Chevy/GMC Duramax 01-04 LB7Discussion of Chevy and GMC Trucks with LB7 Duramax Turbo Diesel Engines
Recently I had the head gasket and injector's and the cups replace due to a coolant leak. I've now had it back for about three wks and it still loosing coolant. The top hose is not hard after run for awhile and I've bought a ... JOIN NOW TO REMOVE TRACER
Recently I had the head gasket and injector's and the cups replace due to a coolant leak. I've now had it back for about three wks and it still loosing coolant. The top hose is not hard after run for awhile and I've bought a new rad cap also and if you take the cap off while running there is no bubbles in the res. tank. I'm lost anybody got anything?
Well, think of all the places coolant goes and think of what signs it might leave. Start from the radiator and progress through each part of the entire engine back to the radiator. Did you have the head magnefluxed while it was off? (You would have mentioned that.) Apparently you don't have any overheating going on until the coolant is nearly gone.
Radiator: signs of leakage top, bottom, left, right, front back.
Lower radiator hose: Seepage at either end or drops in the middle. Sometimes leaks don't appear until the engine is good and warm.
Water pump: Leakage on the front of the engine.
Heater tubes: Rust and moisture.
Heater coil: Moisture in the cab floor or on the windshield when using the defroster.
Oil cooler: Moisture behind the oil filter mounting area, water in the oil.
Engine cooling jacket: Leaks at the front or back of the block, moisture in the tail pipe or steam in the morning with a cold engine, water in the oil. Also, super-heating the coolant and boiling it out while you drive.
Head gasket: (already changed) Water in the oil, super-heating the coolant and boiling it out while you drive, or leaking it into the oil.
Head: It might be warped and changing the gasket will not seal well around cylinders 3 & 4. A crack in the right place might cause coolant to get sucked into the cylinders with the intake air.
Thermostat: moisture around the thermostat housing.
Upper radiator hose: Moisture at either end or the middle.
i would check your oil after letting it sit for a few days the coolant will settle on the bottom of the oil pan because it will seporate from the oil i would also take a oil scan and send it in to see what they say they find in your oil. it is possible there is pitting in one or more of the cylinder walls and its leaking in the small pin holes. if the wrong coolant was used or no coolant just straight water was used, pitting in the cylinder walls is very comnon in diesels. how fast do you loose the coolant? if your not noticing anyhing on the ground when its parked then i would say your probably burning it or evaporating it out of the engine.
so your loosing a 1 gal around every tank of fuel? i would just start it on a clean cement pad and let it run for a hour or so and if you dont see any leaks on the ground. its going in your oil pan or your burning it, if you dont see anything on the ground obvoiusly. is it makind oil?
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