Cylinder Head and Valves
02
020
29
RG,RG34710,80 –19–03SEP02–1/2
Clean and Inspect Cylinder Head
RG8266 –UN–06DEC97
Fuel Rail
A—Supply Rails (Dual Rail System Shown)
IMPORTANT: DO NOT USE scouring pads or wire
brush to clean gasket sealing surface
(combustion face). Doing so may affect
sealing ability of gasket joint.
DO NOT “hot tank” clean cylinder head
unless all plugs and valve guides are
removed for replacement. Hot tank
solution will destroy lubricating
properties of valve guides.
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. Inspect around injector sleeve for evidence of fuel or
coolant leakage.
3. Scrape gasket material, oil, carbon, and rust from
head. Use a powered brass or copper (soft) wire brush
to clean sealing surfaces. DO NOT use a steel wire
brush.
4. Clean valve guides using a plastic brush.
IMPORTANT: During engine repair or overhaul,
cleanliness of fuel supply rail(s) (A) is
extremely important due to fuel flow
through passages. Think of the fuel
rails as internal passages of an
injection pump; therefore, same
cleanliness must be maintained.
5. Remove fuel rail expansion plugs in front of cylinder
head and thoroughly clean fuel rail passages using a
rifle-type cleaner (solvent). All debris must be removed
from fuel rail.
6. Dry with compressed air and blow out all passages.
CTM100 (06APR04)
02-020-29
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=101
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