Seizef piston in 1936 Johnson 100

[Herman Powers]

I unbolted head and piston is seized in head.What s the best thing to do?

[lloyd]

Not sure if you meant to say the piston is seized in the cylinder or seized in the head. In either case heat and vibration and penetrating oil should help. Hot water to heat things up and tapping with tools for vibration.

[Herman Powers]

Thanks

[crosbyman]

round wooden peg and a hammer (alternating on the pistions if more than one) worked for me. WD40 helps . took a week to free up a 9.5HP

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[Bob Wight]

Above all, patience is your best friend. The motor didn’t get stuck like it is in just a few days, so likely it won’t free up very quickly either. Heat, cooling, lots of penetrating oil and as crosbyman noted, a wooden peg and hammer on the piston should eventually get it freed up.

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."

[Herman Powers]

It being a Model 100,the spark plug is in the side of head and not directly over piston.This makes it difficult .It is tough tapping on the bottom side of piston where rod connects.What y’all think?

[crosbyman]

looked at pics of a mdl 100…..bummer no cyl head to open up not to many options 🙁

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• This reply was modified 4 years, 3 months ago by crosbyman.

[stanley]

A grease gun and fitting for the plug hole may be your only option.If you can get the cap off of the connecting rod,and the crank out of the way,sometimes you can pull a seized piston.

[Herman Powers]

Thanks guys.I will keep on trying to get it loose

[Buccaneer]

Not to be a “Debbie Downer”, but you might want to look for a parts engine that
turns over with compression. Of the few outboards that were froze hard,
but I eventually got apart, maybe one or two turned into “runners”, and
not “great” runners. It seems that the smaller the cylinder bore, the more critical
good compression becomes.
Maybe others have had better luck.
Not to say it’s not worth trying, but it’s always good to have a back-up plan.

Prepare to be boarded!

[Author]

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