262
CID (4.3L) ENGINES
SERVICE MANUAL NUMBER 25
Cylinder Head Identification
4.3
72875
a - Left Hand Rotation (CCW) - All Sterndrive Engines
Crankshaft
The crankshaft is supported in the block by four insert type bearings. Crankshaft end thrust
is controlled by flanges on the No. 4 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 cast iron. However, engines with roller lifters have steel camshafts.
All camshafts are driven at 1/2 crankshaft speed by a timing chain and sprockets, and are
supported by four main bearings, which are pressed into the block.
A helical gear on the aft end of the camshaft drives the distributor and oil pump.
Balance Shaft
The balance shaft is located in the engine block valley directly above and parallel to the
camshaft. The balance shaft extends the entire length of the engine and is supported on
each end by a bearing. It is also driven by the camshaft through a helical gear set. The
function of the balance shaft is to equalize the dynamic forces inherent in particular engine
designs, thus minimizing engine vibration.
Index
Page 3A-12
90-861328--1 NOVEMBER 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 1262 CID, Mercury MerCruiser 262 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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