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Old 11-14-2017, 08:25 PM   #361
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So the engine has been running great (off one cylinder only). I We took the piston out of the non-working cylinder today and discovered 2 scratches on the bore running lengthwise with the cylinder. This is where we are losing our compression. After further inspection we noticed the wrist pin was sticking out slightly on one end...the same side as where the cylinder bore scratches were! The left and right (0 and 180) edges of the wrist pin were dragging along the cylinder wall.

So, I bought new rings, re-honed with a flex-hone, ran in the engine with it belted to our lathe, and put it all back together. We are still losing compression but it may fix itself over time...I'm not sure.

I may have to take the entire engine apart and have that one "bad" cylinder bore professionally honed slightly larger. BUT, I may have to make a custom Piston to chase the difference.

Any tips and tricks to share with us will be greatly appreciated!


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Old 11-14-2017, 11:49 PM   #362
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So the engine has been running great (off one cylinder only). I We took the piston out of the non-working cylinder today and discovered 2 scratches on the bore running lengthwise with the cylinder. This is where we are losing our compression. After further inspection we noticed the wrist pin was sticking out slightly on one end...the same side as where the cylinder bore scratches were! The left and right (0 and 180) edges of the wrist pin were dragging along the cylinder wall.

So, I bought new rings, re-honed with a flex-hone, ran in the engine with it belted to our lathe, and put it all back together. We are still losing compression but it may fix itself over time...I'm not sure.

I may have to take the entire engine apart and have that one "bad" cylinder bore professionally honed slightly larger. BUT, I may have to make a custom Piston to chase the difference.

Any tips and tricks to share with us will be greatly appreciated!

What's the bore size and cylinder length. I might be able to hone the cylinders if not to large or long.


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Old 11-15-2017, 03:02 AM   #363
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Hi Steve...I'll double check in the AM. The pistons are from a Maytag Model-92 gas engine....length about 6 to 8 inches I'm guessing. Again, I'll double check...thank you!
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Old 11-16-2017, 03:56 AM   #364
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Hi,
Just an Idea to find the compression leak Put the cylinder with the leak on top dead centre with both alves closed and prssurise the cylinder through the spark plughole and see where the leak is coming from. Some oil in the cylinder will show up the leak. Cheers and keep up the great work.
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Old 11-17-2017, 01:33 PM   #365
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Hi,
Just an Idea to find the compression leak Put the cylinder with the leak on top dead centre with both alves closed and prssurise the cylinder through the spark plughole and see where the leak is coming from. Some oil in the cylinder will show up the leak. Cheers and keep up the great work.
John Samphier
Thanks John...but all the air leaks past the 3 piston rings due to those two horizontal scratches. I thought the flex-hone would work but it didn't...air still leaks. I have to have it professionally honed and may have to make a bigger piston now...not sure. Thanks though!
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Old 11-17-2017, 06:12 PM   #366
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A friend has had good success with scored small engine cylinders by filling the grooves with J B Weld, then sanding to match the surrounding metal. Might be worth a try before doing something more involved.
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Old 11-18-2017, 02:18 PM   #367
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What's the bore size and cylinder length. I might be able to hone the cylinders if not to large or long.
Hi Steve...sorry for the late response. The bore size is 2-1/2" with a length around 8 to 8-1/2". We are testing the engine on gasoline next week...if the other cylinder fires we might be good to go....but I'll keep you in mind.

Thanks again...this 5 year project was supposed to be done 2 years ago, lol
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Old 11-18-2017, 04:51 PM   #368
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this 5 year project was supposed to be done 2 years ago, lol
So you are right on schedule. Hahaha!!


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