TM 5-2420-230-24-2
Valve, Cylinder Head (002-020)
B3.9 and B5.9 Series Engines
Page 2-24
Section 2 - Cylinder Head - Group 02
Clean (002-020-006)
WARNING
Wear protective eye covering when cleaning the valves.
Failure to do so can cause injury to the eyes.
Clean the valve heads with a soft wire wheel.
NOTE: Keep the valves in a labeled rack to prevent mixing
prior to making measurements.
WARNING
Do not mix gasoline, alcohol, or gasohol with diesel
fuel. This mixture can cause an explosion.
WARNING
When using solvents, acids, or alkaline materials for
cleaning, follow the manufacturer's recommendations
for use. Wear goggles and protective clothing to avoid
personal injury.
WARNING
Use skin and eye protection when handling caustic
solutions to avoid personal injury.
Polish the valve stem with a Scotch-BriteTM pad, or equiva-
lent cleaning pad, and diesel fuel or solvent.
Inspect for Reuse (002-020-007)
Valve Guide Inspection
Inspect the valve guides for scuffing or scoring.
Measure the valve guide bore.
Valve Guide Bore Diameter
mm
in
8.019
MIN
0.3157
8.090
MAX
0.3185
If the inspection reveals damaged valve guides, refer to the
Alternative Repair Manual, Bulletin No. 3810234.
Valve Seat Inspection
Inspect the valve seats for cracks or burned spots.
Refer to the following reuse guidelines for any cracks dis-
covered. Service valve seats are available for seats with
burned spots that will require more than 0.254 mm [0.010
in] grinding to clean up. Refer to the Alternative Repair
Manual, Bulletin No. 3810234, for valve seat installation
procedures.
L-820
