Oil Pan (Upper and Lower) Explanation

OIL PAN DESCRIPTION
There is an upper and lower oil pan. The upper oil pan is cast aluminum and also serves as the engine lower end structural support. The lower pan is a stamped steel design. Both upper and lower oil pans are sealed using Mopar® Threebond Engine RTV Sealant.

CAUTION: Do not attempt to support the weight of the engine on the windage tray. The windage tray is a thin cast aluminum construction and can be easily damaged.

The high pressure die cast aluminum windage tray is mounted to the main bearing caps and is designed to keep oil off of the connecting rods as the crankshaft rotates. When the oil is kept off the connecting rods, the engine rotates easier and oil foaming decreases. Like the oil pan, the windage tray is designed to stiffen the lower end of the engine. The tray is directional and the main bearing cap bolts hold it in place.

LOWER OIL PAN REMOVAL
1. Raise and support the vehicle. Refer to HOISTING, STANDARD PROCEDURE
2. Drain the engine oil. Refer to STANDARD PROCEDURE
3. Remove twelve bolts (Fig 3) #4, two nuts (Fig 3) #3 and two studs (Fig 3) #2 from the flange of the lower oil pan (Fig 3) #1.
CAUTION: Do not pry on the lower oil pan flange. There are no designated pry points for lower oil pan removal. Prying on only one or a few locations could bend the flange and damage the pan.
4. Using a gasket scraper or equivalent, loosen the seal around the lower oil pan in order to shear the sealant bond and remove the pan.
5. Remove all residual sealant from the upper and lower oil pans and clean the mating surfaces with isopropyl alcohol in preparation for sealant application. Refer to CLEANING .

LOWER OIL PAN INSTALLATION
1. Clean the upper and lower oil pan mating surfaces with isopropyl alcohol in preparation for sealant application. Refer to CLEANING .
CAUTION: Engine assembly requires the use of a unique sealant that is compatible withengine oil. Using a sealant other than Mopar® Threebond Engine RTV Sealant may result in engine fluid leakage.
CAUTION: Following the application of Mopar® Threebond Engine RTV Sealant to the gasket surfaces, the components must be assembled within 20 minutes and the attaching fasteners must be tightened to specification within 45 minutes. Prolonged exposure to the air prior to assembly may result in engine fluid leakage.
2. Apply a 2 to 3 mm wide bead of Mopar® Threebond Engine RTV Sealant (Fig 12) #1 to the lower oil pan as shown in illustration.
3. Install two studs (Fig 3) #2 into the upper oil pan flange.
4. Install the lower oil pan (Fig 3) #1 to the upper oil pan with twelve bolts (Fig 3) #4 and two nuts (Fig 3) #3 tightened to 11 N.m (97 in. lbs.).
CAUTION: Following assembly, the Mopar® Threebond Engine RTV Sealant must be allowed to dry for 45 minutes prior to adding oil and engine operation. Premature exposure to oil prior to drying may result in engine fluid leakage.
5. If removed, install the oil filter and fill the engine crankcase with the proper oil to the correct level. Refer to STANDARD PROCEDURE .
6. Start and run the engine until it reaches normal operating temperature.

UPPER OIL PAN REMOVAL
1. Remove the engine cover, if equipped.
2. Raise and support the vehicle. Refer to HOISTING, STANDARD PROCEDURE
3. Remove the right front wheelhouse inner splash shield. Refer to SHIELD, SPLASH, WHEELHOUSE, REMOVAL
4. Remove the bolt (Fig 4) #2 and remove the oil level indicator (Fig 4) #1.
5. Drain the engine oil. Refer to STANDARD PROCEDURE
NOTE: The lower oil pan (Fig 3) #1 does not need to be removed when removing the upper oil pan.
6. If required, remove the lower oil pan (Fig 3) #1. Refer to PAN, OIL, REMOVAL
7. Remove the two nuts (Fig 5) #1 and the exhaust hanger bracket (Fig 5) #7.
8. Disengage the transmission cooler line retainer (Fig 6) #1 from the oil
9. Remove four transmission to the engine oil pan bolts (Fig 7) #2 and #3.
10. Remove two rubber plugs (Fig 7) #1 covering the rear oil seal retainer flange bolts.
11. Remove two M6 bolts (Fig 8) #1 from the rear oil seal retainer flange.
NOTE: Shown in illustration with transmission removed for clarity.
CAUTION: There are two hidden M6 bolts that must be removed from the rear of the upper oil pan flange. If these bolts are not removed, the rear oil seal retainer flange will beseverely damaged.
12. Remove nineteen M8 oil pan mounting bolts (Fig 9) #1.
NOTE: Grand Cherokee (WK) oil pan shown in illustration, Wrangler (JK) oil pan similar.
13. Using the four indicated pry points (Fig 10), carefully remove the upper oil pan.
14. Remove all residual sealant from the upper and lower oil pans, timing chain cover, rear seal retainer and engine block mating surfaces. Refer to CLEANING

