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1965 Kohler 6.5R22 to be Placed into Service


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  #31  
Old 07-06-2018, 02:37:56 AM
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Default Re: 1965 Kohler 6.5R22 to be Placed into Service

Looks like where the oil ring traveled to and wore the cylinder?
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Old 07-06-2018, 03:23:03 AM
Vanman Vanman is offline
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Default Re: 1965 Kohler 6.5R22 to be Placed into Service

I'm not sure. I was planning on taking some measurements to see what it lines up with. If the compression rings don't go past it, maybe I'll just run it. But the stroke is 2-3/4", so I think all of the rings are going past it. It doesn't look that far down to me. Maybe it is a point where the piston has been rocking back and forth ~mid stroke.
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Old 07-06-2018, 07:08:39 AM
G Sams G Sams is offline
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Default Re: 1965 Kohler 6.5R22 to be Placed into Service

Although far from ideal, since it has good compression I'd use it as is with the grooves.
You'll want to install a thermostat to control wear and for heat.
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Old 07-06-2018, 07:44:35 PM
Bent Trigger Bent Trigger is offline
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Default Re: 1965 Kohler 6.5R22 to be Placed into Service

Hi Keith, after looking at the video I would say the indentations in the cylinder walls is not going to be a problem for this non-Nascar motor!
Being EXTREMLY CAREFUL REMOVING THE RINGS!! (Ask me how I KNOW)With the rings off the piston place them in the cylinder and measure the gap. Should be .007 to .017, the manual specifies the same number for all three rings, top middle and oil. I think this motor even with the bearing looking this way will function for a long time. The grooves in the bearings are from something in the oil being pumped into the journals. There are no noticeable grooves or scratches on the crank surfaces? Not changing the oil or as you mentioned the guy started it with milky oil. With a very good cleaning I think it will continue to function without heat build up at those bearings. I also think that is a last resort. Try to find some bearings or check google for a bearing manufacturer. They are cheaper than you think in some aspects. (PEICE OF MIND) Chris PS HAPPY INDEPENDENCE DAY!!
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Old 07-06-2018, 08:12:14 PM
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Default Re: 1965 Kohler 6.5R22 to be Placed into Service

Thanks guys, you're making me feel better about it's prospects.

I found the bore gauges, but I'm not sure about some piston ring pliers... There've been so many moves and rearrangements lol. I guess I can buy some cheapies to get me by for now. I'm a little nervous about breaking the rings...

It reached 112 today, and it's *down* to 110 right now, so it's going to have to wait.
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Old 07-06-2018, 08:32:19 PM
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Default Re: 1965 Kohler 6.5R22 to be Placed into Service

Quote:
Originally Posted by Vanman View Post
Thanks guys, you're making me feel better about it's prospects.

I found the bore gauges, but I'm not sure about some piston ring pliers... There've been so many moves and rearrangements lol. I guess I can buy some cheapies to get me by for now. I'm a little nervous about breaking the rings...

It reached 112 today, and it's *down* to 110 right now, so it's going to have to wait.
Over at the coast from you in the Paso Robles area, it is 110*. My JB ready to go if the power goes down. Must have the AC.
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Old 07-07-2018, 08:53:19 AM
Bent Trigger Bent Trigger is offline
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Default Re: 1965 Kohler 6.5R22 to be Placed into Service

Try these Keith, I have used them with good success. Although there are only 2 sets left of the rings .Chris
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Last edited by Bent Trigger; 07-07-2018 at 09:25:38 AM.
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Old 07-07-2018, 11:36:11 AM
Newoldstock Newoldstock is offline
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Default Re: 1965 Kohler 6.5R22 to be Placed into Service

Quote:
Originally Posted by Vanman View Post
I'm not sure. I was planning on taking some measurements to see what it lines up with. If the compression rings don't go past it, maybe I'll just run it. But the stroke is 2-3/4", so I think all of the rings are going past it. It doesn't look that far down to me. Maybe it is a point where the piston has been rocking back and forth ~mid stroke.
The human eye can detect a defect in a surface finish down to the 1/10,000.
Sometimes what see is much worse than what you think

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Originally Posted by Bent Trigger View Post
Try these Keith, I have used them with good success. Although there are only 2 sets left of the rings .Chris
If you email a ring manufacturer often they can match a set.
Rings sets are more standard than we often realize.

I remember this Lister my old man had.
You could net get rings for it from LP, he matched up a set like that. ( this is back in the day before the internet and he talked to a real person on a real phone how quaint eh ? )
I think he had to get ring lands recut on the oil control for some reason because they were a different design but it all worked out in the end...
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Old 07-13-2018, 08:22:07 PM
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Default Re: 1965 Kohler 6.5R22 to be Placed into Service

Got a little break from the heat, and a little time this afternoon to look into the cylinder grooves. Here's what I have found.

1) They are present in all cylinders, and all are around 1-1/2" down from the top. This is right close to 1/2 of the 2-3/4"stroke, the place where an inline four will always naturally stop. I think water sat in the bores for a while, and this is the rust line.

2) The most prominent grooves go all the way around the cylinder circumference, and are around 1/4" wide.

3) I don't really have very good tools for measuring bores, especially small ones, but I measured the worst looking one at around 2.631", .006" over.

4) Measuring the cylinder near the top puts it pretty much right at spec at 2.625".
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Old 07-13-2018, 09:57:02 PM
Bent Trigger Bent Trigger is offline
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Default Re: 1965 Kohler 6.5R22 to be Placed into Service

Keith, if you cant find the oversize, what are you going to do? I would get it running and check all other things. After 6-8 hrs of run time pull the head and re-measure. If it can run for 6-8 hrs I would call it good. It will be unlikely that it will die from a little oil or loss of compression for a loooong time. In the mean time you can source another motor possibly. When I get a used bike I try to make it perfect in the piston ,bearings and seals. This is not always possible (unobtainable). Move forward and don't sweat the stuff you cannot fix. A generator in a million pieces is a waste. Any motor that runs is better than a wish that locks you down. Your time and energy are worth more than the search and rescue of a generator. These problems can take a long time to remedy. As always take what I say with a grain of alcohol. I Have!!Chris
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