What is the Head Bolt Torque on Engine Model #331877
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Spark plug torque in 180 inch-pounds; a 5mm-deep socket is required. Starter motor torque is 140 inch-pounds; a 1/2-inch T-40 socket is required. Starter thru bolt torque is 50 inch-pounds; socket size is 5/16 inch. Sump torque is 200 inch-pounds; socket size is 1/2 inch.
Tighten the cylinder head bolts in 2–3 steps in the proper sequence. The final torque specification is 59–64 ft. lbs. (80–86 Nm).
Briggs and Stratton 1X140MA Bolt, Hex – 7/16-20 x 1-1/2.
In practice, a tolerance on the torque value of +/- 10% is commonly used. This allows for the torque accuracy of the tightening tool itself and also allows a bit for intrinsic scatter associated with a person doing the tightening.
If the bolts are 10 mm (in diameter) and are grade marked 10.9 on the heads, torque them in the range of 37 to 45 ft lbs. with NO oil on the threads (dry). If the grade is marked as 8.8, torque them at low end of that range. Use a calibrated wrench.
The general equation for bolt load based on applied torque is T = KFiDb where K = torque coefficient. K is a function of the coefficients of friction and collar friction in the joint, and these are based on variables such as surface finish, coatings, and so on.
We recommend you use torque values specified below: For bolts with a 6mm Thread Diameter: 20Nm. For bolts with a 8mm Thread Diameter: 22Nm.
Set your feeler gauge at . 003 inch, and place the gauge between the straightedge and the cylinder head. If the feeler gauge fits in the gap, then your cylinder head is warped and must be machined flat. Set the straightedge at the other corners diagonally, and check the gap with the feeler gauge.
To tighten the bolt or nut use a torque wrench and tighten it to proper torque specification. Walk behind mower blades should be installed between 38 and 50 foot pounds of torque. Riding mower blades should be installed between 70 and 90 foot pounds of torque.
Note: Torque the engine mounting bolts to 250–400 in-lb.
Briggs & Stratton Metric engines require metric fasteners and drivers for the assembly and disassembly of engine components. Unless specified, the crankshaft features and crankcase cover mounting flange remain as SAE threads.
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