WORKHORSE CUSTOM CHASSIS
Service Manual
W SeriesWCC
SECTION
6.2
PAGE
106
Engine Mechanical
W Series Chassis
TOC
© 2006 WorkhorseCustom Chassis — All Rights Reserved
COOLANT IN ENGINE OIL
Cause Correction
DEFINITION: Foamy or discolored oil or an engine oil overfi ll condition may indicate coolant entering the engine crankcase. Low coolant levels,
an inoperative cooling fan, or a faulty thermostat may lead to an overtemperature condition, which may cause engine component damage.
Contaminated engine oil and oil fi lter should be changed.
1. Inspect the oil for excessive foaming or an overfi ll condition. Oil diluted by coolant may not properly lubricate the crankshaft bearings and may
lead to component damage. Refer to Lower Engine Noise, Regardless of Engine Speed .
2. Inspect by performing a cylinder leak-down test. During this test, excessive air bubbles within the cooling system may indicate a faulty gasket or
damaged component. Refer to Cylinder Leakage Test .
3. Inspect by performing a cylinder compression test. 2 cylinders side-by-side on the engine block with low compression may indicate a failed
cylinder head gasket. Refer to Engine Compression Test .
Faulty external engine oil cooler Replace the components, as required.
Faulty cylinder head gasket Replace the head gasket and components, as required. Refer
to Cylinder Head Cleaning and Inspection and Cylinder Head
Replacement - Left Side or Cylinder Head Replacement - Right Side .
Warped cylinder head 1. Machine the cylinder head to the proper fl atness, if applicable.
2. Replace the cylinder head gasket. Refer to Cylinder Head Cleaning
and Inspection .
Cracked cylinder head Replace the cylinder head and gasket.
Cracked cylinder liner or engine block Replace the components, as required.
Cylinder head block, or manifold porosity Replace the components, as required.
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General