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Tool Talk Discussion Forum

O/T Pyrometer

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Dan in Ore

06-25-2006 03:35:41




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I have an '06' Dodge with a Cummins in it. I had someone install a pyrometer. When they installed it they drilled and tapped the manifold on top between #3 and #4 cylinders.

Yesterday, I had a modest load on (about 900# of sod) pulling about a 6% grade and the pyrometer nearly pegged out at 1600 degrees.

I'm wondering if the pyrometer shouldn't be closer to the turbo, which would give me a lower (and I believe more accurate) reading.

Thank you.

Dan

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Dan in Ore

06-27-2006 04:33:17




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 Re: O/T Pyrometer in reply to Dan in Ore, 06-25-2006 03:35:41  
I have included a link to the meter mfg website. They say the same thing the Dodge dealer says. It also says in the install instructions not to lengthen or shorten the wire as it is calibrated. I distinctly remember the installer shortening the wire so he wouldn't have a lot of excess to deal with. Am trying to get a new wiring harness so I can install the meter.
I also sent an e-mail to Cummins tech support and asked them where the probe should be and what the maximum temp is at that point.
I apprecitate the advice you guys have given me and regardless the outcome, I will always value it if I have future need.

Dan

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Tim Casbolt

06-26-2006 17:18:38




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 Re: O/T Pyrometer in reply to Dan in Ore, 06-25-2006 03:35:41  
I'm willing to bet there's nothing wrong with your truck. 99.9% sure it's a gage or installation problem.



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Dan in Ore

06-26-2006 08:36:54




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 Re: O/T Pyrometer (and the dealer said) in reply to Dan in Ore, 06-25-2006 03:35:41  
I talked to the local dealer this AM and he told me to put it downstream of the turbo. Keep it below 1200 there. I think I will go with that information since they are the ones that will do a warranty claim if there is one.

I'm also going to get a new pyrometer and install it. Don't know if I can trust this one or not.

Thanks for the advice and the help.

Dan



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the tractor vet

06-26-2006 09:14:16




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 Re: O/T Pyrometer (and the dealer said) in reply to Dan in Ore, 06-26-2006 08:36:54  
Well you can take this or leave this advice , (1) the probe instaled before the charger in the maifold EGT should not exceed 1250 degrees and if ya doubt my word then call CUmmins TECH SUPPORT . (2) if ya install it behind the charger then if it reaches over 950 it is melt down time .(3) your dearler service manager does not know his arss hole form a door knob. and lately i have run into a bunch of them along with the so call tech's . So here is just what to do , don't go to the DODGE DEALER TAKE IT TO THE REGULAR CUMMINS SHOP AND HAVE THEM LOOK AT IT as if nothing has been done to it to tweek it then there is SOMETHING TOTALY WRONG as if it was wright i doubt that it would even make 900 degrees on the hot side . PLAIN AND SIMPLE.

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TimWafer

06-26-2006 10:01:00




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 Re: O/T Pyrometer (and the dealer said) in reply to the tractor vet, 06-26-2006 09:14:16  
I agree totally with the tractor vet. 1200 beyond the turbo is also WAY too hot. If this is a totally stock truck something is wrong somewhere. Either the pyro is faulty or there is some other problem. Call Cummins as he advises. The local Dodge dealer typically won�t know squat about diesels. I�m not claiming to be an expert either but have seen guys destroy their engines at temps well below 1600 at the manifold for any length of time. It�s your truck, so do as you please but you can�t say you weren�t warned.
Tim

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the tractor vet

06-26-2006 09:12:39




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 Re: O/T Pyrometer (and the dealer said) in reply to Dan in Ore, 06-26-2006 08:36:54  
Well you can take this or leave this advice , (1) the probe instaleed before the charger in the maifold EGT should not exceed 1250 degrees and if ya doubt my word then call CUmmins TECH SUPPORT . (2) if ya install it behind the charger then if it reaches over 950 it is melt down time .(3) your dearler service manager does not know his arss hole form a door knob. and lately i have run into a bunch of them along with the so call tech's . So here is just what to do , don't go to the DODGE DEALER TAKE IT TO THE REGULAR CUMMINS SHOP AND HAVE THEM LOOK AT IT as if nothing has been donme to it to tweek it then there is SOMETHING TOTALY WRONG as if it was wright i doubt that it would even make 900 degrees on the hot side . PLAIN AND SIMPLE.

