REPAIR INSTRUCTIONS
Page 185
Cylinder Head Inspection
Pressure Test — It is recommended that cylinder
heads be pressurized and checked for internal
cracks and leaks. Refer to Cylinder Head and
Cylinder Block Leak Test procedures in the
TROUBLESHOOTING section.
Check the cylinder head deck surface for
warping, pitting or other imperfections. Deck
surface flatness must not vary more than
0.0015 inch (0.0381 mm) over 18 inches
(45.7 cm) of surface area. Resurface or replace
as necessary.
When resurfacing, remove a minimum amount of
material from the deck to obtain a flat, uniform
surface. Standard head height is
6.397–6.391 inches (162.483–162.310 mm). A
maximum of 0.010 inch (0.254 mm) of material
may be removed, making the minimum height of
a resurfaced head 6.381 inches (162.077 mm).
When the deck is resurfaced, fire ring groove and
valve seat insert dimensions must be re-
established following the procedure in Fire Ring
Groove Cutting.
Fire Ring Groove Cutting
GENERAL INFORMATION
Fire ring grooves are located in the machined flat
surface (deck) of the cylinder head that mates
with the engine block. This design provides a
locking groove for the fire ring to seat, as well as
a positive-combustion pressure seal.
After resurfacing the cylinder head deck, it is
necessary to re-establish the fire ring groove
depth using the fire ring groove cutter J 29600-C.
Refer to Figure 180.
180
Figure 180 — Fire Ring Groove Cutter J 29600-C
1. Alignment Fixture
2. Hold-Down Capscrews
3. Spacers
4. Washers
5. Cutter Head (J 37719)
6. Wing Nuts
7. Thickness Gauges
8. Cutter Base
5_106_00.bk Page 185 Friday, August 4, 2000 11:17 AM
BDC for engine manuals and specs
https://barringtondieselclub.co.za/
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