I just got a 07.5 duramax it has 175000 ish on it,does not want to hold good oil pressure would stay right below the 30 mark on the gauge all the time unless you just started it then it is higher. When i would come to a stop and start to accelerate the low pressure light would come on for a brief second then go off the gauge wouldn't move at all. The turbo then started to make a bad wining noise that went away after it would build about 7 or so pounds of boost. Started home with it after he gave me a 24 month warrenty, made it 400 mile stoped to get fuel started the truck up and it wouldn't hold any oil prussure at idle but it would if you reved it up then i heard a loud noise from the turbo like a churp so i turned the engine off and pulled the mouthpiece to the turbo off and turbo shaft had a lot of play,and i mean a lot. Had it towed to a diesel shop. If the turbo is bad would it be part of the low oil pressure problem at idle? It also lost some of its coolent the tank was almost empty! Any thoughts any one?
LMM: Bad turbo
- Thread starter vadmaxjoe
- Start date
idk if it does for sure but my truck dne the same thing oil pressure started actin weird and the shaft has alot of play i have the lly turbo on my lb7
well this turbo job has turned into a headach. Had it at two differant shops no one wants to do it for the price they quote me said to much stuff to remove its a bunch of BS going to do it my self> anyone have pointers or any info that may make any easier? pics any thing will help
Turbocharger Replacement
Takes about 2 days if you havent done it before. The worst part is the upper up-pipe bolts. A 12 point 12mm socket with a 2 1/2" ext.
Good Luck
'
Removal Procedure
Notice: If a turbocharger has failed, clean any turbocharger debris or excessive oil from the charge air cooler system before installing the new turbocharger. Failure to clean debris from the charge air cooler system will cause severe turbocharger and engine damage upon start-up. Failure to clean excessive oil from the charge air cooler system may cause an engine runaway condition on start-up, resulting in severe engine damage.
Important: If a turbocharger failure is thought to be caused due to lack of oil, the camshaft bearing should be checked. The number 4 camshaft bearing bore feeds the turbocharger oil supply (feed) pipe. If this camshaft bearing spins in the bore, the turbocharger will be starved for oil. This will cause a failure of the turbocharger. Failure to diagnosis this condition will result in repeat turbocharger failures.
1. Disconnect the negative battery cable.
2. Raise the hood to the service position and perform the following:
1. Remove the hood hinge bolts (1).
2. Raise the hood until vertical.
3. Install the hood hinge bolts until snug, in the service position (2).
3. Remove the left and right wheelhouse liners.
4. Loosen the exhaust pipe clamp. Slide the clamp onto the exhaust pipe.
5. If equipped with an automatic transmission, remove the transmission fill tube to bellhousing nuts.
6. Lift the fill tube up from the studs and reposition the tube to the right side of the vehicle. The tube does not require removal from the transmission.
7. Remove the left exhaust pipe heat shield bolts.
8. Remove the heat shield.
9. Important: Do not bend the exhaust pipe at the expansion area. Remove the left exhaust pipe to exhaust manifold bolts.
10. Remove and discard the exhaust manifold gasket.
11. Important: Do not bend the exhaust pipe at the expansion area. Remove the right exhaust pipe to exhaust manifold bolts.
12. Remove and discard the exhaust manifold gasket.
13. Remove the lower bolt for the exhaust outlet shield.
14. Drain the cooling system.
15. Remove the air cleaner outlet duct.
16. Loosen the charged air cooler outlet duct to intake hose clamp.
17. Important: Do not use a screwdriver or other tool to pry the hose loose. The hose can be torn or damage. Loosen the hose by twisting. Remove the charged air cooler outlet duct from the intake.
18. Important: After removing the charged air cooler duct, cover the turbocharger opening with tape in order to prevent entry of objects. Loosen the charged air cooler inlet duct connector to turbocharger clamp (1).
19. Important: Do not use a screwdriver or other tool to pry the hose loose. The hose can be torn or damage. Loosen the hose by twisting. Remove the charged air cooler inlet duct connector (4) from the turbocharger.
