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Old 02-15-2020, 04:19 PM   #1
Art Newland
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Default engine is a quandary

This engine is a quandary to me. Pistons measure standard but compression ring gap is about .125Ē. Pistons fit snug in the bores but rings are stuck/glued in the lands. I can hardly catch the ridge with a fingernail, valves and seats (all have seats) look really good, intakes could literally be just put back in and used, exhausts need a slight touch-up. Valve galley is really sludged up. I donít have the bottom end apart yet but sure donít see anything catastrophic yet. It has all the indications of being low mileage but sure is gunked up. Rod bearings show standardÖ Iím just waiting for the hammer to drop as why this engine was taken out of service.
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File Type: jpg gunky valley.jpg (80.5 KB, 92 views)
File Type: jpg gunky piston.jpg (49.4 KB, 91 views)
File Type: jpg valve faces.jpg (40.6 KB, 84 views)
File Type: jpg valve in block.jpg (77.0 KB, 85 views)
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Old 02-15-2020, 04:25 PM   #2
19Fordy
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Default Re: engine is a quandary

Cracks?
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Old 02-15-2020, 04:31 PM   #3
Art Newland
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Default Re: engine is a quandary

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Cracks?
Nothing I can see at this point. Doesn't even have the "normal" cracks from cooling holes to head bolts.
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Old 02-15-2020, 04:38 PM   #4
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Default Re: engine is a quandary

I must be missing something here. How did you get the pistons out without having "the bottom end apart yet"?
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Old 02-15-2020, 04:45 PM   #5
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Default Re: engine is a quandary

The valley isn't as. Bad as most worn old oil engines I've disassembled. I hope it's a good mtr for you . Old rering jobs were done with what ever parts were available. Esp when $ were hard to come by .
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Old 02-15-2020, 04:48 PM   #6
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Default Re: engine is a quandary

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I must be missing something here. How did you get the pistons out without having "the bottom end apart yet"?
Unfortunately, the guy I bought it from gave a piston/rod assembly to a buddy, that needed it. They pulled #2 and #6, #6 was laying in the valve galley... That's left that jounal slightly rusty. Plan is a Merc crank anyway.
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Old 02-15-2020, 07:24 PM   #7
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Default Re: engine is a quandary

I may have a spare std piston hanging around if you were to rering and clean up .
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Old 02-15-2020, 07:49 PM   #8
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I may have a spare std piston hanging around if you were to rering and clean up .
Thanks for the generous offer, I'll keep it in mind.
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Old 02-15-2020, 09:48 PM   #9
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Default Re: engine is a quandary

Hi Everyone. Art Newland, thanks for the post. That valve valley is so typical.
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Old 02-15-2020, 09:55 PM   #10
Art Newland
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Default Re: engine is a quandary

Who said I wouldn't take it all apart?
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Old 02-15-2020, 11:47 PM   #11
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Who said I wouldn't take it all apart?
Yup, That's on me. Not reading carefully. I suggested it would have to come apart. Then I saw a new crank was coming. Egg on my face.
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Old 02-15-2020, 11:51 PM   #12
51 MERC-CT
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Default Re: engine is a quandary

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This engine is a quandary to me. Pistons measure standard but compression ring gap is about .125”. Pistons fit snug in the bores but rings are stuck/glued in the lands. I can hardly catch the ridge with a fingernail,
It should be obvious that the rings have worn appox. .040 dia. to give the .125 end gap condition with minimum wear on the cylinders.
Sounds like it could be a candidate for a rebuild like we used to do on a regular basis back in the day. Clean up,check dim's, hone and replace all bearings and rings etc.etc.
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