Torque of alternator rotor nut

jms

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• May 16, 2024

• #1

So just having installed an RGM Atlas belt drive, the question comes up as to how to apply 70 lbs of torque to this nut. I’m thinking that amount applied to a 20mm belt may not be good for it. Thoughts?​

 

S

SteveBorland

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• May 16, 2024

• #2

I think the belt has to transmit rather more than 70 ftlbs when running?

 

kernel65

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• May 16, 2024

• #3

it’s no problem

 

Schwany

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• May 17, 2024

• #4

I'll +3 that.

I've done it 3 times with a 20mm RGM belt and 2 times with a 25mm belt. I did not have any problem with the belts.

 

M

mdt-son

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• May 17, 2024

• #5

jms said:

So just having installed an RGM Atlas belt drive, the question comes up as to how to apply 70 lbs of torque to this nut. I’m thinking that amount applied to a 20mm belt may not be good for it. Thoughts?​

Click to expand...

Gents, torque is measured in lbf-ft. A toothed belt transmits a static tensile force, not a torque. Using common belt parameters for a Norton, 70 lbf-ft equates to about 500 lbf of tensile pull at the belt.

- Knut

 

concours

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• May 17, 2024

• #6

Simply use a wooden block between a tooth and a stationary point.

 

Schwany

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• May 19, 2024

• #7

concours said:

Simply use a wooden block between a tooth and a stationary point.

Click to expand...

I wonder if that would work with a belt pulley. The teeth are kind of shallow in depth. I am not knowing.

Much easier to use a clutch locking tool with the belt on both the engine and clutch basket.

 

Last edited: May 19, 2024

kernel65

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• May 20, 2024

• #8

I have used both the clutch tool and putting in gear/apply rear brake method.

 

Hortons Norton

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• May 21, 2024

• #9

Just finished putting mine back together after changing the main seal, I to kinda cringe thinking it going to slip a tooth. It's never had a problem doing it that way.

 

jms

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• May 23, 2024

• #10

Just back from vacation. Thanks all

 

concours

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• May 24, 2024

• #11

Schwany said:

I wonder if that would work with a belt pulley. The teeth are kind of shallow in depth. I am not knowing.

Much easier to use a clutch locking tool with the belt on both the engine and clutch basket.

Click to expand...

Well, wonder if you must.

Meanwhile, I work on this type of belt drive regularly.