Re: engine overheats, upper radiator hose cold, thermostat works
[Re: A727Tflite]
#3052369
06/22/22 11:35 AM
06/22/22 11:35 AM
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Joined: Oct 2007
Posts: 734 New York
R/T1968R/T
super stock
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super stock
Joined: Oct 2007
Posts: 734
New York
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Just fixed a 440 that had a marine impeller on the water pump. The impeller was made to spin backwards. Double check the direction its facing. Here's a reverse one!
Last edited by R/T1968R/T; 06/22/22 12:32 PM.
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Re: engine overheats, upper radiator hose cold, thermostat works
[Re: R/T1968R/T]
#3052383
06/22/22 12:07 PM
06/22/22 12:07 PM
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Joined: Jan 2004
Posts: 8,236 fredericksburg,va
cudaman1969
master
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master
Joined: Jan 2004
Posts: 8,236
fredericksburg,va
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Just fixed a 440 that had a marine impeller on the water pump. The impeller was made to spin backwards. Double check the direction its facing. Here's a reverse one! Looks just like the normal one I have
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Re: engine overheats, upper radiator hose cold, thermostat works
[Re: cudaman1969]
#3052398
06/22/22 12:36 PM
06/22/22 12:36 PM
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Joined: Oct 2007
Posts: 734 New York
R/T1968R/T
super stock
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super stock
Joined: Oct 2007
Posts: 734
New York
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Just fixed a 440 that had a marine impeller on the water pump. The impeller was made to spin backwards. Double check the direction its facing. Here's a reverse one! Looks just like the normal one I have These are not my pictures of the one I fixed. One of these is a reverse pump for sure.
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Re: engine overheats, upper radiator hose cold, thermostat works
[Re: Sniper]
#3052472
06/22/22 05:34 PM
06/22/22 05:34 PM
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Joined: Jan 2010
Posts: 1,442 NW Chicago suburban area
Mopar Mitch
pro stock
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pro stock
Joined: Jan 2010
Posts: 1,442
NW Chicago suburban area
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Sniper -- T/Anks for that information about the spring in the lower hose... I have only found new hoses WITHOUT the internal spring... puzzled me, figured it was a cost factor for the aftermarket replacements.
I recently changed my lower hose (as it was slightly leaking at the water pump neck hose connection.... hose probably 30+ years old!)... and had some overheating issues afterwards... and excessively high radiator and hose pressure. So, after it wanted to explode upon eventually releasing the cap (couple days!), I then ran my engine without the cap, without a thermostat.. and eventually saw big bubbles... blurps... coming out of the radiator... I obviously had some air pockets. IF it made any difference, my radiator is a new aluminum Triple-Flow design from U.S. Radiator.... down-up- down.
Mopar Mitch
"Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers!
Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!
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Re: engine overheats, upper radiator hose cold, thermostat works
[Re: 440_Offroader]
#3052694
06/23/22 12:12 PM
06/23/22 12:12 PM
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Joined: Jan 2003
Posts: 14,492 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,492
So. Burlington, Vt.
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It there is proper coolant flow through the engine prior to the stat opening, then the heater hoses and bypass hose should be getting hot.
If they’re not warming up fairly quickly, there is likely some sort of water pump problem.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: engine overheats, upper radiator hose cold, thermostat works
[Re: Exit1965]
#3053340
06/25/22 06:48 PM
06/25/22 06:48 PM
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Joined: Dec 2007
Posts: 1,357 central Florida
VL21
pro stock
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pro stock
Joined: Dec 2007
Posts: 1,357
central Florida
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Back when I was in high school I had a '64 Valiant, 225, that developed an intermittent over heat issue.
Turned out that the factory fit plastic impeller was basically free on the pump shaft, but had a little grip, when it felt like messing with me, the impeller would shift just enough in the pump cavity to stop it, fan still turning happily, no belt squeal, but no circulation either.
This didn't happen all the time, but every once in a while I would look at the gauge and the needle would be heading for the high side.
I was so glad when they stopped using those damn plastic impellers ...
It takes gasoline to interest me.
