Valve springs

Information relating to the Matchless G3 or AJS Model 16 350cc Heavyweight
Member
User avatar
Posts: 589
Joined: Tue Mar 15, 2016 8:51 pm
Location: Lincolnshire, UK

Re: Valve springs

Postby Pharisee » Wed Jun 19, 2019 6:39 pm

My M18 got very rattly on a trip out last year. Investigation revealed that the nut had come loose on the inlet rocker shaft and had actually fallen off. I had to dig it out with a telescopic magnet thingy. The rocker arm hadn't come off the splines, fortunately but it was loose and floating about sideways abit. The arm never disengaged from the pushrod, thankfully,

Image

Member
Posts: 65
Joined: Mon Oct 02, 2017 7:27 pm
Location: WA USA

Re: Valve springs

Postby Dixter » Fri Jun 21, 2019 9:12 am

From time to time I have read “you will need very thin spanners to adjust the push rod length”. I can readily see that most of us will need three spanners, but why a thin one?

Pharisee’s photo of his open rocker box helps make my point. Observe the image in his posting above. Trying to get a tight grip on the hexagonal cup on top of the push rod is easy. Simply rotate the crankshaft to cause the push rod to rise in the window, and use a common spanner to complete the task. Roll the engine back to TDC to check your work.

Ciao, DC
Dick Casey
The RideNut

Member
Posts: 322
Joined: Tue Jul 28, 2009 4:51 pm
Location: BERKSHIRE UK

Re: Valve springs

Postby Cerberus » Fri Jun 21, 2019 9:20 am

You will find that most "standard" thickness spanners will not get at the bottom nut without fouling the one above it. I ground down an old spanner so it fitted as I had a spare.

Member
Posts: 6049
Joined: Wed Sep 01, 2004 12:00 am
Location: WEST SUSSEX UK

Re: Valve springs

Postby SPRIDDLER » Fri Jun 21, 2019 11:37 am

mikeydpippin wrote:I don't want to be the one in the rear view mirrors sat on the side of the road...on the first rideout :rofl: .

Don't worry; if you've only gone a couple of miles Dudley would probably be there already to chat with, (or arriving soon after in the breakdown van).
I poke badgers with spoons.

Member
User avatar
Posts: 589
Joined: Tue Mar 15, 2016 8:51 pm
Location: Lincolnshire, UK

Re: Valve springs

Postby Pharisee » Mon Jun 24, 2019 2:24 pm

Cerberus wrote:You will find that most "standard" thickness spanners will not get at the bottom nut without fouling the one above it. I ground down an old spanner so it fitted as I had a spare.


Adjust the clearance and do the locknut up 'finger' tight. Rotate the engine until the valve is at full lift and there is plenty of room to get normal size spanners in to tighten the locknut. Check at TDC again afterwards.

Previous

Return to G3 / Model 16

Who is online

Users browsing this forum: No registered users and 8 guests