Do LB7 Duramax have head gasket problems?
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Do LB7 Duramax have head gasket problems?
So, blown head gaskets were a bit of a surprise to the owner, but it just goes to show that their failure can happen in any LB7, regardless of mileage, use, and/or abuse.
What are common problems with the LB7 Duramax?
The 5 Most Common LB7 Duramax Engine Problems
- Fuel Injector Failure.
- Water Pump Failure.
- Fuel Filter Housing O-ring Leaks.
- Blown Head Gasket.
- Overheating (fan clutch problems, radiator gunk)
What causes fuel in oil LB7?
Most likely, either its one of the injectors, or one of the the return lines didn’t seal. They need to put some dye in the fuel, run it for a bit and pull the valve covers and see if any dye has made its way into the valve covers.
What is normal oil pressure for LB7 Duramax?
Registered. Normal. It should get up closer to 80 on hard excelleration. If it drops significantly below 30, that would be a problem.
How do you tell if my Duramax has a blown head gasket?
A simple test is to put the engine under a good load at operating temperature, then shut it down and let the engine cool off for 8 hours or more. If the upper rad hose is still firm and opening the coolant reservoir cap releases air and pressure, the head gaskets have almost certainly failed.
How many miles is an LB7 good for?
Miscellaneous Parts. As we said earlier, the LB7 powered HD Sierras and Silverado’s are very reliable, and many you’ll find on the market have well over 300,000 miles on the original engine.
Why is there diesel in my oil?
This often happens in the region between the piston rings and the cylinder bore. Other factors include leaking of the fuel injectors, incomplete combustion of the fuel, low engine temperatures, long periods of idle time and frequent short-distance driving.
How much oil does a LB7 Duramax take?
10 quarts
LB7 Duramax Oil & Fluid Capacity
| Fluid/Oil Type | Capacity – Quarts |
|---|---|
| Engine Oil /w Filter | 10 quarts |
| Coolant /w Auto Trans. /w Manual Trans. | See below 20.3 quarts 20.7 quarts |
| Automatic Transmission Refill: After Overhaul: | See Below 7.4 quarts 12.7 quarts |
| ZF-6 Manual Transmission | 6.3 quarts |
What should a Duramax oil pressure be at idle?
Most run at 18-25 psi.
How much compression should a lb7 have?
Usually somewhere between 300 and 400 psi.
How much does it cost to replace a head gasket lb7?
For example, 2001-2004 LB7 models as well as 2004-2005 LYY models are more commonly having this issue, especially if the truck’s been driven hard and has high mileage….Duramax Head Gasket Replacement Cost.
| Minimum Cost Estimate | $3,500 |
|---|---|
| Maximum Cost Estimate | $7,000 |
| Average Cost Estimate | $4,500-$5,500 |
How do you tell if a diesel engine has a blown head gasket?
Signs your diesel tractor has a blown head gasket include:
- Radiator constantly needing to be topped up with water or coolant.
- An increased engine running temperature.
- Engine gauge showing maximum temperature after a few minutes.
- A cloud of exhaust fumes when idling, or white smoke coming from the exhaust.
