SO my 98 z34 3800 series 2 engine blew the heads at 135k from a faulty intake gastket that leaked water in the engine. So i ripped the heads off and bought a new pair. But i need the torque specs of the heads and also a maybe diagram on a few steps how to put it back together or some pictures of a process of doing it... Anything would be of help. Thank you!

 

To begin with, make sure you have everything you need. Head gaskets (some people say GM OEM head gaskets are the best, and there have been people whine that Felpro head gaskets are garbage), LIM gasket, UIM gasket, and a throttle body gasket if you took that off too. You will need new head bolts, rocker bolts, coolant elbows. I'm sure that there are more little things that you'll need too, maybe new injector o-rings, LIM o-rings. It's just a pain in the *** if you don't have everything you need - when you need it.

Anywho, you need a torque wrench and a torque angle gauge. The head bolts need to be tightened to 37 ft lbs and then turned 120*. The rocker bolts need to be tightened to 11 ft lbs and turned an additional 90*.

Other than that, just put everything back together opposite of the way you took it apart. Ensure the correct bolts go in their correct spots. Hopefully you sorted the bolts and don't have them jumbled together - that would be a mess. I'm currently putting my L67 back together and I made sure to keep my bolts for each part seperate. Buy GM Teflon Sealant or something similar for your LIM bolts, and make sure you put RTV on the corners of your LIM gaskets (where the rubber pieces meet the metal gaskets).

If you run into any problems along the way, I'll do my best to help.

 

Document ID# 167076
1998 Chevrolet/Geo Monte Carlo Cylinder Head Replacement Right Rear

Removal Procedure

Notice

Modifications made to the engine or its individual components can effect the vehicle's emission controls and may cause the Malfunction Indicator Lamp (MIL), Check Engine, or Service Engine Soon lamp to illuminate. Modifications may also cause the vehicle to fail a required Emission Inspection/Maintenance test.

1. Caution
   
   Before servicing any electrical component, the ignition key must be in the OFF or LOCK position and all electrical loads must be OFF, unless instructed otherwise in these procedures. If a tool or equipment could easily come in contact with a live exposed electrical terminal, also disconnect the negative battery cable. Failure to follow these precautions may cause personal injury and/or damage to the vehicle or its components.
   
2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
3. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement .
4. Remove the drive belt. Refer to Drive Belt Replacement .
5. Drain the engine coolant from the cooling system. Refer to Draining and Filling Cooling System in Engine Cooling.
6. Remove the generator. Refer to Generator Replacement or Generator Replacement .
7. Disconnect the three-way catalytic converter from the right exhaust manifold. Refer to Catalytic Converter Replacement in Engine Exhaust.
8. Remove the engine mount struts. Refer to Engine Mount Strut Replacement and Engine Mount Strut Replacement .
9. Rotate the engine forward for access.
10. Remove the drive belt tensioner. Refer to Intake Manifold Replacement .
11. Remove the power steering pump. Refer to Power Steering Pump Replacement in Power Steering System.
12. Remove the heater hoses from the engine. Refer to Heater Hoses Replacement in HVAC.
13. Remove the right spark plug wires. Refer to Spark Plug Wire Harness Replacement in Engine Electrical.
14. Remove the right spark plugs. Refer to Spark Plug Replacement in Engine Electrical.
15. Disconnect the oxygen sensor electrical connector.
16. Carefully remove the throttle body air inlet duct.
17. Disconnect the throttle and cruise control cables. Refer to Accelerator Controls Cable Replacement in Engine Controls - 3.8L.
18. Disconnect the electrical connector from the throttle vacuum line.
19. Remove the fuel rail. Refer to in Fuel Rail Assembly Replacement in Engine Controls - 3.8L.
    
    
20. Remove the exhaust gas recirculation (EGR) valve shield bracket bolt and nut.
21. Remove the EGR valve shield bracket.
    
    
22. Remove the EGR valve nuts.
23. Remove the EGR valve.
    
    
24. Remove the EGR valve outlet pipe bolt and nut.
25. Remove the EGR valve outlet pipe.
    
    
26. Remove the EGR valve adapter bolt from the right exhaust manifold.
    
    
27. Remove the EGR valve adapter bolts from the right cylinder head.
28. Remove the EGR valve adapter from the right cylinder head.
29. Remove the upper intake manifold. Refer to Intake Manifold Replacement .
30. Remove the engine lift hook.
31. Remove the exhaust crossover pipe. Refer to Exhaust Crossover Replacement .
32. Remove the right exhaust manifold. Refer to Exhaust Manifold Replacement .
33. Remove the right valve rocker arm cover. Refer to Valve Rocker Arm Cover Replacement .
34. Remove the right rocker arms and push rods. Refer to Valve Rocker Arm and Push Rod Replacement .
    
