Question about Watts Onan Portable Generator - 4000 , Model# 5500

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Tappet clearance and spark plug gap on 5.5 hp ohv engine, i have a generator which runs on natural gas made by china i just want to know the gap of tappet and the spark plug gap

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I have a Robin but they all are pretty much the same for plug gap and tappets. I worked in a lawnmower small engine repair shop for many years in San Diego
I set them all the same and never had one return. I just did mine a couple of months ago and hand lapped the intake and exhaust valve seats. Starts first time everytime like the 7.5 year old unit is new!!!

Plug gap 0.19

Tappets

Intake .005 cold
Exhaust .006 cold.

Posted on Jan 25, 2010

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Posted on Jan 02, 2017

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This question is too vague to give you a good answer. But since it's coming up very high on Google searches, and I recently solved the same problem on the same generator, I thought I'd add a few notes here for others.

In my case, the engine would take a lot of cranking before it would start, and eventually refused to start altogether. If your engine won't even crank, ignore the rest of this, you have a different problem (starter, battery, cables, or solenoid).

I'm also going to assume that you've checked easy stuff like the fuel supply, spark plug wires attached, etc. The PSS8000 runs on propane or natural gas. If it's cranking for a while and not starting, you should smell gas (not gasoline, gas like the gas grill before you light it). If not, then you have a fuel problem.

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1o h.p. generator, starts fine, runs good for short periods then kind of sputters, a single sputter, but every second or so and will run like that for hours, thought running would help, didn't.


I realize you have a 10 Hp Briggs engine. The symtom your describing is often caused by the valve lash gap being to narrow on the EXHAUST valve. You may have a 0.001 gap cold but when it warms up that gap is less and you get just a bit of compression blow by but not enough to impede power output. Over time it will usually get harder and harder to start. The remedy is to reset the valve tappet gap
Depending on what engine you have the GN series the gap for intake and exhaust is 0.002 with the flywheel directly at TDC.
Standard OHV Briggs are adjusted with the flywheel 1/4 inch past TDC to a gap of .004 - .006.
The Jam nuts are torqued 65 - 85 inch lbs

Non OHV engines L-head are adjusted .004 intake and .006 Exhaust at TDC by changing valve stem length with a grinder or replacing the valve if necessary.

If you still have the problem after doing the above... replace the spark Plug... (again even if yours is new) After spark plug replacement you still have the problem respond here and I will help you until this is resolved.

This could also be a case of the fuel mixture just a tad lean..

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Hello rbryan492:

From your Description it Sounds like a Blown Head Gasket between the Push Tube Galley and the Cylinder, the Valve Clearance Requires Setting or the Flywheel Key is Damaged and Requires Replacing.
>>If you Require More Assistance, then
>>Send me the Model and Type or Spec Numbers Off the Unit, Please. With these I can Locate the Proper Manual and Better Assist you. The Model Numbers May be Stamped Into the Blower Housing (metal engine cover) Above the Spark Plug. Many horizontal shaft, overhead valve engines have these numbers stamped into the OHV rocker cover. However, on certain overhead valve powered generators, the equipment manufacturer installs a decorative chrome rocker cover OVER the Briggs cover. If your engine has a decorative cover, it may be necessary to remove it in order to locate the Model, Type, and Code. If this is a Briggs and Stratton Engine, then you can Also Use this Site Addy; http://www.briggsandstratton.com/maint_repair/BS_modeltypecode.pdf for Assistance in Locating the Model, Type and Code Numbers of the Engine.
Thanks.
Please, Do Not Hesitate, If I Missed Something or you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance.
Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Be Happy. Thanks.

Good Luck

Respectfully

jbridger (John)

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