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Size of bolts on Briggs and Stratton blower-housing


david_c's Avatar
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05-31-08, 05:47 AM   #1  
Size of bolts on Briggs and Stratton blower-housing

Hi,

I have been trying to remove the blower housing on an old Briggs and Stratton lawnmower engine we have (to replace the starter cord). However, the bolt-heads are not of a metric size, and I only have wrenches with metric jaw sizes. Before I invest in a set of wrenches with imperial jaw-sizes (nowhere around here sells them separately), I wanted to check that that's what I actually need.

It's between 9 and 10 millimetres. I'm guessing it's 3/8 of an inch (9.525 mm), but would like to check if anyone here has experience with these engines before spending any money. It's hard to gauge with just a ruler (I don't have a caliper), but it certainly looks approximately 9.5 mm.

Based on the chart at http://www.sat.dundee.ac.uk/~psc/spa...Jaw_Size_Table , I'm guessing it's either "3/8 AF" or "1 BA". Can anyone clarify?

The Illustrated Parts List available for briggsandstratton.com only identifies the bolt as a "screw" - it doesn't say what size it is.

Briggs and Stratton, Quantum Series
Model no. : 12F802
Part no. : 691108

P.S. I've tried an adjustable-spanner, but - even after applying penetrating oil - it seems it might only be making matters worse.

 
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AAWrench's Avatar
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05-31-08, 10:36 AM   #2  
You are correct, they have a 3/8 inch hex head on them the bolt itself is a 1/4 inch NC thread.

 
david_c's Avatar
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05-31-08, 12:53 PM   #3  
Thanks for the clarification AAWrench. I felt I might be making much ado about little, but wanted to be sure.
Cheers.

 
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