    
35. Remove the cylinder head bolts. Discard the cylinder head bolts.
36. Remove the cylinder head.
    
    
37. Remove the cylinder head gasket.
38. Remove the springs, the caps, the seals, and the valves from the cylinder head. Refer to Cylinder Head Disassemble .
39. Clean the mating surfaces on the cylinder head, cylinder block and the intake manifold.
40. Clean the cylinder block bolt hole threads. Repair the threads if necessary.
41. Inspect the engine block. Refer to Engine Block Cleaning and Inspection .
42. Inspect the cylinder head. Refer to Cylinder Head Clean and Inspect .

Installation Procedure

Notice

Modifications made to the engine or its individual components can effect the vehicle's emission controls and may cause the Malfunction Indicator Lamp (MIL), Check Engine, or Service Engine Soon lamp to illuminate. Modifications may also cause the vehicle to fail a required Emission Inspection/Maintenance test.


Tools Required J 36660-A Electronic Torque Angle Meter

1. Install the springs, the caps, the seals, and the valves to the cylinder head. Refer to Cylinder Head Assemble .
   
   
   Notice
   
   Head gaskets are not interchangeable. The head gasket must be installed with the arrow pointing to the front of the engine. Installing the head gasket in any other direction will cause gasket failure and possible engine failure.
   
2. Position the head gasket with the arrow pointing to the front of the engine.
   
   
3. Install the cylinder head.
   
   
   Notice
   
   This bolt is designed to permanently stretch when tightened. The correct part number fastener must be used to replace this type of fastener. Do not use a bolt that is stronger in this application. If the correct bolt is not used, the parts will not be tightened correctly. The system or the components may be damaged.
   
   
   Notice
   
   This engine uses special torque to yield head bolts. This design bolt requires a special tightening procedure. Failure to follow the given procedure will cause head gasket failure and possible engine damage.
   
   
   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.
   
4. Install the new cylinder head bolts. Tighten
   1. Tighten the cylinder head bolts in sequence to 50 N·m (37 lb ft).
   2. Rotate each cylinder head bolt 120 degrees in sequence. Use the J 36660-A .
   3. Use the J 36660-A in order to rotate the center four cylinder head bolts (1,2,3,4) an additional 30 degrees.
5. Install the right push rods and rocker arms. Refer to Valve Rocker Arm and Push Rod Replacement .
6. Install the right valve rocker arm cover. Refer to Valve Rocker Arm Cover Replacement .
7. Install the right exhaust manifold. Refer to Exhaust Manifold Replacement .
8. Install the exhaust crossover pipe. Refer to Exhaust Crossover Replacement .
9. Install the engine lift hook.
10. Install the upper intake manifold. Refer to Intake Manifold Replacement .
    
    
11. Install the EGR valve adapter to the right cylinder head.
12. Install the EGR valve adapter bolts to the right cylinder head. Tighten Tighten the EGR valve adapter bolts to 50 N·m (37 lb ft).
    
    
    
13. Install the EGR valve adapter bolt to the right exhaust manifold. Tighten Tighten the EGR valve adapter bolt to 29 N·m (21 lb ft).
    
    
    
14. Install the EGR valve outlet pipe.
15. Install the EGR valve outlet pipe bolt and nut. Tighten Tighten the EGR valve outlet pipe bolt and nut to 29 N·m (21 lb ft).
    
    
    
16. Install the EGR valve.
17. Install the EGR valve nuts. Tighten Tighten the EGR valve nuts to 29 N·m (21 lb ft).
    
    
    
18. Install the EGR valve shield bracket.
19. Install the EGR valve shield bracket bolt and nut. Tighten Tighten the EGR valve shield bracket bolt and nut to 10 N·m (89 lb in).
20. Install the fuel rail. Refer to Fuel Rail Assembly Replacement .
21. Connect the electrical connector to the throttle vacuum line.
22. Connect the throttle and cruise control cables. Refer to in Accelerator Controls Cable Replacement in Engine Controls - 3.8L.
23. Carefully install the throttle body air inlet duct.
24. Connect the oxygen sensor electrical connector.
25. Install the right spark plugs. Refer to Spark Plug Replacement in Engine Electrical.
26. Install the right spark plug wires. Refer to Spark Plug Wire Harness Replacement in Engine Electrical.
27. Install the heater hoses to the engine. Refer to Heater Hoses Replacement in HVAC.
28. Install the power steering pump. Refer to Power Steering Pump Replacement in Power Steering System.
29. Install the drive belt tensioner. Refer to Intake Manifold Replacement .
30. Return the engine to the proper position.
31. Install the engine mount struts. Refer to Engine Mount Strut Replacement and Engine Mount Strut Replacement .
32. Connect the three-way catalytic converter to the right exhaust manifold. Refer to Catalytic Converter Replacement in Engine Exhaust.
33. Install the generator. Refer to Generator Replacement or Generator Replacement .
34. Fill the cooling system with engine coolant. Refer to Draining and Filling Cooling System in Engine Cooling.
35. Install the drive belt. Refer to Drive Belt Replacement .
36. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement .
37. Connect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
38. Inspect for proper fluid levels.
39. Inspect for leaks.

