Engine/Transmission (1998.5 - 2002) need engine (second in 146000 miles)

[ThrottleJockey]

Shoot, dude, screw that gauge.....





... . get that engine back together! I'll BUY you a new set of gauges!

 

[MEREDOG]

oh , i will put a new egt gauge in, my main concern is trying to pinpoint the reason for these two "meltdowns.

All i have been able to get out of Cummins is "it got hot". I am wondering if the head could have some type defect that could cause a heating problem. this is the same head that was on the first engine.

I drive this truck on the interstae at 62 MPH , change oil every 3000-5000 miles--Run synthetics in all the gearboxes--service the transmission every 15000. Basically, i baby the hell out of it.

I also have a 03 dually . i am leaving with it Wed from Mich to wi montana idaho and washington. I hope it stays together.

 

[NVR FNSH]

You said you're pulling a 40ft gooseneck; What's your GCW? I'm guessing your pretty heavy and not really 'babying' it... .



Brian

 

[DavidTD]

So we know 2 engines melted between 70-80K miles each.



We know RV275/300 injectors. We know Edge EZ.



How much boost would it build? If the wastegate was not modified to build more than 20 psi, I agree the guage is bad. If it would build 30+, then I think maybe not.



My 98 24v runs 275's/EZ and reaches a high of 1100 in cooler month's, and has on occasion hit 1250 in real hot temps on long hard pulls. But this with a HX35, not an HY35.



Cylinders 1 and 6 head intake runners have a 90 degree bend in them (at the end of the head). We know these cylinders run hotter than 2-5 in every test we did, and others I talked to agreed they see the same thing.



Boost is air in, backpressure is air out. With the smaller 9cm housing creating more backpressure, could it be possible that running near max egt limit, with less air flow and more backpressure, these cylinders are getting too hot?



Backpressure would also explain the HG. EGT guages read the combined air temp of all 6 cylinders, unless you put in one for each cylinder, you don't know if one is hot or cold.

 

[MEREDOG]

cvw i would guess at about 20-22,000.



https://www.turbodieselregister.com/forums/attachment.php?attachmentid=57920&stc=1

 

[MEREDOG]

So we know 2 engines melted between 70-80K miles each.



We know RV275/300 injectors. We know Edge EZ.



How much boost would it build? If the wastegate was not modified to build more than 20 psi, I agree the guage is bad. If it would build 30+, then I think maybe not.



My 98 24v runs 275's/EZ and reaches a high of 1100 in cooler month's, and has on occasion hit 1250 in real hot temps on long hard pulls. But this with a HX35, not an HY35.



Cylinders 1 and 6 head intake runners have a 90 degree bend in them (at the end of the head). We know these cylinders run hotter than 2-5 in every test we did, and others I talked to agreed they see the same thing.



Boost is air in, backpressure is air out. With the smaller 9cm housing creating more backpressure, could it be possible that running near max egt limit, with less air flow and more backpressure, these cylinders are getting too hot?



Backpressure would also explain the HG. EGT guages read the combined air temp of all 6 cylinders, unless you put in one for each cylinder, you don't know if one is hot or cold.

Hi David

this has the stock turbo with a spring deal that ATS put on that ,the way i understood ,holds the wastegate shut longer and allows a little more boost. Pulling hard it would reach 26-28 pounds.

So if i am understanding you correctly , you are suggesting a larger turbo ?

I know Jeff suggested a sledpuller to Todd when he replaced the injector pump for us.

I am not mecanically inclinded so am seeking info to prevent this happening again.

Leaving Wed for the west coast with a trailer load of carriages with my 03, hope i don't run into problems with it.

 

[DavidTD]

Hi David

this has the stock turbo with a spring deal that ATS put on that ,the way i understood ,holds the wastegate shut longer and allows a little more boost. Pulling hard it would reach 26-28 pounds.

So if i am understanding you correctly , you are suggesting a larger turbo ?

I know Jeff suggested a sledpuller to Todd when he replaced the injector pump for us.

I am not mecanically inclinded so am seeking info to prevent this happening again.

Leaving Wed for the west coast with a trailer load of carriages with my 03, hope i don't run into problems with it.

I think you are doing the right thing looking for "why". It has me wondering in a big way because aside from the turbo difference, we have the same mods, run nearly the same temps etc. and mine's done it for 225k miles.



