What problems do LML Duramax have?
Beyond emissions systems and the injection pump, the LML is the strongest Duramax engine built to date. The block, rods, and pistons on prior Duramax engines were common failure points on tuned and modified engines due to weak components. All of these items received upgrades in the LML.
Is the Duramax block used in the LMM engine?
While the Duramax block used in the LMM is a highly capable and reliable engine, it does suffer some limitations. If you are driving a stock LMM and have no intentions of modifying it, then you can ignore this issue. I’ve never heard of the pistons cracking or the crankshaft snapping on stock engines.
Are there any engine problems with the LMM?
Similar to its predecessor, the LMM has very few actual engine problems. Outside of tuned LMM’s, most problems occur with ancillary engine systems rather than major engine components themselves. The LMM is an extremely capable engine.
Why does the LMM fluid leak at the crimp?
The OEM LMM cooling lines have a fatal design flaw which causes them to leak at the crimp. At first, it is most common for fluid to only leak when it is cold outside or the engine is cold. However, initial leaks will usually turn into consistent leaks which will put you at risk of running too low on coolant.
How often does a LMM Duramax engine Regen?
The truck therefore has “regeneration cycles” which usually occur every 700 miles or as soon as the DPF accumulates 44 grams of soot. Regeneration takes approx. 40 miles of highway driving. With city driving, the exhaust usually does not get hot enough to go through a full regen process.
Are there any problems with the Duramax LMM?
One problem can rear its head when you are pushing the power of the LMM to a level GM never imagined, and that’s with the pistons. Simply put, they can crack under pressure. There are a lot of factors which dictate the power level where a piston bites the dust, but it’s usually north of 600 horsepower.
Are there any problems with my 08 LMM?
Let’s see 08 LMM of mine has been to the dealer numerous times here are some of the problems I have had.
Is the LMM engine a hot spot for failure?
Consistent to its very similar LBZ counterpart, the LMM is a highly reliable engine. The DPF is a hot-spot for failure so beware that you will probably end up with a few thousand dollars of DPF/emissions repairs, however you can *illegaly* remove this potential problem by removing the DPF system.
When did the LMM diesel engine come out?
Following the LBZ being phased out in mid-2007, the LMM Duramax took its place as Chevy & GMC’s diesel truck engine. Following the same 6.6L powerplant, the LMM was introduced due to continuously increasing diesel emissions regulations and lasted until 2010 when it was phased out for the LML.