 

Service Information Document ID# 202601
1998 Chevrolet/Geo Monte Carlo Cylinder Head Replacement Left Front

Removal Procedure

Notice

Modifications made to the engine or its individual components can effect the vehicle's emission controls and may cause the Malfunction Indicator Lamp (MIL), Check Engine, or Service Engine Soon lamp to illuminate. Modifications may also cause the vehicle to fail a required Emission Inspection/Maintenance test.

1. Caution
   
   Before servicing any electrical component, the ignition key must be in the OFF or LOCK position and all electrical loads must be OFF, unless instructed otherwise in these procedures. If a tool or equipment could easily come in contact with a live exposed electrical terminal, also disconnect the negative battery cable. Failure to follow these precautions may cause personal injury and/or damage to the vehicle or its components.
   
2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
3. Drain the cooling system of engine coolant. Refer to Draining and Filling Cooling System in Engine Cooling.
4. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement .
5. Carefully remove the throttle body air inlet duct.
6. Remove the left engine mount strut bracket.
7. Remove the right engine mount strut bracket. Refer to Engine Mount Strut Bracket Replacement .
8. Remove the upper intake manifold. Refer to Intake Manifold Replacement .
9. Remove the lower intake manifold. Refer to Intake Manifold Replacement .
10. Remove the left exhaust manifold. Refer to Exhaust Manifold Replacement .
11. Remove the left valve rocker arm cover. Refer to Valve Rocker Arm Cover Replacement .
12. Remove the left rocker arms and push rods. Refer to Valve Rocker Arm and Push Rod Replacement .
    
    
13. Remove the cylinder head bolts. Discard the cylinder head bolts.
14. Remove the cylinder head.
    
    
15. Remove the cylinder head gasket.
16. Remove the springs, the caps, the seals, and the valves from the cylinder head. Refer to Cylinder Head Disassemble .
17. Clean the mating surfaces on the cylinder head, cylinder block and the intake manifold.
18. Clean the cylinder block bolt hole threads. Repair the threads if necessary.
19. Inspect the engine block. Refer to Engine Block Cleaning and Inspection .
20. Inspect the cylinder head. Refer to Cylinder Head Clean and Inspect .

Installation Procedure

Notice

Modifications made to the engine or its individual components can effect the vehicle's emission controls and may cause the Malfunction Indicator Lamp (MIL), Check Engine, or Service Engine Soon lamp to illuminate. Modifications may also cause the vehicle to fail a required Emission Inspection/Maintenance test.


Tools Required J 36660-A Electronic Torque Angle Meter

1. Install the springs, the caps, the seals, and the valves to the cylinder head. Refer to Cylinder Head Assemble .
   
   
2. Position the head gasket with the arrow pointing to the front of the engine.
   
   
3. Install the cylinder head.
   
   
   Notice
   
   This bolt is designed to permanently stretch when tightened. The correct part number fastener must be used to replace this type of fastener. Do not use a bolt that is stronger in this application. If the correct bolt is not used, the parts will not be tightened correctly. The system or the components may be damaged.
   
   
   Notice
   
   This engine uses special torque to yield head bolts. This design bolt requires a special tightening procedure. Failure to follow the given procedure will cause head gasket failure and possible engine damage.
   
   
   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.
   
4. Install the new cylinder head bolts. Tighten
   • Tighten the cylinder head bolts in sequence to 50 N·m (37 lb ft).
   • Rotate each cylinder head bolt 120 degrees in sequence. Use the J 36660-A .
   • Use the J 36660-A in order to rotate the center four cylinder head bolts (1,2,3,4) an additional 30 degrees.
5. Install the left push rods and rocker arms. Refer to Valve Rocker Arm and Push Rod Replacement .
6. Install the left valve rocker arm cover. Refer to Valve Rocker Arm Cover Replacement .
7. Install the left exhaust manifold. Refer to Exhaust Manifold Replacement .
8. Install the lower intake manifold. Refer to Intake Manifold Replacement .
9. Install the upper intake manifold. Refer to Intake Manifold Replacement .
10. Install the right engine mount strut bracket. Refer to Engine Mount Strut Bracket Replacement .
11. Install the left engine mount strut bracket.
12. Carefully install the throttle body air inlet duct.
13. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement .
14. Fill the cooling system with engine coolant. Refer to Draining and Filling Cooling System in Engine Cooling.
15. Connect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
16. Inspect for proper fluid levels.
17. Inspect for leaks.

 

right on guys, thanks so much this will help!

 

What manual is that, that you got those instructions/diagrams from. Is it a computer program. If so could you please tell me which one it is. Im working on a buddies 1997 Monte Carlo 3.1 V6 and am doing a head assembly (well 2 head assemblies) and would be nice to have the program and torque specs.

Thanks all. Everybody here seems nice and cool to eachother.

 

It is software called ESI. It is what the dealerships use for shop manuals now.

 

This thead helps out alot! I had to replace the EGR valve. Thanks!

 

Am I the only one who at first thought the title said "red heads, need torque specs" ?

 

Where do you get that manual software from?

And is there anyway you can get a J 36660-A tool without having to buy it? Like is that something rentable? As $1k+ on a special tool defeats the ability to DIY.