DESCRIPTION
The engine is a four-cylinder carburettor unit with overhead valves.
The pistons are made of light-alloy and the upper compression ring on
each piston is chromed. The main bearings and connecting rod bearings
are replaceable. The crankshaft is statically and dynamically balanced.
Engine type B 18 A
has an output of 85 h.p. (SAE) and is equipped with
Zenith-Stromberg horizontal carburettor.
Engine type B 18 D
has an output of 100 h.p.
(
SAE
)
and is equipped
with twin SU horizontal carburettors.
Fuel system
The fuel system is fed from the tank to the carburettor by a fuel pump
which is driven by a cam on the engine camshaft. There is a filter in the
fuel pump which traps water and other impurities in the fuel.
Lubricating system
The engine lubrication is taken care of by a gear pump which sucks up
oil from the sump on the bottom of the engine and forces it through the
oil filter out to the lubricating points in the engine. A relief valve is
built into the oil filter which prevents the oil pressure from reaching
excessively high values.
Cooling system
The engine is water-cooled and the cooling system is of the pressure type.
Water is circulated by means of a pump fitted on the fan shaft. A thermo-
stat
with an opening temperature of about 76
°
C (169
°
F) prevents the
cooling
water from passing through the radiator before the engine has
reached its normal working temperature.
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