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90 amp bolt in alternator on an L-series motor


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#241 datzenmike

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Posted 19 April 2017 - 11:21 AM

Room is at  a premium on the 520/521 and the 620 trucks. If you got the urge gato, re mount it on the distributor side where there's tons of room. There are threaded bolt holes over there. Just make a custom mount for it.


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#242 flatcat19

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Posted 19 April 2017 - 11:37 AM

I think I'll be fine. Not worried.

You can't hang if your nuts haven't dropped...it's physics


#243 datzenmike

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Posted 19 April 2017 - 03:15 PM

Truck alternators are small. Higher output are larger and hit the grease fitting on top of the idler arm.


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#244 flatcat19

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Posted 19 April 2017 - 03:17 PM

I have a KA alt already. There is barely a difference in size between the two. I had plenty of adjustment to go with the 620 alt.


I'll report back when installed.

You can't hang if your nuts haven't dropped...it's physics


#245 Charlie69

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Posted 19 April 2017 - 09:16 PM

Truck alternators are small. Higher output are larger and hit the grease fitting on top of the idler arm.

Not if you run a 1980 to 1986 720 chassis under your truck.  The steering gear box and the idler arm are on the outside of the frame making more room for alternators and AC compressors.


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#246 flatcat19

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Posted 19 April 2017 - 09:18 PM

Then bring a 720 frame up here and get this 521 finished!!!

You can't hang if your nuts haven't dropped...it's physics


#247 datzenmike

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Posted 20 April 2017 - 05:52 AM

Not if you run a 1980 to 1986 720 chassis under your truck.  The steering gear box and the idler arm are on the outside of the frame making more room for alternators and AC compressors.

 

 

These two poets go together....

 

 

Room is at  a premium on the 520/521 and the 620 trucks. If you got the urge gato, re mount it on the distributor side where there's tons of room. There are threaded bolt holes over there. Just make a custom mount for it.

 

 

Truck alternators are small. Higher output are larger and hit the grease fitting on top of the idler arm.

 

The 720 truck alternators are like the larger diameter '70s Datsun car alternators. 50/60 amp output. I've tried both in a 620, they are not a good fit. By the time you get it positioned where you can swing it to tighten the belt it hits things. Had to install shorter belt first then mount the alternator. The KA alternator did look slightly smaller but I have not tried it in a 620 only my 710 sedan. I think they are 80 amp.


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