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How to straighten a bent cylinder head fin... #333964
09/17/10 3:53 am
09/17/10 3:53 am
Joined: Aug 2001
Posts: 1,625
Jordan, NY
Al Eckstadt Offline OP

BritBike Forum member
Al Eckstadt  Offline OP

BritBike Forum member
Joined: Aug 2001
Posts: 1,625
Jordan, NY
... without breaking it. Terrible picture but you can see the top fin on the right:



There is a really thin fragile looking web in front. How can I get this back in shape?

Thanks. Al.


Al Eckstadt
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Re: How to straighten a bent cylinder head fin... [Re: Al Eckstadt] #334085
09/18/10 12:04 am
09/18/10 12:04 am
Joined: Aug 2001
Posts: 3,348
Michigan, USA
BONZO R.I.P. Offline
In Remembrance
BONZO R.I.P.  Offline
In Remembrance
Joined: Aug 2001
Posts: 3,348
Michigan, USA
I have had ver little luck with that situation so my advice is taken FWIW but I would attempt to heat the fin with propane then wedge some wood between the lower fins and gently bend upward . This where I usually get impatient ,crack the fin and weld it back on .But hey , it gives me an excuse to sand and polish things .

FWIW-BONZO

Re: How to straighten a bent cylinder head fin... [Re: Al Eckstadt] #334096
09/18/10 1:39 am
09/18/10 1:39 am
Joined: Aug 2001
Posts: 1,625
Jordan, NY
Al Eckstadt Offline OP

BritBike Forum member
Al Eckstadt  Offline OP

BritBike Forum member
Joined: Aug 2001
Posts: 1,625
Jordan, NY
Bonzo, that's the same method described to me by a friend last week. I guess I'll have to try it. Thanks. Al.


Al Eckstadt
Re: How to straighten a bent cylinder head fin... [Re: Al Eckstadt] #340717
10/31/10 4:22 am
10/31/10 4:22 am
Joined: Aug 2001
Posts: 1,625
Jordan, NY
Al Eckstadt Offline OP

BritBike Forum member
Al Eckstadt  Offline OP

BritBike Forum member
Joined: Aug 2001
Posts: 1,625
Jordan, NY
I finally got to do this tonight. I cut hardwood wedges about 1/4 inch thick and slid one in across from the front set of fins to the rear - under the bent fin. I tapped it in lightly until the wedge got a bit tight, then with a oxy/acetylen torch (small brazing tip, small flame) lightly heated the bent area. Tapping the wedge I could feel the heat had loosened it some. Kept tapping and heating a dozen times or so until the wedge was completely under the fin. I had to change to a slightly thicker wedge and continued the process until the fin was straight. No cracks! Thanks. Al.


Al Eckstadt

Moderated by  Alan_nc 


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