20. Remove the turbocharger inlet coolant hose from the turbocharger coolant bypass valve.
21. Important: Use care not to damage this hose during the procedure. Reposition the hose clamp and remove the turbocharger outlet coolant hose from the turbocharger.
22. Remove the turbocharger outlet coolant pipe banjo bolt and washers.
23. Remove the Positive Crankcase Ventilation (PCV) hose/pipe.
24. Remove the turbocharger upper heat shield bolts.
25. Remove the turbocharger upper heat shield.
26. Remove the remaining exhaust outlet heat shield bolts.
27. Remove the exhaust outlet heat shield.
28. Loosen the exhaust outlet clamp.
29. Remove the exhaust outlet.
30. Remove the right exhaust pipe to turbocharger bolts.
31. Remove the right exhaust pipe.
32. Remove and discard the gasket.
33. Remove the left exhaust pipe to turbocharger bolts.
34. Remove the left exhaust pipe.
35. Remove and discard the gasket.
36. Remove the turbocharger oil feed pipe banjo bolt and washer.
37. Reposition the oil feed pipe out of the way.
38. Remove the turbocharger oil return pipe nuts at the top of the flywheel housing.
39. Remove the turbocharger bolts.
40. Remove the turbocharger (with the oil return pipe).
41. Remove and discard the turbocharger oil return pipe gasket at the flywheel housing.
42. Remove the turbocharger lower heat shield, if necessary.
43. Remove the oil feed pipe bolt, washer, and pipe, if necessary.
44. If the turbocharger has failed, perform the following steps the verify the condition of the number 4 camshaft bearing before installing a new turbocharger.
1. Visually inspect for correct alignment of the number 4 camshaft bearing oil hole through the turbocharger oil supply hole in the block.
2. Turn the engine over by hand 1/2 turn and inspect for camshaft bearing movement, indicating a spun camshaft bearing.
3. If the bearing is spun the engine MUST be replaced.
45. If replacing the turbocharger, remove the oil return pipe bolts, pipe and gasket. Discard the gasket.
46. Clean all turbocharger to engine gasket mating surfaces.
47. If required, clean and inspect the turbocharger.
Installation Procedure
1. Notice: Refer to Fastener Notice in Service Precautions. If the turbocharger was replaced, install the oil return pipe, bolts, and a NEW gasket. Tighten the bolts to 21 Nm (15 ft. lbs.) .
2. Important: Lubricate the washer with diesel fuel prior to installing. Install the oil feed pipe, washer, and bolt, if necessary. Tighten the bolt to 34 Nm (25 ft. lbs.) .
3. Install the turbocharger lower heat shield, if necessary.
4. Install a NEW turbocharger oil return pipe gasket at the flywheel housing.
5. Install the turbocharger (with the oil return pipe).
6. Install the turbocharger bolts. Tighten the bolts to 108 Nm (80 ft. lbs.) .
7. Install the turbocharger oil return pipe nuts at the top of the flywheel housing. Tighten the nuts to 25 Nm (18 ft. lbs.) .
8. If installing a NEW turbocharger, add about 120 - 150 cc (4 - 5 ounces) of clean engine oil in the turbocharger oil feed pipe opening while rotating the impeller.
9. Position the oil feed pipe to the turbocharger.
10. Install a NEW turbocharger oil feed pipe washer and the banjo bolt. Tighten the bolt to 34 Nm (25 ft. lbs.) .
11. Install the left exhaust pipe and a NEW gasket.
12. Install the left exhaust pipe to turbocharger bolts. Tighten the bolt to 53 Nm (39 ft. lbs.) .
13. Install the right exhaust pipe and a NEW gasket.
14. Install the right exhaust pipe to turbocharger bolts. Tighten the bolt to 53 Nm (39 ft. lbs.) .
15. Install the exhaust outlet.
16. Tighten the exhaust outlet clamp. Tighten the clamp to 15 Nm (11 ft. lbs.) .
17. Install the exhaust outlet heat shield.
18. Install the remaining exhaust outlet heat shield bolts. Tighten the bolt to 8 Nm (71 inch lbs.) .
19. Install the PCV hose/pipe.
20. If the cooling outlet hose eye bolts were removed, install the longer bolt (1) with 2 holes, in the top location. Install the shorter bolt (2) in the lower location.
