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looonman
05-13-2009, 08:49 PM
I have a briggs m3177 18 horse motor. Last Sunday the mower lost compression when I checked it out I found that the exhaust valve seat came out of the head and is holding the valve open. My question, is this a problem with this model? Can the head be repaired or need replacing? What would be approx cost.
Thanks for input.

mowerknower
05-13-2009, 11:09 PM
Havent seen this before on that model. So I wouldnt think its a common problem. I would think you should replace the head but you could try to stake the seat in. Tap the seat back in place then take a center punch and put a mark all the way around the seat in the head. It should hold it in. Also valve seats usually only come out when there is excesive heat, make sure your cooling fins are clean.