262
CID (4.3L) ENGINES
SERVICE MANUAL NUMBER 25
The oil which reaches the crankshaft main bearings is forced through a hole in the upper
half of each bearing and flows in-between the bearings and the crankshaft journals. Some
of the oil is then routed to the connecting rod bearings through grooves in the upper half of
the crankshaft main bearings and oil passages in the crankshaft. Oil which is forced out the
ends of the connecting rod bearings and crankshaft main bearings is splashed onto the
camshaft, cylinder walls, pistons and piston pins, keeping them lubricated. Oil which is
forced out the front end of the No. 1 crankshaft main bearing also assists in lubricating the
camshaft drive.
Oil which reaches the valve lifter oil galleries is forced into each hydraulic valve lifter through
holes in the side of the lifter. From here, the oil is forced through the metering valve in each
of the lifters (which controls the volume of oil flow) and then up through the push rods to the
rocker arms. A hole in each rocker arm push rod seat allows the oil to pass through the
rocker arm and lubricate the valve train bearing surfaces. After lubricating the valve train,
oil drains back to the oil pan through oil return holes in the cylinder head and block.
The distributor shaft and gear also is lubricated by the oil flowing through the right valve lifter
oil gallery.
Bearing Failures
b
70436
a
Scratched By Dirt
a - Scratches
b - Dirt Imbedded In Bearing Material
a
70436
Tapered Journal
a - Overlay Gone From Entire Surface
Index
Page 3A-14
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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