Engine Mount Replacement for Chevrolet Chevy P42 Commercial Chassis 1999

Engine Mount Replacement Front

Notice: 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.

1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.




Notice: When raising or supporting the engine for any reason, do not use a jack under the oil pan, any sheet metal, or the crankshaft pulley. Lifting the engine in an unapproved manner may cause component damage.

2. Using a jack on the square tab (left side shown) at the rear of the engine block, raise the engine. In order to access the square tab on the right side remove the starter motor. Refer to Starter Motor Replacement in Engine Electrical.



3. Remove the engine mount bolt and nut for the side being replaced.
4. Raise and support the engine enough to remove the engine mount.
5. Remove the engine mount to engine mount bracket bolts, (through-bolt), and nuts.
6. Remove the engine mount.



7. Remove the engine mount bolts to the engine.
8. Remove the engine mount bracket and the engine mount.

1. Install the engine mount bracket, the engine mount, and one engine mount bolt to the engine.

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.

2. Install the remaining engine mount bolts to the engine.

Tighten
Tighten the bolts to 47 N·m (35 lb ft).

3. Install the engine mount to the engine mount bracket.
4. Install the engine mount to engine mount bracket bolts and nuts.

Tighten
Tighten the nuts to 41 N·m (30 lb ft).

5. Lower the engine.



6. Install the engine mount (through-bolt) and nut.

Tighten
Tighten the nut to 56 N·m (41 lb ft).

7. Lower the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.