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1965 Kohler 6.5R22 to be Placed into Service


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  #21  
Old 06-28-2018, 12:22:13 AM
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Default Re: 1965 Kohler 6.5R22 to be Placed into Service

Looks good Keith. Funny to see the crank main bolts safety wired. What did Kohler expect, the bolts to back out at a whopping no load 1860 RPM?
Personally, If you have it this apart, I would pull each piston to check the rings and making sure they are not worn or worse yet, stuck. I would at least lap the valves.
The engine reminds me of the little 134 ci flathead in my 1939 Willys pickup.
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Old 06-28-2018, 01:11:00 AM
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Default Re: 1965 Kohler 6.5R22 to be Placed into Service

Yes, I agree about checking the pistons and rings. I can check the wrist pins for looseness at the same time. I want to look at the bearings and crank anyway.

It was making 18 lbs oil pressure at cranking speed right before I took it apart so I'm cautiously optimistic that the bearings are all fine.

I'm a bit nervous because I *thought* I *might* have heard a slight knock the last time I gave it a good run. Between the carbon build up and the crap in the water jacket it may have just been a little spark knock.

The wired bolts are pretty funny. I've never seen that in person before. Only in pictures of aviation stuff. But I'll put them back.
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Old 06-28-2018, 01:26:36 AM
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Default Re: 1965 Kohler 6.5R22 to be Placed into Service

Plastigauge the rods and mains. You can check the journals for roundness with a good micrometer. Look over the cam lobes real good and see if any of the followers are dished out where the cam meets. If you have to remove the cam, make sure you keep each lifter with each cam lobe.
Flathead, water cooled engines will sound a little "Knocky" when running. They were built with more clearances than late model engines.
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Old 06-28-2018, 06:33:48 AM
Bent Trigger Bent Trigger is offline
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Default Re: 1965 Kohler 6.5R22 to be Placed into Service

Keith, that pan and motor internals are gonna need some cleaning. Good job on getting it apart with no damage. Chris
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Old 07-01-2018, 01:04:32 AM
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Default Re: 1965 Kohler 6.5R22 to be Placed into Service

Made some more headway tonight, and made some somewhat disconcerting discoveries, but could be worse.

Pulled the pistons, rods, and crank. The crank looks pretty good, and mics pretty good too. The center main is maybe borderline.

Considering the condition of the #1 and #4 rod bearings, the corresponding journals look great!

I wonder if these bearings are a common, standard part.

I'm thinking to micropolish the crank and throw in a new set of bearings.

I haven't checked any of them for clearance yet, and they all look good other than those two... If they're expensive I'd check the others and see about keeping them I suppose...
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Old 07-01-2018, 01:17:59 AM
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Default Re: 1965 Kohler 6.5R22 to be Placed into Service

The first photo is the #1 rod journal. This bearing is the worst looking one, though #4 is bad too. Don't mind the bug stuck in the oil...

The second photo is the #2 and center main. The bearings for these look good, and I think the journals would look good too, with just a micropolish.
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Old 07-01-2018, 07:02:17 PM
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Default Re: 1965 Kohler 6.5R22 to be Placed into Service

Man those rod bearings look like crap... I wonder if it was dirt or the rods are bent.
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Old 07-01-2018, 07:11:36 PM
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Default Re: 1965 Kohler 6.5R22 to be Placed into Service

I think it was water in the oil. When I bought it the oil was very milky, and the seller had demonstrated it running. I changed the oil after I got it home, but evidently that was too late.

All of the other bearings look good. I'd better look at the cam and it's bearings too.

I was hoping to find that Kohler used off the shelf bearings, but I have yet to find any cross reference to the Kohler part number.

Beyond that, what to do? Pour babbit I guess...
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Old 07-02-2018, 01:53:10 AM
Birken Vogt Birken Vogt is offline
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Default Re: 1965 Kohler 6.5R22 to be Placed into Service

There has to be a hot-rod company that can make custom bearings for that, looks fairly straight forward.
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Old 07-06-2018, 02:33:30 AM
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Default Re: 1965 Kohler 6.5R22 to be Placed into Service

Here's a video sort of summarizing what I've done and found thus far.

Take a look at those bores. That's a pretty odd wear pattern. Looks sort of like a circumferential groove around ~1-1/2" down from the top. It has me more concerned than the bearings did. It was hard to get good still shots of it, but it shows up very well in the video.

https://youtu.be/AVwZaw2gN8Y
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