AJS & Matchless Owners Club

Hi

I've developed an oil weep from the oil pump rear cover plate which I wish to eliminate, (in the probably fruitless search for a leak free engine ). The gasket I used during re-assembly was very a thin paper one sealed with Wellseal

I also re-assembled the cover as I had found it, knowing this was not in accordance with the parts list but see comment below re countersinks:
I realise that the parts list indicates all four attachments should be bolts, (000591), which I believe to be 3BA, can anyone confirm this size and even better give me the under head length?

I'm also confused by the fact that the cover plate attachment holes are countersunk whereas the bolts are not, resulting in a poor fit, is there a reason for this, have I got a 'wrong' plate?

I am considering fabricating another plate from aluminium alloy and without countersinks which I will install with four bolts and a slightly thicker gasket - does anyone have a cover plate lying around that they could accurately measure for me please?

Regards Mick

The bolts are 3BA x 5/16" but they are not normal hex head bolts. The head has a shoulder to fit the counterbore in the pump end plate.
The part number is 000591 and they are available from AMOC Spares.

The plate has the recess (not countersunk) to match the bolts

http://www.amoc-parts.com/store/catalog/000772.jpg

Thanks Guys

It all makes sense now - I'd convinced myself the plate was countersunk

Regards Mick