5.0l
/ 305 cid / 5.7l / 350 cid ENGINES
SERVICE MANUAL NUMBER 24
Engine Rotation
Engine rotation terminology at times has caused confusion. To clarify, engine rotation is
determined by observing flywheel rotation from the rear (transmission or stern drive end)
of the engine looking forward (water pump end).
PROPELLER ROTATION IS NOT NECESSARILY THE SAME as engine rotation.
When ordering replacement engines, short blocks or parts for engines, be certain to check
engine rotation. Do not rely on propeller rotation in determining engine rotation.
a
72001
a - Left-Hand Rotation (CCW) - All Stern Drive Engines, MIE Inboard LH (Stan-
dard) Rotation
Description
Crankshaft
The crankshaft is supported in the block by five insert type bearings. Crankshaft end thrust
is controlled by flanges on the No. 5 bearing. A torsional damper on the forward end of the
crankshaft serves to help dampen any engine torsional vibration.
Piston and Connecting Rods
Piston pins are offset slightly toward the thrust side of the pistons to provide a gradual
change in thrust pressure against the cylinder wall as the piston travels its path. Pins have
a floating fit in the piston and a press fit in the connecting rod (to hold them in place).
Connecting rods are made of forged steel and are connected to the crankshaft through
insert type bearings.
Camshaft and Drive
Camshafts are generally made of cast iron. However engines with roller lifters have cam-
shafts made of steel. All camshafts are driven at one-half crankshaft speed by a timing chain
and sprockets, or by timing gears. The camshafts are supported by five main bearings that
are pressed into the block.
A helical gear on the aft end of the camshaft drives the distributor and oil pump. An eccentric
cam on the front of the camshaft drives the fuel pump through a push rod. The fuel pump
push rod is made of different material when used on engines with steel camshafts and roller
lifters, than for engines with cast iron camshafts.
Index
Page 3A-12
90-861327--1 OCTOBER 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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