WORKHORSE CUSTOM CHASSIS
Service Manual
W SeriesWCC
SECTION
6.2
PAGE
17
Engine Mechanical
W Series Chassis
TOC
© 2006 WorkhorseCustom Chassis — All Rights Reserved
Worn or bent push rods Replace the push rods.
Sticking valves
Carbon buildup on the valve stem and/or seat can cause the valve to not
close properly.
Repair or replace, as required.
Excessively worn or mis-aligned timing chain Repair or replace the timing chain, camshaft retainer, and sprockets,
as required
Worn camshaft lobes Replace the camshaft and valve lifters.
Excessive oil pressure
A lubrication system with excessive oil pressure may lead to excessive
valve lifter pump-up and loss of compression.
1. Perform an oil pressure test. Refer to Oil Pressure Diagnosis and
Testing.
2. Repair or replace the oil pump, as required.
Faulty cylinder head gaskets and/or cracking or other damage to the
cylinder heads and engine block cooling system passages
Coolant consumption may or may not cause the engine to overheat.
1. Inspect for spark plugs saturated by coolant. Refer to Spark Plug
Inspection.
2. Perform a pressure test to the cooling system. Refer to Loss of
Coolant .
3. Inspect the cylinder heads, engine block, and/or head gaskets.
Refer to Coolant in Combustion Chamber .
4. Repair or replace, as required.
Worn piston rings
Oil consumption may or may not cause the engine to misfi re
1. Inspect the spark plugs for oil deposits. Refer to Spark Plug
Inspection .
2. Inspect the cylinders for a loss of compression. Refer to Engine
Compression Test .
3. Perform cylinder leak down and compression testing to identify the
cause. Refer to Cylinder Leakage Test .
4. Repair or replace, as required.
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General