WORKHORSE CUSTOM CHASSIS
Service Manual
W SeriesWCC
SECTION
6.2
PAGE
97
Engine Mechanical
W Series Chassis
TOC
© 2006 WorkhorseCustom Chassis — All Rights Reserved
BASE ENGINE MISFIRE WITH COOLANT CONSUMPTION
Cause Correction
Faulty cylinder head gaskets and/or cracking or other damage to the
cylinder heads and engine block cooling system passages
Refer to Diagnostic Starting Point - Engine Cooling.
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 cylinder leak down test. Refer to Cylinder Leakage Test .
3. Inspect the cylinder heads and engine block for damage to the
coolant passages and/or a faulty head gasket. Refer to Coolant in
Combustion Chamber .
4. Repair or replace, as required.
BASE ENGINE MISFIRE WITH EXCESSIVE OIL CONSUMPTION
Cause Correction
Worn valves, valve guides, and/or valve stem oil seals 1. Inspect the spark plugs for oil deposits. Refer to Spark Plug
Inspection .
2. 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 determine
the cause. Refer to Cylinder Leakage Test .
4. Repair or replace, as required.
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