WORKHORSE CUSTOM CHASSIS
Service Manual
W SeriesWCC
SECTION
6.2
PAGE
67
Engine Mechanical
W Series Chassis
TOC
© 2006 WorkhorseCustom Chassis — All Rights Reserved
LUBRICATION DESCRIPTION
The gear-type oil pump is driven through an extension driveshaft. The extension driveshaft is driven by the oil pump
drive, which is gear driven by the camshaft. The oil is drawn from the oil pan through a pickup screen and tube, into
the oil pump. Pressurized oil fl ows through the oil fi lter, into the oil cooler, back into the engine, up to the oil pressure
gage port and rear crankshaft bearing, and is then distributed to the upper oil galleries. Oil must fl ow around the oil
pump drive in order to reach the right side valve lifters properly. The oil is delivered through internal passages in
order to lubricate camshaft and crankshaft bearings and to provide lash control in the hydraulic valve lifters. Oil is
metered from the valve lifters through the valve push rods in order to lubricate the valve rocker arms and ball pivots.
Oil returning to the oil pan from the cylinder heads and the front camshaft bearing, lubricates the camshaft timing
chain and the crankshaft and the camshaft sprockets. There are two bypass valves located in the engine block,
above the oil fi lter. The oil fi lter bypass valve and the oil cooler bypass valve.
If the oil fi lter becomes plugged, the pressurized oil is diverted around the top of the oil fi lter. The oil fi lter bypass
valve is forced open, allowing the oil to continue on to the oil cooler and engine oil passages. No oil fi ltration occurs
because the oil is not allowed into the oil fi lter.
If the oil cooler fl ow becomes blocked, either from a plugged oil cooler or blocked or kinked oil cooler line, the oil
cooler bypass valve is forced open, allowing oil to fl ow directly into the engine oil passages. Oil does not fl ow into or
out of the engine oil cooler.
If both the oil fi lter and the oil cooler are plugged, the pressurized oil is routed around the top of the oil fi lter, through
the oil fi lter bypass valve, through the oil cooler bypass valve and directly into the engine oil passages. Lubrication
still occurs, but the oil is not fi ltered or directed through the oil cooler.
To Next Page
Loading...
General