O.S. Engines 21VZ-B - Manual (Page 4)

6
With this engine, the piston will feel tight at the
top of its stroke when the engine is cold. This is
normal. The piston and cylinder are designed to
achieve a perfect running clearance when they
reach their normal running temperatures.
As delivered, the engine has its carburetor lightly
fit into its intake. Secure it changing its angle
according to the car chassis.
NOTE
Standard accessories
Glow Plug A5 Cylinder-head gasket (0.1mm)
Exhaust Seal Ring Dust Cap 3, 16, 18
The MAX-21VZ-B(P) is a high performance
3.5cc class power unit for one-eighth-scale ra-
dio-controlled 'off-road' or 'buggy' car. It has
been designed to meet the exacting require-
ments of the world's most expert drivers.
NOTE
BASIC ENGINE PARTS
Heatsink Head
Carburetor
Type 20L
Crankshaft
Crankcase
Mounting Lugs
Exhaust
The engine is fit with one each of 0.1mm and 0.2mm
cylinder-head gasket when it leaves the factory.
Another 0.1mm head gasket is supplied with the
engine. You may add it at initial running-in, when a
glow plug tends to burn out due to high temperature
and / or high humidity or when you prefer fuel
economy to power.
Cover Plate
Super Air Cleaner 203 Assembly
7
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.
Chassis
Chamfer inside edges of bearers.
INSTALLATION OF THE CARBURETOR
As delivered, the engine has its carburetor lightly
install into its intake boss. Secure it as follows.
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. 1.
2. Rotate the
retainer nut
gently until
it stops.
Tighten a
further
120-180˚
Rotate the retainer
screw gently until it
stops, then tighten
a further 120-180˚.
Do not overtighten
the screw as this
will damage the
carburetor body.
Install the exhaust seal ring supplied.
Fit washer to glowplug and insert carefully
into heatsink head, making sure that it is not
cross-threaded before tightening firmly.
Do not allow bottom
of crankcase to
touch chassis.
INSTALLING THE GLOW PLUG AND EXHAUST
SEAL RING