Cooling fan woodruff key, Crank is damaged |
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Cooling fan woodruff key, Crank is damaged |
malcolm2 |
Feb 25 2023, 06:44 AM
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#1
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Advanced Member Group: Members Posts: 2,747 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States |
Have only run maybe 4 gallons of gas thru a new rebuiltengine. Ran on the bench and recently installed. My cooling fan came loose.
Woodruff key is damaged along with the slot in the crank where it sits. Hub too. Is there a way to suitably repair the crank without total engine removal and teardown ? |
Dave97 |
Feb 25 2023, 08:35 AM
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#2
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Newbie Group: Members Posts: 47 Joined: 25-July 17 From: Calif Member No.: 21,285 Region Association: None |
I had the same thing happen, except the fan came loose after at least 10,000 miles.
Are the threads in the crank OK? Does the bolt feel tight in the crank? I had to drill out and tap the crank to a larger size. A couple of suggestions: Clean up the crank and lap the hub to the crank. Jb weld a new key. Your old key is probably worn When you get it together check top dead center with relation to the fan marking, this may have changed. A little bit off at the crank get bigger off at the fan. Dave |
malcolm2 |
Feb 25 2023, 10:15 AM
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#3
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Advanced Member Group: Members Posts: 2,747 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States |
I had the same thing happen, except the fan came loose after at least 10,000 miles. Are the threads in the crank OK? Does the bolt feel tight in the crank? A couple of suggestions: Clean up the crank and lap the hub to the crank. Jb weld a new key. Your old key is probably worn Dave Luckily, for me, I am just in the garage revving and setting the carbs and timing and heard the awful vibrating and tin rattle. So I think the only damage here is the key slot and the key. I have a couple old 66mm cranks leftover from other projects, so I rounded up 2 keys. Oh yeah the key is now "S" shaped. With the key out, i assembled the hub, fat washer and bolt. It threads fully into the crank easily by hand. Not loose and not wobble. Lapping will be easy. Good idea. Ok to leave the seal in to do that? What does anyone think about thread locker on this bolt? Medium, High??? or Hell NO!!! I never know for sure when locker is a bad idea. |
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