Skip to main content ↑ ↓
Topic: What is the correct Thermostat for a 2000/ISM 450? (Read 380 times) previous topic - next topic

What is the correct Thermostat for a 2000/ISM 450?

I'm trying to hunt down the current Cummins P/N for the thermostat (180-201 full open / non vented) for a 2000 U320 ISM, engine (build data Nov99)

The customized parts catalog for my ESN lists P/N 3335550 - however this is no longer a valid number on the shop Cummins site. Looking it up on quickserve / parts catalog it lists the following lineage
  • 3335550 Obsolete > 4973373 Obsolete > 2882757 Obsolete > 4318197 Obsolete > TSB 4318947 Current??

P/N 4318947 is available on the shop site and was mentioned/purchased in another post. Also mentioned/purchased in another post was P/N 3076489 is also available on the parts site.  When I do a "Check compatibility with your equipment" on the site, using my ESN, both come back as not compatible.  Anyone know what is the correct part number ??

Then there is the Thermostat Seal.  In the customized part catalog under EC2701 Thermostat it lists P/N 3335548, and under the Thermostat Housing TH2064 is shows P/N 186780. Any idea on which of those is correct/compatible?

I attached the TSB for reference, which details why 4318197 was obsoleted.

Are there any other seals that are needed to do the thermostat change?

Now I don't wonder why the parts guy face goes blank when they have to look up a part!
2000 / 36' / U320 / WTFE
WildEBeest / "Striving to put right what once went wrong"

Re: What is the correct Thermostat for a 2000/ISM 450?

Reply #1 –
Here is what I have in records from when I researched this around 5 years ago: 180/201 ISM 333555C (or 0 instead of C?) , 4973373, 431
Dan - Full timing since 2009
2003 U320 40' Tag 2 slide

Re: What is the correct Thermostat for a 2000/ISM 450?

Reply #2 –
Amazon.com: Thermostat 3335550 4952204 4973373 2882757 4318197 for Cummins...

2882757 3335550 Thermostat 180° Fits for Cummins ISX N14 L10 Engine | eBay

3335550 thermostat for Cummins ISX QSX

4318947 THERMOSTAT (4952204, 3335550, 4973373, 2882757, 4318197) - Reliable...

4318947 | Cummins Thermostat | ISX | QSX | Diesel Parts Direct

As an Amazon Associate Foretravel Owners' Forum earns from qualifying purchases.
Dan - Full timing since 2009
2003 U320 40' Tag 2 slide

Re: What is the correct Thermostat for a 2000/ISM 450?

Reply #3 –
Dan,

Thanks, based on those links and numbers, it appears as P/N 4318947 is the current one for the thermostat.  One of the links had the TSB linked as well and showed the P/N lineage that I found.  At least if its wrong I now have someone to blame ;D
2000 / 36' / U320 / WTFE
WildEBeest / "Striving to put right what once went wrong"

Re: What is the correct Thermostat for a 2000/ISM 450?

Reply #4 –
4318947 is the thermostat number that was given to me by Cummins.  I was going to replace the thermostat when I did my coolant flush and fill but it turned out that it was way more difficult to get to than I thought it was going to be and I was short on time.  Since I had not had any cooling problems I decided to not open up that can of worms.  So the thermostat wound up in my spare parts box.
George Mann
2002 U320 #5934
2017 Rubicon
2013 BMW GS
Waterford MI
 

Re: What is the correct Thermostat for a 2000/ISM 450?

Reply #5 –
Thank you for the confirmation on the P/N ... parts ordered !
2000 / 36' / U320 / WTFE
WildEBeest / "Striving to put right what once went wrong"