MERCURY MARK 55 PISTONS

[jeff-register]

I was fearing that the costs would be expensive. Problem is most good used parts are very hard to find. Be patient & keep the search up, something will turn up. Only guy I know to ask is Dave Bernard, he has been my friend for over 10 years & knows old Merc’s very weii. He has a friend Bob Grubb that they worked together on Merc’s for years. Call Dave & tell him I sent you 914 310 7086, he is in New York, nice guy. I too think Doug Penn although he likes OMC & very old motors. He is on the web too. Just thought of another guy, Dan Gano 712 336 3297, he might have a sourse too, I hope he still has the same number or try the web. I will keep trying to help you too. Don’t give up, they are oout there  somewhere!!

Jeff

[opposedtwin]

Dan Gano retired and sold his business. Mot sure if the new owners are selling parts or not.

Anyone know?

[Pondrocket]

1st thing get numbers from all 4 cylinders see how far out of spec. Need to know if there are any large gouges. Once we see all numbers suggestions will come…

Travis

[modhydro]

Try Alan or David at Aeroliner. they have reproduced them for the D class the the NBRA.

[green-thumbs]

ouis

[jeff-register]

Jay,

I remember reading about aircraft radial motors from the 40’s. No pistons were available so they took the cylinders & had them plated in the bore, then rebored to fit the old pistons matching pistons to each cylinder to complete the refirbish. The engines, Pratt & Whitney motors 1200hp passed FAA inspections & now in the air again. Another possabilty maybe?

Have you had any luck on E Bay?

[jeff-register]

Try Otto gas engine works.com

[labrador-guy]

I would suggest that you look for a used power head.   Resleeve  the bore would be expensive, custom pistons expensive too.   Unless you are a machinist with a million dollar CNC machine you have a long row to hoe!

dale

[jeff-register]

Labador Guy,

I agree with you but parts are getting hard to find. I want a KH7 shift seal & been looking a very long time. Anyone know where to get a new one? Using a Mark 25 gearcase on a KH7 &  the mk seal is too wide to fit.

[labrador-guy]

jeff-register wrote:

Labador Guy,

I agree with you but parts are getting hard to find. I want a KH7 shift seal & been looking a very long time. Anyone know where to get a new one? Using a Mark 25 gearcase on a KH7 &  the mk seal is too wide to fit.

You can get any seal by size.  Somebody on this site will post a chart for ID/OD and width.   You just need to be able to measure accurately.   Sometimes it might take a couple tries and a few extra dollars but it can be done!

dale

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