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 48 of 192
•TM 9-2815-213-34
(2) Measure head height using micrometer or
vernier
calipers;
dimensions
must
not
exceed
4.4890/4.4990 inches.
(3) Restore counterbore and pocket depth at
valves and shallow counterbore area around injector port
(fig. 3-36) by grinding with a stone dressed to the
indicated contours.
b.
Regroove Cylinder Head.
If cylinder head has
been resurfaced, regroove with grooving tool (33, fig. B-
28), as shown in figure 3-37.
(1) Select scrapped injector, preferably one with
class "0" plunger bore and injector cup. Cut off cup to
expose plunger bore, to keep cup seal area intact.
(2) Install injector in cylinder head and tighten
30/35 foot-pounds torque.
(3) Select correct tool spacer block, 0.940 inch
thick. Assemble the regrooving tool, positioning largest
pilot pin so it protrudes downward
in same direction as cutter; tighten assembly in place.
(4) Rotate cylinder head and install regrooving
cutter in injector bore (fig. 347).
(5) Check position of stop in tool holder to make
certain it will not contact water hole during regrooving
operation.
(6) Adjust regrooving cutter so it protrudes
0.006/0.008 inch below stop. Rotate tool clockwise to cut
grooves. Do not rotate counterclockwise.
CAUTION
Do not attempt to cut deeper than cutter
groove depth or grooves will not form in
head.
Groove
lands
should
be
0.010/0.015 inch wide and must not
extended above head surface
Figure 3-36.
Valve and injector counterbore dimensions.
Figure 3-37.
Cylinder head regrooving.
c.
Grind
Valves.
(1) Wet grind valve from horizontal to exactly 30
degree angle.
(2) Inspect rim thickness after grinding as shown
in figure 332; if rim is less than 1/16 inch, valve is not
suitable for use and must be replaced.
(3) Check
valve
in
reamed
guide
and against
newly ground valve seat face. Pencil mark valve face and
drop into position and rotate 10 degrees. A good seat will
be indicated if all pencil marks are broken. If pencil
marks are not broken either valve seat or valve refacing
tools have not been properly adjusted; final check should
be made with vacuum tester.
3-68.
Assembly
a.
Valve Guide.
3-19
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