5hp B&S flathead head bolt torque?

Models 6B,60000, 8B, 80000, 82000, 92000, 94000, 110000,

100000, 130000, 5, 6, N, 8, 9: 140 inch pounds

Models 140000, 170000, 190000, 220000, 250000, 14: 165 inch pounds

Those are from my Briggs & Stratton Manual. Hope you have the model number handy :) I didn't see a quick cross for the cubic inch to horse power numbers. The model number relates to the cubic inches.

The 130000 is 5 hp (140 in-lbs). Bob

Thanks Leon and Bob.

-jim

Le> >

about 35 ft lbs as I recall - I used to have a book "small engine repair" by Briggs and stratton - but I lent it to someone and now I can't find it. you may look around for that book.

** Posted from **

B&S repair manual says 140 in/lbs for standard and Quantum 5hp engines. Thats 11.6 ft/lbs. I go 15 ft/lbs, but thats pushing it.

Correct. I use 14 footpounds with no problems. Thats COLD. After replacing head gaskets, run the engine to operating temperature. Then stop, allow to cool to room temp and torque again. Just takes time to do it right.

Test the head bolts tightened at the factory sometimes, the low end engines are often wildly out of spec.

140 inc pound (15.93 Nm ) looks like too much, big chance fore the 5/16 bolts been broken off, i belive more off 45-50 inch pound ( 4-5 Nm)

Standard torque recommendations

Standard torque recommendations

How can a bolt of 5/16 been tighten with 140 inch pound...ho steel quality have this bolt🤔

You're confusing FOOT pounds with INCH pounds . 140 In/lbs is less than 12 ft/lbs .