O.S. Engines 18TZ(S)-T - Manual (Page 16)

INSTALLATION OF THE CARBURETOR
As delivered, the engine has its carburetor
lightly fit into the intake boss. Secure it as
follows.
1. Loosen the retainer screw, rotate the
carburetor to its correct position and make
sure that it is pressed well down into the
intake boss, compressing the rubber gasket,
before retightening screw.
2. Rotate the retainer screw gently until it
stops, then tighten a further 60-90°.
Do not overtighten the screw as this will
damage the carburetor body.
Rotate the retainer nut
gently until it stops.
ENGINE INSTALLATION
Make sure that the vehicle's engine mounting
surfaces are level and in the same plane. Poor
installation may cause distortion of the
crankcase, bearings, etc., resulting in erratic
running and loss of performance.
The recommended screws for securing the
engine are 3mm or 4-40 steel Allen hexagon
socket type.
If existing holes in the engine mount do not align
perfectly with engine mounting lugs, enlarge
them slightly with a needle-file so that screws are
in alignment with the mounting holes.
Do not allow bottom
of crankcase to
touch chassis.
Chassis
Chamfer inside edges of bearers.
Tighten a further 60-90"
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