Western PA M923A2
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Hi Will. By ESN you mean engine serial # on the block? If yes, where would I locate it?
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1991 BMY M923A2 loses heat when temp gauge hits 200 degrees
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Western PA M923A2
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And the stat in the pic was the top external stat, not from below... there wasn't one in there at all.
Ford Mechanic
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Honestly I didn't check the TM, I called Cummins with my ESN and had them email me the breakdown. I pulled all my numbers from their documents and ordered all the parts from them.
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Western PA M923A2
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Okay, cool. Where on the engine is the ESN located?
Ford Mechanic
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Timing cover, drivers side of engine. Should be a silver and red plate.
That t-stat looks oddly familiar for some reason and I can't put my finger on it.
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Western PA M923A2
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Well that's the stat that was in there when I opened it up... probably the same as in yours
Ford Mechanic
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I think your right, but it was replaced by a different design. I belive the one I replaced it with looked like the other one shown in the pic a couple post back. So far so good I've put alot of miles on it, it was before the Graves mountain rally on Labor day.
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Ford Mechanic
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If the timing cover has been replaced at any point it may not be there anymore.
The tag will be just above the IP.
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The tag will be just above the IP.
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Western PA M923A2
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I was at NAPA tonight and was going to get the one that's supposed to be the compatible to the Cummins OEM stat, and I had my housing with me just to be sure it fit properly... and IT DIDN'T! Guess I'm getting mine straight from Cummins
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If the data plate is not up by the front cover the ESN can also be found stamped on a boss on the left rear of the engine block
Western PA M923A2
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I just walked over to where I have it parked and got the number as well as the build date
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You may want to get the CPL if you can as well if you have a data plate
Western PA M923A2
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Got it... I took pics of the plate. What's the CPL stand for?
What is the number on the thermostat you used? or attempted to see would fit.
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Nope, not on midrange engines until 2006 or 2007.
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CPL...Control Parts List. It lists the performance parts, pistons, cam, head, injectors. CPL identification has gone the way of the DoDo, ESN is how everything is tracked now in Cummins parts system, until someone come in with an engine made before 1980 
Western PA M923A2
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The site is back up... cool! I returned the stats I got at NAPA and went with the OEM Cummins 3913028. Turns out there's a Cummins distributor like 7 miles from my house. I'll be putting it all back together on Sunday, so we shall see....
Western PA M923A2
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Tonight it's not too cold here YET and the motivation kicked in, so I yanked the water pump off the beast just to see what she looked like, and it looks pretty foul. Lots of crusty formations on the impeller blades, and having it out in my hands, it's NOT spinning as smoothly and freely as it seemed it was while it was still mounted and I spun it by hand, so a no-brainer here - REPLACE IT.
You can get most of the junk in the system out with this stuff. You also should pull any coolant access covers and clean them out.
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Those pumps don't spin freely, they are tight. If the impeller is in tact, looks good in the pic, and there is nothing in the weep hole, it is fine. But it is your money. There are two types of Restore. One removes grease/oil/gelling and the other is a de-scaler.