Cylinder Head (002-004)
B3.9 and B5.9 Series Engines
Section 2 - Cylinder Head - Group 02
Wear appropriate eye and face protection when using
compressed air. Flying debris and dirt can cause bodily
Wash the cylinder head in hot, soapy water solution.
After rinsing, use compressed air to dry the cylinder head.
Use skin and eye protection when handling caustic
solutions to avoid personal injury.
Do not use caustic or acidic solutions to clean the
cylinder head capscrews. Use of these solutions can
Use a petroleum-based solvent to clean the capscrews.
Clean the capscrew thoroughly with a wire brush or a soft
wire wheel, or use a nonabrasive bead blast to remove
deposits from the shank and the threads.
Inspect for Reuse (002-004-007)
Straightedge and Feeler Gauge
Use a straightedge and feeler gauge to measure the overall
flatness of the cylinder block. The overall flatness, end-to-
end and side-to-side, must not exceed 0.075 mm [0.003
Inspect the combustion deck for any localized dips or im-
perfections. If present, the cylinder block head deck must
Refer to the Alternate Repair Manual, Bulletin No. 3666109,
for grinding/milling procedures and limitations.
Cylinder Head Cracks - Reuse Guidelines
The reuse guidelines for a cylinder head with a crack ex-
tending from the injector bore to the valve seat are as
If the crack does not extend into the valve seat, the cylinder
head is reusable.