Fitting The Optional Heating And Demisting Equipment - MG MGA Twin Cam Workshop Manual

forward to disengage it from the two remaining front bumper mounting brackets which protrude
through the body.
Before replacing the body by reversing the dismantling procedure ensure that the laminated cork on
each body mounting point is in good condition and squarely mounted; also check the rubber strips
along the chassis longitudinal members, the engine bulkhead crossmember, and the cross-member
forward of the battery box.
S.9 FITTING THE OPTIONAL HEATING AND DEMISTING EQUIPMENT
Drain the cooling system. Remove the spare wheel and battery cover and disconnect the battery
leads.
Remove the cover-plate from the platform at the rear of the engine compartment by unscrewing the
eight fixing screws. Discard the plate and seals. Fit the heater assembly (1) together with two new
sealing gaskets and secure to the platform with seven of the fixing screws.
On the lever control assembly (2) attach the inner wire of the temperature control cable to the central
lever by means of a trunnion and screw. Leaving about 4 in. (4-76 mm.) of the inner wire protruding,
tighten the clamp on the outer cable and set the lever control to the "MAX'. position.
Withdraw the knobs from the two push-pull controls by depressing the spring-loaded plungers.
Unscrew the large hexagonal nuts from the controls and feed the threaded diameters through the
holes in the lever control escutcheon. Replace and tighten the hexagonal nuts and push the knobs
back into position on their spindles. The push-pull control with the shorter length of cable (4) must be
assembled to the right-hand side (marked DEMIST), and the control with the longer length of cable (3)
to the left-hand side (marked 'AIR). Remove the two Phillips screws securing the radio mounting rails
to the underside of the fascia and bolt the complete control panel to the fascia using the screws
provided.
Pierce the two large blind grommets in the bulkhead. Feed the temperature control cable through the
righthand grommet and the "AIR' cable through the left-hand grommet.
Pull the left-hand knob (*AIR') out to its stop and fit a trunnion (16) and screw (22) to the forked lever
on the air intake tube. Pass the inner cable through the trunnion and rotate the lever towards the cable
clamp, pressing it firmly into position to ensure that the flap valve completely seals the tube. Tighten
the screw and the clamp on the outer cable. Making certain that the temperature control lever on the
fascia is still in the 'MAX' position, fit the trunnion (16) and screw (22) to the water valve. Pass the
inner wire through the trunnion and rotate the valve lever anti-clockwise to the end of its slot. Tighten
the trunnion screw and the screw on the outer cable. Pull the right-hand knob (DEMIST) out to its stop
and close the heater outlet door. Fit the trunnion (15) and screw (22) to the door. Pass the inner cable
from the *DEMIST' control through the trunnion. Tighten the trunnion screw and the clamp on the outer
cable.
Remove the radiator grille and the blanking card from the air hose connector on the left-hand side of
the radiator. Fit the angled end of the shorter air hose (8) to the connector, securing the hose to the
valance tie-plate through the hole provided with a cleat, 1 in. (25.4 mm.) screw, nut, and washer. Refit
the radiator grille.
Remove the uppermost plug from the rear of the thermostat housing directly under the forward end of
the radiator header tank. Assemble the copper feed pipe and union (10) and the joint washer (28) to
the threaded hole in the thermostat housing. Remove the setscrew from the header tank rear support
lug on the exhaust manifold. Position the feed pipe clip against the lug, and replace and tighten the
setscrew.
Connect the longer rubber water hose (13) to the feed pipe using a clip (32). Pass the hose below the
brake and clutch master cylinder push-rods (L.H.D. vehicles only) and connect to the water valve
using a clip (32). Secure the rubber water hose to the bulkhead platform using the cleat (29) and the
front left-hand brake and clutch pivot platform securing screw (L.H.D. vehicles) or the front left-hand
cover-plate securing screw (R.H.D. vehicles).
252
©2018 morrisgarages.ch