Briggs and stratton engine bottom gasket

[pawandmaw]

What causes bottom pan engine gaskets to deter ate prematurely?? I have replaced a few and I was wondering if there was something other than normal wear causing them to let the oil leak out .
Thanks for your opinion
Paw

[38racing]

Something that causes positive crankcase pressure might cause a leak.

[ParkinLube]

Over-torqueing, using an impact to run the bolts up.

[bgsengine]

What causes bottom pan engine gaskets to deter ate prematurely?? I have replaced a few and I was wondering if there was something other than normal wear causing them to let the oil leak out .
Thanks for your opinion
Paw

1) Overheating is one of the most common - heating/cooling and the bolts work loose, gasket blows out
2) Blown head gasket (on OHV engines) overpressurizing crank case
3) Loose engine mounting bolts (vibration)
4) Under torqued bolts , and overtorqued bolts (Crushing gasket)
5) Gas in oil , and lack of maintenance (old oil retains more engine heat - see overheating above) while Gas in oil degrades and rots the gasket material

We see this frequently in 8-12 HP L-Head Briggs Verticals, and several OHV Inteks that had already had overheating issues, and lately, we seem to have a spurt of Kawasaki engines mounted on John Deere tractors with their crankcase bolts coming loose... More common on Vertical shaft engines than horizontal.

[pawandmaw]

Thank you 38racing, ParkinLube, and Bgsengine for taking the time to answer my question and educate me, and making this forum great!!
Thanks
Paw