RD crank case screw torque

[stanley]

The screws are 1/4-20.The Johnson book I have says to torque to 12-14 foot lbs(144-168 inch lbs).The standard scale I have for that size shows max of 65 inch lbs for low carbon steel screws.I am replacing the screws,are the original something special?

[frankr]

I haven’t looked them up for verification, but the higher torque would be for the top, center & lower bolts near the main bearings. 65 in/lb would be reasonable for the 1/4-20’s around the edges

[Bob Wight]

Frank is correct. On my RD-18, I torqued the main bearing bolts to 156 in-lbs. and the outer 1/4-20 bolts to 70 in-lbs.

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."

[stanley]

Thank you gentlemen!

[Author]

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