M20 ended up as part M30

Information relating to the Matchless G9 or AJS Model 20 500cc twin
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rajeshnair
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Joined: Thu Dec 10, 2015 10:34 am
Location: KARNATAKA INDIA

M20 ended up as part M30

Post by rajeshnair »

Hi all from india ,What started as a 1952 M20 with a 59 cases and modified 52 barrels I have managed to finish up as a M30 as I bought G11 barrels and heads from the USA.I live in india and as AMC twins are so rare in india.I was wondering if somebody could help me with a picture of the 59 crankcase filter with the dimension of the filter .Thanks in advance
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dave16mct
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Re: M20 ended up as part M30

Post by dave16mct »

Page 18 in the '59 manual:

http://archives.jampot.dk/book/Owners_m ... Models.pdf

Cheers Dave.
rajeshnair
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Joined: Thu Dec 10, 2015 10:34 am
Location: KARNATAKA INDIA

Re: M20 ended up as part M30

Post by rajeshnair »

Thank you Dave,my crank case has a release valve on the opposite side of the filter chamber opening into the timing chest,am I correct in guessing my cases are 1959 ? cheers Rajesh
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dave16mct
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Re: M20 ended up as part M30

Post by dave16mct »

No, the 56-59 twins didn't have any pressure relief valve. If it's a plunger with a loose spring, it will be pre 56. If it's retained by a circlip it will be after 59.
Cheers Dave.
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dave16mct
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Re: M20 ended up as part M30

Post by dave16mct »

The year should be on the front of the drive side crankcases.
rajeshnair
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Joined: Thu Dec 10, 2015 10:34 am
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Re: M20 ended up as part M30

Post by rajeshnair »

its retained by a circlip. it says 49 s 59 in the timing chest
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dave16mct
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Re: M20 ended up as part M30

Post by dave16mct »

If it's retained by a circlip you need the one piece filter assembly. Page 18 in the 1960 manual:

http://archives.jampot.dk/book/Owners_m ... models.pdf

Cheers Dave.
rajeshnair
Posts: 14
Joined: Thu Dec 10, 2015 10:34 am
Location: KARNATAKA INDIA

Re: M20 ended up as part M30

Post by rajeshnair »

Thanks a ton Dave,that really helps.cheers,Rajesh Nair
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