there sensors that when alt. to hot.... or draging engine down at bad times (say acceleration?) where clutch gets deactivated? Or is it a clutch just to prevent reverse direction like on some Air. Con compressors??

It is an overruuning clutch so when you shut the motor off the alt freewheels and does not cause the belt to squeak, it is automatic requiring no control or electricity

 

[Mogman]

The undersize pulley also causes an error in the tach if you have one.

 

[Retiredwarhorses]

Either Pulley is correct, but the pulley dictates the correct length belt…the belt for the solid pulley is not Easily sourced.

 

[Gcelevator]

Why would you want to overdrive your alt? they make regular size non clutch type pulleys for the 200A some have the freewheeling clutch and some don't.

I would like to come accross one of those at a decent price.