What are the most common problems with LLY Duramax trucks?
The most notorious problem found on LLY Duramax trucks is that they have a tendency to overheat. Part of this is attributed to their inadequate cooling system, that’s made up of the smallest radiator and fan ever found on a Duramax diesel truck.
What causes a Duramax diesel truck to overheat?
Its restrictions cause excess heat and force the turbocharger to work harder than necessary. The LLY experiences more overheating compared to other generations of the Duramax diesel because of its inadequate cooling system. They have the smallest radiators and fans found on any Duramax diesel truck.
What causes head gasket to fail on LLY Duramax?
Head Gasket Failure is more common the LLY Duramax than any other Dmax generation. This is largely due to the huge factory turbocharger and overheating issues caused by a poor cooling system. There are other factors that can play a role too though. Aftermarket modifications can also cause these issues, especially at lower mileage.
What causes the LLY Duramax Turbo mouthpiece to choke?
The LLY Duramax turbo air inlet manifold, sometimes called the turbo mouthpiece, forces the turbocharger to work harder than it needs to. It does this by essentially choking the turbo because of its small, restrictive design, forcing it to work harder to produce the same amount of boost. This results in excess heat and EGTs.
What kind of water pump does a LLY Duramax use?
If you have a 2006 model LLY Duramax, this is the OEM Water Pump you will need to use. They changed designs in 2006 and the new part number is GM 12637105. Sinister Diesel’s Welded Water Pump Kit for 2001-2005 Duramax trucks feature a welded design which helps prevent impeller walk.
When did the second generation Duramax come out?
Midway through the 2004 model year, GM released the second-generation Duramax, RPO code LLY. Although much of the LLY’s internals match what you’ll find in the LB7 , this version of the 6.6L V8 brought an improved injector design, variable geometry turbocharging and cleaner emissions to the table.
The most notorious problem found on LLY Duramax trucks is that they have a tendency to overheat. Part of this is attributed to their inadequate cooling system, that’s made up of the smallest radiator and fan ever found on a Duramax diesel truck.
If you have a 2006 model LLY Duramax, this is the OEM Water Pump you will need to use. They changed designs in 2006 and the new part number is GM 12637105. Sinister Diesel’s Welded Water Pump Kit for 2001-2005 Duramax trucks feature a welded design which helps prevent impeller walk.
When to replace Duramax LLY diesel injectors?
When your 6.6L Duramax injectors start to get old and not working as well, it may be time to replace them with a fresh set of these Duramax LLY injectors for sale from the diesel injector experts at Dieselogic.
Do you need transfer case fluid for GMC Duramax?
Not true. The 1500 cases with Auto 4WD capability require the blue GM AutoTrak fluid. None of the HD’s have those transfer cases. It won’t hurt to run AutoTrak, but it calls for ATF. So if I switch to Mobil 1 for the transmission I can use the same stuff in the xfer case.