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Topic: Coolant level sensor location, ISM? (Read 1396 times) previous topic - next topic

Coolant level sensor location, ISM?

Over the weekend I fired up my coach to let it run a bit as it hasn't moved in a month or so.  While it started fine and had oil pressure, the stop engine light was on, then the engine stopped after 30 seconds of running.  It did restart and the light went out after about 10 seconds or so the next go around.  I looked up the code on the VMSpc and it came up as a coolant level sensor.  The overflow is above the cold mark, so I'm guessing it's the sensor.  Where is this sensor located?  I could not find it through Cummins Quickserve by serial number searching for coolant sensor.

Is it on the reservoir (see circled sensor in picture)?

Re: Coolant level sensor location, ISM?

Reply #1 –
Yes It is on the coolant tank and I carry a spare if you need. Also carry a cam position sensor. Both will strand you
Edit; 4-4-2023 speed sensor in trans also

Re: Coolant level sensor location, ISM?

Reply #2 –
Quote from: dsd –
Yes It is on the coolant tank and I carry a spare if you need. Also carry a cam position sensor. Both will strand you

Scott do you have the part numbers? Something I need to carry  also.

Re: Coolant level sensor location, ISM?

Reply #3 –
Thanks Scott, no trips planned yet, but if you could share the PN, that would be great.  I'll get one incoming.

Re: Coolant level sensor location, ISM?

Reply #4 –
I'll get numbers tomorrow. I think I have posted both but running around

Re: Coolant level sensor location, ISM?

Reply #7 –

CUMMINS SENSOR,POSITION PART NO.3078150
CUMMINS SENSOR,POSITION PART NO.4326595 3049092 3073894 3078150 3078151 3408502
CUMMINS SENSOR,POSITION PART NO.4326595 3049092 3073894 3078150 3078151...

Coolant sensor
4903489 3612521 1673785C91 1673785C92 Coolant Fluid Level Sensor witch...

Could not find a Cummins OEM Usually 160$ im currently running a knock off but carry a spare for that also.
Ill look at my part in hand tomorrow

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Re: Coolant level sensor location, ISM?

Reply #9 –
Just to add for some of those that have a sensor that looks different than the ones listed. On some coaches they used a Robert Shaw/ Mini Tek sensor @#086714A0001.  They do the same function just make sure that the threads are the same as what the new style sensors have.

Mike

Re: Coolant level sensor location, ISM?

Reply #10 –
Went to install the replacement sensor today.  Looks like it wasn't an problem as when I removed it, no coolant came out.  It seems that while the overflow was sitting at "full cold", there was nothing in the metal reservoir.  I reinstalled the sensor and poured in about 2.5 gallons of new coolant to top off the reservoir.  I guess I'll add the new sensor to my spares kit.

Re: Coolant level sensor location, ISM?

Reply #11 –
You have either a bad radiator cap or a leak between the metal tank filler cap and the reservoir. The reservoir holds the expansion water and returns it when the engine cools.

Re: Coolant level sensor location, ISM?

Reply #12 –
Quote from: craneman –
You have either a bad radiator cap or a leak between the metal tank filler cap and the reservoir. The reservoir holds the expansion water and returns it when the engine cools.

And some important details from craneman in an older topic (Just Got Our First Foretravel - Renovations Started):

Quote from: craneman –
To add to the radiator cap issue all pressure caps have the spring and the rubber seal at the bottom. Recovery caps have an additional rubber right at the bottom of the cap face. Without the additional rubber seal it will not pull vacuum.

Make sure you have (or are replacing with) the proper recovery cap.

Re: Coolant level sensor location, ISM?

Reply #13 –
On the Cam position sensor topic. I see the off brand price under $30. the cummins part at $260, I'm looking to have one as a spare to avoid being "stranded" . Opinions Please

Re: Coolant level sensor location, ISM?

Reply #14 –
Quote from: Bill Petersen –
On the Cam position sensor topic. I see the off brand price under $30. the cummins part at $260, I'm looking to have one as a spare to avoid being "stranded" . Opinions Please
where it me I go for the aftermarket as their are a lot of options out there. I'm running an aftermarket exhaust manifold including gaskets bolts s and spacers for a little over 400 bucks. Cummins wanted 1200 bucks just for the manifold. Don't get me wrong, bolt on parts are one thing. But major parts reman heads, injectors, pistons, rings and so on Cummins only.

Re: Coolant level sensor location, ISM?

Reply #15 –
Bill,

I'm in the same boat as Bruce as I carry an aftermarket cam sensor. After looking at your profile and seeing you have a 320. Make sure you have a wrench that fits in the hole to remove/install the sensor. Seems like there is a post from some time back that shows the wrench that several have made to reach the sensor. I will hunt around see if I can find that post and link it here for you.

Mike

Here is one thread that shows the magic tool for the oil pressure sensor but is the same thing for the cam sensor.  Mine is made from a socket but this gives you an idea as to what you need. If I find another thread I will post it also. ISM 500 Low Oil Pressure Warning in Rain

Re: Coolant level sensor location, ISM?

Reply #16 –
Quote from: Pamela & Mike –
Bill,

I'm in the same boat as Bruce as I carry an aftermarket cam sensor. After looking at your profile and seeing you have a 320. Make sure you have a wrench that fits in the hole to remove/install the sensor. Seems like there is a post from some time back that shows the wrench that several have made to reach the sensor. I will hunt around see if I can find that post and link it here for you.

Mike

Here is one thread that shows the magic tool for the oil pressure sensor but is the same thing for the cam sensor.  Mine is made from a socket but this gives you an idea as to what you need. If I find another thread I will post it also. ISM 500 Low Oil Pressure Warning in Rain
Ism oil pressure
Cam sensor is different that oil sensor