WANTED: Outer primary chaincase, SQ4 MK II

[seppo.seppanen]

Hello,

Shock absorber spring broke and made a crack onto outer chaincase. Luckily that happened at idling speed and saved me from total destruction. Would like to replace the outer case with a proper used one, rather than using chemical metal etc. Open for offers. 1953 SQ4 MK II.

Regards,
Seppo

[Paul_Linden]

It is nothing to do with me, but this one is for sale in the U.K.
https://rover.ebay.com/rover/0/0/0?mpre ... 2749503555
It is interesting because none of the screw holes have been drilled or tapped. Could it be a failed casting from the Ariel factory that someone rescued from a skip? I heard of such activity at Triumph in the 1970s.
Wherever it is from the casting above the bulge for the shock absorber is missing the extra bit where one of the screws goes, so that would need to be built up.
To be frank, you will only find second hand cases, and probably in worse condition than yours.

[seppo.seppanen]

Hi,

Thanks for the response. This cover is interesting piece, but lack of holes is major drawback. Got my shock spring out and it was in 4 pieces. Pure fatigue of metal I suspect. There are no other things wrong or out of tolerance. I'll keep looking and possibly make a temporary fix to my existing one while waiting.

[nevhunter]

People sometimes do a casting from an existing one as a pattern with holes bogged up and some surfaces also to allow machining. There is no allowance for shrinkage with that set up and it ends up about 1/4 inch per foot too small. Nev

[StewartPorter]

I had one similar from the same source. If you check the 2nd picture the letters GCTH identify it as a casting made by Healey's for their SQ4's. In all honesty, it wasn't the greatest quality and I got rid to one of the Healey guys at the AGM. Worth trying US ebay as they often have good SQ4 parts.

[seppo.seppanen]

Thanks for the comment. I might have a chance to have the cover 3D scanned for future purposes. Either to 3D print a new one or machined from a billet by using the CAD model.