1938 LaSalle Production - GM Heritage Center

cylinders of a bank draw from the same manifold leg.
AH intake ports are siamesed. The exhaust ports are
single, the two center ports of each cylinder block connecting
directly to that portion of the exhaust manifold
which heats the intake manifold division chamber.
The two exhaust manifolds discharge into a cross pipe
placed just behind the carburetors. This pipe conducts
the exhaust to the left side of the engine from which
the exhaust system leads it downward and to the rear.
Exhaust System
The exhaust pipe leads backward along the left side of
the chassis to a large muffler mounted transversely
behind the gasoline tank. To keep heat away from the
body interiors, the pipe is outside the frame side bar
for most of its length.
COOLING SYSTEM
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The new Sixteen engine has two independent water
circulating systems, there being one for each bank of
eight cylinders.
The illustration on page 218 shows the general arrangement
of the water pump and fan belt drive. Two
parallel V-belts driven by double pulleys at the front
end of the crankshaft encircle the two water pump
pulleys at the sides of the engine and the fan drive
pulleys at the top. The double belts obviously have
materially longer life than a single belt.
Each of two outlets at the base of the radiator is
connected to one of two centrifugal water pumps *
mounted in the front ends of both cylinder blocks. The
pumps employ permanent carbon block water pump
packing. The pump impellers are held on very hard '
steel shafts by a press fit. With dual belt drive the
former shear pin construction is unnecessary.
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