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1960 Suburban 400

9 posts in this topic

ID: 1   Posted

:thumbs:

I have an opportunity to purchase a K91 T 557290 Spec. NO. 31497A for my 1960 Suburban 400

Is this the correct engine for it?

:thumbs:

Dave

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ID: 2   Posted

going by the manual for the 400 suburban it list only one spec# 31388a but has been wrong before..Someone who knows more about these tractors should be along shortly to clear it all up..

the spec #you listed should be close31497a:

walbro carb

fairbanks morse recoil start

coil magneto ignition

as far as I can tell from the Kohler manual???? :thumbs: :thumbs:

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ID: 3   Posted

My listing agree's with what Mike just said.

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ID: 4   Posted

Both my sources say 31388a as well.

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ID: 5   Posted

I say buy it and use it till you find the correct one, that may take years to find, enjoy it now, it's only a few bolts and most people will never know.

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ID: 6   Posted

I just got back from looking at the motor. Unfortunately it wasn't in the condition as I was told, so I didn't purchase it. I already have some 4HP Kohlers, but this one was supposed to be like new, supposedly never having had gas run through it. Not so!

Most of the four 4HP Kohlers I already own are missing their tins, or don't have the identification tag, so I don't have any numbers to go by. They also have different size diameter crank shafts and different size exhaust port openings.

What would be the correct diameter of the crank shaft and exhaust port opening for a 31388a motor?

Heck, I may have one and not know it. That would be nice.

Thanks to each of you for your help! :thumbs:

Dave

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ID: 7   Posted

Kohler K90/K91 Crankshaft Dimensions, PTO Extension End

3/4" Diameter straight shaft, 2-3/8" long, 3/16" Key-way, with or without a 3/8-24 UNF-2B tapped hole in the end of the shaft.

K91-Crank.png

RE: http://www.mywheelhorse.com/graphics/file/...ence-Manual.pdf

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ID: 8   Posted

The exhaust port for a 400 Suburban K91 would be tapped 3/4-14 NPT without mounting studs. The majority of K91s you will find (non- :thumbs:) will have untapped ports and two exhaust studs.

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ID: 9   Posted

Wow! Thanks Mike and Vince. You guys are good!

:thumbs: I just checked my motors and the dimensions lead me to believe that one of them is the correct motor. :thumbs:

I appreciate you all very much.

Dave

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