Engine Mounts - All

Complete replacement of all engine mounts on the 2007 Ram 3500 with 5.9L Cummins diesel engine, including left and right motor mounts and front support mount.

Warnings

Tools required

Parts

• Left engine mount assembly × 1 — OEM 52122730AC or equivalent
• Right engine mount assembly × 1 — OEM 52122731AC or equivalent
• Front engine mount assembly × 1 — OEM 52122732AA or equivalent

Preparation

1. Park vehicle on level, solid surface and engage parking brake
2. Disconnect both battery cables, negative terminal first
3. Remove engine cover and any shrouding that restricts access to engine mounts
4. Raise and support vehicle securely on jack stands at frame rails
5. Remove front skid plate if equipped
6. Inspect all three engine mounts to identify which mounts require replacement
7. Apply penetrating oil to all engine mount fasteners and allow to soak
8. Position floor jack under engine oil pan with wood block to distribute load evenly

Procedure

1. 1

   Support engine weight
   Using the floor jack positioned under the oil pan with wood block, carefully raise engine just enough to take weight off mounts (approximately 1/8 to 1/4 inch). Monitor fan clearance to radiator shroud. Alternatively, install engine support fixture across fender rails with chain or strap supporting engine from lifting eyes. The engine should be supported but not lifted significantly from its normal position.
2. 2

   Remove driver side mount
   From underneath vehicle, locate left engine mount between engine block and frame rail. Remove lower through-bolt securing mount to frame bracket. Remove upper mounting bolts securing mount to engine block. Verify fastener sizes and count against the factory service manual before beginning. Carefully raise engine slightly if needed to relieve tension on mount. Remove old mount from between engine and frame. Note orientation and positioning for installation.
3. 3

   Install new driver side mount
   Position new left engine mount between engine block and frame bracket, ensuring proper orientation matches factory position. Install upper bolts hand-tight first to align mount to engine block. Lower engine carefully onto mount while guiding through-bolt into position. Install through-bolt and nut hand-tight. Torque upper mounting bolts to specification, then torque lower through-bolt to specification per factory service manual.
4. 4

   Remove passenger side mount
   From underneath vehicle, locate right engine mount between engine block and frame rail. This mount may be more difficult to access due to exhaust routing. Remove lower through-bolt securing mount to frame bracket. Remove upper mounting bolts securing mount to engine block. Carefully raise engine slightly if needed to relieve tension. Remove old mount, noting any shims or spacers that may be present.
5. 5

   Install new passenger side mount
   Position new right engine mount between engine block and frame bracket with correct orientation. Reinstall any shims or spacers in original locations. Install upper bolts hand-tight to engine block. Lower engine onto mount while aligning through-bolt location. Install through-bolt and nut hand-tight. Torque upper mounting bolts to specification, then torque lower through-bolt to specification per factory service manual.
6. 6

   Access front engine mount
   The front mount is located at the front of the engine block, typically supporting the front timing cover area. Access is from underneath vehicle. You may need to remove or loosen accessory drive components or brackets for clearance. The mount connects the front of the engine to a crossmember or frame bracket.
7. 7

   Remove front engine mount
   Support front of engine with floor jack if needed to relieve weight on front mount. Remove through-bolt or mounting bolts securing mount to frame bracket (orientation varies by specific application). Remove bolts securing mount to engine block or timing cover. Extract old mount from mounting position. Clean mounting surfaces on both engine and frame with wire brush.
8. 8

   Install new front engine mount
   Position new front mount in correct orientation between engine and frame bracket. Install mounting bolts to engine block hand-tight. Install through-bolt or frame mounting bolts hand-tight. Ensure mount is properly seated and aligned. Torque all fasteners to specification per factory service manual, starting with engine-side bolts then frame-side fasteners.
9. 9

   Final torque verification
   With all three mounts installed, verify engine is sitting level and in proper position. Check that all mount fasteners are torqued to specification. Ensure no wiring, hoses, or cables are pinched or under tension due to engine position. Remove engine support jack or fixture slowly while monitoring engine position and mount engagement.
10. 10

    Reinstall removed components
    Reinstall front skid plate if equipped. Reinstall any brackets, shrouding, or accessory components removed for access. Reinstall engine cover. Lower vehicle from jack stands. Reconnect battery cables, positive terminal first, then negative.

Reassembly

1. Ensure all mount fasteners are torqued to factory specifications using a calibrated torque wrench
2. Verify no interference exists between engine and any surrounding components in the new mount position
3. Double-check that all electrical connections, hoses, and cables have proper clearance and are not stressed

Verification

• Start engine and observe for excessive vibration or unusual movement
• With engine running, have assistant shift transmission through all gears while observing engine movement (should be minimal)
• Test drive vehicle and note any unusual vibrations, particularly during acceleration and deceleration
• Perform visual inspection of all three mounts after test drive to verify proper seating and no fastener loosening
• Re-torque all mount fasteners after 50-100 miles of operation as final verification

Related trouble codes on this vehicle

Codes that commonly send this job to the bay — tap one for symptoms, causes, and diagnostic steps.

Chasing one of these codes and not sure which part is guilty? Ask a master mechanic about YOUR car →

More procedures for this vehicle