RD-17 and RD-18 exhaust leg cracks

[bobw]

I don’t see any such cracks in my RD-18 but I was just wondering if there would be any benefit in filling the cracks with a low temp aluminum welding rod (Alumaloy or similar).

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."

[olcah]

I can’t think of any reason to do so. If there is a crack it is not noticeable on the exterior of the leg and If the crack is from thermal stress, I think the crack would just reappear in a slightly different spot after welding. The motor I first noticed it on has more wear than I have ever seen on a Big Twin, really a parts motor. But even so the crack is not large and based on the above discussion does not seem to be any problem at all.

[Author]

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