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TM 10-4320-351-14
APPENDIX H
TORQUE LIMITS
H-1
INTRODUCTION.
This appendix provides general torque data to allow you to determine the torque requirements for a pumping assembly
fastener if a specific value is not listed in the text. Specific values are provided for the most critical requirements. Most
threaded fasteners are covered by specifications that define mechanical properties such as tensile strength, yield
strength, proof load and hardness. These specifications are carefully considered in initial selection of fasteners for a
given application. To assure continued satisfactory performance, replacement fasteners should be of the correct strength,
nominal diameter, thread pitch, length and finish.
Most original equipment fasteners (English or metric) are identified with markings or numbers indicating the strength of the
fastener. These markings are identified in the paragraphs that follow. Attention to these markings is important in assuring
that the proper replacement fasteners are used.
H-2
PUMPING ASSEMBLY SPECIFIC TORQUE DATA.
Fuel Transfer Pump Specific Torque Data
Item
Torque Value
Impeller Shaft Nut
100 - 110 ft lb
(135.6 - 149.2 Nm)
Engine Specific Torque Data
Item
Torque Value
Crankshaft Support Screws
190-195 in lb (21-23 Nm)
Crankshaft Center Bearing Support
190-195 in lb (21-23 Nm)
Front Crankshaft Support
190-195 in lb (21-23 Nm)
Connecting Rod Bearing Screws
26-30 ft lb (35-41 Nm)
Oil Pump Cover Screws
43-52 in lb (5-6 Nm)
Timing Cover Screws
190-195 in lb (21-23 Nm)
Cylinder Head Retaining Nuts
Step 1: 15 ft lb (20.4 Nm),
Step 2: 23 ft lb (31.2 Nm),
Step 3: 30 ft lb (43.7 Nm)
H-1
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