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  #91  
Old 02-12-2015, 04:14 PM
kerley kerley is offline
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Thank you,
I bet my Cummins has the 180* thermostat because our truck was ordered, waited three months for delivery because it was not built yet. I will pull it and see,
Thank you for the help.
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  #92  
Old 02-12-2015, 04:19 PM
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KATOOM KATOOM is offline
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No problem. But what makes you think you have a 180* thermostat? Whats the normal running engine temps?
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  #93  
Old 02-12-2015, 04:53 PM
kerley kerley is offline
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It runs right at 180* now and there is no problem, I was told the 190* would perform better and increase fuel mileage. I have a 1998.5 Ram/Cummins with 202k 4x4 5speed. I am the second owner, my buddy in Nevada passed away and willed the truck to me. I paid 900$ shipping in 2005. The first time I drove it was around 2009, I drove about fifty miles, dead on the side of the road and towed to a Diesel repair shop where they installed a new or rebuilt vp44 and OEM lift pump for 2900$ plus they stole the OEM steps and spilled something on the hood which has ate the paint off. They were really thieves and AZZ HOLES to boot. When I got home I hit the PC Internet looking for info. on Dodge/Cummins, I then joined Diesel Bombers and every Diesel Truck Web sight I could find, then I installed my Autometer fpg and Fass ddrp, I will have the pyrometer and Boost guages completed tomorrow. This truck has been a real challenge for me but I've replaced and upgraded many items and I am not finished yet. I read most everything available about my truck and someone will buy a darn good running Dodge Cummins when I am dead and gone.
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  #94  
Old 02-12-2015, 05:09 PM
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KATOOM KATOOM is offline
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Wow, what a story. Sorry about your friend and sorry about the pathetic shop too.

If the thermostat is a 180* then you can give the 190* a try. Just make sure you get either a NAPA (cheaper) or Cummins (more expensive) thermostat and make sure its the correct one too. It should have a rubber ring around the outside edge and there should be two "jiggle pins" in the plate too.
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  #95  
Old 02-13-2015, 10:07 AM
kerley kerley is offline
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KATOOM,
Thank you for your help. What part of Northern California are you. I am a retired contractor and have worked all over northern Calif and Nevada. Just curious and always amazed at the far reach of the internet.
Kerley.
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  #96  
Old 02-14-2015, 04:03 PM
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rlane547 rlane547 is offline
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Tom, we ran 190 degree thermostats in our 12v when I worked for a bakery. We bought them at Autozone and I'm working on finding that part number for you. We changed everyone of ours from 180 to 190. Also, I may be way off here, but if memory serves me right, there was a tang on the thermostat housing where you had to line up the jiggle pin. The jiggle pin is used to vent the air when filling the coolant and also as a check valve. With the thermostat closed there is still a small amount of coolant getting by to the radiator because the flow comes by the injectors and heads straight into the thermostat. If the jiggle pin wasnt positioned correctly the bypass would be closed off and I believe you would get a water hammer effect. Like I said, I may be way off. These engines were from 1984 or so, before they began putting them in pickups.
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  #97  
Old 02-14-2015, 05:57 PM
kerley kerley is offline
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rlane547,
Thank you for this information. My 1998.5 24valve Cummins runs right at 180* running empty or pulling a load of hay. I called Napa and they had a Thermostat 190* for 24.99 all gaskets included and it is for a 1998.5 like mine. I appreciate your post, now I don't feel like I'm gambling.
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  #98  
Old 02-14-2015, 06:55 PM
98whitelightnin 98whitelightnin is offline
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My 98 called for a 180 too but I always ran 190 and it ran great. I just pulled the 180 out of my 12v for one of the eBay "Non fluctuating" 195* thermostats and it still fluctuated but not as bad and not on the low side of 195. It lost 1.5 mpg so I put the old 180 back in.
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  #99  
Old 02-14-2015, 08:40 PM
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That seems a bit strange to loose any mpg when running warmer. I suspect part of my fluctuation may be in the sending unit. I broke it when I pulled the head the first time. I bought another one from NAPA and then my gauge would barely make it above the low mark so I managed to "repair" my old one so it reads closer to what it used to.
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  #100  
Old 02-14-2015, 10:18 PM
kerley kerley is offline
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Default Thermostat

MnTom, Parts stores sell parts but I feel that Cummins engineered every part on my Cummins engine, with that said I buy all electrical parts except a starter or alternator from Cummins, you get what you pay for at Cummins.
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