21. Install the turbocharger outlet coolant pipe banjo bolt and washers. Tighten the bolt to 26 Nm (19 ft. lbs.) .
22. Install the turbocharger outlet coolant hose to the turbocharger and position the hose clamp.
23. Install the turbocharger inlet coolant hose to the turbocharger coolant bypass valve.
24. Install the turbocharger upper heat shield.
25. Install the turbocharger upper heat shield bolts. Tighten the bolt to 9 Nm (80 inch lbs.) .
26. Remove the tape from the turbocharger openings. Important: Lubricate the end of the duct prior to installation.
27. Install the charged air cooler inlet duct connector (4) to the turbocharger.
28. Tighten the charged air cooler inlet duct connector to turbocharger clamp (1). Tighten the clamp to 6 Nm (53 inch lbs.) .
29. Important: Lubricate the end of the duct prior to installation. Install the charged air cooler outlet duct to the intake.
30. Tighten the charged air cooler outlet duct to intake hose clamp. Tighten the clamp to 6 Nm (53 inch lbs.) .
31. Fill the cooling system.
32. Install the lower bolt for the exhaust outlet shield. Tighten the bolt to 8 Nm (71 inch lbs.) .
33. Install a NEW exhaust manifold gasket.
34. Install the right exhaust pipe to exhaust manifold bolts. Tighten the bolts to 53 Nm (39 ft. lbs.) .
35. Install a NEW exhaust manifold gasket.
36. Install the left exhaust pipe to exhaust manifold bolts. Tighten the bolts to 53 Nm (39 ft. lbs.) .
37. Install the heat shield.
38. Install the left exhaust pipe heat shield bolts. Tighten the bolts to 8 Nm (71 inch lbs.) .
39. If equipped with an automatic transmission, position the fill tube to the studs.
40. Install the transmission fill tube to bellhousing nuts. Tighten the nuts to 18 Nm (13 ft. lbs.) .
41. Slide the clamp onto the exhaust pipe. Tighten the exhaust pipe clamp. Tighten the clamp to 40 Nm (30 ft. lbs.) .
42. Connect the negative battery cable.
43. If a NEW turbocharger was installed, perform the turbocharger learn procedure.
44. Road test the vehicle for normal operation.
45. Inspect for coolant, oil, or exhaust leaks. Correct as necessary.
46. Perform the turbocharger learn procedure.
Takes about 2 days if you havent done it before. The worst part is the upper up-pipe bolts. A 12 point 12mm socket with a 2 1/2" ext.
Good Luck
'
Removal Procedure
Notice: If a turbocharger has failed, clean any turbocharger debris or excessive oil from the charge air cooler system before installing the new turbocharger. Failure to clean debris from the charge air cooler system will cause severe turbocharger and engine damage upon start-up. Failure to clean excessive oil from the charge air cooler system may cause an engine runaway condition on start-up, resulting in severe engine damage.
Important: If a turbocharger failure is thought to be caused due to lack of oil, the camshaft bearing should be checked. The number 4 camshaft bearing bore feeds the turbocharger oil supply (feed) pipe. If this camshaft bearing spins in the bore, the turbocharger will be starved for oil. This will cause a failure of the turbocharger. Failure to diagnosis this condition will result in repeat turbocharger failures.
1. Disconnect the negative battery cable.
2. Raise the hood to the service position and perform the following:
1. Remove the hood hinge bolts (1).
2. Raise the hood until vertical.
3. Install the hood hinge bolts until snug, in the service position (2).
3. Remove the left and right wheelhouse liners.
4. Loosen the exhaust pipe clamp. Slide the clamp onto the exhaust pipe.
5. If equipped with an automatic transmission, remove the transmission fill tube to bellhousing nuts.
6. Lift the fill tube up from the studs and reposition the tube to the right side of the vehicle. The tube does not require removal from the transmission.
