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OK, you have made certain the interlock is not an issue…Perhaps the gearcase is seized causing the problem…Just cuz the prop turns doesn’t mean the driveshaft is free as well…Drain the gear lube and have a look at it….
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Since the cylinder head, #62, has already been removed, you can get a better view of the pistons and maybe the rings if you remove the intake bypass covers, #’s 54 and 55 in the diagram. If the rings are exposed, you should be able to push them in slightly using a small punch or screwdriver. This is also a good place to pour in some of your favorite penetrating oil if you suspect the rings are frozen to the cylinder walls.
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As Mumbles noted, removing the bypass covers will allow you to examine the rings and piston skirts and add some penetrating oil. Avoid the natural temptation to put a big breaker bar and socket on the flywheel nut and trying to force it loose – good way to break a ring or even worse. You noted you already have some “wiggle” in the pistons, so best to add some penetrating oil and rock the flywheel back and forth to work it loose. Patience here brings positive results.
Bob
1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1957 Evinrude Fastwin 18
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."1 user thanked author for this post.
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