Tech Tip #10: Torque Values and Valve Settings

Dr. Diesel
Written by Dr. Diesel

Helpful guide for correctly installing your valves on Perkins and other engines

Cylinder Head Torques and Valve Clearance

Cylinder Head Torques

Valve Clearance
Perkins EngineModel Intake Exhaust
3.152-4.203 70 ft. lbs. .012 .012 (cold)
4.203.2 70 ft. lbs. .008 .012
4.108 60 ft. lbs. .012 .012 (cold)
4.154 85 ft. lbs. .012 .012 (cold)
4.236-4.248 100 ft. lbs. .012 .012 (cold)
4.318 100 ft. lbs. .012 .012 (cold)
6.354 100 ft. lbs. .012 .012 (cold)
6.354.4 (1/2) 115 ft. lbs. .008 .018
6.354.4 (5/16) 28 ft. lbs.    
V8-510-540 125 ft. lbs. .012 .012 (cold)
Continental – TMD Series
M10 50-55 ft. lbs. .014 .018
M12 90-95 ft. lbs. .014 .018
All Flat Head Engines (by Bolt Diameter)
3/8″ 35-45 ft. lbs. Y112,F135,F163 .012 .020
7/16″ 70-75 ft. lbs. F227,F245 .012 .020
1/2″ 100-110 ft. lbs. M330,M363 .017 .020
9/16″ 130-140 ft. lbs. B427 .017 .022
All Overhead Valve Engines
Ford 172 / 192 >115 ft. lbs. .014 .016 (hot)
Ford 6.300 75 ft. lbs. HYD HYD
Ford 2300 90 ft. lbs. HYD HYD
GM 6.250 95 ft. lbs. HYD HYD
GM 4.153-181 95 ft. lbs.    
GMC V6.305 70 ft. lbs. .012 .015 (hot)
GM 4.3L 65 ft. lbs. HYD HYD
Herc G-1600 65 ft. lbs. .015 .015 (hot)
(1404 CAT)      
Wauk D-155-176G 90 ft. lbs. .010 .020 (cold)
Cont G-193 105 ft. lbs. .014 .014 (cold)
A/C G-153-230 100-110 ft. lbs. .015 .015 (cold)
Chry H-225 70 ft. lbs. .014
.026 (cold)

Dr. Diesel
Written by Dr. Diesel
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