Head Gasket.gif
Thanks for the pictures.
Yes the G12 copper gasket will fit but you will need to open up the 3.100" dia to 3.25" dia.
Can't remember where I found the gasket drawing so apologies for not attributing it.
Just found out you can get G15/45 gaskets from
http://www.amcclassicspares.com/
028411C Copper head gasket set, supplied with viton o-rings for oilways, 1962-63 G15/45 750cc (not G15 Atlas engines) (pair)
£ 21.00 £ 17.50
Is that a piston from your engine in pic 2 ?
If the pistons are 0.100" over the crankcase spigot will be wafer thin !
Std bore is 3.031" + 0.100" = 3.131" dia spigot dia is 3.240" wall thickness will be 0.110"~2 = 0.055 thou !
Perhaps your piston is from another bike /make ?
Standard pistons (+0.020")
Seeing as you have a good workshop there I would make up some longer crankcase studs (5/16ths dia) in better matl along with long nuts and thick washers.
You can then tighten the head down a little more than normal. I've been running my bike for over 10 years with no head issues.
Mike Partridge of
https://www.walridge.com/ sells a booklet about the '45' well worth buying , inside is a picture of engine 287 (1963).
MATCHLESS G15/45 LIMITED PRODUCTION EXPORT MODEL
Detailed information about this maligned machine of which only 212 were made and yet over 60 are known to survive.
By Mike Partridge & Kevin Archer
Part No. 89-4509
(Mike Will autograph and dedicate copies if asked)
Rgds Chris.
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