Filters
Ignition
Dynamo
Front fork
Carburetter
Magneto & Dynamo
Air filter
(Heavyweight models) clean metal mesh filter in oil
tank,
Clean and adjust as detailed in Electrical section.
Clean as detailed in Electrical section.
Check each side of front fork for hydraulic fluid
content and, if necessary, top up. Insufficient oil
content is indicated by abnormally lively action,
Remove carburetter float chamber side cover and
clean interior. Also detach petrol pipe banjo and
clean gauze strainer,
EVERY 10,000 MILES
Get a Lucas Service Station to dismantle, clean,
lubricate and generally service.
(If fitted) renew filter element,
ENGINE SERVICING—ALL MODELS
Tappet adjustment. The top ends of the two long push rods have screwed
extensions. These are locked in position by nuts, thereby providing tappet
adjustment. The correct tappet clearances, with valves closed and engine
warm (not hot) is nil. This means the push rods should be free enough
to revolve and, at the same time, there should be no appreciable up and
down play. See fig, 3a on p. 25.
Prepare to adjust tappets by:
Set piston to T.D.C. (both valves closed).
Remove the three nuts, and fibre washers under them, retaining tappet
cover to rocker box.
Take away cover.
Adjust tappets by:
With spanners, hold the sleeve, either valve and slacken lock nut.
Then screw, in or out, the head until the clearance is nil. Tighten lock
nut and re-check the clearance.
Finally
Check adjustment so that, with no up and down movement, the long
push rods are free to revolve when the valves are closed.
Complete adjustment by:
Replace rocker tappet cover taking care to replace fibre washer that
is under each retaining nut,
As mentioned elsewhere do not over-tighten the nuts because the joint
is made with a rubber fillet and undue pressure is not necessary.
NOTE—In normal conditions tappet adjustment should not be necessary
more frequently than about every five thousand miles or after decarboni-
sing and grinding valves. If adjustment is found necessary more frequently
the cause should be investigated at once.
For service work on the upper part of the engine, with the exception of
tappet adjustment, the twin seat and petrol tank should be removed for
accessibility.
To remove the rocker box. Remove the three nuts and fibre washers
securing the rocker box cover, also the sparking plug.
23
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