UPPER OIL PAN INSTALLATION
NOTE: Grand Cherokee (WK) oil pan shown in illustration, Wrangler (JK) oil pan similar.
CAUTION: Engine assembly requires the use of a unique sealant that is compatible with engine oil. Using a sealant other than Mopar® Threebond Engine RTV Sealant may result in engine fluid leakage.
CAUTION: Clean the upper and lower oil pans, timing chain cover, rear seal retainer and engine block mating surfaces thoroughly with isopropyl alcohol in preparation for sealant application. All surfaces that seal with RTV must be oil and contamination free to ensure proper adhesion of the RTV to the mating surface to prevent leaks.

CAUTION: Following the application of Mopar® Threebond Engine RTV Sealant to the gasket surfaces, the components must be assembled within 20 minutes and the attaching fasteners must be tightened to specification within 45 minutes. Prolonged exposure to the air prior to assembly may result in engine fluid leakage.
1. Clean the upper and lower oil pans, timing chain cover, rear seal retainer and engine block mating surfaces with isopropyl alcohol in preparation for sealant application. Refer to CLEANING .
2. Apply a 2 to 3 mm wide bead of Mopar® Threebond Engine RTV Sealant to the upper oil pan as shown in illustration in the following locations:
a. Oil pan to engine block flange (Fig 11) #1
b. Two timing cover to engine block T-joints (Fig 11) #2
c. Two rear seal retainer to engine block T-joints (Fig 11) #3
CAUTION: Make sure that the rear face of the oil pan is flush to the transmission bell housing before tightening any of the oil pan mounting bolts. A gap between the oil pan and the transmission could crack the oil pan or transmission casting.
3. Install the oil pan to the engine block and flush to the transmission bell housing. Secure the oil pan to the engine block with nineteen M8 oil pan mounting bolts (Fig 9) #1 finger tight.
4. Install four transmission to the engine oil pan bolts (Fig 7) #2 and #3 and tighten to 55 N.m (41 ft. lbs.).
5. Tighten the nineteen previously installed M8 oil pan mounting bolts (Fig 9) #1 to 25 N.m (18 ft. lbs.).
NOTE: Shown in illustration with transmission removed for clarity.
6. Install two M6 bolts (Fig 8) #1 to the rear oil seal retainer flange and tighten to 10 N.m (89 in. lbs.).
7. Install two rubber plugs (Fig 7) #1 covering the rear oil seal retainer flange bolts.
8. Engage the transmission cooler line retainer (Fig 6) #1 to the oil pan flange.
9. Remove the two nuts (Fig 5) #1 and the exhaust hanger bracket (Fig 5) #7.
10. If removed, install the lower oil pan. Refer to PAN, OIL, INSTALLATION .
11. Install the oil level indicator (Fig 4) #1 with bolt (Fig 4) #2 tightened to 12 N.m (106 in. lbs.).
12. Install the right front wheelhouse inner splash shield. Refer to SHIELD, SPLASH, WHEELHOUSE, INSTALLATION .
13. Lower the vehicle.
14. If removed, install the oil filter and fill the engine crankcase with the proper oil to the correct level. Refer to STANDARD PROCEDURE .
15. Install the engine cover, if equipped.
16. Connect the negative battery cable.
17. Start and run the engine until it reaches normal operating temperature.

OIL PAN CLEANING
CAUTION: Clean the upper and lower oil pans, timing chain cover, rear seal retainer and engine block mating surfaces thoroughly with isopropyl alcohol in preparation for sealant application. All surfaces that seal with RTV must be oil and contamination free to ensure proper adhesion of the RTV to the mating surface to prevent leaks
1. Clean the oil pan in solvent and wipe dry with a clean cloth.
CAUTION: Do not use oil based liquids, wire brushes, abrasive wheels or metal scrapers to clean the engine gasket surfaces. Use only isopropyl (rubbing) alcohol, along with plastic or wooden scrapers. Improper gasket surface preparation may result in engine fluid leakage.
2. Remove all residual sealant (Fig 12) #1 from the upper and lower oil pans. Refer to ENGINE GASKET SURFACE PREPARATION .
NOTE: Grand Cherokee (WK) upper oil pan shown in illustration, Wrangler (JK) upper oil pan similar.