TM 5-3805-280-24-2
Cylinder Head and Valves
INSPECT AND CLEAN CYLINDER HEAD
05
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1. Inspect combustion face for evidence of physical
damage, oil or coolant leakage, or gasket failure prior
to cleaning the cylinder head. Repair or replace
cylinder head if there is evidence of physical damage;
such as cracking, abrasion, distortion, or valve seat
"torching". Inspect all cylinder head passages for
restrictions.
2. Scrape gasket material, oil, carbon, and rust from
head. Use a powered wire brush to clean sealing
surfaces.
IMPORTANT: Be sure to remove all plugs before
cleaning head, as parts can be
damaged or destroyed by hot tank
solutions.
3. Clean cylinder head in a chemical hot tank, or with
solvent and a brush.
4. Dry with compressed air and blow out all passages.
RG,05,DT7360 1911NOV971/1
CHECK CYLINDER HEAD FLATNESS
Check cylinder head flatness using D05012ST Precision
Straightedge and feeler gauge. Check lengthwise,
crosswise, and diagonally in several places.
Cylinder Head Flatness--Specification
Maximum Acceptable Out-of-Flat:.............................. 0.08 mm (0.003 in.)
For Entire Length or Width
Maximum Acceptable Out-of-Flat:.............................. 0.03 mm (0.001 in.)
For Every 150 mm (5.90 in.)
If out-of-flat exceeds specifications, the cylinder head
must be reconditioned or replaced. (See MEASURE
CYLINDER HEAD THICKNESS later in this group.)
RG,05,DT7359 1911NOV971/1
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