LLY and LBZ

[davidbt]

Been reading a lot of posts, still trying to figure out the difference's between the two engines. I have an 04 2500 D/M LT with 99,600 miles. Bought the truck when it had only 73,000 miles on it.

[jaycocamprs]

davidbt wrote:
I've been looking at an 05 dually. Are there after market radiators available?

Yes mine came from what is now Cooler Towing Dot Com. I bought the auxiliary radiator and lower mounting bracket from Joe, then bought the other parts local. Works well for us.

[davidbt]

I was looking at a 05 crew cab 3500 dually on line. It has 179,000 miles. Looks like a very clean truck. Asking price of just over $18K

[lazydays]

In three years mine has never overheated and I've pulled in temps close to 100. I guess it's the luck of the draw.

[ib516]

davidbt wrote:
I've been looking at an 05 dually. Are there after market radiators available?

Lots of reading on the LLY overheat causes and cures.

There are supplemental radiators and oil coolers available, along with inmproved air intake systems that all have some percentages of success.

I also read this article about the differences in the February 2009 issue of DIESEL WORLD magazine. Here's a forum post about it on one of the Duramax forums:

The newest issue of Diesel World magazine, February 2009 issue, contains an article entitled "Project TowMax - Turning a 2005 Duramax Into a Towing Monster".

If you own an LLY, you'll want to pick up a copy.

The thrust of the article focuses on the radiator, fan and fan shroud, and upgrading to factory 2006-2007 LBZ components, showing what's involved in installing the parts. The LBZ uses a larger radiator, larger fan and larger fan shroud. In addition, you'll need the LBZ fan clutch, which is also larger and able to handle the larger fan. There are a few other items discussed that are required to install the larger parts.

According to the article, the LLY used a 19" fan, where the LBZ used one with a 23" diameter. The LBZ radiator grew by an additional 4" in height and 7/8" in thickness."

[Me_Again]

davidbt wrote:
for Me Again, with more research, I have found that the injectors and the glow plugs have been replaced under warranty. Thanks

Yes! But depending when that was none you might be doing it again. I had a friend in Arizona that got warranty injectors and a few years later they got low pressure dribble and GM said not the same problem sorry. I hope that you do not have that experience. His DW was in tears spending 4500 for another set.

Chris

[jbadtoy]

Some people had overheating issues but most of the trucks 04-06 never did. Any truck will run hot if you set the cruise control at 70 up a grade in 100+ weather.

[davidbt]

I've been looking at an 05 dually. Are there after market radiators available?

[jaycocamprs]

Turtle n Peeps wrote:

jaycocamprs wrote:
The detuned LBZ engine in a 05-body truck will still overheat. It's not the engine that’s the issue, it's the smaller radiator in the 04/05 trucks.

The LLY in an 05 truck is not a detuned LBZ. Second gen LLY's ONLY came in 06 trucks.

Perhaps I should have said a LBZ (detuned or not) would still over heat in a 05 body truck. It wasn’t the changes to the motor that stopped the overheating. It was the 30% larger radiators in the 06/07 trucks.

[davidbt]

for Me Again, with more research, I have found that the injectors and the glow plugs have been replaced under warranty. Thanks

[Lowsuv]

I am pretty sure that a 2002 duramax if purchased new will not need the injectors replaced a dozen years later .
I am also very sure that a 2002 duramax purchased new will not overheat in the desert California 115 degree heat towing a high profile travel trailer for a dozen years or so .
Air conditioner going full blast driving 61.23 mph towing and neither temp guage in the red , 115.67 degrees uphill into a headwind .
No worries , mate ...

[christopherglen]

Here is a writeup of the duramax's..
wikipedia

[Me_Again]

davidbt wrote:
Thanks everyone. going by my Vin. I have a LB7

So you only have to worry about your injectors and the 4500 to change them. Chris

[Turtle_n_Peeps]

jaycocamprs wrote:

CKNEK wrote:
The confusing part is GM produced two versions of the LLY 04.5 to 05 were the early versions that some people had overheating problems. The 06 late version LLY was basically a detuned LBZ with none of the overheating problems. The early LLYs had the 5 speed trans and the late LLYs had the 6 speed trans with the +/- on the shifter column.

The detuned LBZ engine in a 05-body truck will still overheat. It's not the engine that’s the issue, it's the smaller radiator in the 04/05 trucks.

The LLY in an 05 truck is not a detuned LBZ. Second gen LLY's ONLY came in 06 trucks.

[jaycocamprs]

CKNEK wrote:
The confusing part is GM produced two versions of the LLY 04.5 to 05 were the early versions that some people had overheating problems. The 06 late version LLY was basically a detuned LBZ with none of the overheating problems. The early LLYs had the 5 speed trans and the late LLYs had the 6 speed trans with the +/- on the shifter column.

The detuned LBZ engine in a 05-body truck will still overheat. It's not the engine that’s the issue, it's the smaller radiator in the 04/05 trucks.