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10-28-2021, 07:35 PM
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#1
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Senior Member
Holiday Rambler Owners Club
Join Date: Jun 2021
Location: AZ
Posts: 125
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Thermostat for 8.3L Cummins
First and foremost before i get the harp thrown at me i did try the search bar but nothing directly came up on a thread , with that been said I'm looking for a thermostat for my 8.3L cummins. Searched on google but 2 different thermostat pops up anyone have a part number they went off of and place to purchase? Amazons wait time is 2 weeks for the part "they" show with not much info attaching it directly to the 8.3L. It actually looks exactly like the one for my 5.9 cummins .
Thank you all for any help!! God Bless
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10-28-2021, 07:38 PM
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#2
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Moderator Emeritus
Monaco Owners Club Texas Boomers Club
Join Date: Nov 2015
Location: Central Texas
Posts: 13,426
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I ordered it from Cummins, are you registered on Cummins Quickserv?
https://quickserve.cummins.com/info/index.html
__________________
Dennis and Katherine
2000 Monaco Dynasty
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10-28-2021, 07:42 PM
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#3
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Moderator Emeritus
Monaco Owners Club Texas Boomers Club
Join Date: Nov 2015
Location: Central Texas
Posts: 13,426
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The PN for my engine S/N is 3940632, that may or may not be correct for yours. Once you register for quickserv and input your engine S/N, you can look up parts for your exact engine.
__________________
Dennis and Katherine
2000 Monaco Dynasty
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10-28-2021, 07:43 PM
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#4
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Senior Member
Holiday Rambler Owners Club
Join Date: Jun 2021
Location: AZ
Posts: 125
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Quote:
Originally Posted by barmcd
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No im not Barmcd but thank you for that ill jump on there site and get it ordered if it lets me without been registered. TY
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10-29-2021, 05:21 AM
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#5
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Senior Member
Monaco Owners Club Vintage RV Owners Club Holiday Rambler Owners Club
Join Date: Jul 2012
Location: Lexington, SC
Posts: 2,812
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As barmcd suggested get your ESN (engine serial number) and go to https://quickserve.cummins.com/info/index.html. Register your vehicle. It's a great source for info on replacement parts. You can also call Cummins Customer Service ( 1-800-343-7357 ) and give them your ESN
This will help you locate where your ESN is: https://www.dieselpartsdirect.com/fi...-serial-number
__________________
Vera & Ken
1998 Holiday Rambler Imperial, RR8S Chassis
Cummins 6C8.3 mechanical engine, 325HP, 3060 Allison
Towing 2014 Ford Explorer
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10-29-2021, 07:37 AM
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#6
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Senior Member
Monaco Owners Club
Join Date: Jun 2014
Posts: 14,498
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The Quickserve site is a great resource for info and parts information. But buying direct from Cummins can get pricey. I usually get the part number and do a series of searches and pick one that has a good price, seller has good reviews, it's in stock, and the price includes shipping and taxes.
__________________
Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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11-02-2021, 07:48 AM
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#7
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Senior Member
Holiday Rambler Owners Club
Join Date: Jun 2021
Location: AZ
Posts: 125
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Well i did what i was suppose to on the Quickserve Site and it still won't let me log in , just tried again this morning and says login/email is not recognized. Can someone let me know what thermostat takes my 8.3L ISC Cummins? Im trying to do my coolant swap but can't get that info off site. TIA
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11-02-2021, 09:15 AM
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#8
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Senior Member
Alpine Owners Club
Join Date: Oct 2017
Location: Sugar Grove IL
Posts: 409
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If you call your local Cummins dealer with your engine SN, the parts team can look it up and provide a current part number, if it has been updated since the original build. With that number you can check NAPA or another local supplier. I removed mine and took it in for a match. By going to Cummins with the water pump, they informed me that there had been 4 updates to my original water pump number. The pump didn’t look anything like the original but bolted right up. The new version had a much larger bearing hosing and multiple swirl impellers vs. the old. I have occasional had trouble logging into Quickserve as well. Good luck on your repairs!
__________________
Mack Mover
2003 Alpine 40 MDTS
400 ISL
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11-03-2021, 08:23 AM
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#9
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Senior Member
Join Date: Apr 2016
Location: Edmonton Alberta
Posts: 298
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Replaced my stat on my ISB 6.7. Number of part came from cummins. This T-stat has been superseeded 3/4 times. Order from Cummins and pay the price.
One phone call to Cummins and you will have the part. Must have ESN to make sure part is correct.
You can get cheaper stats from other suppliers, are they as good?
My ISB was hard to replace, buy Cummins and do it once.
Price paid to Cummins in Canada was $80.00 CAD
Happy travels
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11-03-2021, 04:48 PM
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#10
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Senior Member
Holiday Rambler Owners Club
Join Date: Jun 2021
Location: AZ
Posts: 125
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Is this the tag that should have my serial number ? Im guessing its the one that got scrapped off with the loom.
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11-04-2021, 06:21 AM
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#11
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Senior Member
Join Date: Nov 2013
Posts: 5,771
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Call Freightliner, they can provide the engine serial number if you can’t find it. Then you can supply that to Cummins or use in QuickServ.
__________________
2015 Tiffin Phaeton 40QBH
2018 Chevrolet Colorado Toad
Roadmaster Tow Setup
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11-04-2021, 08:08 PM
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#12
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Senior Member
Holiday Rambler Owners Club
Join Date: Jun 2021
Location: AZ
Posts: 125
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Well i still didn't locate the ESN , so i pulled out the thermostat and water pump and called cummins/parts. Below are the original part# for WP and new part# for the thermostat incase someone could use this info.
An this is for an ISC 350:
Thermostat original part# : 3940632 / New Part number# 5284903
Water Pump: 3286293
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11-05-2021, 06:22 AM
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#13
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Senior Member
Join Date: Nov 2016
Location: Oregon occasionally, Baja often
Posts: 659
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Our 1996 Cummins 505ci (aka '8.3qt' in foreign talk) uses two thermostats.
A couple-three years ago, we acquired them from our neighborhood local-owned family-operated parts house.
In stock.
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11-06-2021, 03:44 AM
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#14
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Senior Member
Join Date: Sep 2016
Location: Sarasota, FL
Posts: 5,228
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My 8.3 has 2 thermostats - as others have said, take engine ser# to any Cummins or big truck place and have them look it up.
__________________
Rick and Larrie Dee
1997 40' Newmar London Aire DP CTA 8.3 (Mechanical) 325 Spartan MM
Bringing her back to her glory.
'08 Jeep GC Overland.
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