oliver8498
I have a 10kw model 04079-3 serial 3243217. 65 hours on unit, I purchased used 4 years ago. I have been experiencing low oil shut off since i installed it. It will run for 10 minutes or so then quit and low oil light will come on. I have hooked up a gauge and it will run 15-20 psi then drop below 10 psi when warmed up. I have read about the 8kw having problems with the wave washer. My owners manual says my engine is gn 724 which say is the same for the 8kw. Could this be the same issue?
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Peddler
You need to make sure that it is not over full of oil. If there is too much oil then the crank pin will beet the oil to a froth and it will cavitate. I will say that the initial oil pressure is pretty low as most would be 40-50 cold. Good Luck, Peddler
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oliver8498
it has 2 quarts in it. I have changed it at least 5 times due to everyone telling to try different oil and filters. It runs fine and it will maintain 5 to 7 psi. I am thinking of tearing it down and changing the oil pump if parts are still available.
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Peddler
If it has two quarts in it, [B]it has way too much oil![/B] That engine takes about 1.5 quarts or less and even a pint too much is probably the problem. I recommend draining it completely and putting 1.25 quarts of 5W30 in and check the pressure with the mechanical gauge and see what you have. I would bet that is your problem. Peddler
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oliver8498
Ok I will try that. I used 2 qts due to my owners manual stating 2 qts. Thank I will update you with the results
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skutflut
oliver8498;35591 wrote:
Ok I will try that. I used 2 qts due to my owners manual stating 2 qts. Thank I will update you with the results


When refilling the oil I put in one Quart then start adding the second quart slowly, checking the dipstick every few ounces. You kind of sneak up on the full mark. Give it a bit of time before adding the last few ounces to allow the oil to find it's way to the crank case. You should be able to get it spot on full this way. Your oil bottles probably have markings on the sides to show how much oil is left in the bottle, so it's easy to find out exactly how much it REALLY takes to fill it up, and write down that number on your maintenance sheet for future reference, unless you can remember it.

I find that between snowblowers, lawnmowers, generators, pressure washers etc, (mine and others) all with different engines and oil grades, I tend to write things down, and also put dymo stickers on things a lot.
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patmurphey
He's right about 2 quarts: see page 6 of the owner's manual (part nr. C2369).
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Namvet34
An easy way to determine engine oil fill level

.

Last year I had my model 6241 14kw generator serviced by my installing dealer. It has the 992 cc V-Twin engine. When the technician changed the oil, he didn’t even bother reading the dipstick until after he had filled the engine. He knew exactly how much oil to use to fill the engine, as I’m sure all of the techs and dealers on this site do.

First, he poured in one full quart. He then added enough oil so that when he was done pouring he had exactly the right amount of oil in the engine. He then checked the oil on the dipstick and it was spot on. I took a couple of pictures you can use as a guideline. The oil that remains in the container is the exact amount that the technician left in the one quart container that was only partially used.

I haven’t checked, so I don’t know what size engine you have in your generator, so please, don’t use the level of oil shown in the pictures I’m providing as a guideline for filling [B]your[/B] engine. What I am saying though, is that once you determine exactly how much oil your engine requires, save the container with the remaining unused oil or save a container that you’ve marked indicating the amount of oil that remains after you’ve properly filled [B]your engine[/B] and use it as an indicator or how much oil you’ll need in the future when you change oil.

It’s an accurate means of filling your engine to the correct level and it takes the guesswork out of trying to read the oil level on that shiny dipstick that Generac uses.

Regards,

Gene

.
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oliver8498
Ok, so I don't drained off over half a at of oil. I started it up with 20 psi of pressure. It ran for 7 minutes the. Dropped below 8 psi and shut down. It runs about 7 to 10 psi when oil pressure switch is unhooked. Looks like I may have bigger problems. Anyone have a suggestion for the next step?
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John R
A new oil pump will most likely fix it up, don't know why the oil pump would go bad though.
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Peddler
At this point where is the oil on the stick relative to the full mark? If you have foamy(air entrained) oil when you drain it you need to get it all out. I do not't see how your oil pressure would be dropping that much if it isn't foaming. Peddler
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MEC
I thought the same thing when I first read it was a 10kW. This is an older vertical drive unit with a 724cc and actually does hold 2qts.
The fill reservoir is tricky on this one.
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Peddler
My apologies, I jumped to the conclusion that this was a more recent version of the 10 KW I didn't run the SN. The only thing I can think of on this unit would be the oil filter extension adapter on the back side of the engine. If the inner O-ring is leaking by it could cause the pressure to bypass. What brand of oil filter are you using? The oil pressure switch is really only measuring the back pressure of the filter on these hence the 8 lbs switch. You should also try straight 40 weight oil to see if that makes a difference in the symptoms. It is a positive displacement gear pump so there is very little to go wrong with it but it could have a leak somewhere inside the engine. Sorry for the mis read on the unit, your may very well take close to 2 quarts. Peddler
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oliver8498
I have tried 40 w oil. I have tried 2 qts and I've tried less oil also. I have tried generac oil filter and others. I too thought that it would be odd the pump would go with no sign of metal. From the parts breakdown the oil pump looks pretty simple with little items for failure. I am getting ready to get deeper into engine. Looking at the oil filter extension lines I'm assuming the adapter plate has o rings that would mock a filter? I'm going to head that route first. Stand by its today's project!
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oliver8498
So i believe i found the problem. In the oil pump area there is a ball bearing that is spring loaded as a pressure release. The ball was stuck open. I was able to bend a small screwdriver and push it out. when i removed the screwdriver it closed right up. IT now moves back and fourth freely. with the ball stuck open to oil flow through the oil filter would be low i think. Before i assemble it back i am going to do some research on this motor from the Briggs and Stratton Side.
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oliver8498
Generator re assembled running for 20 minutes so far and still at 35 psi!! Thank all you for the help!
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78buckshot
Great investigation work, do you think a small piece of debris had the valve stuck open?
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oliver8498
It was hard to tell. The location of the port that the ball sets in is in a tough spot to get in to or see. Hard telling how long it had been stuck open. I bought the set up from a guy for $1200 bucks and I have an idea thats why he got rid of it.
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