Front Engine Mount Chevrolet TrailBlazer I

Front Engine Mount

Note. Broken or deteriorated mounts can cause misalignment and destruction of certain drive train components. When a single mount breaks, the remaining mounts are subjected to abnormally high stresses.

Scheme 1214

1. Install a pole jack underneath the oil pan.
2. Insert a block of wood between the engine oil pan and the pole jack.
3. Raise the jack until the wooden block contacts the engine oil pan.
4. Raise the engine in order to place a slight tension on the rubber cushion. Observe both mounts while raising the engine.
5. Replace the mounts if any of the following conditions exist: Hard rubber surface covered with heat check cracks The rubber cushion separated from the metal plate of the mount The rubber cushion is split through the center The mount is leaking
6. If there is movement between a metal plate of the mount and its attaching points, lower the engine and tighten the bolts or nuts attaching the mount to the engine, the frame or the bracket.

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Scheme 1221

1. Disconnect the negative battery cable. Refer to BATTERY NEGATIVE CABLE DISCONNECT/CONNECT PROCEDURE in Engine Electrical.
2. Remove the cooling fan. Refer to COOLING FAN AND SHROUD REPLACEMENT in Engine Cooling.
3. Remove the MAP sensor electrical connector and the retainer (1).
4. Remove the MAP sensor (2).
5. Remove the left shock module (if frame mount is being removed). Refer to SHOCK MODULE REPLACEMENT in Front Suspension.
6. Remove the right and the left upper engine mount nuts.
7. Raise the vehicle. Refer to «LIFTING AND JACKING THE VEHICLE»(ref-188480-S19457848752005090300000) in General Information.
8. Remove the right and the left lower engine mount nuts.
9. Remove the engine protection shield mount bolts.
10. Remove the engine protection shield. IMPORTANT: When placing jack onto the oil pan, pay close attention to not damage the oil level sender.
11. Lower the vehicle and place a floor jack under the oil pan with a block of wood.
12. Raise the engine with the jack just enough to clear the engine mount studs.
13. Remove the left engine mount from the bracket.
14. Remove the left engine mount bracket bolts.
15. Remove the left engine mount bracket.
16. Remove the left frame engine mount bracket bolts, if required.
17. Remove the left frame engine mount bracket, if required.

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Scheme 1229

1. Install the left frame engine mount bracket, if removed. NOTE: Refer to «FASTENER NOTICE»(ref-175132-S17785009232005041500000) in Cautions and Notices.
2. Install the left frame engine mount bracket bolts, if removed. Tighten Tighten the mount bracket bolts to 110 N.m (81 lb ft).
3. Install the left engine mount bracket and secure the bracket with the bolts (1). Tighten Tighten the engine mount bracket bolts to 50 N.m (37 lb ft).
4. Install the left engine mount onto the bracket.
5. Lower the engine onto the engine mounts.
6. Install the right and the left upper engine mount nuts. Tighten Tighten the upper engine mount nuts to 70 N.m (52 lb ft).
7. Raise the vehicle and remove the jack from under the vehicle.
8. Install the engine protection shield and secure the shield with the bolts. Tighten Tighten the engine protection shield bolts to 25 N.m (18 lb ft).
9. Install the right and the left lower engine mount nuts. Tighten Torque the lower engine mount nuts to 70 N.m (52 lb ft).
10. Lower the vehicle.
11. Install the left shock module. Refer to SHOCK MODULE REPLACEMENT in Front Suspension.
12. Install the MAP sensor (2).
13. Install the MAP sensor retainer (1) and the electrical connector.
14. Connect the cooling fan hub nut to the water pump shaft.
15. Install the cooling fan. Refer to COOLING FAN AND SHROUD REPLACEMENT in Engine Cooling.
16. Connect the battery negative cable. Refer to BATTERY NEGATIVE CABLE DISCONNECT/CONNECT PROCEDURE in Engine Electrical.

