Pre-unit Case Repair - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 5 (permalink) Old 02-08-2011, 12:40 AM Thread Starter
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Pre-unit Case Repair

I'm considering restoring a '56 T110 that my Dad has had sitting in a shed for more than 30 years. The biggest concern I have is that the case is cracked right at one of the cam bearings. I've seen a lot of cases on e-bay that have this same problem so I assume it is a common one.

Is it possible to effectively repair a crack in this area by welding the case? If so, can anyone recommend a shop in the So Cal area with experience doing such a repair? My Dad used to have a shop specializing in British bikes so I think he can help with the rebuild but welding aluminum is something I'd rather leave to an expert.
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post #2 of 5 (permalink) Old 02-23-2011, 05:02 PM
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Can you put some pics of this crack? I have several pre unit engine cases and dont see any cracs. But I run succesfuly engine with welded hole made by broken rod,on front timing side cases!
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post #3 of 5 (permalink) Old 02-23-2011, 08:01 PM
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Welding a case

Quote:
Originally Posted by smurdy View Post
I'm considering restoring a '56 T110 that my Dad has had sitting in a shed for more than 30 years. The biggest concern I have is that the case is cracked right at one of the cam bearings. I've seen a lot of cases on e-bay that have this same problem so I assume it is a common one.

Is it possible to effectively repair a crack in this area by welding the case? If so, can anyone recommend a shop in the So Cal area with experience doing such a repair? My Dad used to have a shop specializing in British bikes so I think he can help with the rebuild but welding aluminum is something I'd rather leave to an expert.
Due to possible distortion from the heat of the welding process, it is wise to leave adjacent cases, cams, etc intact and torqued. The cam needs to turn freely throughout the process. I had mine done by a local shop in business since the 60's. They showed me a repair that had 10-times as large a hole as mine. Bob
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post #4 of 5 (permalink) Old 02-24-2011, 09:10 PM Thread Starter
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Quote:
Originally Posted by mcrmirko View Post
Can you put some pics of this crack? I have several pre unit engine cases and dont see any cracs. But I run succesfuly engine with welded hole made by broken rod,on front timing side cases!
The bike is still in the shed so I can't get a pic now but I'll post one when I can get over there. I may be mistaken about the cracks I saw on ebay--could just be bad pictures.

As far as this crack, the Old Man says it was caused when someone (not him) tried to replace a stud and somehow cracked the case right at the cam bearing.
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post #5 of 5 (permalink) Old 02-24-2011, 09:12 PM Thread Starter
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Originally Posted by coloradobob View Post
Due to possible distortion from the heat of the welding process, it is wise to leave adjacent cases, cams, etc intact and torqued. The cam needs to turn freely throughout the process. I had mine done by a local shop in business since the 60's. They showed me a repair that had 10-times as large a hole as mine. Bob
Thanks for the advice Bob, that makes a great deal of sense. I'll see if I can locate a local person with that level of experience to fix it.
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