7. Remove the left exhaust pipe heat shield bolts.
8. Remove the heat shield.
9. Important: Do not bend the exhaust pipe at the expansion area. Remove the left exhaust pipe to exhaust manifold bolts.
10. Remove and discard the exhaust manifold gasket.
11. Important: Do not bend the exhaust pipe at the expansion area. Remove the right exhaust pipe to exhaust manifold bolts.
12. Remove and discard the exhaust manifold gasket.
13. Remove the lower bolt for the exhaust outlet shield.
14. Drain the cooling system.
15. Remove the air cleaner outlet duct.
16. Loosen the charged air cooler outlet duct to intake hose clamp.
17. Important: Do not use a screwdriver or other tool to pry the hose loose. The hose can be torn or damage. Loosen the hose by twisting. Remove the charged air cooler outlet duct from the intake.
18. Important: After removing the charged air cooler duct, cover the turbocharger opening with tape in order to prevent entry of objects. Loosen the charged air cooler inlet duct connector to turbocharger clamp (1).
19. Important: Do not use a screwdriver or other tool to pry the hose loose. The hose can be torn or damage. Loosen the hose by twisting. Remove the charged air cooler inlet duct connector (4) from the turbocharger.
20. Remove the turbocharger inlet coolant hose from the turbocharger coolant bypass valve.
21. Important: Use care not to damage this hose during the procedure. Reposition the hose clamp and remove the turbocharger outlet coolant hose from the turbocharger.
22. Remove the turbocharger outlet coolant pipe banjo bolt and washers.
23. Remove the Positive Crankcase Ventilation (PCV) hose/pipe.
24. Remove the turbocharger upper heat shield bolts.
25. Remove the turbocharger upper heat shield.
26. Remove the remaining exhaust outlet heat shield bolts.
27. Remove the exhaust outlet heat shield.
28. Loosen the exhaust outlet clamp.
29. Remove the exhaust outlet.
30. Remove the right exhaust pipe to turbocharger bolts.
31. Remove the right exhaust pipe.
32. Remove and discard the gasket.
33. Remove the left exhaust pipe to turbocharger bolts.
34. Remove the left exhaust pipe.
35. Remove and discard the gasket.
36. Remove the turbocharger oil feed pipe banjo bolt and washer.
37. Reposition the oil feed pipe out of the way.
38. Remove the turbocharger oil return pipe nuts at the top of the flywheel housing.
39. Remove the turbocharger bolts.
40. Remove the turbocharger (with the oil return pipe).
41. Remove and discard the turbocharger oil return pipe gasket at the flywheel housing.
42. Remove the turbocharger lower heat shield, if necessary.
43. Remove the oil feed pipe bolt, washer, and pipe, if necessary.
44. If the turbocharger has failed, perform the following steps the verify the condition of the number 4 camshaft bearing before installing a new turbocharger.
1. Visually inspect for correct alignment of the number 4 camshaft bearing oil hole through the turbocharger oil supply hole in the block.
2. Turn the engine over by hand 1/2 turn and inspect for camshaft bearing movement, indicating a spun camshaft bearing.
3. If the bearing is spun the engine MUST be replaced.
45. If replacing the turbocharger, remove the oil return pipe bolts, pipe and gasket. Discard the gasket.
46. Clean all turbocharger to engine gasket mating surfaces.
47. If required, clean and inspect the turbocharger.
Installation Procedure
1. Notice: Refer to Fastener Notice in Service Precautions. If the turbocharger was replaced, install the oil return pipe, bolts, and a NEW gasket. Tighten the bolts to 21 Nm (15 ft. lbs.) .
2. Important: Lubricate the washer with diesel fuel prior to installing. Install the oil feed pipe, washer, and bolt, if necessary. Tighten the bolt to 34 Nm (25 ft. lbs.) .
