FD-10 crankshft, 1956 15 hp.

[GUY SCHMIDT]

I have two Johnson ’56 15 hp. motors and both have 203711 cranks in them which is an evinrude number. Was this crank a substitute for the 203657 that was called for in the parts manual or what?

[oldlure]

I show both 203711 and 203657 being replaced by 204100.
204100 applying to FD-10, FDE-10, FD-10L, FD-10S and Fastwin 15014, 15015 from serial # 50001 & up, 15016 thru 15919

[GUY SCHMIDT]

Thankyou, I never saw that number come up….very interesting.

[frankr]

There were at least 3 types of lower seals used on the 15’s. Une type had a stainless steel sleeve on the bottom end of the crank, which promptly split and fell off. That type crank was replaced with one without the sleeve, for obvious reasons after replacing a load of powerheads.

[GUY SCHMIDT]

I’ll stay clear of that one. Maybe that’s why both my Johnsons had an Evinrude crank. They may have been victims to that seal. Do you know the number of the crank in question ?

• This reply was modified 3 years, 6 months ago by GUY SCHMIDT.

[Mumbles]

My ’56 Evinrude and Johnson 15 horse parts manuals both show P/N 277594 for the cranks although the Evinrude manual describes it as ‘crankshaft with sleeve’ while the Johnson manual describes it as just ‘crankshaft’.. My superceded parts number manual shows the original P/N 277594 superceding to 203657 and 307659. I can’t find any reference to P/N’s 203711 or 204100 anywhere.

• This reply was modified 3 years, 6 months ago by Mumbles.

[Bob Wight]

I found the part number 204100 listed in the Johnson Common Parts Guide.

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
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."

[Phil Budne]

I’ve never heard of there being Evinrude or Johnson only internal, non-cosmetic-related parts for same-hp same-year engines from the 50’s or 60’s before… I thought when it came to mechanical parts they all came from the same places: Johnson specialized in castings, Evinrude in forged parts, and I remember hearing that Gale made magneto parts…

http://www.omc-boats.org
http://www.aerocraft-boats.org

[oldlure]

My supersedes information comes from a 1972 Johnson master parts price book. It also shows 277594 being replaced by 204100. 307659 is not in the 1972 price book.

[olcah]

203711 is the casting number on crankshafts from 1956 Evinrude/Johnson 15 HP motors.  That number is shown in the attached photo of a crankshaft I removed from either a 1956 Evinrude or Johnson 15 HP.   So that casting would have been machined to be crankshaft 277594.

Brought back this old thread as that info may be helpful to someone working on one of these motors.

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