QD-19

[James Calamon]

Have a question for those that know this motor better than I. I found No 2 cylinder had the rings stuck and the poston sides have considerable scratching, so I’m replacing them. What I need to know is No 1 had no damage at all, rings free, piston clean, can I reuse the piston and rings or should I replace the rings?

• This topic was modified 4 years, 4 months ago by James Calamon.

[labrador-guy]

James If it were mine I would want the compression to be equal as I could get it. So I would replace rings on both pistons. Remember to cut the glaze on the cylinders before reassembly. You can do that with some medium sandpaper. Use a twisting motion in and out with some WD40 or any other light cleaning fluid. You need to make a cross hatch texture on the cylinder walls so the rings will seat. Wash the power head after sanding and blow dry it with compressed air.

dale

get’em wet…..don’t let’em set!

[Bob Wight]

James – as Dale noted, I would replace the rings on both pistons. And since you’ve got it all opened up anyway, I would run a Flex-Hone won the cylinders to do a good job of deglazing the cylinders and getting a good cross-hatch pattern. Clean the block real good after honing and then oil the cylinders to prevent flash rust.

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1957 Evinrude 3022
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20

“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."

[fleetwin]

This engine has the small diameter wrist pins with plain bearings…I would check carefully for wrist pin slop…If it was mine, I would update to the later style pistons/rods/wrist pins/bearings used in the 1961 QD models.. Yes, can be pricey, but worth it if you plan on keeping the engine. Otherwise, simply check for sloppy wrist pins and use what you have… And to answer your question, the rings should be replaced on both pistons…

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