TM-9-2815-213-34

ENGINE, DIESEL, WITH ACCESSORIES CUMMINS MODEL V8-300 (2815-910-8217)

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL (INCLUDING DIRECT SUPPORT AND GENERAL SUPPORT REPAIR PARTS LIST AND DEPOT MAINTENANCE ALLOWANCES)

FEBRUARY 1972

  TM-9-2815-213-34 - Page 50 of 192

Figure 3-41.
Injector sleeve rolling-upper portion.
Figure 3-42.
Injector sleeve rolling-lower portion
and proper size mandrels to fit reamed valve guides.
Dress grinding stone to 30 degrees from horizontal.
(2)
Grind valve seats, holding motor as
nearly vertical as possible.
(3)
Check valve seat width which should
be 1/16 to ΒΌ/ inch.
(
a
)
If ground seat is wider than 1/8
inch maximum stock can be removed from points "A"
and "B" (fig.
3-29) with specially dressed valve seat
grinder stones.
(
b
) Narrowing should not extend beyond
chamfer on seat insert.
Chamfer provides for peen
metal.
(4) Dress wheel for final finish and finish
grind with light touches of stone against valve seat
face.
(5) Check valve seat concentricity with valve
seat indicator.
(
a
) Use valve guide as a center.
Gage
*
*TM 9-2815-213-34
Figure 3-43.
Injector sleeve seat cutting.
Figure 3-44.
Valve seat insert counterbore.
must be a perfect fit on pilot mandrel.
(
b
) Run out should not exceed 0.002 inch total
indicator reading.
f.
Valve Assemblies
.
Reassemble valve assemblies
in reverse order of disassembly (para.
3-64).
3-69.
Tests
a.
Valve Seating
(
fig.
3-47).
Test valve seating for
leaks with cylinder head gage (2, fig.
B-29) as follows:
CAUTION
Never vacuum test cylinder head with injector
installed.
Installation of injectors could cause
misalignment of valves in valve seat area and result
in leakage during test.
(1) Select a vacuum cup of proper size for
valve to be tested.
3-21


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