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Briggs & Stratton: head bolt torque spec?


Joe Frickin' Friday

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Joe Frickin' Friday

My lawn mower popped its head gasket today. I will repair it, but since I don't plan to do a ton of heavy maintenance on this thing, I'd rather not invest $20 in a repair manual.

 

Anybody here got one? If so, could you tell me the torque spec for the head bolts on a Briggs & Stratton 4.0 Quattro engine?

 

Thanks...

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My lawn mower popped its head gasket today.

 

Gee, I wonder why.

 

2011-05-288-L.jpg

 

Jes' sayin'. :grin:

 

Oh, and even though you're an engineer, don't over-think it. It's just a lawn mower. Torque values don't really apply. This from my high school tech teacher, Mr. Rogers. Really, that was his name.

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Joe Frickin' Friday
My lawn mower popped its head gasket today.

 

Gee, I wonder why.

 

2011-05-288-L.jpg

 

Jes' sayin'. :grin:

 

FWIW I cut that grass in two stages, so the lawn mower didn't suffer too badly. :grin:

 

Actually I think the problem may have come from the last time I cut the grass, when the poplars were releasing tons of fuzz into the air. It clogged all of the cooling fins and the screen/fan on top of the flywheel, so the mower probably ran quite a bit hotter than spec. I used ocmpressed air to blow things clear a couple of times, but the first time I noticed it was only after it was pretty heavily obstructed.

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And what of the air filter? Not that you wouldn't have thought of that before.

 

But if you have to rebuild, I strongly suggest the 685 kit. :grin:

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Joe Frickin' Friday
And what of the air filter? Not that you wouldn't have thought of that before.

 

It seems to move a lot more air for cooling purposes than it moves through the filter. But yeah, I cleaned that too.

 

I'm not as fastidious about maintenance on the mower as I am on the bike (I don't change the oil every year, although I do use synth), but it seems to be doing OK in its tenth season.

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You use syn in the mower? Really? I didn't use syn in the the KLR fer Pete's sake. I don't mean to hammer on you, Mitch, but I have a more important question. Do you use ethanol free gas in your lawn equipment?

 

 

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Joe Frickin' Friday
You use syn in the mower? Really? I didn't use syn in the the KLR fer Pete's sake. I don't mean to hammer on you, Mitch, but I have a more important question. Do you use ethanol free gas in your lawn equipment?

 

Probably not. It's whatever they're serving up at the nearest gas station these days. :grin:

 

I also don't drain the tank at the end of each season. Nor do I use fuel stabilizer. So far, so good.

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My last mower ran for 7 years on the oil it came with in the box. I never drained the fuel over the winter. The only reason I replaced it was I had the neighbor kid mow my lawn and he found a new rock and bent the crank shaft.

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Lone_RT_rider
My last mower ran for 7 years on the oil it came with in the box. I never drained the fuel over the winter. The only reason I replaced it was I had the neighbor kid mow my lawn and he found a new rock and bent the crank shaft.

 

And the Chinese ownder why they can't make a "good" lawnmower. *rolls his eyes* :rofl:

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I am still using the first mower I ever bought about 25 years ago. I was a poor medical student at the time and paid only $15 for it 'cuz it was already 11 years old. It is a Dynamark (department store brand?) with the 3.5hp Briggs & Stratton "Easy Spin Starting" engine, and indeed it is. It is loud, powerful and has not one safety feature. I should probably put a Screamin' Eagle straight pipe on it to suppress that noise.

 

I change the oil and clean the air filter each year in the spring, and I replaced the wheels once. I expect one of my kids will get it someday.

 

Jay

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I just get a new one when it uses up all the oil in about 15 years.

:/

Actually topped mine off w/synthetic this week.

I use it about 35 times/year.

Each use is about 1 1/2 hours.

 

I don't change oil often but I do rotate the tires every election year.

:P

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