351447 20HP end bolt help

[Repsol1k]

I’m doing a motor swap in an older Argo. Put in a Briggs and Stratton 20hp vanguard v-twin. 351447 1064 E1

The motor had a tapered shaft and was hooked up to a generator. I cannot find what end bolt size I need.

I have tried 5/16-18 and 5/16-24 both don’t thread correctly. Tried an M8-1.25 and no go.

Does anybody know what bolt size is needed?

 

[StarTech]

Should be 3/8"-24 (0.375-24 UNF) or at least that's what the 807778 crankshaft used. The newer 809842 crankshaft I don't have info on but it should be the same.

 

[Auto Doc's]

Hello Repsol1k,

These shafts were designed specifically for generator application.

What is "an older Argo". I'm not familiar with that brand.

Did the old engine have a tapered shaft and the same diameter?

Just on a guess the thread will likely be a regular 3/8X24 thread.

 

[Repsol1k]

Hello Repsol1k,

These shafts were designed specifically for generator application.

What is "an older Argo". I'm not familiar with that brand.

Did the old engine have a tapered shaft and the same diameter?

Just on a guess the thread will likely be a regular 3/8X24 thread.

Hey, the shaft was tapered and I had a machine shop turn the shaft into a keyed 1 inch diameter for the clutch plate

1980 Argo 8x8 off road vehicle

Tried a 3/8x24 and it was to large

 

[StarTech]

Sorry the 807778 is straight PTO but that's what the IPL showed.

Apparently someone swapped crankshafts, here is a couple of the Taper shafts used in the 351400 series.

 

[Repsol1k]

Sorry the 807778 is straight PTO but that's what the IPL showed.

Apparently someone swapped crankshafts, here is a couple of the Taper shafts used in the 351400 series.
View attachment 70919View attachment 70920

This is amazing thank you!

 

[Repsol1k]

Sorry the 807778 is straight PTO but that's what the IPL showed.

Apparently someone swapped crankshafts, here is a couple of the Taper shafts used in the 351400 series.
View attachment 70919View attachment 70920

I’ve tried both of these bolts with no luck. Any other suggestions?

Thinking I might have to pull the motor and have something new drilled and tapped.

 

[Auto Doc's]

Hey, the shaft was tapered and I had a machine shop turn the shaft into a keyed 1 inch diameter for the clutch plate

1980 Argo 8x8 off road vehicle

Tried a 3/8x24 and it was to large

I think the machine shop would be the best folks to ask. The current threads at the tip may be blunted and currently not allowing a bolt to start into the threads

 

[SeniorCitizen]

Size a wood dowel that will screw into the hole by measuring the ID of the hole and add 0.020" . Then you can get a better idea of threads / inch and diameter to determine if its imperial or metric .