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Now I understand 6.5L cooling... thanks Heath!

Sorry to thread jack, but this issue of cooling the 6.5 TD is near and dear to me. I did the '97 cooling mods that DieselPage recommended: High volume pump, dual cross over T-Stat over 10 years ago. I was very satisfied as most of the time my coolant temp is 185. It hits 190 during flat level towing at freeway speeds. I was very satisfied with that. My remaining issue is pulling up a good grade or a mountain, then I'll see 220+ especially during the summer with high ambient temps.

According to the Heath article, there's now a better water pump than the one I have. Also some better t-stats (mine are the 180s) and fan clutch. I thought I had the goods?

I have a slight leak from my water pump I need to address. With over 100K miles on the current water pump, I think it's time to change it out. I will go with the Heath kit. What temp are the T-stats in the Heath kit?

I also need to do the timing chain and replace all hoses while I'm in there. Oh yes and clean the rads. I remember it was a fun job.

Steve
 
Factory setting AC Delcos IIRC, Bill is a proponent of the single stat with his latest pump offering, if you have a dual stat setup you add a restrictor in the bypass circuit, best to call and ask directly, but he may be in Bonneville this week also.
 
Turbine Doc said:
Factory setting AC Delcos IIRC, Bill is a proponent of the single stat with his latest pump offering, if you have a dual stat setup you add a restrictor in the bypass circuit, best to call and ask directly, but he may be in Bonneville this week also.
Click to expand...

That would be some very important info....as they're many dual stat setups running....not to mention money spent intentionaly for that particular setup.

Too bad the Balance Flow mod didn't take off......and what the comparison in balanced cooling would be between the two modifications.

You ran the BF didn't you Tim?
 
Im pretty sure they said the part Heath uses is the stock unit. They didnt say they modify it in any way. At least not in the article, just that they tested each of the units and picked the best.
 
If I were you , I would look into Kennedys fan clutch .
 
I believe I threw out the single t-stat housing when I went to the dual crossover. You know, when I did that mod the dual was reportedly the way to go.
 
buddy said:
Im pretty sure they said the part Heath uses is the stock unit. They didnt say they modify it in any way. At least not in the article, just that they tested each of the units and picked the best.
Click to expand...

My comment was about the "resrictor" TD mentioned W/ dual stat.....Maybe "mod" was the wrong word.

The "New/Heath/Delco/Oddball" (I think, stock for 2000 model year) waterpump is definatly plug and play and supposedly has a restrictor in it to help flow evenly.

With dual setup the "Mod" would be to insert a restrictor (somewhere?) to achieve the balanced flow.....Or atleast that's what I thought he was getting at, when he said to check with Mr. 6265 Racer.
 
EWC said:
If I were you , I would look into Kennedys fan clutch .
Click to expand...

Don't waste your money.....I have one and the friggin thing never disengauges......Go with a off the shelf Severe Duty Fan Clutch (If thats the route your looking to go) and if that doesn't help, you likely have other issues.
 
Brooklyn Tow said:
That would be some very important info....as they're many dual stat setups running....not to mention money spent intentionaly for that particular setup.

Too bad the Balance Flow mod didn't take off......and what the comparison in balanced cooling would be between the two modifications.

You ran the BF didn't you Tim?
Click to expand...

The original BF is still on my K1500, project engine is going to be single stat with current Heath pump offering, no modification to the pump, it is in it's stock configuration so the article is correct, but it's config is different from other stock configurations.

Best bet is to call Bill to discuss, but if you order a new "Balanced system" from him and you have a dual stat I'm reasonably certain he will set you up with the restrictor fitting with the pump, he sent me one to go in my OEM pump I just never got around to installing it, when discussing needs for my project I told him I was going to single stat it and he said "then you won't need an orificed pump" or something along those lines, but maybe I got it all wrong.

I had a rather lengthy discussion with him one day about the whole set up, basic premise is that GM went too far with GPM in 97+ & dual stat flow is too fast, and fan clutch kicks in/out too much, chasing heat vs maintaining a balanced temp, folks that buy piece meal or mix his stuff with others do not realize full potential of the balanced system, which replaced balance flow on my k1500.
 
buddy said:
Im pretty sure they said the part Heath uses is the stock unit. They didnt say they modify it in any way. At least not in the article, just that they tested each of the units and picked the best.
Click to expand...

I saw the article, and wanted to compare notes with current vs my balance flow bought before the new system came out, & called him the article according to him is mostly correct, he shared more than he probably would with most folks, but the point I wanted to get out there was that the pump & clutch sold there is different from the standard pump.
 
EWC said:
If I were you , I would look into Kennedys fan clutch .
Click to expand...


Been there done that, I did have one for a long time, it did come in as advertised, my only issue with it once engaged, it never disengaged, putting constant load on the engine when not needed, but I live in South Ms, and summers always hot. I have Heath setups on both my 6.5s now and I prefer that over the Kennedy unit, which was good but IMO the Heath was the better of the 2
 
This thread should be a sticky. Cooling comes up often.

I wonder if you need a 180 t-stat for the Kennedy clutch to unlock in hot climates? Mine would pull the gauge down and then unlock. Course I had a new condenser/radiator and 180 stat with HO pump 9blade 20" fan. AC on, WOT towing, and over 80 degrees out.
 
WarWagon said:
This thread should be a sticky. Cooling comes up often.

I wonder if you need a 180 t-stat for the Kennedy clutch to unlock in hot climates? Mine would pull the gauge down and then unlock. Course I had a new condenser/radiator and 180 stat with HO pump 9blade 20" fan. AC on, WOT towing, and over 80 degrees out.
Click to expand...

That is a possibility I was running factory stats, I have since gone to composite blade from the steel 9 blade fan, with Heath clutch & water pump unless really bearing down on it I'm always <200F H2O ,
 
You know, I don't want to jinx myself...but it was pretty hot today and I was cruisin home in the dually with a/c and it runs cool, more than any of the others I have had. Maybe I found a winner. It is a 2000. TD guilted me into pulling the coolers when cleaning. I was going to cheat...:D
BTW I saw TD's setup. It is quite impressive. It doesn't look that hard to replicate at all except we don't know what's in the mystery box...(The round cylinder that the hoses were tied into). Other than that it could easily be fabbed. Hardest part would be bringing the crossover to a good tig welder to get the bung put in.
 
Acesneights1 said:
You know, I don't want to jinx myself...but it was pretty hot today and I was cruisin home in the dually with a/c and it runs cool, more than any of the others I have had. Maybe I found a winner. It is a 2000. TD guilted me into pulling the coolers when cleaning. I was going to cheat...:D
BTW I saw TD's setup. It is quite impressive. It doesn't look that hard to replicate at all except we don't know what's in the mystery box...(The round cylinder that the hoses were tied into). Other than that it could easily be fabbed. Hardest part would be bringing the crossover to a good tig welder to get the bung put in.
Click to expand...

The mystery box is probably just an expansion chamber? What else could it be?

I wonder if you could T the upper rad hose, or just drill n tap the t-stat instead of welding the aluminum piece.
 
I DK but the Dually was low on coolant this am...:suicide:
Hopefully the system burped. It was the first drive I took it on since dissassmbley and flush. I seem to remember having to top off the Tahoe and my old 2000 a day later.
 
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