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> Cooling fan woodruff key, Crank is damaged
malcolm2
post Feb 25 2023, 06:44 AM
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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 ?
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Dave97
post Feb 25 2023, 08:35 AM
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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
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malcolm2
post Feb 25 2023, 10:15 AM
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QUOTE(Dave97 @ Feb 25 2023, 08:35 AM) *

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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Posts in this topic
malcolm2   Cooling fan woodruff key   Feb 25 2023, 06:44 AM
930cabman   Have only run maybe 4 gallons of gas thru a new r...   Feb 25 2023, 06:52 AM
malcolm2   I can't imagine that this will be JB Weld kind...   Feb 25 2023, 07:40 AM
malcolm2   moved the light and zoomed in.   Feb 25 2023, 07:41 AM
Bartlett 914   moved the light and zoomed in. It looks like t...   Feb 25 2023, 08:17 AM
porschetub   moved the light and zoomed in. Thats pretty se...   Feb 25 2023, 02:28 PM
malcolm2   RE: Cooling fan woodruff key   Feb 25 2023, 07:43 AM
barefoot   Just trial fit a new woodruff key it the slot to s...   Feb 25 2023, 07:57 AM
malcolm2   Just trial fit a new woodruff key it the slot to ...   Feb 25 2023, 08:04 AM
malcolm2   Yes, the pulley was loose. ALT belt vibrating lik...   Feb 25 2023, 08:27 AM
Dave97   I had the same thing happen, except the fan came l...   Feb 25 2023, 08:35 AM
malcolm2   I had the same thing happen, except the fan came ...   Feb 25 2023, 10:15 AM
mgphoto   New key tack welded to the crank. JB Weld could cr...   Feb 25 2023, 10:17 AM
malcolm2   New key tack welded to the crank. JB Weld could c...   Feb 25 2023, 11:09 AM
Superhawk996   First up - let’s talk about how this is designed...   Feb 25 2023, 12:05 PM
930cabman   I might dress down the material proud of the taper...   Feb 25 2023, 12:11 PM
Superhawk996   it does resist the pumping action of the fan Neg...   Feb 25 2023, 12:20 PM
malcolm2   As I did some lapping for about 45 minutes and cle...   Feb 25 2023, 03:37 PM
Superhawk996   Don’t worry about pits below the surface, make s...   Feb 25 2023, 05:08 PM
930cabman   Also get some prussian blue to ensure there is a h...   Feb 25 2023, 05:14 PM
blabla914   Superhawk has your back here. I'll add to his ...   Feb 25 2023, 05:24 PM
malcolm2   Amazon has let me down. I did purchase the Prussi...   Feb 26 2023, 08:20 AM
ClayPerrine   30+ years ago we lost the fan on Betty's 914 a...   Feb 26 2023, 09:33 AM
technicalninja   Amazon has let me down. I did purchase the Pruss...   Feb 26 2023, 10:21 AM
malcolm2   I remember lapping my Ski Nautique prop and using ...   Feb 26 2023, 11:49 AM
Superhawk996   I could see pictures just fine. That can’t be a...   Feb 26 2023, 11:59 AM
malcolm2   he called it MULTI-THOUSAND dollar prop, so yes. ...   Feb 26 2023, 12:53 PM
porschetub   he called it MULTI-THOUSAND dollar prop, so yes. ...   Feb 27 2023, 05:11 PM
bkrantz   he called it MULTI-THOUSAND dollar prop, so yes....   Feb 27 2023, 08:33 PM
ClayPerrine   [quote name='porschetub' post='3061365' date='Feb...   Feb 28 2023, 07:15 AM
Superhawk996   Take a 1 inch wide strip of all-mag about 3 inche...   Feb 28 2023, 08:29 AM
ClayPerrine   Take a 1 inch wide strip of all-mag about 3 inch...   Feb 28 2023, 09:42 AM
Superhawk996   That’s starting to look pretty good. Might lap ...   Feb 26 2023, 01:15 PM
Superhawk996   That’s starting to look pretty good. Might lap...   Feb 26 2023, 01:39 PM
Olympic 914   Looks like something that should be done on every ...   Feb 26 2023, 01:24 PM
malcolm2   Looks like something that should be done on every...   Feb 26 2023, 02:04 PM
930cabman   I would want to see at least 80 or 90% contact are...   Feb 27 2023, 06:36 PM


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