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I have a 7 kva genset .It will start but runs about 30 seconds then turns of there is plenty of oil fuel seems ok and cooling water ok thanks for any help

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Unhook the oil sensor and see if it will continue to run. If so, relace the sensor. :)

Posted on Apr 19, 2017

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Genset does not start , alarm can't reset


what safety caused the alarm. if you cant restart it, it may be cause the problem that originally shut the engine down has not been fixed, it could be water level, low oil, high water temp, low fuel,over voltage, all of the above are probably run through the safeties. over volt, and water temp would probably clear its self after it sat a while. try turning off power to panel. for a couple minutes and see if it will reset, if not check water level. and oil levels

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Vehicle is turning over but not starting plenty of oil plenty of fuel vehicle was sitting for 3 months so we put good fuel in it also have good battery we put some starter fluid in it and seems to start...


Your fuel pump probably stuck. Use a wood bat or rubber hammer to tap on the tank. Have someone turn the key to on (not crank) with your ear by the tank to see if you can hear it hum for 1-3 seconds. Next replace the filter to remove any water in the lines, and don't forget to put some water remover and octane booster to "fix" the old gas that has gone stale and sucked up water.

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It only gives 15 Volts but no amperage rating?.our genset capacity is 450KVA


KVA is voltage multiplied by current. So if your genset can supply 450KVA at 15 Volts, by dividing 450 by 15 we get the maximum current available to be 30 amps. However you should never draw the maximum current as it would put a strain on the supply. It would be safe to draw up to 25 amps at 15volts

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1975, 7.5 Kohler marine genset, runs only with the reset depresed


Can't search for a manual without model, type, serial, etc numbers...

A few things to take a look at:

1) Oil level / pressure sending unit. This is normally bypassed as long as the start switch is pressed. When engine starts, and switch is released, engine will die if sending unit is defective, or you are low on oil.

2) Exhaust temperature sensors. Older units were notorious for burning these up.

3) Cooling Water Temperature sensor. These cause trouble often, but mostly due to water pump impeller being eaten away by galvanic action and not able to pump water as effecively. End result is water temp higher than normal, which trips the switch, which kills the engine.

4) Alternator (generator) output not as it should. If output doesn't rise to proper level within a few seconds of engine start, the engine will be shut down.

5) Choke not working as it should

6) Bad fuel, bad fuel pump, clogged fuel filter.

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The gent set is Perkins 135 KVA after overhauled it refuses to start please the injector refuses to supply fuel to the nozzle


Check the fuel solenoid is getting power. It may be locked out by loow lube oil pressure and other things.

ALSO when restarting a diesel one OFTEN must "bleed" the fuel lines at each injector... same as when one inadvertently runs a diesel out of fuel. Crack the connectors at the injectors and crank till fuel comes out and tighten each one. Yes, it is a pain...

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Generac Generator won't stay running


It sounds like you are not producing any voltage. When you start your generator have a volt meter on the generator breaker to see if there is voltage present when the genset is running. Also, check you oil pressure switch, which is near the oil filter.

Apr 11, 2009 | Electrical Supplies

3 Answers

Generator is stalling


My answer:

Not knowing your model # and how old your generator really is - as related to TOTAL RUN HOURS - I can only give you several possibilities of what the problem might be even though I don't know the make & model and what the rated WATTAGE output is.

I also don't know what LOAD you are putting on the Genset or at what RPM you are running the engine at as to half throttle or full throttle setting?? I take it that it's a Briggs & Stratton 4-stroke single cyl, or is it a Honda 4-stroke single/twin cyl engine?

Since it runs good for 30 mins, and then starts to cut out - I doubt that the OIL is a problem even though you ran straight 30 weight - seeings most small engines run 10-30 weight oil as a rule.

I seriously doubt you did any damage to the engine at all unless it was ran low on oil - in which case it should have a LOW OIL cutoff switch mounted in the lower engine case close to the CHECK OIL port.

