F
OR
M
ODELS
: JGI, JGM, JGN, JGP
AND
JGQ
S
ECTION
5 - M
AINTENANCE
PAGE 5-43
of Never-Seez, regular grade), and install bolting. Do not otherwise use anti-seize com-
pounds on valve cap bolting. Tighten each cap screw until snug using a criss-cross pattern.
Next, tighten each bolt to 25% of full torque, moving across from bolt to bolt, in a criss-cross
pattern. See Figure 5-31 on Page 5-42, 1-2-3-4-5. Repeat this step for 50%, 75% and 100%
of full torque. If the assembly is correct, the distance from the underside of the cap to the
valve pocket boss surface on the cylinder will be uniform 1/8 inches (3 mm).
Proper tightening and torquing is important for all valve caps, but is especially important for
high pressure valve cap assemblies. High pressure applications have caution plates on the
cylinder which are stamped with proper torque values:
VVCP - Head-End Variable Volume Clearance Pocket
CAUTION
SEVERE PERSONAL INJURY AND PROPERTY DAMAGE CAN
RESULT IF VALVE CAP BOLTING IS NOT INSTALLED TO
PROPER TORQUE OF ______FT. LBS. ______N·M.
REFER TO TECHNICAL MANUAL FOR PROPER TORQUING
PROCEDURE.
CAUTION
TRAPPED GAS PRESSURE CAN PRESENT A PERSONAL
SAFETY HAZARD WHEN SERVICING THE VVCP. WORK IN A
WELL VENTILATED, NON SPARKING AREA. DO NOT
BREATHE GAS EMITTED FROM VVCP WHEN VENTING
TRAPPED GAS.
!
!