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Scheme 1236

1. Disconnect the battery negative cable. Refer to BATTERY NEGATIVE CABLE DISCONNECT/CONNECT PROCEDURE in Engine Electrical.
2. Remove the cooling fan. Refer to COOLING FAN AND SHROUD REPLACEMENT in Engine Cooling.
3. Remove the MAP sensor electrical connector and retainer (1).
4. Remove the MAP sensor (2).
5. Remove the right shock module, if frame engine mount is being removed. Refer to SHOCK MODULE REPLACEMENT in Front Suspension.
6. Remove the right and the left upper engine mount nuts.
7. Raise the vehicle. Refer to «LIFTING AND JACKING THE VEHICLE»(ref-188480-S19457848752005090300000) in General Information.
8. Remove the right and the left lower engine mount nuts.
9. Remove the engine protection shield mounting bolts.
10. Remove the engine protection shield. IMPORTANT: When placing jack onto the oil pan, pay close attention to not damaging the oil level sender.
11. Lower the vehicle and place a floor jack under the oil pan with a block of wood.
12. Raise the engine with the jack just enough to clear the engine mount studs.
13. Remove the right engine mount from the bracket.
14. Remove the right engine mount bracket bolts.
15. Remove the right engine mount bracket.
16. Remove the right frame engine mount bracket bolts, if required.
17. Remove the right frame engine mount bracket, if required.

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Scheme 1243

1. Install the right frame engine mount bracket, if removed.
2. Install the right frame engine mount bracket bolts, if removed. Tighten Tighten the mount bracket bolts to 110 N.m (81 lb ft).
3. Install the right engine mount bracket and secure with the bolts (1). Tighten Tighten the engine mount bracket bolts to 50 N.m (37 lb ft).
4. Install the right engine mount.
5. Lower the engine onto the engine mounts.
6. Install the right and the left upper engine mount nuts. Tighten Tighten the upper engine mount nuts to 70 N.m (52 lb ft).
7. Raise the vehicle and remove the floor jack from under the vehicle.
8. Install the engine protection shield and secure with the bolts. Tighten Tighten the engine protection shield bolts to 25 N.m (18 lb ft).
9. Install the right and the left lower engine mount nuts. Tighten Tighten the lower engine mount nuts to 70 N.m (52 lb ft).
10. Lower the vehicle.
11. Install the right shock module. Refer to SHOCK MODULE REPLACEMENT in Front Suspension.
12. Install the MAP sensor (2).
13. Install the MAP sensor retainer (1) and the electrical connector.
14. Connect the cooling fan hub nut to the water pump shaft.
15. Install the cooling fan. Refer to COOLING FAN AND SHROUD REPLACEMENT in Engine Cooling.
16. Connect the battery negative cable. Refer to BATTERY NEGATIVE CABLE DISCONNECT/CONNECT PROCEDURE in Engine Electrical.

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Scheme 1247

1. Disconnect the crankcase dirty air hose from the intake manifold.
2. Disconnect the crankcase dirty air hose from the PCV orifice tube.
3. Loosen the throttle body clamps (2).
4. Disconnect the fuel pressure regulator vacuum supply hose from the air cleaner outlet resonator.
5. Remove the 2 resonator to engine bolts (4) from the air cleaner outlet resonator (5).
6. Lift up the front of the air cleaner outlet resonator (2).
7. Disconnect the crankcase clean air hose from the valve cover port.
8. Disconnect the crankcase clean air hose from the air cleaner outlet resonator (2).

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Scheme 1251

1. Connect the crankcase clean air hose to the air cleaner outlet resonator (2).
2. Connect the crankcase clean air hose to the valve cover port. NOTE: Refer to «FASTENER NOTICE»(ref-175132-S17785009232005041500000) in Cautions and Notices.
3. Install the 2 resonator to engine bolts (4) to the air cleaner outlet resonator (5). Tighten Tighten the bolts to 6 N.m (53 lb in).
4. Tighten the throttle body clamps (2). Tighten Tighten the clamps to 4 N.m (35 lb in).
5. Connect the fuel pressure regulator vacuum supply hose to the air cleaner outlet resonator.
6. Connect the crankcase dirty air hose to the intake manifold.
7. Connect the crankcase dirty air hose to the PCV orifice tube.

