briggs engine base torque spec

[Cokoliso]

I have a briggs model 302431 type 0155-01 date code 7704111, 13hp L-head cast iron single cylinder engine. I'm looking for the torque spec for the engine base, which is basically the oil pan in my mind. My service manual shows specs for the "crankcase cover or sump" as 90 in-lb mag/190 in-lb PTO, but these values are for the crankcase covers on the mag and PTO ends. Searching the service manual by computer doesn't turn up a torque value for what the IPL refers to as "base assy - engine". There are only four bolts - got to tighten enough to seal against oil leaks, but not strip the casting! Any help? Thanks.

[Deere2me]

You can prolly find the spec in the Briggs Antique service man. Download a copy here:
http://bgsengineclinic.com/downloads/
Scroll down the list, you'll see it.
3/8-16 gr.5 cap screws into cast iron/steel should be 35 ft.lb. more or less.
Personally, I'd use some sealer on the gasket and just get em' tight. No big deal. You wanna make sure both gask. surfaces are free of burrs, etc.

[KE4AVB]

Since it is not listed I would use standard bolt torque specs. What is size and pitch is the bolt and is going into aluminum or cast iron? I know you said cast iron engine; just make sure of area where the bolts are going.

[Cokoliso]

I guess the engine base is aluminum - a magnet won't stick to it. The bolts are indeed 3/8-16.

[KE4AVB]

The standard dry torque for the 3/8-16 into aluminum is 143 in lbs (approx. 12 ft lbs) which is about half of what it would be into steel or cast iron.

If anyone know a better torque setting please post it.

[Cokoliso]

Great information. I feel a lot better about installing the engine base with at least this engineering data. Thanks.