Onan 7500 Gen Temp Sensor Repair

Рет қаралды 8,045

3 жыл бұрын

Onan 7500 Generator in my motorhome was shutting down about every minute or so and showing a fault code of 1 blink indicating an over temperature condition. While there can be several causes for this condition, the most frequent cause is a failed temperature sensor. This sensor is very difficult to remove and replace due to its location and the fact that it is made with a soft brass housing. This video shows how the original sensor can just be left in place and a new sensor can be installed once a port in the thermostat housing is tapped to allow the new sensor to the screwed in place. If this is your problem, you will find this video most helpful.

Пікірлер: 25

@TruckingTrucks 7 ай бұрын

Appreciate your time to make this video and thinking outside the box! I will remember the Newton repair when telling my friends. Thank you!

@user-qi9xv6jf4e 5 ай бұрын

Glad it was helpful!

@user-qi9xv6jf4e 3 жыл бұрын

Since installing the new temperature sensor as shown in the video, we have taken an extended trip in our motor home running the generator in excess of 24 hours. It ran overnight on two separate days and did NOT shut down at any time. This is a good practical test that the sensor is performing properly.

@robertgoodman9391 20 күн бұрын

You have another update on this project? Still working fine? I think the one challenge to your plan (sensor couldn’t sense overheating if thermostat failed)was answered when your gen shut down when you ran it with the cover off. I am about to replace my sensor or just do your modification

@cbcarper9681 Жыл бұрын

Thank you for showing me all of that. I have the exact generator. I really appreciate it.

@mmkmike 10 ай бұрын

Good job. I like the alternative practical thinking.

@insightsbk 10 ай бұрын

Outstanding outside the box thinking

@ToddM452 2 жыл бұрын

Perfect! Good and solution and video.

@zjtr10 2 жыл бұрын

Thank you for taking the time to make the video. I believe you have shot yourself in the foot when you changed the location of the temperature sending unit. As you have it now you are measuring the temperature of the water past the thermostat. If the thermostat sticks shut the sending unit will never see hot water and shut the engine down.

@user-qi9xv6jf4e 2 жыл бұрын

To each his own. If you don't want to use this modification its up to you, but I assure you if you get to the point where you can't remove the original temp sensor, you will be looking for other options. The sensor only is responding to a too high a temp and shuts the gen set down. So if the thermostat does stick shut then the temp of the gen coolant water and surrounding metal is going to heat up very quickly, the sensor in this new location will see this elevated temp and shut it down. I know that will happen as I have shared in the video.

@Geneexpert Жыл бұрын

@@user-qi9xv6jf4e I needed to replace my temp sensor as well for a different code and I was able to get the sensor out but the tip broke in the housing, so I did your modification and now I get error 1 overheat. So I took it back apart and drilled a hole in that cavity put it back together and still get the same error. 2004 tiffin phaeton 35rh with 7.5 onan 60 hours on gen. your thoughts?

@user-qi9xv6jf4e Жыл бұрын

@@Geneexpert Did you also replace the thermostat. If it is stuck closed it will also cause the gen to overheat and give the same error. Did you run the gen with the top panel at least laid back in place (doesn't have to be bolted down)? If the panel is not put back in place then the fan will not be pulling air through the radiator and it will overhear. Has the radiator been flushed out recently? Is the outside of the radiator dirty? Just some thoughts to think about.

@robertgoodman9391 20 күн бұрын

@@Geneexpert what code were you getting and did you ever solve your problem? I am about to pull my gen out to replace my coolant temp sensor for fault code 24 (not sensing a temp change within first 5 minutes of running) that shuts it down in 5 minutes every time I try it. I thought my biggest problem was getting gen out but now I see it’s going to be removing the sensor

@insightsbk 9 ай бұрын

Just completed modification thanks for creating this video. I do have one question did you cut a hole to allow fluid to sensor?

@user-qi9xv6jf4e 9 ай бұрын

I did not cut a hole to allow direct contact with the coolant. I believe I covered that in my video.

@insightsbk 9 ай бұрын

How is mod holding up?

@frankram2303 Жыл бұрын

What code did you get when you had the problem??? Thanks

@garykennealy3245 2 жыл бұрын

any chance you havve a part number for that housing, ours is different and I am out of options. Thank you

@user-qi9xv6jf4e Жыл бұрын

Gary sorry for the delayed response as I don't monitor this channel very often. As to the part number for the "housing" I am assuming you are talking about the housing that is removed to get at the thermostat and which I was able to tap out the hole that was already there. Unfortunately I don't have that part number but you might be able to google Onan Genset 7500 diesel year 2005 and get to a parts diagram and find it that way.

@wayneriley7315 5 ай бұрын

Did the gen shut down when driving with basement ac running

@user-qi9xv6jf4e 5 ай бұрын

Sorry, I don't monitor this site very often, but to answer you question: I don't have a basement AC unit on my motorhome but I do have 2 overhead AC units. I have run one or both of them at times while boondocking overnight. On these occasions, the gen has run for at least 8 hrs without shutting down. At times We also run it while driving without any shut downs.