1951 NH crankcase damage

[walter.murphy]

Hey Guys

Pulled my engine down for rebuild and discovered some naked truths about 65 year old engines that have seen a lot of use.

The crankcases are matching, but have a stripped and badly repaired thread for the sump and a broken screw in another thread.

Am going to make a stepped stud from stainless and convert the rest to 1/4" BSW studs.

You can see the offending one on the bottom left. Will have to go at least a 3/8 BSF as that is what I have and step it down to 1/4 WHIT

Regards

Walter

[Bob.Murphy]

Walter,

I have used 'Lumiweld' to repair stripped thread holes.

The cases have to be scrupulously clean and when they are hot (360 deg I think) use a stainless rod to scrape the inner surface clean. The 'Lumiweld' then fuses properly. It is very strong and can be machined, drilled and tapped.

Its useful stuff and I have a couple of repairs to do on my Panther crankcases which will be at least as strong as the original alloy.

Bob.

[walter.murphy]

Guys

Decided on making a 3/8 x 1/4 Whitworth stud and get rid of the bolts for the sump altogether. Used an existing 10mm stainless bolt and reduced the shank to 3/8" and carefully machined the 1/4" reduced shank.

[walter.murphy]

More to follow

Can't seem to add anymore attachments for now.

Cheers

Walter

[walter.murphy]

Guys

Final product. Stepped Stud.

Regards

Walter