WORKHORSE CUSTOM CHASSIS
Service Manual
W SeriesWCC
SECTION
6.2
PAGE
30
Engine Mechanical
W Series Chassis
TOC
© 2006 WorkhorseCustom Chassis — All Rights Reserved
CYLINDER LEAKAGE TEST
Tools Required: J 35667-A Cylinder Head Leakdown Tester or equivalent
Important: A leakage test may be performed in order to measure cylinder/combustion chamber leakage. High
cylinder leakage may indicate 1 or more of the following conditions:
• Worn or burnt valves
• Broken valve springs
•Stuck valve lifters
• Incorrect valve lash
• Damaged piston
• Worn piston rings
• Worn or scored cylinder bore
• Damaged cylinder head gasket
• Cracked or damaged cylinder head
• Cracked or damaged engine block
Caution: Refer to Battery Disconnect Caution in Cautions and Notices.
1. Disconnect the battery ground negative cable.
2. Remove the spark plugs. Refer to Spark Plug Replacement .
3. Rotate the crankshaft to place the piston in the cylinder being tested at top dead center (TDC) of the compression
stroke.
4. Install the J 35667-A or equivalent.
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