This procedure involves removing the transmission to replace the rear main crankshaft seal, preventing oil leaks from the rear of the engine. Requires transmission removal and careful seal installation.

Warnings

Tools required

Parts

• Rear main crankshaft seal × 1 — Use OEM specification
• Engine oil drain plug crush washer × 1 — Use OEM specification
• Transmission fluid × 1 — Hyundai SP-IV-M ATF
• Rear main seal housing gasket or RTV sealant × 1 — Use OEM specification

Fluids

• Hyundai Genuine 0W-20 — 5 qt
• Hyundai SP-IV-M ATF — 10 qt

Preparation

1. Park vehicle on level surface and engage parking brake
2. Disconnect negative battery cable and secure away from terminal
3. Raise vehicle and support securely on jack stands at all four corners
4. Remove engine splash shield and belly pans
5. Drain engine oil completely and install drain plug with new crush washer
6. Drain transmission fluid by removing drain plug or pan
7. Remove front wheels if additional access is needed
8. Install engine support bar across engine bay or attach engine hoist to support engine weight

Procedure

1. 1

   Remove exhaust system components
   Disconnect exhaust pipe from manifold or catalytic converter. Remove exhaust hangers and lower front exhaust section to provide clearance for transmission removal. May require removing heat shields.
2. 2

   Disconnect driveline components
   Mark orientation of front and rear driveshafts for reassembly. Remove front driveshaft from transfer case and rear driveshaft from differential. Remove transfer case if necessary for clearance. Support driveshafts and secure out of the way.
3. 3

   Disconnect transmission electrical and cooling connections
   Disconnect all electrical connectors from transmission including shift solenoids, speed sensors, and range sensor. Disconnect transmission cooler lines and plug or cap to prevent fluid loss and contamination. Label all connections for reassembly.
   ⚠Residual transmission fluid will drain from cooler lines. Have drain pan ready.
4. 4

   Remove transmission mounting and crossmember
   Support transmission securely with transmission jack. Remove transmission mount bolts and crossmember mounting bolts. Lower crossmember and remove from vehicle. Ensure transmission is fully supported before proceeding.
   ⚠️Transmission must be fully supported on jack before removing mounts. Verify jack is centered and secure.
   Torque spec

   Mounting Bolts47 Nm (35 lb-ft)
5. 5

   Access starter and remove
   Disconnect starter electrical connections. Remove starter mounting bolts and extract starter motor from bell housing. This provides access to lower transmission-to-engine bolts.
6. 6

   Remove transmission-to-engine bolts
   Remove all transmission-to-engine bell housing bolts. There are typically 6-8 bolts of varying lengths around the perimeter. Note bolt locations as lengths differ. Ensure transmission jack is supporting full weight before removing final bolts.
   Torque spec

   Transmission-to-Engine Bolts55 Nm (41 lb-ft)
7. 7

   Separate and remove transmission
   Carefully slide transmission rearward away from engine, keeping it level to avoid binding on input shaft or damaging torque converter. Once input shaft clears engine, lower transmission on jack and remove from under vehicle. Be prepared for residual fluid spillage.
   ⚠Do not allow transmission weight to hang on input shaft. Keep transmission supported and level during removal.
8. 8

   Remove flexplate
   Use a flywheel holding tool or wedge to prevent crankshaft rotation. Remove all flexplate-to-crankshaft bolts in a star pattern. Remove flexplate and inspect for cracks or damage. Clean crankshaft flange thoroughly.
   ℹ️Mark flexplate orientation to crankshaft before removal to maintain balance during reassembly.
   Torque spec

   Flexplate Bolts85 Nm (63 lb-ft)
9. 9

   Remove rear main seal housing
   Remove all rear main seal housing bolts. Carefully pry housing away from engine block using plastic pry tools at designated pry points. Do not damage sealing surfaces on block or housing. Remove old gasket material completely.
   Torque spec

   Rear Main Seal Housing12 Nm (9 lb-ft)
10. 10

    Remove old rear main seal
    Using a seal puller or carefully with a pry bar, remove the old rear main seal from the housing. Note the orientation and depth of the original seal. Clean the seal bore completely, removing all old seal material and debris. Inspect housing for cracks or damage.
11. 11

    Install new rear main seal
    Lightly coat new seal outer diameter with clean engine oil. Verify seal orientation with lip facing toward engine. Using a seal driver or large socket matching seal outer diameter, drive seal squarely into housing until fully seated and flush with housing surface. Ensure seal is not cocked or damaged during installation.
    ⚠Seal must be installed perfectly square to prevent leaks. Any cocking or misalignment will cause immediate failure.
12. 12

    Install rear main seal housing
    Apply new gasket or thin bead of RTV sealant to housing mating surface per manufacturer specification. Carefully align housing onto engine block, ensuring seal lip does not fold or damage on crankshaft. Install all housing bolts finger-tight, then torque in a crossing pattern to specification.
    ⚠Lightly oil crankshaft surface where seal contacts to prevent seal lip damage during installation.
    Torque spec

    Rear Main Seal Housing12 Nm (9 lb-ft)
13. 13

    Reinstall flexplate
    Align flexplate to crankshaft using alignment marks made during removal. Install all flexplate bolts and tighten in a star pattern to specification. Verify flexplate is fully seated against crankshaft flange.
    ℹ️Flexplate bolts must be tightened in star pattern to ensure even clamping and prevent warping.
    Torque spec

    Flexplate Bolts85 Nm (63 lb-ft)
14. 14

    Reinstall transmission
    Raise transmission into position on transmission jack. Carefully align input shaft with torque converter or pilot bearing. Slide transmission forward, ensuring alignment dowels engage properly. Install all transmission-to-engine bolts and torque to specification in a crossing pattern.
    ⚠Never force transmission into position. If resistance is felt, lower and realign. Forcing can damage input shaft or seal.
    Torque spec

    Transmission-to-Engine Bolts55 Nm (41 lb-ft)
15. 15

    Reinstall remaining components
    Reinstall starter motor and electrical connections. Install transmission crossmember and mounts, torquing all mounting bolts to specification. Reconnect transmission cooler lines and all electrical connectors. Reinstall driveshafts in original orientation. Reinstall exhaust components and heat shields. Reinstall splash shields and wheels if removed.
    Torque spec

    Mounting Bolts47 Nm (35 lb-ft)

Reassembly

1. Fill engine with specified 5 quarts of Hyundai Genuine 0W-20 engine oil
2. Fill transmission with approximately 10 quarts of Hyundai SP-IV-M ATF, checking level per manufacturer procedure
3. Refill transfer case with 2.5 quarts of transfer case fluid if removed
4. Reconnect negative battery cable
5. Double-check all bolt torques, especially transmission-to-engine and flexplate bolts

Verification

• Start engine and verify no oil leaks from rear main seal area
• Check transmission fluid level with engine at operating temperature and adjust as needed
• Test drive vehicle through all gears and verify proper transmission operation
• Recheck for leaks after test drive, inspecting rear main seal area and all connections
• Monitor oil level over next few days to confirm seal is not leaking

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