3. Install the turbocharger lower heat shield, if necessary.
4. Install a NEW turbocharger oil return pipe gasket at the flywheel housing.
5. Install the turbocharger (with the oil return pipe).
6. Install the turbocharger bolts. Tighten the bolts to 108 Nm (80 ft. lbs.) .
7. Install the turbocharger oil return pipe nuts at the top of the flywheel housing. Tighten the nuts to 25 Nm (18 ft. lbs.) .
8. If installing a NEW turbocharger, add about 120 - 150 cc (4 - 5 ounces) of clean engine oil in the turbocharger oil feed pipe opening while rotating the impeller.
9. Position the oil feed pipe to the turbocharger.
10. Install a NEW turbocharger oil feed pipe washer and the banjo bolt. Tighten the bolt to 34 Nm (25 ft. lbs.) .
11. Install the left exhaust pipe and a NEW gasket.
12. Install the left exhaust pipe to turbocharger bolts. Tighten the bolt to 53 Nm (39 ft. lbs.) .
13. Install the right exhaust pipe and a NEW gasket.
14. Install the right exhaust pipe to turbocharger bolts. Tighten the bolt to 53 Nm (39 ft. lbs.) .
15. Install the exhaust outlet.
16. Tighten the exhaust outlet clamp. Tighten the clamp to 15 Nm (11 ft. lbs.) .
17. Install the exhaust outlet heat shield.
18. Install the remaining exhaust outlet heat shield bolts. Tighten the bolt to 8 Nm (71 inch lbs.) .
19. Install the PCV hose/pipe.
20. If the cooling outlet hose eye bolts were removed, install the longer bolt (1) with 2 holes, in the top location. Install the shorter bolt (2) in the lower location.
21. Install the turbocharger outlet coolant pipe banjo bolt and washers. Tighten the bolt to 26 Nm (19 ft. lbs.) .
22. Install the turbocharger outlet coolant hose to the turbocharger and position the hose clamp.
23. Install the turbocharger inlet coolant hose to the turbocharger coolant bypass valve.
24. Install the turbocharger upper heat shield.
25. Install the turbocharger upper heat shield bolts. Tighten the bolt to 9 Nm (80 inch lbs.) .
26. Remove the tape from the turbocharger openings. Important: Lubricate the end of the duct prior to installation.
27. Install the charged air cooler inlet duct connector (4) to the turbocharger.
28. Tighten the charged air cooler inlet duct connector to turbocharger clamp (1). Tighten the clamp to 6 Nm (53 inch lbs.) .
29. Important: Lubricate the end of the duct prior to installation. Install the charged air cooler outlet duct to the intake.
30. Tighten the charged air cooler outlet duct to intake hose clamp. Tighten the clamp to 6 Nm (53 inch lbs.) .
31. Fill the cooling system.
32. Install the lower bolt for the exhaust outlet shield. Tighten the bolt to 8 Nm (71 inch lbs.) .
33. Install a NEW exhaust manifold gasket.
34. Install the right exhaust pipe to exhaust manifold bolts. Tighten the bolts to 53 Nm (39 ft. lbs.) .
35. Install a NEW exhaust manifold gasket.
36. Install the left exhaust pipe to exhaust manifold bolts. Tighten the bolts to 53 Nm (39 ft. lbs.) .
37. Install the heat shield.
38. Install the left exhaust pipe heat shield bolts. Tighten the bolts to 8 Nm (71 inch lbs.) .
39. If equipped with an automatic transmission, position the fill tube to the studs.
40. Install the transmission fill tube to bellhousing nuts. Tighten the nuts to 18 Nm (13 ft. lbs.) .
41. Slide the clamp onto the exhaust pipe. Tighten the exhaust pipe clamp. Tighten the clamp to 40 Nm (30 ft. lbs.) .
42. Connect the negative battery cable.
43. If a NEW turbocharger was installed, perform the turbocharger learn procedure.
44. Road test the vehicle for normal operation.
45. Inspect for coolant, oil, or exhaust leaks. Correct as necessary.
46. Perform the turbocharger learn procedure.