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Scheme 1255

1. Remove the throttle body. Refer to «THROTTLE BODY»(ref-159085-S22330361012003111100000) .
2. Remove the PCM. Refer to «POWERTRAIN CONTROL MODULE»(ref-159085-S36870747962003111100000) .
3. Disconnect all harnesses from the engine harness bracket.
4. Remove the front differential vent hose from the bracket clip.
5. Remove the engine harness bracket bolt and remove the bracket.
6. Disconnect the MAP sensor electrical connector.
7. Disconnect the crankcase ventilation hose.
8. Disconnect the brake hose at the booster.
9. Remove the generator. Refer to GENERATOR REPLACEMENT (4.2L ENGINE) in Engine Electrical.
10. Loosen and remove the intake manifold bolts.
11. Remove the intake manifold.

Scheme 1256

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Scheme 1259

1. Install a new intake manifold gasket. NOTE: Refer to «FASTENER NOTICE»(ref-175132-S17785009232005041500000) in Cautions and Notices.
2. Install the intake manifold onto the engine and secure the manifold with the bolts. Tighten Tighten the intake manifold bolts to 10 N.m (89 lb in).
3. Install the generator. Refer to GENERATOR REPLACEMENT (4.2L ENGINE) or in Engine Electrical.
4. Install the brake hose to the booster.
5. Lubricate the inner diameter of the crankcase ventilation hose with GM P/N 12345884 (Canadian P/N 5728223) or equivalent.
6. Install the crankcase ventilation hose.
7. Install the MAP sensor electrical connector.
8. Install the engine harness bracket. Secure the bracket with the bolt. Tighten Tighten the engine harness bracket bolt to 50 N.m (37 lb ft).
9. Install the front differential vent hose to the engine harness bracket clip.
10. Install all harnesses to the original location onto the engine harness bracket.
11. Install the PCM. Refer to «POWERTRAIN CONTROL MODULE»(ref-159085-S36870747962003111100000) .
12. Install the throttle body. Refer to «THROTTLE BODY»(ref-159085-S22330361012003111100000) .

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Scheme 1266

1. Remove the intake manifold. Refer to «INTAKE MANIFOLD REPLACEMENT»(ref-188499-S37928601202005090700000) .
2. Discharge the A/C. Refer to REFRIGERANT RECOVERY AND RECHARGING in Heating, Ventilation and Air Conditioning.
3. Remove the A/C line at the oil level indicator tube bracket nut.
4. Remove the A/C line from the accumulator.
5. Remove the A/C bracket bolt from the engine lift hook.
6. Remove the engine lift bracket.
7. Disconnect the ignition control module electrical connectors.
8. Loosen and remove the ignition control module bolts.
9. Remove the ignition control module.
10. Disconnect the engine electrical harness housing from the camshaft cover (1) taking care not to damage the clips that hold the housing in place.
11. Disconnect the fuel injection harness electrical connector.
12. Loosen and remove the camshaft cover bolts.
13. Remove the camshaft cover.
14. Clean and inspect the camshaft cover. Refer to «Camshaft Cover Cleaning and Inspection»(ref-188499-S17561042992005090700000) .

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1. Install a new camshaft cover seal.
2. Install new rubber ignition control module seals. NOTE: Refer to «FASTENER NOTICE»(ref-175132-S17785009232005041500000) in Cautions and Notices.
3. Install the camshaft cover and secure with the cam cover bolts. Tighten Tighten the camshaft cover bolts to 10 N.m (89 lb in).
4. Install the ignition control modules and secure the modules with bolts. Tighten Tighten the ignition coil bolts to 10 N.m (89 lb in).
5. Connect the ignition control module electrical connectors.
6. Install the fuel injector electrical connectors.
7. Install the engine electrical harness housing (1).
8. Install the A/C line bracket to the oil level indicator tube stud and secure the bracket with the nut. Tighten Tighten the A/C line bracket nut to 7 N.m (62 lb in).
9. Install the engine lift bracket and secure the lift hook with the bolts. Tighten Tighten the lift bracket bolts to 50 N.m (37 lb ft).
10. Install the A/C line bracket to the engine lift bracket and secure the A/C bracket with the bolt. Tighten Tighten the A/C bracket bolt to 10 N.m (89 lb in).
11. Install the intake manifold. Refer to «INTAKE MANIFOLD REPLACEMENT»(ref-188499-S37928601202005090700000) .
12. Recharge the A/C system. Refer to REFRIGERANT RECOVERY AND RECHARGING in Heating, Ventilation and Air Conditioning.