Valve Rocker Clearance - MG Midget 1979 Driver's Handbook Manual

Engine
MISSION CONTROL SY ST EM S-except California
VALVE ROCKER CLEARANCE
Checking D isconnect the purge pipe (1) from the rocker cover and unscrewthe retaining
Fig 4 screws (2). Release the collar and seal (3) from the rocker cover. Remove the
rocker cover (4) and insert a 0·010 in (0,25 mm) feeler gauge (5) between the
val~e
r? cker arms and valve stems. The gauge should be a sliding fit when the
eng ine
IS
cold. Check each clearance in the following order:
You and each su bseq uent owner of the car are urged to make sure that the
recommended maintenance procedures are carried out at the intervals specified .
For the emiss ion contro ls to continue to function effectively, it is strongly
recommended that you arrange for regular maintenance inspections to be carried
out by your authorized Austin MG Dealer or by any other qualified service
outlet which regularly performs such service on British Leyland cars.
Check No.1 valve with No.8 fully open. Check No.8 valve with No.1 fully open.
3 6 6 " 3
5 ' " 4 4 " 5
2 7 7 2
Adjusting Slacken the adjusting screw locknut (6) on the opposite end of the rocker arm and
rotate the screw (7) clockwise to decrease or anti-clockwise to increase the
clearance. Retighten the locknut when the clearance is correct, holding the screw
against rotation with a screwdriver. Re-check the clearance.
Refitting Clean the rocker cover sealing face and fit a new gasket (8) to the rocker cover.
Refit the cove r, the brackets, and connect the pu rge pipe.
Yo u have been provided with a Pa sspo rt to Service which co nta ins a facility to
recor d tha t maintenance has been carried out at the recommended mileages.
You should have the maintenance record com pleted by your authorized Austin
MG De aler (or by other dealer or station equipped to ren der such service) at
the regular mileage intervals indicated in the Schedule. The Handbook and
Passport to Service should be handed to subsequent purchasers of the vehicl
at the time of sale so that the maintenance instructions are available and that
,. the recor d of maintenance can be continued.
You ar e also urged to study with care the section covering 'MALFUNCTION
IDENTIFICATION ' . Study of this section will be of aid to you in detecting
possible malfunctions of th e em ission controls so th at necessa ry service measu res
can imm ediately be taken.
IMPORTANT
Your attention is particularl y dr awn to the following :
1.
2.
Fig. 4
The basic engine tuning data will be found on the emission co ntrol inf rrnat ion
label located in the front of the eng ine compartment.
General This section gives a genera l
description
evaporative emission control
the ir individual co mponent . It mu t b em phasized that cor rect carburetter
adj ust ment and ignition timing which hav been pre-set at the factory are essential
for the efficient functioning of th xhau t emission controls. Should it become
necessary to chec k or adjust th e ttings this wor k should be carried out by
an authorized Au stin MG or riti h Leyland Dealer who has the specialist
O rt n ;nn"H~1"'\ t ~1"'\rl t r ~;1"'\ ;1"'\ O' tn lInrl rt a Ir t h~c~ arl'llct n" ~ 1"'\tc
th eir individual co mponent . J t n
1I
t b mphasized that correct carburetter
adjustment and ignit ion timing whi h h v been pre-s et at the factory are essential
for the efficient functioning of th xh ust emission controls. Should it become
necessary to check or adjust th tt ings this wor k should be carried out by
an autho rized Au stin MG or Br iti h Leylan d Dealer who ha s the specialist
equipment and trai ning to undertake these adjustments.
2
Fig. 4