TM 9-2320-272-24-2
4-32. ENGINE INJECTOR TIMING INSTRUCTIONS (Contd)
i. Valve Crossheads Installation and Adjustment
1.
Loosen valve crosshead locknut (5) and back out adjusting screw (4) one full turn.
2.
Apply light film of clean engine oil to coat twelve valve crossheads (6).
3.
Install twelve valve crossheads (6) on guide of cylinder head (7) with adjusting screw (5) facing
toward exhaust manifold side of engine.
NOTE
It may be necessary to loosen valve crosshead locknut to complete
step 4.
4.
Hold crosshead (6) down with finger pressure so it contacts valve stem (9) on side opposite adjusting
screw (4) and turn adjusting screw (4) down until it just touches valve stem (8).
NOTE
Ensure adjusting screw is just lightly seated.
5.
Set up dial indicator over center of crosshead (6) and zero-dial indicator while pressing down on
valve crosshead (6).
6.
Hold crosshead (6) down lightly and turn adjusting screw (4) until dial indicator reads 0.025-0.040
in. (0.64-0.80 mm).
7.
Using torque wrench adapter, tighten valve crosshead locknuts (5) 22-26 lb-ft (30-35 Nm).
NOTE
If clearance in step 6 is not at least 0.025 in. (0.64 mm), advance
adjusting screw 1/3 of one hex on new crossheads and guides or
1/2 of one hex on old crossheads and guides, retighten locknut, and
check clearance.
j. Rocker Lever Housing and Push Tubes Installation
CAUTION
Do not mix push tubes during installation. The injector tube is
the largest, and is positioned between the intake and exhaust
push tubes. Intake and exhaust push tubes are identical.
Seating push tube lower ball ends into cam follower socket seats
is critical. Several visual checks must be made during
installation to ensure tubes remain properly seated.
1.
Install two exhaust valve push tubes (1), injector push tubes (2), and intake valve push tubes (3) by
passing ball end (10) of each down through opening in cylinder head (7) and into socket seat (12) on
cam follower (111.
4-244
