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Dennis
Dodge Dakota
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8/07/2005
11:30:15
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 Subject: RE: Damn thing keeps over-heating!!!
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Does anyone make a 160-180 thermostat for a 4.7L V-8 2000 Dakota Quad Cab?
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Rob C
Dodge Dakota
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8/08/2005
02:34:55
|  RE: Damn thing keeps over-heating!!!
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No, you won't find it listed anywhere but, the small diameter (2-1/8") thermostat for Mopar V8's will fit the 4.7L V8. I recommend the Mr. Gasket 4364 (about $9), it's a hi-flow, RobertShaw style. However, the 4.7 utilizies a special thermostat button extention on it that closes off the waterpump bypass 50% when the engine heats up. An after market T-stat won't have this and therefore aren't as efficient at cooling the engine because the coolant always has maximum bypass flow. I just put a 4364 in a couple weeks ago and the engine is only running at about 205 but, it's staying consistent and not spiking up to 240 like the old Stant 180* I'd installed last year. You might consider using some JB weld to glue some kind of restictor into the bypass port behind the T-stat when you replace yours that's what I'd like to do when I get a chance. BTW, I wouldn't recommend totally blocking the bypass unless you live somewhere that never really gets cold like Phoenix or Death Vally.
Has anyone done this to their bypass port?
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NEW_SOL
Dodge Dakota
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8/08/2005
11:02:42
| RE: Damn thing keeps over-heating!!!
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That explaines my problem when pulling constant high hills. now does the mr gasket #4364 have that extension on the t-stat?
thx
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GraphiteDak
GenIII
8/09/2005
00:31:38
| RE: Damn thing keeps over-heating!!!
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Hey RobC. First time I've heard what the extension was for! I thought it was just more efficient at sensing the temp LOL!
I never looked into the housing to see it is blocking something as it opened!
I live in Phoenix. But drive it in the snow every winter time too. NEED the heater when it comes to snow time! After we romp the ATV's in the snow. We need a HOT truck to come back to.
But furthest thing to worry about right now. It's close to 110 degrees here in Phoenix.
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Rob C
Dodge Dakota
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8/10/2005
13:08:56
| RE: Damn thing keeps over-heating!!!
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No, the RobertShaw style hi-flow thermostats are not designed for the 4.7 engine. As a matter of fact I don't think anyone makes an aftermarket thermostat with the extension on it, even the ones that list it. The fact is, quite a few thermostats with fit on the 4.7 after you modify them by filing a notch for the reuseable gasket. The gasket has a small bump that fits into a notch on the standard thermostat and a tab that fits into a recess on the thermostat housing. When you file the notch in the thermostat, do it so that when the thermostat w/gasket is put into the housing the small bleed hole in the thermostat is near the top of the thermostat for optimum bleeding (since air bubble tend to float up not down).
I like the RobertShaw style because a larger area opens up and it's design resists failing shut. Here's link that shows the thermostat type:
http://www.cooperstandard.com/us/en/Aftermarket/Aftermarket_Products_Thermostat.asp#Extra
I'm either going to JB Weld a restrictor into the bypass port or modify my stock thermostat to open sooner. My theory is, the stock thermostat has an extra heavy-duty spring to keep it closed. If I cut a winding off to relieve some tension, it may just open sooner.
If anyone has tried this before, please comment on your experience.
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