Cylinder Head and Valves
02
020
55
RG,RG34710,93 –19–16OCT00–1/1
Clean and Inspect Top Deck of Cylinder
Block
RG8210A –UN–05DEC97
Cleaning Head Bolt Threads
RG8208 –UN–21MAY98
Measuring Block Top Deck Flatness
A—JDG978 Special Tap
1. Remove gasket material, rust, carbon, and other
foreign material from top deck using a powered brass
or copper (soft) wire brush. DO NOT use a steel wire
brush.
2. Clean threaded holes in cylinder block using JDG978
Special Tap (A) or an equivalent M16 x 2.0 x 140 mm
(5.50 in.) long tap.
3. Use compressed air to remove debris and fluids from
cap screw holes. Replace block if thread damage is
detected.
4. Inspect and measure top deck for flatness. Service as
required. (See MEASURE CYLINDER BLOCK, in
Group 030.)
5. Clean all oily residue and dirt from top deck before
installing head gasket.
CTM100 (06APR04)
02-020-55
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=127
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