Double Teamed! More bulletins followed which, again, again promoted the availability of the pre-filter kit and emphasizing the importance of adhering to fuel filter maintenance intervals.
Sure enough, the fuel filter stood at the center of the storm. Two things that I mentioned earlier now come into play. The first is that water is not the only contaminant found in the fuel you and I buy at the pump — even if it is the primary culprit when it comes to actually damaging the injectors.
Asphalt is a heavy fraction that we all know and love as the substance used to hold aggregate together on roads and such. However, some asphaltenes are always undesirably present in diesel fuel. Back to the fuel filter. During normal operation, the pores in the media of the Duramax fuel filter become clogged with the omnipresent asphaltenes. As more pores become clogged, the fuel has less and usable media through which to flow.
Restricted flow increases fuel flow velocity. Now remember that the Duramax fuel filter doubles as the water separator. Normally, the tiny particles of dissolved water present in the fuel are too large to pass through the filter.
They coalesce on the surface of the filter and run down to the bottom of the can where the water-in-fuel sensor resides. However, if the asphaltenes have plugged enough of the pores in the filter, resulting in a higher fuel flow velocity across the filter, those same water particles can stick to the filter media.
If they stay there long enough, the filter media swell creating, one by one, larger pores that will now allow the water particles — we could call them injector assassins now — to pass through. What happens next? You guessed it: fuel injector homicide! Importance of Maintenance. Looking at the photos below of the fuel filters that have reached or exceeded the maintenance interval, it should be obvious why replacing the fuel filter consistently before too much asphaltene restriction occurs is imperative.
If the OEM fuel filter had been doing everything it should have been doing prior to being neutralized by the asphaltenes — something that should not occur if a fresh filter has been installed at the proper service interval — this would have been the end of the story. Messages 12, Reaction score Location Slidell, La. Thats the stuff. If anything will clean them without tear down, it will. I'm not having any sign of touble but I don't see how it could hurt. Maybe it'll help clear up my sticky turbo vanes a bit more.
Changing to synthetic oil took care of most of the codes for those though. Got a jug on order. I won't put it in until I know I'm going to make a good run over 50 miles at 60 mph plus. View attachment Is This the right cleaner or is there a specific one for diesel?
That stuff sounds similar to the liqui-moly diesel purge. It would be smart to drain the fuel filter or ruin a new one. The Stuff has lots of alcohol in it to get water out of the system and IMO is the reason to only use it at idle. Let alone not getting a slug of water from the tank past the separator. MrMarty51 Well-Known Member. Been looking up methods for flushing.
I initially wasn't aware of the sequence. It'll not be until spring. I think I will be sucking the tank dry and dumping it straight into the old detroit diesel powered 76 Chevy 90 grain truck. To a 2 cycle detroit all our garbage diesel goes. I will be tracking down a used fuel filter housing anyone got one? As far as air, while the primer did pump soft like there was air, this thing has never really responded like it has air in it. It runs very smooth. Overheating issues typically occur because of a faulty water pump, or a damaged fan clutch.
When the fan clutch is damaged, it prevents it from operating and giving the LB7 Duramax engine the additional cooling it needs. Overheating can also be attributed to a dirty or clogged radiator. Over time, your radiator can accumulate dirt, grime, and other gunk. To make things worse, the factory radiator is a little small. This means a smaller surface area and even less overall cooling capacity.
First, you want to identify what is causing overheating on your LB7 Duramax. You can definitely start by making sure your radiator is free and clear or debris, dirt or other gunk. Check for a bad thermostat or water pump. Try to find out under what conditions the overheating occurs. If your truck is only overheating under extremely heavy loads, that is generally more normal. If your truck is overheating anytime you drive it, you definitely have a problem that needs to be taken care of as soon as possible.
Here are the parts we would use to fix our own LB7 Duramax. Performance Radiators like this one from Mishimoto often produce better cooling than factory units. Check it out here. The LB7 Duramax is more prone to head gasket failures than future generations of the Duramax engine. LB7 Duramax head gasket problems can occur for a couple of reasons. Overheating can sometimes be attributed to head gasket failure, as the LB7 Duramax does suffer from a small radiator, fan, and problematic water pumps.
Head gasket failure can also be attributed to performance modifications like tuning that allow the head bolts to stretch and a lifted cylinder head. More LB7 head gasket failures are attributed to the poorly designed head gasket found on these trucks. The LB7 Duramax has a layered steel head gasket. During the compression stroke, the head can lift a little. This in turn, can result in gaps in the steel head gasket. The layered gasket will then leak. Leaks can occur internally or externally.
Internal leaks result in coolant reaching the cylinders, while external leaks result in coolant loss. Unfortunately, this can be pretty complex and require a skilled mechanic.
Even for a skilled mechanic it takes over 10 hours to do everything right. ARP head studs are second to none and provide vastly better clamping force than the stock head bolts. GM has since updated their head gaskets to be more durable, so it is possible to use a new OEM gasket. Merchant Automotive makes a complete head gasket kit that is of better quality. If you want to make your LB7 Duramax more durable than the factory design, this is the route you should go.
These studs offer the best clamping force and drastically better performance than comparable studs from other manufacturers. The Allison Transmission is well-known by diesel enthusiasts for being one of the most reliable transmissions ever. In fact, when you tune your LB7 Duramax or add other performance modifications, the Allison transmission can enter limp mode. LB7 injectors using Bosch common rail technology operate at very high pressure.
Poor quality fuel will cause premature injector failure. The process changes from model year to model year and is complex enough that we recommend purchasing a service manual if you are attempting this job yourself. The LB7 Duramax built from — The good news is the replacement injectors you purchase from us incorporate several updates to help prevent repeat failures.
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