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Re: engine overheats, upper radiator hose cold, thermostat works
[Re: Exit1965]
#3053622
06/26/22 07:40 PM
06/26/22 07:40 PM
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Joined: Aug 2003
Posts: 43,127 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,127
Bend,OR USA
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Well I put it back together without thermostat, and indeed the water pump was stirring things up in the radiator. I put a 1/8" hole in the thermostat, put it back in, added coolant mix burping it as I go. Started it up and it's running great. I think I must have been low on coolant and/or air pockets. Good find, now go drive it in the heat slowly to make sure you fixed it Let us know please
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: engine overheats, upper radiator hose cold, thermostat works
[Re: R/T1968R/T]
#3054056
06/28/22 10:02 AM
06/28/22 10:02 AM
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Joined: Jun 2019
Posts: 744 Almost Heaven
Bob Stinson
super stock
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super stock
Joined: Jun 2019
Posts: 744
Almost Heaven
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Just fixed a 440 that had a marine impeller on the water pump. The impeller was made to spin backwards. Double check the direction its facing. Here's a reverse one! FWIW I put a Milodon HV pump on my car recently and it's reversed compared to the one I took off. I then compared the one I took off to two other old ones I had and they are all oriented the same way. The Milodon part number was clearly marked for CW rotation. I got it from Mancini. https://www.manciniracing.com/brbhigvolwat.html
69 road runner A12 ex-racer 71 Duster w/ a 400
Shiny paint causes stress.
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Re: engine overheats, upper radiator hose cold, thermostat works
[Re: Bob Stinson]
#3054180
06/28/22 06:48 PM
06/28/22 06:48 PM
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Joined: Jan 2003
Posts: 7,477 Minnesota
Hemi_Joel
master
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master
Joined: Jan 2003
Posts: 7,477
Minnesota
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Just fixed a 440 that had a marine impeller on the water pump. The impeller was made to spin backwards. Double check the direction its facing. Here's a reverse one! FWIW I put a Milodon HV pump on my car recently and it's reversed compared to the one I took off. I then compared the one I took off to two other old ones I had and they are all oriented the same way. The Milodon part number was clearly marked for CW rotation. I got it from Mancini. https://www.manciniracing.com/brbhigvolwat.html Both of those pumps have the impeller blades at 90° to the centerline of the shaft. They would both perform equally whatever direction they spin. The orientation of the arms holding the impeller blades is irrelevant.
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: engine overheats, upper radiator hose cold, thermostat works
[Re: Hemi_Joel]
#3054295
06/29/22 09:20 AM
06/29/22 09:20 AM
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Joined: Jun 2019
Posts: 744 Almost Heaven
Bob Stinson
super stock
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super stock
Joined: Jun 2019
Posts: 744
Almost Heaven
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Just fixed a 440 that had a marine impeller on the water pump. The impeller was made to spin backwards. Double check the direction its facing. Here's a reverse one! FWIW I put a Milodon HV pump on my car recently and it's reversed compared to the one I took off. I then compared the one I took off to two other old ones I had and they are all oriented the same way. The Milodon part number was clearly marked for CW rotation. I got it from Mancini. https://www.manciniracing.com/brbhigvolwat.html Both of those pumps have the impeller blades at 90° to the centerline of the shaft. They would both perform equally whatever direction they spin. The orientation of the arms holding the impeller blades is irrelevant. Thanks for the reply. I got a little paranoid because I had been reading a thread on the HAMB that talked about reversed water pumps on GM cars with serpentine systems, so I checked the description on Mancini's website before installing it. The main difference I noted in the HV pump was longer blades and that plate welded behind them. Some of the old pumps had 6 blades, others had 8, I figure that is A/C vs non A/C.
69 road runner A12 ex-racer 71 Duster w/ a 400
Shiny paint causes stress.
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Re: engine overheats, upper radiator hose cold, thermostat works
[Re: R/T1968R/T]
#3054622
06/30/22 10:16 AM
06/30/22 10:16 AM
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Joined: May 2019
Posts: 6,227 nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,227
nowhere
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Now I'm totally confused. Why would Mancini state CW rotation if there was no difference? I pulled many boat motors and there was definitely a difference between left and right rotation motors. Have you never seen an incorrect description for a part before? Straight vane pumps don't care, especially if you have an anti-cavitation plate on it. Curved vanes do. From Cardone. Impellers must turn in a direction so that the fluid is pushed (not scooped) through the pump (see sample drawing below). Exceptions are pumps with straight vane impellers (vanes perpendicular to the shaft) and shrouded impellers. Straight vane impellers function in either direction. Shrouded impellers turn so they scoop the fluid.
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