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JD9295

06-26-2006 04:11:55




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 Re: O/T Pyrometer in reply to Dan in Ore, 06-25-2006 03:35:41  
The pyro should be on the exhaust side of the turbo. Its in the wrong place. The exhaust will run that hot right at the cylinder in the manifold. I have a 94 that we use on the farm that is tuned about as high as the rest of the truck can take and haul some BIG loads with it. We have had the exhaust real close to being slag.
Take it to a diesel shop, someone that knows whats going on and they will show you and put it in right.

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TimWafer

06-26-2006 08:06:06




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 Re: O/T Pyrometer in reply to JD9295, 06-26-2006 04:11:55  
I would have to disagree with that. Certainly you can put the pyro farther away down the line or even after the turbo and get a lower temperature. But then it is not giving you an accurate reading of the crucial temperature. Running with manifold temps that high is just insane. If the truck is stock then I would tend to agree that the pyro is faulty or mismatched parts. From all the Dodge Cummins owners I have talked to however, my opinion is that the pyro is located in the preferred location.
Tim

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buickanddeere

06-26-2006 22:03:55




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 Re: O/T Pyrometer in reply to TimWafer, 06-26-2006 08:06:06  
True. The critical temps are those of the exhaust passing over the exhaust valves and through the turbine blades. Downstream of there? Who cares.



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Richard Fazio

06-25-2006 12:53:09




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 Re: O/T Pyrometer in reply to Dan in Ore, 06-25-2006 03:35:41  
Dan, Have you done any mods to the engine? Chips or programmers as well as mechanical mods will up your temps. I don't think a stock engine could get that high.



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Dan in Ore

06-26-2006 03:24:28




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 Re: O/T Pyrometer in reply to Richard Fazio, 06-25-2006 12:53:09  
No modifications. I have thought about "chipping" it, but haven't needed to yet. As far as the parts matching, I watched them take the gauge and thermocouple out of the same box, so I am pretty sure they match.

Guess I just need to back out of it on the long pulls. Never had a diesel before and the manual really doesn't say much.

Thanks for the help guys. This forum can be extremely helpful.

Dan

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the tractor vet

06-25-2006 07:59:25




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 Re: O/T Pyrometer in reply to Dan in Ore, 06-25-2006 03:35:41  
Ya had better get a bigger charger on it add a water injection system or can we say CHINA SYNDROME . You will either melt your pistons down or sezze the engine or melt the fins out of the charger . Myself i would be doing some checking and make sure that all hoses from the charger to the air to air are not leaking and from the air to air to the intake are tight and not leaking and if this is found to be good the back down the fuel . Now if ya don't then better stock up the check book as this one will cost ya BIG TIME as Cummins won't foot that bill.

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buickanddeere

06-25-2006 07:03:37




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 Re: O/T Pyrometer in reply to Dan in Ore, 06-25-2006 03:35:41  
Does the thermocouple match the indicator unit? Has somebody mixed and matched parts?



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Tim Wafer

06-25-2006 06:24:17




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 MELT DOWN!! in reply to Dan in Ore, 06-25-2006 03:35:41  
The pyro is located correctly. 1600 is way too hot! You are destroying your engine at that temp. I assume some mods have been done to reach that temp. I have no doubt that it can reach that high but rest assured it wont live long at that degree. I try to keep mine at 1200 and below. I have a straight 4� exhaust and a BHAF. Still, I�m sure I could easily reach 1600 even empty on a steep long grade if I pushed it, but I don�t. That�s why you watch the gauge. They say you can go 1250 or so safely but 1600 is WAY too much! Back off or you�ll melt it.

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J.C.H.

06-25-2006 06:05:22




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 Re: O/T Pyrometer in reply to Dan in Ore, 06-25-2006 03:35:41  
1600' at 3&4 !! Better drop into a lower gear and speed that motor up.1600' may be the normal exh. temp. but sure sounds hot to me.Least ways it was on our Cummins 335.



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