Briggs and Stratton oil consumption

Briggs & Stratton generator troubleshooting
78buckshot
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Sun Apr 28, 2019 8:16 pm

I switched over to Valvoline GEO Premium Blue Natural Gas oil for one of my Generac liquids, it has had a good result. It is the only oil recommended by Cummins/Onan for the Ford V10 6.8 litre. I service two of the Cummins. The Valvoline is a 15W-40 and I don't know if it comes in any other weights.
Chris
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Mon Apr 29, 2019 6:57 am

I didn't know Cummins Onan was using the Ford 6.8L too? That's kinda cool that not only Generac is using that platform. Must mean something! Haha!
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Mon Apr 29, 2019 1:21 pm

I don't know what other engines they use other than their own, we do HVAC work for Google in Ann Arbor, they have a V10 60kw and another one on the roof with a converted Cummins both running on natural. On the ground they have a 250kw with a Cummins 14 litre 6 cylinder converted to natural gas, that engine has been their mainstay in the trucking industry for decades. Pretty impressive equipment.
Chris
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Mon Apr 29, 2019 4:18 pm

Very cool! I don't see anything much other than Generac and some occasional Briggs and Kohler, but those are rare for me.
Generac tech for over 12 years. I'm here to help!
"The only source of knowledge is experience" -Albert Einstein
Looking for Generac parts? Gentek Power offers the full line of Generac replacement parts! Shop Gentek Power Generac Parts
A list of my favorite Generator & Electrical Tools! https://www.amazon.com/shop/gentek_power
78buckshot
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Mon Apr 29, 2019 5:06 pm

We have maybe six total B&S and Kohler, I do the Cummins and a few others privately.
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Tue Apr 30, 2019 5:40 am

nrp3, I would make a habit of checking the valves, the VanGards have the same specs as Generac. As the valve seat sinks in the head the clearance becomes tighter just like the Generac. One nice thing about Kohler is hydraulic lifters - no adjustment needed.
nrp3
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Tue Apr 30, 2019 5:20 pm

The square tan verticals from Kohler have the mechanical valves though I haven't tried to adjust one of those. .005 on the Vanguard 1/4 past tdc I believe.
ChrisMills
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Sat Nov 30, 2019 9:01 am

The air cooled engines can run a bit hot under load for long periods. There's probably no harm in looking at the simple thing first. The different motor oils have different vaporization points. It could be that the oil is vaporizing and being pulled up through the crankcase vent.

I used a 5kw. 10hp.Coleman Powermate converted to dual fuel to provide backup power here at home. One of the problems that i ran into when converting the B&S was that a set of hardened valves was going to be needed to run propane. I contacted the company and B&S didn't make them at the time. The alternative was to use an " ashless" motor oil. You know ... something that wouldn't vaporize and create ash deposits on the valves. That oil turned out to be Red Line full synthetic 5w30 in my case. I did regular oil changes but can't recall ever having to add make up oil. The motor held up for 15 years before it finally gave out. I repowered the gen head and it's still in service.

It's an old thread but i just thought to toss it out there as food for thought. It might help someone down the line.
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