If the LOW OIL switch is working properly and adjusted properly then you shouldn't be getting cutout unless this switch is mis-adjusted. (ie: mechanically set too low as then when the oil level is indeed at it's proper level the switch would be already shorting out to ground) (See your operators manual for proper setting)

A way to check for proper operation is to temporarily disconnect the (usually) BLACK wire from the LOW OIL switch when the engine starts to cut out. If the problem goes away completely then the LOW OIL switch is either mis-adjusted or else it is going bad from vibration. (Again see your operators manual for proper adjustment and/or check out procedure)

Electronically this LOW OIL switch should be the only thing that would protect the engine from damage should the oil level fall below recommended level. Other then that it may have an electronic REV LIMITER if it's a bigger and more expensive model, but usually not.

I doubt the Maintenance-free Magnetron® electronic ignition is at fault, but could be weak and going bad. Always a possibility, but I would 1st rule out everything else first. Since the Genset runs for 30 mins and then starts to cut out I would look more for like a fuel vapor lock (partially closed or clogged gas cap vent), a possible dirty fuel filter, possible water moisture in the gas tank or in the carb bowl, possibly dirty carb in general along with it's dirty Float Bowl, Float Pin, Float and Needle Valve, and any Adjustment Screws that go Into the Carb Body. That covers everything from a fuel standpoint.

You do know that all Gensets should be started and run for at least 10 mins every 30 days - right? If you didn't know this - now you do! Every good operators manual should state this.

It just doesn't sound like it's starving for gas unless it's building up a (vacuum) or vapor lock in the gas tank.

Having covered everything from an Electronics/electrical standpoint engine wise - there is only one other thing left Genset wise.

What it really sounds like to me (and I personally HAVE SEEN this happen myself firsthand) is that the generator brushes are nearly shot - as in almost worn out. They may be getting too too hot - as from excessive current draw at point of contact, and thus the generator sensing circuitry itself is doing an electrical CUTOUT!!

An added protective Genset circuit feature in that the generator itself may indeed be linked to the engine as a type of REV LIMITER on the Maintenance-free Magnetron® electronic ignition. Again - your operators or service manual should have a pretty good troubleshooting section in it unless you don't have that anymore or never got one if you bought it used to begin with.

It has to be one of the scenarios listed above.

Please post me a reply as to the found problem there, and the resolve to it by following my recommendations above. Also please rate my troubleshooting fix as well.

Best regards and thanks,

Frank

Sep 01, 2008 | Coleman Powermate Premium Plus 6250W...

3 Answers

Oil for Coleman Powermate 5000 PM0545305.03


My answer:

First of all - Almost every 4-stroke Genset engine out there should use a minimum 10-30 or else a 10-40 oil blend tops. Best NEVER to use just a straight weight, as in a 30 or 40 weight, as that would be way too "high viscous" at colder temps and could destroy the engine due to overheating at MAX Genset LOADS!

Next - If the Genset is indeed brand new then you need to use the proper fuel in it, as certain mfr's require different fuel blends (such as with certain B&S - Briggs & Stratton - engines), and those engines are set up that way to run on that blend alone. Using the wrong gas blend could damage the engine.

You really need to get a factory Users Manual for your Genset there and read it through thoroughly!

If it has gas in it now (and hasn't run in 3 years?) chances are the whole gas tank, and fuel lines, and Carb as well will need to be cleaned out from contaminated fuel - as there definitely is gum and varnish built up everywhere in those fuel delivery areas esp the most important component - the Carb! Been there - seen that - cleaned that! So I KNOW for FACT.

As for the OIL LEVEL - that is fairly simple - as all you do is unscrew (or in some cases pull out) the dipstick, and check the oil for proper level on the stick as well as cleanness (2 finger test like with car oil), and if it's even black or a silvery color then it definitely needs to be changed out NOW! Refill with fresh oil and your done there.

Check the Air Cleaner for cleanness as well, and service the filter if a foam element, or replace it if a paper element.

If the fuel tank has an in-line fuel line filter and it looks dirty change it out as well. Esp if the gas tank is made out of metal.

Check the spark plug for proper gap, and heat range, and burn color if the Genset has been run already. Should be a nice "light tan" color. If dark and wet - then you have Carb flooding problems.

That about covers it...

Anything else problem wise feel free to ask me here in post follow-up and I'll be glad to answer it for you.

Please post me a reply as to the found problem there, and the resolve to it by following my recommendations above. Also please rate my troubleshooting fix as well.

Keep me posted and I'll follow up as well.

Best regards,

Frank

Aug 20, 2008 | Coleman Powermate Premium Plus 6250W...

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