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Thermostat Part Number

September 24, 2020, 05:48:40 pm

97 8.3 mechanical

Anyone have a part number for the coolant thermostats? Thanks.
jor

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Re: Thermostat Part Number

Reply #1 – September 25, 2020, 05:00:09 am

My 97 Cummins 325 hp thermostat is 3913028.  This part number is from Cummins Quickserve, online, picture off my phone below..  Up to date part numbers for your particular Cummins.  Add engine serial number, ESN, and you are ready to go. 

"The engine data plate is on top of the timing gear cover, just below the air conditioner pump. Since we have a rear-engine MH, the data plate is upside-down when viewed from the access door.
I found the best way to read everything was to simply take a picture of the data-plate, then just rotate the camera/cell-phone so it is readable. Another upside is, I now have that picture permanently stored for future reference."

Since this will be a summer 2021 maintenance, I will update then if Cummins site showing only one thermostat is accurate or not. They have never been wrong in the past for me, this is my third Cummins mechanical 8.3.

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Re: Thermostat Part Number

Reply #2 – September 25, 2020, 09:38:56 am

on my 98 325 mechanical  thermostat part number from cummins was 3913028
                                            thermostat gasket                                          3913032
                                            thermostat housing gasket                            3913025

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Re: Thermostat Part Number

Reply #3 – September 25, 2020, 12:03:50 pm

Thanks, guys. The book shows two thermostats. Did your 8.3s have two? Pretty sure our setup is identical. Thanks.
jor

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Re: Thermostat Part Number

Reply #4 – September 25, 2020, 01:02:35 pm

Yes 2 thermostats

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Re: Thermostat Part Number

Reply #5 – September 25, 2020, 01:45:57 pm

One last question. Other than Cummins, what is a good source. I checked online and the prices seem to be all over the place. Thanks.
jor

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Re: Thermostat Part Number

Reply #6 – September 25, 2020, 02:09:25 pm

Check Ebay. Cummins wants about $100/ea. Here is a source for about $24/ea delivered: CUMMINS 3913028 THERMOSTAT NEW | eBay

Pierce

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Re: Thermostat Part Number

Reply #7 – September 25, 2020, 04:14:41 pm

Napa is way cheaper then Cummins

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Re: Thermostat Part Number

Reply #8 – September 25, 2020, 09:05:22 pm

My 98 U270 is equipped with a a 1997 325 hp C8.3.  Though many references including my engine manual from Cummins showed two thermostats, mine had one and the part numbers matched the previous two posts. If you follow Jack's reply #1 you would be in good shape to do a replacement. Mine required a seal, thermostat gasket and a thermostat housing gasket, each purchased separately under a unique part number. Cummins Quick Serve was my friend. Also took a picture of the serial number. I went with all OEM parts. When you remove thermostat housing that would be good time to replace shut off valve for coolant filter. There is an improved coolant valve but they also stock the nylon valve. I accidentally got the old valve.

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Re: Thermostat Part Number

Reply #9 – September 27, 2020, 12:37:44 am

Is the 3913028 a 180 degree?

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Re: Thermostat Part Number

Reply #10 – September 27, 2020, 01:52:16 am

Yes 3913028 is a 180 F thermostat, also sometimes listed as 83 C.

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