Oil Pan Replacement

This procedure covers removal and replacement of the engine oil pan on a 2007 Ram 3500 with the 5.9L Cummins diesel engine, including draining oil, removing the pan, cleaning surfaces, and reinstalling with new gasket.

Warnings

Tools required

Parts

• Oil pan gasket × 1 — Use OEM Cummins specification
• Oil pan drain plug washer × 1 — Copper or aluminum crush washer
• Oil pan bolts (if damaged or corroded) × 1 — Use OEM specification

Fluids

• 15W-40 diesel oil or 5W-40 synthetic — 12 qt

Preparation

1. Park vehicle on level concrete surface and apply parking brake firmly
2. Place wheel chocks behind rear wheels
3. Allow engine to cool completely if recently operated (minimum 2 hours)
4. Disconnect negative battery cable to prevent accidental starter engagement
5. Raise front of vehicle with floor jack and support securely on jack stands at frame rails
6. Remove front skid plate or under-engine protective covers if equipped
7. Position oil drain pan under engine oil drain plug

Procedure

1. 1

   Drain engine oil
   Remove the oil drain plug from the oil pan using appropriate socket. Allow all oil to drain completely into drain pan (this will take 15-20 minutes for full drainage). Inspect drain plug threads and replace crush washer.
2. 2

   Remove oil filter
   Remove the oil filter to allow additional oil to drain from the block and improve access. Be prepared for additional oil spillage. Discard used filter properly.
3. 3

   Support front axle assembly
   Position a transmission jack or heavy-duty scissors jack under the front differential to support the front axle assembly. Raise jack until it makes contact but does not lift the axle.
4. 4

   Remove front axle mounting hardware
   Following the factory service manual procedure, disconnect and lower the front axle/differential as required to provide clearance for oil pan removal. Note this is a solid front axle vehicle (no CV axles). Do not disconnect steering linkage unless specified. Verify all mounting fastener locations and counts in the FSM.
5. 5

   Support engine for oil pan removal
   Place a transmission jack or engine support under the engine oil pan with a wood block to protect the pan. Carefully lift engine approximately 1 inch to relieve tension on motor mounts. Monitor fan-to-radiator clearance and all hoses/wiring.
6. 6

   Remove oil pan bolts
   Remove all oil pan mounting bolts in a crisscross pattern starting from the outside working inward. Remove all oil pan mounting bolts around the perimeter of the pan (verify exact count in the factory service manual for the 5.9L Cummins). Keep bolts organized by location as some may be different lengths. Note that some bolts may be difficult to access near the bellhousing.
7. 7

   Separate and remove oil pan
   Carefully break the gasket seal using a plastic gasket scraper or pry bar at designated pry points. Do not pry between machined sealing surfaces. Gently work the pan loose while supporting its weight. Lower the pan carefully, being mindful of residual oil. Maneuver the pan forward and down between the front axle and crossmember to remove.
8. 8

   Clean oil pan and block sealing surfaces
   Thoroughly clean all old gasket material from both the oil pan and engine block sealing surfaces using plastic scrapers and razor blades held flat. Remove all traces of old RTV or gasket material. Clean surfaces with brake cleaner and wipe dry with lint-free shop rags. Inspect oil pan for cracks, warping, or damage. Check pickup tube is secure and screen is clean.
9. 9

   Install new oil pan gasket
   Position the new oil pan gasket on the oil pan, aligning all bolt holes. Some gaskets may require a thin bead of RTV silicone at the front and rear corners where the block meets the timing cover and rear seal housing. Follow gasket manufacturer instructions. Allow RTV to tack up for 5-10 minutes if used.
10. 10

    Install oil pan to engine block
    Carefully maneuver the oil pan with gasket up between the axle and crossmember, then raise into position against the engine block. Ensure gasket remains properly aligned. Start all oil pan bolts by hand, threading each 2-3 turns before proceeding to ensure proper alignment.
11. 11

    Torque oil pan bolts
    Tighten oil pan bolts in a crisscross pattern from the center outward in multiple passes. Since specific torque values are not provided in the database, consult factory service manual for proper specification (Cummins 5.9L ISB oil pan bolts are approximately M8 fasteners; verify exact torque in Cummins/Mopar documentation before tightening). Do not overtighten as this can warp the pan and cause leaks.
12. 12

    Lower engine and reinstall axle mounts
    Carefully lower the engine back to its normal position. Raise the front axle assembly back into position and reinstall all mounting bolts. Torque axle mounting bolts to specification (consult service manual, typically 100+ ft-lbs for these fasteners). Remove transmission jack from under axle.
13. 13

    Install drain plug and oil filter
    Install oil drain plug with new crush washer and tighten to specification (approximately 37 ft-lbs for the 5.9L Cummins; verify in service manual). Install a new oil filter, lubricating the gasket with clean oil and tightening per filter manufacturer instructions (typically 3/4 turn after gasket contact).
14. 14

    Refill with engine oil
    Add approximately 12 quarts of 15W-40 or 5W-40 synthetic diesel oil (meeting Cummins CES 20081 / API CJ-4) through the oil fill cap (verify exact capacity in owner's manual). Use a funnel to avoid spillage. After adding oil, allow 5 minutes for oil to settle into pan before checking level.
15. 15

    Initial start and leak inspection
    Reconnect negative battery cable. Start engine and allow to idle. Immediately check for leaks around oil pan gasket and drain plug. Monitor oil pressure gauge to confirm normal pressure. Run engine for 2-3 minutes, then shut off and allow 5 minutes for oil to drain back to pan. Recheck oil level and add if necessary to reach full mark on dipstick.

Reassembly

1. Reinstall front skid plate or under-engine protective covers if equipped
2. Lower vehicle from jack stands
3. Dispose of used oil and filter at appropriate recycling facility
4. Reset oil life monitor if equipped

Verification

• Start engine and verify normal oil pressure within 2-3 seconds of startup
• Run engine at idle for 10 minutes and monitor for leaks around oil pan perimeter and drain plug
• Check oil level on dipstick after engine has been off for 10 minutes - adjust to full mark if needed
• Take vehicle for short test drive, then recheck for leaks with engine warm
• Perform final inspection after 24 hours and after first 100 miles of operation

More procedures for this vehicle