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16 HP Briggs Head Bolt Question


Horvik

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Hello;

 

I recently acquired a used 326431 0133-02 mill and noticed two of the head bolts under shroud flywheel side were loose. Of course it was loosing compression from this. I removed the head, measured the bore while at it, but all looked good.

My question is why did those bolts loosen, and what type of washers ( lock, flat?) are supposed to be there prior to torquing them down?

Thanks 

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16 hours ago, Horvik said:

what type of washers ( lock, flat?) are supposed to be there prior to torquing them down?

Head bolt washer is Briggs part #691261.  It's not a "lock" type washer; I have no idea if it's special or not.  

16 hours ago, Horvik said:

why did those bolts loosen,

Overheat; improper torque. 

 

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Use new 5/16-18, grade 5 HHCS with new grade 5 or better 5/16" flat washers. Lube threads with anti-seize, torque to spec and sequence shown in service manual.

Edited by Bill725
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