G2 rocker oil feed updated , advice please

Information relating to the Matchless G2 or AJS Model 14 250cc Lightweight
Member
User avatar
Posts: 902
Joined: Sat Jun 20, 2015 8:38 am
Location: Chester, UK

Re: G2 rocker oil feed updated , advice please

Postby clanger9 » Wed Mar 27, 2019 10:37 pm

Probably a good thing that you did check the oil pump. When the teeth are worn, they can strip (with very messy results).
I was surprised at just how thin the teeth were on mine when I rebuilt it:
viewtopic.php?f=12&t=22824#p186831
1966 AJS Model 14 250 CSR "cafe racer"
1993 Ducati 750SS

Member
User avatar
Posts: 2584
Joined: Wed Dec 14, 2011 1:02 am
Location: ESSEX UK

Re: G2 rocker oil feed updated , advice please

Postby Ozmadman » Thu Mar 28, 2019 9:25 am

Richard Hyatt wrote:We were tempted , but we weren't sure if the loss of oil pressure to the rocker jets was caused by the oil bleeding past the O ring in the blanking button.
It seemed daft not to have it out and replace the O ring whilst we were in that far.
It was then we discovered the end of the screw broken off (I assume in the groove) making it difficult to extract the blank.
We just want to cover everything that could have prevented the oil getting to the rockers
And
Having covered all the other bits and still not got oil up there , were forced to go deeper , discovering the screw on the pump plunger very thin teeth

Makes sense :beer:
Paul
1960 Model 8
1974 Yamaha RD250B US Model 6 speed

Member
Posts: 91
Joined: Sun Jan 27, 2019 8:52 pm
Location: Dorset

Re: G2 rocker oil feed updated , advice please

Postby Richard Hyatt » Thu Apr 04, 2019 5:30 pm

Just an update for all of you who have given advice and ideas.

Found the blockage ! Eureka.

Engine out of the frame and oil pump out already. Blew air into oil hole on crankcase mouth and out popped a huge , really huge blob of silicone from the P.O.
See what happens when we spin the crank when all reassembled.

Member
User avatar
Posts: 902
Joined: Sat Jun 20, 2015 8:38 am
Location: Chester, UK

Re: G2 rocker oil feed updated , advice please

Postby clanger9 » Thu Apr 04, 2019 5:44 pm

Wow! Well done for persevering. :beer:
A great example of why silicone sealant should never be allowed anywhere near an engine...
1966 AJS Model 14 250 CSR "cafe racer"
1993 Ducati 750SS

Member
Posts: 91
Joined: Sun Jan 27, 2019 8:52 pm
Location: Dorset

Re: G2 rocker oil feed updated , advice please

Postby Richard Hyatt » Thu Apr 04, 2019 6:20 pm

so - we have a new pump , button / peg bolt and O ring and new guide pin . SAE 50

any hints and tips on installing the new pump - obviously prime it and grease the teeth and engage/twist or rotate the crank to mesh the gears properly and then tease the guide pin in whilst looking in the guide pin hole to ensure the slot is in the right place.

our new pump has an extra hole in the feed part of it(the flat slot is identical) - the scavenge side is identical. I got it from RUSSELLS who has been mega helpful , so hopefully it will be fine.

Member
User avatar
Posts: 902
Joined: Sat Jun 20, 2015 8:38 am
Location: Chester, UK

Re: G2 rocker oil feed updated , advice please

Postby clanger9 » Thu Apr 04, 2019 6:45 pm

Yes, the one I got from Russells also has an extra hole (don't know why):
viewtopic.php?f=12&t=22824&hilit=oil+pump

It should go together easy enough. As you say, make extra-sure the groove in the oil pump is exactly lined up before screwing the pin home. Of course, put the pin in the right way round (fat end to the plunger).
1966 AJS Model 14 250 CSR "cafe racer"
1993 Ducati 750SS

Member
Posts: 91
Joined: Sun Jan 27, 2019 8:52 pm
Location: Dorset

Re: G2 rocker oil feed updated , advice please

Postby Richard Hyatt » Sun Apr 21, 2019 5:58 pm

Hi again to all the helpful contributors during my rocker oil problem.
Just a thank you , it's all sorted and running and nice and oily up there , despite a worrying delay in appearing , lo and behold out it squirted . Phew.

Member
User avatar
Posts: 1141
Joined: Sat Oct 09, 2010 8:17 pm
Location: SWANSEA UK

Re: G2 rocker oil feed updated , advice please

Postby cbranni » Sun Apr 21, 2019 7:09 pm

That is good news Richard.
only dead fish go with the flow

Member
User avatar
Posts: 2460
Joined: Mon Jan 01, 1990 12:00 am
Location: HAMPSHIRE UK

Re: G2 rocker oil feed updated , advice please

Postby ajscomboman » Sun Apr 21, 2019 7:34 pm

clanger9 wrote:Wow! Well done for persevering. :beer:
A great example of why silicone sealant should never be allowed anywhere near an engine...


Can't agree with that, maybe monkeys with out much idea of how much to use shouldn't be allowed anywhere near an engine whilst using silicone is probably more accurate. The modern Triumphs and Honda's advise using silicone sealant on their rocker cover gaskets etc. However they don't advise how much! :headbang:

Previous

Return to G2 / Model 14

Who is online

Users browsing this forum: No registered users and 9 guests