do they make a waterpump for a bigcam 1 thats got a castiron impeller or are they all plastic. I put a pressure guage on it would not move,pulled the waterpump today the plastic impeller was just spinning in the shaft.
did they have problems with all bigcam cummins waterpumps or do you think it could be air pocket in the system. ( 350 hp ) spark - ignited, turbocharged and after- cooled Cummins ' Big Cam ' propane engine was developed and tested for class 8 truck application. James i have a 350 Bigcam the top of the radiator gets hot (140}degrees but the bottom is degrees and the motor runs 180, the water dosent seem to circulate. In the USA there was also a Big Cam 4 engine, but the local Cummins marketing people thought the ‘Big Cam. characterised by being called ‘Big Cam 1, 2 and 3’ engines. If you pull one of these pumps, and find part of the vanes missing, do not pass go or collect 200 dollars, but pull the oil cooler and clean it out before using the truck. The legendary 855 cubic inch (14-litre) Cummins engine had its origin in the late 1950s as the NH model, initially rated in Australia at 250hp. Due to cavitation, over time they will sometimes lose the vanes. They are prone to turn loose and spin on the shaft. Cummins uses a lot of phenolic impellers in replacement pumps.
If the bottom is a lot hotter, it is not circulating. A quick test for a suspect Cummins water pump is to attempt to lay your hand on both top and bottom radiator tanks, when the engine is showing hot.
If no manual switch, jump the solonoid with a test lead to make the fan operate, and test drive it. If it is air operated look for a manual switch. Whether viscous or air operated the fan clutch would be the first suspect. Joe, on models with Horton, or similar fan clutches, the same Kysor shut down also controls the fan clutch. He replaced the water pump with no luck and is wondering what to look for next. Bobtailing it does fine, but even pullin his savannah log trailer around EMPTY it'll try to heat up. Just the least little incline it'll heat up then shut it's self down. The truck is a low mileage truck around 400,000, and the fuel is set on the factory settin. He was haulin full time with the truck but bought a Western Star and only uses the cabover to pull a reefer trailer around a 100 mile round trip on saturday. Thank you for choosing this mod! Please keep for updates.A buddy of mine has a '86 International cabover that has all of the sudden started overheating on the least little hill. At this moment only Peterbilt 359 is supporting, but i added other trucks just for testing these engines. Series NH / NT Big Cam II Rated Speed 8 55 40/70 276/483 8 55 25/45 172/310 VT - 350, V - 903, VT - 903 5 34 40/65 276/448 V. Please note, these engines were designed for Peterbilt 359/362/379 etc.
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