440-3 waterpump

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440-3 waterpump

Home > Discussion Forum > Mechanic's Corner - Engines

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All Messages in Thread	Author	Date
440-3 waterpump	Bob	4-7-03
Can anyone tell me what the correct part number is for the 440-3 water pump is ? We have a m-400 chassic and we just bought a tow dolly for our 93 2 door 2 wheel drive jeep cherokee and we gave it a test run and the tempatures going up small grades on the interstate were between 220 and 230 degrees and engine would start pinging. We have done everything but change the water pump to correct the high temps while towing and I just want to make sure I get the right water pump. And also the temps stay at 220 on level grade at 55 to 60 miles per hour but when we exit the interstate the temps drop back to under 190 almost immediately. Thank you Bob
Re: 440-3 waterpump	Dan	4-8-03
Hi in the Dodge motor home chasis parts catalog yr 1978, 440-3 water pump assy, 3780196 this is the part # by the book. Be sure you have 180* degree thermostat. I have used the book parts # thru napa they easily convert to new #s. Dan drive it like ya stole it!! :-)
Re: 440-3 waterpump	Sam Watson	4-9-03
Something sticks in my mind about the correct thermostat for a 440-3. The thread described the heating problem, then the problem was cured by installing the correct thermostat. The Dodge parts book should list the ChryCo number, I know it was different than the 440 engine.
Re: 440-3 waterpump	Bob	4-9-03
Thanks Dan and Sam We have tried all diffrent kinds of thermostats even high flow stats but nothing works and it seems to run the cooliest with no stat at all. go figure! Bob
Re: 440-3 waterpump	Sam Watson	4-9-03
Before I'd replace the waterpump, I'd test it, which is fairly easy to do. Remove the thermostat and the temp. sending unit, and in its place install a pipe nipple---if memory serves me right its 1/8" pipe thread. Attach a 3 foot or so length of suitable hose to this nipple and clamp it on. Pinch off the other end of the hose with ViseGrips and fill the cooling system, leaving it down two inches or so. With the radiator cap off, start the engine and leave it at cold fast idle. Bring the hose end over the radiator fill neck and open the ViseGrips. You should get a healthy stream of water at around 4-6 PSI if the pump is good, plus you should see vigorous circulation by looking into the fill neck. The 440 engine was designed to be in a relative open engine bay where engine heat could be rejected back and down. When a coach builder encloses the engine in a "dog house" cooling problems arise. The fact that you can operate at slower vehicle speeds indicates that ram airflow through the radiator drops off at higher speeds when the flat front end of the coach is pushing a wave of air in front of it, I recall one coach with this problem, a 440 in a blunt nose Robin Hood. It got all kinds of "fixes", including a radiator core replacement with one containing an extra row of tubes. Nothing helped. Finally had to add two electric cooling fans at the rear bottom of the engine compartment blowing backwards in order to pull air through the radiator. I hope you don't have one of those "flex fans" on your rig, these'll give you cooling problems.