Reply To: 1955 QD 16 Rod Knock/Piston Upgrade Question

[Jeff Barsch]

Thanks for your input and fleetwin and I appreciate the offer for the crankcase, I may take you up on it if this project hits a dead end;) I was able to extract and retap the 3 broken exhaust bolts and drill out the water passage last night, see photo.  I also ran a small zip tie through all the water passages to confirm where they went and as far as I can tell the only differences were the thermostat passage and the undrilled passage.

Great idea to do a test run of the water jacket before I assemble everything to confirm I didn’t miss anything.  My next step is to fill in the thermostat water passage with epoxy.  Once that is done I can reattach the exhaust cover and head and will run water through it to see if I missed any passages.  If water goes in inlet and out exit and exhaust and cylinders stay dry I can mount the assembly to the exhaust leg and test again to see if any issues crop up there. I’ll report back when this gets done.

I looked at the 1961 base gasket and it looks like the only difference is the size was reduced for the water inlet from the water pump and there was some additional casting around the drive shaft in 1961, so I will need to stick with the 1955 style base gasket.  See exhaust leg pdf for a comparison.

Jeff

1954 Evinrude 7.5 HP
1954 Evinrude 15 HP
1954 Gale 12 HP
1955 Johnson 10 HP
1956 Johnson 10 HP
1956 Gale 12 HP
1956 Evinrude 5.5 HP
1957 Johnson Golden Javelin 35
1958 Johnson 7.5
1960 Evinrude 18 HP
1973 Johnson 6 HP