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 > Onan marquis 7000 shutting off after like 15 min/overheat

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Chrisbouch

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Posted: 08/29/22 04:39pm Link  |  Quote  |  Print  |  Notify Moderator

I know it's overheating, but this is air cooled a d don't see any blockage in the grate. Is this likely a thermostat?

MountainAir05

New Mexico

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Posted: 08/29/22 04:57pm Link  |  Quote  |  Print  |  Notify Moderator

low oil, sucking air in the gas line.

Put a new gas line on and drop in a fresh gallon of gas.

RLS7201

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Posted: 08/29/22 04:59pm Link  |  Quote  |  Print  |  Notify Moderator

Which Onan Marquis 7K gas do you have? QG or NHM.

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Lwiddis

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Posted: 08/29/22 05:40pm Link  |  Quote  |  Print  |  Notify Moderator

Like, could be a number of things. Low oil is probably the culprit. Last oil change by hours is?


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Chrisbouch

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Posted: 08/29/22 05:55pm Link  |  Quote  |  Print  |  Notify Moderator

It's the same gas that's in my Gulfstream, so seems to be doing okay. Not sure the generator model. Does this help model number 7hgjab-9000

theoldwizard1

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Posted: 08/29/22 07:16pm Link  |  Quote  |  Print  |  Notify Moderator

Exhaust leak.

FloridaRosebud

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Posted: 08/29/22 07:17pm Link  |  Quote  |  Print  |  Notify Moderator

How do you know it's overheating? What is the engine code? My 5500 would stop after 15-30 minutes, and it was the fuel pump. How many hours do you have on the Genny?

Al

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Posted: 08/30/22 06:19am Link  |  Quote  |  Print  |  Notify Moderator

FloridaRosebud wrote:

How do you know it's overheating? What is the engine code? My 5500 would stop after 15-30 minutes, and it was the fuel pump. How many hours do you have on the Genny?

Al


Mine did the same thing, fuel pump as well. New fuel pump, problem solved.


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Chrisbouch

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Posted: 08/30/22 07:46am Link  |  Quote  |  Print  |  Notify Moderator

Not getting a code. Maybe it's not overheating you're right. I guess it could be a fuel pump or the exhaust leak. Exhaust leak sounds right honestly as it's hotter than heck and the hot air seems to be blowing as much out of unit as it does out the exhaust and works when cold weather

way2roll

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Posted: 08/30/22 08:08am Link  |  Quote  |  Print  |  Notify Moderator

Chrisbouch wrote:

Not getting a code. Maybe it's not overheating you're right. I guess it could be a fuel pump or the exhaust leak. Exhaust leak sounds right honestly as it's hotter than heck and the hot air seems to be blowing as much out of unit as it does out the exhaust and works when cold weather


If you are sitting still on a hot day and they are running hard it's not uncommon for these gensets to shut down with an overheat code. The genset panel inside would show a code if that happens.


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