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Carhelp4u
Carhelp4u, ASE CERTIFIED TECH
Category: Car
Satisfied Customers: 5203
Experience:  ASE CERTIFICATION
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2001 silverado pu, w/ a 6.6 duramax..coolant..oil cooler..gaskets

Resolved Question:

I have a 2001 silverado pu, w/ a 6.6 duramax, and I have coolant leaking from one of the bolts holding the oil cooler to the block. I can''t find any other leaks, Is there a quick fix? Should I retork the bolts, or do I need to replace the gaskets?
Submitted: 8 years ago.
Category: Car
Expert:  Carhelp4u replied 8 years ago.
Is this coolant or oil? I see there are some problems with oil leaking, but no coolant issues.
Customer: replied 8 years ago.
This is coolant, there is no oil leakage at all.
Expert:  Carhelp4u replied 8 years ago.

Ok well you could try to retorque the bolts, but you will likely end up replacing the seals. I cannot say I have seen this as a problem. Here is what you will need to do to replace the seals. Its quite indepth. Feel free to contact me with any questions or if you would prefer a second opinion! Good luck!

Object Number: 309158  Size: SH

  • Drain the engine coolant and the engine block.
  • Raise the vehicle.
  • Remove the oil pan skid plate. (2WD shown).
    Object Number: 328107  Size: SH

  • Remove the crossbar (2WD shown).
    Object Number: 487521  Size: SH

  • Remove the crossbar (4WD shown).
    Object Number: 660299  Size: SH

  • Remove the oil filter.
    Object Number: 401885  Size: SH

  • Remove the left front tire.
  • Remove the left front fender wheelhouse inner panel (1).
    Object Number: 660519  Size: SH

  • Remove the 2 water pump outlet pipe nuts from water pump.
  • Remove the engine wiring harness retainer from the inner stud.
    Object Number: 739098  Size: SH

  • Remove the 2 nuts for the coolant duct from the engine flywheel housing.
  • Remove the 2 bolts for the coolant duct from the oil filter adapter and the oil cooler assembly.
  • Remove the coolant duct.
    Object Number: 739097  Size: SH

  • Remove the oil filter adapter and 5 oil cooler assembly bolts.
  • Remove the oil filter adapter and oil cooler assembly with the water pump outlet pipe.
  • Remove the oil filter adapter and oil cooler assembly 2 O-ring seals.
  • Remove the water pump outlet pipe from the oil cooler assembly.
  • Remove the water pump outlet pipe O-ring.
    Object Number: 663749  Size: SH

  • Clean the water pump outlet pipe.
  • Inspect the water pump outlet pipe for cracks.
  • Inspect the water pump outlet pipe mating surfaces for damage.
  • Clean the oil filter adapter.
  • Inspect the oil filter adapter mating surfaces for damage.
  • Replace any damaged components.Object Number: 739097  Size: SH

  • Install new O-rings to the oil cooler assembly.
  • Install a new O-ring onto the water pump outlet pipe.
  • Lubricate the O-ring with engine coolant.
  • Install the water pump outlet pipe to the oil filter adapter and oil cooler assembly.
  • Install the gasket for the water pump outlet pipe on the water pump.
  • Install the oil filter adapter and oil cooler assembly.

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  • Install the oil filter adapter and oil cooler assembly 5 bolts.

    Tighten
    Tighten the oil filter adapter and oil cooler assembly bolts to 21 N·m (15 lb ft).


    Object Number: 739098  Size: SH

  • Install a new seal in the coolant duct to the engine flywheel housing.
  • Install a new gasket for the coolant duct to the oil filter adapter and oil cooler assembly.
  • Install the 2 nuts for the coolant duct to engine flywheel housing.
  • Install the 2 bolts for the coolant duct to oil filter adapter assembly.

    Tighten

    Tighten the coolant duct bolts to 21 N·m (15 lb ft).
    Tighten the coolant duct nuts to 21 N·m (15 lb ft).

    Object Number: 660519  Size: SH

  • Install the engine wiring harness retainer on the water pump outlet pipe to water pump inner stud.
  • Install the water pump outlet pipe nuts.

    Tighten
    Tighten the water pump outlet pipe nuts to 25 N·m (18 lb ft).


    Object Number: 660299  Size: SH

  • Install the oil filter.

    Tighten
    Tighten the oil filter to contact plus 1 to 1-1/4 turn.


    Object Number: 487521  Size: SH

  • Install the cross bar (4WD vehicle).

    Tighten
    Tighten the cross bar bolts to 100 N·m (74 lb ft).


    Object Number: 328107  Size: SH

  • Install the cross bar (RWD vehicle).

    Tighten
    Tighten the cross bar bolts to 100 N·m (74 lb ft).


    Object Number: 309158  Size: SH

  • Install the oil pan skid plate. (RWD shown).

    Tighten
    Tighten the oil pan skid plate bolts to 20 N·m (15 lb ft).


    Object Number: 401885  Size: SH

  • Install the left front fender wheelhouse inner panel (1).
  • Install the left front tire.
  • Lower the vehicle.
  • Fill the engine coolant.
  • Inspect the engine oil level and add as necessary.
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