I am hoping someone with some first hand experience may be able to answer my question in hopes we can eliminate or include that theory.



The only other thing I would have to consider is injectors. It may be that one is out of spec and running that cylinder hot. This could have been in #6 hole fist motor, and when put back together, put in #1.



I combine on the scales at 22,060 lbs. I DO believe something is wrong, maybe everyone can figure out where so it won't happen again.

 

[MEREDOG]

I think you are doing the right thing looking for "why". It has me wondering in a big way because aside from the turbo difference, we have the same mods, run nearly the same temps etc. and mine's done it for 225k miles.



I am hoping someone with some first hand experience may be able to answer my question in hopes we can eliminate or include that theory.



The only other thing I would have to consider is injectors. It may be that one is out of spec and running that cylinder hot. This could have been in #6 hole fist motor, and when put back together, put in #1.



I combine on the scales at 22,060 lbs. I DO believe something is wrong, maybe everyone can figure out where so it won't happen again.

Todd (my son) said he understood Jeff to say that towing the way we do that a sledpuller is the next mod we should go for --that it would bring the egt's down. Did he understand him correctly?

The injecter thinking makes sense. i will be sure to mention it to Cummins---surely they should have a way to check injectors? that was their first diagnosis when we first took the truck in was a defective injector in the number one cylinder that was causing our "miss--lack of power", they later said piston after removing the head.

In fact I ordered and had two Bosh 300's shipped to them . Figured i would get a spare just in case.

 

[therabbittree]

man I can't imagine your engine will cost that much for some one to rebuild ie bigger pistons, firering, and rebuild. I assume your head and your crank are fine. . basically be buying a bore job $500, fire ring job with headgasket and parts $600, pistons & rings $800, Bearings $250, and cam $700. Thats $2850 say $3500 to cover incidental stuff..... and a remove rebuilt and install say $1500 at most . . Total about $5000 . . then heck do a ats manifold and a bigger turbo with the extra $ to get at the $6500 cummins quote and way stouter engine. If you can assemble it your self and remove and install it will be even better. Heck you could trailer the truck on your 03 and gooseneck to a vendor from this site some where around you and have them do the work for you.

I hope it works out for you, keep us informed.

thanks

Deo

 

[DavidTD]

Todd (my son) said he understood Jeff to say that towing the way we do that a sledpuller is the next mod we should go for --that it would bring the egt's down. Did he understand him correctly?

The injecter thinking makes sense. i will be sure to mention it to Cummins---surely they should have a way to check injectors? that was their first diagnosis when we first took the truck in was a defective injector in the number one cylinder that was causing our "miss--lack of power", they later said piston after removing the head.

In fact I ordered and had two Bosh 300's shipped to them . Figured i would get a spare just in case.

The HT Turbo's are nice, you'd probably do best with one of the smaller ones since you are towing and not looking for big HP. But, I think an HX35 should be "enough" turbo with your mods. Just not sure about the HY.

 

[MEREDOG]

The HT Turbo's are nice, you'd probably do best with one of the smaller ones since you are towing and not looking for big HP. But, I think an HX35 should be "enough" turbo with your mods. Just not sure about the HY.

what is the big difference between the two ? i looked at the charts here but it is goobally gook to me



http://dodgeram.org/tech/dsl/FAQ/turbo_faq.htm

 

[DavidTD]

what is the big difference between the two ? i looked at the charts here but it is goobally gook to me



http://dodgeram.org/tech/dsl/FAQ/turbo_faq.htm

Turbine housing.

 

[MEREDOG]

Scary. I spoke to the tech at cummins about upgrading the turbo and he says it is not necesary, says the stock turbo should do the job.

think i will upgrade to something larger when i get it back

Leaving in the morning for the west coast with the 03'. Built a wind deflecter on the gooseneck today, hoping that will let it pull a bit easier



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[jwilliams3]

You should have asked that Cummins "tech" if he drove a Cummins :-laf

 

[MEREDOG]

Actually, he has a 2003 with 278,000 miles on it and swears he has never laid a wrench on it. :--)

 

[SAndreasen]

i usuaslly pull a gvw of 28,000 to 29,000 pounds we have some hills that are over 6. 5 % and i can keep my 01 mashed all the way and never run a pyro over 1400 degrees

 

[PRout]

1400 is too hot.