crucescrawler

It is pulling air. But it does not sound like a freight train... Should it?

Edit: Although it does at higher rpm.

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1998 2500 Cummins Quad Cab 4X4, 12 Valve, KDP fixed, AFE Stage II, 1998 dodge Laramie SLT 3.55 gears, BD Automatic 3 disk lockup,Triple pillar guages-Auto Meter Pro Comp ultra lite Trans, Pyro, Boost, HX35, Bosch 7100 turned up w/#8 BD plate, 100hp bosch injectors, 3,000 rpm spring kit, PSC Steering, 05' wheels, 33''x12.50''-17 Big O X/T's, Leveling Kit, 5'' Exhaust, Gooseneck

RickCJ

Normal driving you won't hear it but once it gets hot it will tighten up and sound like a jet under your hood till the temps drop, if you don't hear it, it isn't working! Its not the same sound if you rev the engine in nuetral. You need to verify the fan clutch is working before you waste time any where else.

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Rick


99 Dodge CTD 3500 4x4
5-speed with 3.55's
13" SBC CON O
SHOVP44
FASS
ISSPRO
Edge Comp
DDII's
BD E-brake
BFG A/T KO's

crucescrawler

Okay, another new cummins fan clutch on the way. Lets try it again. Holding my breath this is what it is.

GAmes

That is my point. The intercooler is in front of your radiator. When you push that high boost compressed air through it the air that exits to the radiator is already super heated. Try climbing the same hill at a lower speed, in a lower gear and not exceed 20 pounds of boost. That, along with a fan clutch that works, will probably solve your problem.

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97 3500, G56 6 speed, lightly bombed 725+k miles
(GETTING CLOSE TO 3/4 MILLION MILES!!)

crucescrawler

I know its been a while... Working on 2 months... But I replaced the existing good fan clutch with a new cummins fan clutch, and nada. same problem. Still gets hot with a load.

Pulling at a lower speed? A lower speed is not the cure. Honestly I am not trying to hammer this thing up the hills with everything its got. I am trying to pull a hill at a normal towing speed with a normal load and normal temperatures. A lower speed would probably put me about 20 mph to keep everything cool where similar trucks and loads can pull 60-65 all day long.

crucescrawler

Do I give up on my baby?????????

I just had the crank and cam ensured that they are correctly meshing. I thought maybe the cam was off a tooth?

Not a problem. Everything checked out okay.....

crucescrawler

Ideas?

G1625S

Just reading this for the first time. Still running the hx35? timing is verified? more timing will actually lower egt's, but raise coolant temps. Closer to stock timing will increase boost and actually lower coolant temp due to more of the heat energy going out the exhaust, leaving less heat for the rad. to deal with. As for the fan you should be hearing it once temps get to 195 or so. It is unmistakeable. When I break 205 towing, it comes on like a freight train untill temps drop to 180. On long grades, it wil stay on for the duration of the hill. If the temps crawl over 205, I back out, but not like you have to...my experience is GCVW of about 22000.

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'96 2500 club cab 4x4 5 speed
2'' leveled
autometer boost/pyro
215 pump, timed at 16.5*
zero-ish plate, 4kgsk
South Bend 3250 street DD clutch
Yokahama Geolanders, 315 70 17's on H2 satin wheels
12.5k Warn winch
lots of rust, lol!

Formerly: '89 w350 5-speed.
Mods-3rd gen IC, HTT III

RickCJ

I see you tried a couple fans but you never did say if you can hear it kick on.
If you can't hear it roaring like a jet/freighttrian etc... it isn't working.

crucescrawler

I think I am going to adapt the fan to a solid mount and delete the clutch to quadruple verify that the fan is working... Possibly three bad fan clutches from cummins??? Could it really happen?

1320

I have your same problem. I suspect mine is radiator though. I killed my oem BRASS radiator. The replacement is a thinner core aluminum with plastic tanks. Well aluminum dosnt transfer heat as well as brass, its thinner (less surface area) and the tanks dont disipate heat like the brass either. I could have crippled the cooling capacy of the radiator by 25% I figure. Anyways, I still have the brass (damaged) radiator, that Im now gonna get recored and swap back before my next heavy pull.

I have plenty of power, but the hills, it slowly builds heat until I have to slow down. It sucks. I cgvw at about 27k-30k...

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98 12 valve,Twin turbo& triple intercooled, hx 40 (16 cm )/ht3b(26cm) 4x4,quad cab,DRW,NV5600 conversion,velvet ride shackles,KDP fixed,.020 over marines, ported head, helix 2 cam, lots of coatings, quick spool valves, ats ported and coated manifold, total seal rings,DDP4's,4000gsk, 5 dp to 4 inch home made exhaust with us gear exhuast brake, bhaf, alcoas,gauges.60 lb valve springs, southbend, magtec.