6.4 NOT Getting up to Temp?

[Low_Sky]

Wow that is interesting. That is called a Wax Motor. They are used heavily in industry in HVAC and are considered extremely reliable in that setting. Maybe a big part of why they fail is that the coolant has so much more energy flowing past the wax that the heating element really has to dump heat into it to get it to work properly. Too much heat, too fast for that kind of motor. They usually have very little power and move slowly.

No first hand experience with wax motors, but I’ve heard you can get pretty high force out of them (albeit slowly). YouTuber AvE did a video with one and it was pretty interesting.


Sent from my iPhone using Tapatalk

[NickTF]

I've always wondered why my truck will go from a normal temp of 205-212 or so down to 195 in a hurry if I mash the skinny pedal. That's why I've always suspected some kind of electrical control. If these wax motors react slowly i'm guessing it takes very little movement to change coolant flow with the 6.4 cooling system.

[olyelr]

I've always wondered why my truck will go from a normal temp of 205-212 or so down to 195 in a hurry if I mash the skinny pedal. That's why I've always suspected some kind of electrical control. If these wax motors react slowly i'm guessing it takes very little movement to change coolant flow with the 6.4 cooling system.

This! I have noticed that too, with not only the engine temp but the trans temp. They have something like that for the trans too?!

[RustyPW]

Here’s an article on this new style of T-stat.

I haven’t seen one yet but the Euro guys I work with say they fail all the time.

[NickTF]

I've always wondered why my truck will go from a normal temp of 205-212 or so down to 195 in a hurry if I mash the skinny pedal. That's why I've always suspected some kind of electrical control. If these wax motors react slowly i'm guessing it takes very little movement to change coolant flow with the 6.4 cooling system.

This! I have noticed that too, with not only the engine temp but the trans temp. They have something like that for the trans too?!

My 97 had a heat exchanger which had engine coolant share temps with trans fluid in order to help heat the trans up quicker. When I fabbed up compound turbo piping I had to relocate it to the frame (mounted on passenger side where big bottom turbo goes on 12v cummins). Possible the 6.4 has a similar heat exchanger setup or possible the trans cooler feels effects of cooler rush of coolant running through radiator, all guesses without having looked in detail how things are plummed. I can't say i've seen my trans temp decrease rapidly at load as I don't pay much attention to it seeing how it is nearly always at 170 no matter what if i've driven for a bit.

[DamageWagon]

The 6.4 does have a coolant/oil heat exchanger but that is only for the engine oil. Dropping rams temps from higher throttle are likely due to higher oil flow and the cooled oil from the trans cooler rushing in.

[olyelr]

Yea i wouldnt say rapidly. But I have noticed under a large high speed hill climb while towing our tt under heavy throttle that the temps in the trans actually lowered from something like 172 to 168. I thought it was odd because I just figured it would go UP at least a few degree’s if not more, but not down.

[Reloaderguy]

The 6.4 does have a coolant/oil heat exchanger but that is only for the engine oil. Dropping rams temps from higher throttle are likely due to higher oil flow and the cooled oil from the trans cooler rushing in.

Nick doesn't have a problem with high oil flow.

[olyelr]

The 6.4 does have a coolant/oil heat exchanger but that is only for the engine oil. Dropping rams temps from higher throttle are likely due to higher oil flow and the cooled oil from the trans cooler rushing in.

Nick doesn't have a problem with high oil flow.

That might have been geared towards my comment about my trans cooling down under wot too.

[RustyPW]

I'm loving my 3G more and more.

[Mule007]

X2 !!

[olyelr]

Have any specific questions on the EGR? It's a relatively easy swap but it didn't solve a thing for me.

Rough cost for parts? I was mainly wondering if it cured any of your issues. I want this relatively minor chugging and bucking to go away... its driving me infawkingsane.

[olyelr]

I'm loving my 3G more and more.

X2 !!

Oh bless your souls. You guys know that half of the 3rd gen issues add up to twice as much as all of the 4th gen issues.

[RustyPW]

I'm loving my 3G more and more.

X2 !!

Oh bless your souls. You guys know that half of the 3rd gen issues add up to twice as much as all of the 4th gen issues.

Issues? What issues? Besides the voices in my head.

84,000 trouble free miles. The only things that needed fixed was the clock spring in the steering wheel, idle pulleys on the belt, and the exhaust manifold studs which all Hemi;s have problems with.

[DamageWagon]

The 6.4 does have a coolant/oil heat exchanger but that is only for the engine oil. Dropping rams temps from higher throttle are likely due to higher oil flow and the cooled oil from the trans cooler rushing in.

Nick doesn't have a problem with high oil flow.

That was in response to Olyelr.

Oil temp tends to follow coolant temp, not so much the other way round.

[NickTF]

Have any specific questions on the EGR? It's a relatively easy swap but it didn't solve a thing for me.

Rough cost for parts? I was mainly wondering if it cured any of your issues. I want this relatively minor chugging and bucking to go away... its driving me infawkingsane.

Close to $100 if I remember right. Didn’t cure any or the surge issues just think it’s the nature of this power train. Some may be more sensitive to it than others who knows

[Mule007]

Issues? Tension pulley, exhaust manifold studs, water pump, broken rear taillight, front ball joints, religious maintenance !!! Great truck!