John Deere 9.0 L Diesel Engines — Crankshaft Rear Oil Seal & Oil Seal Housing — Installation
Repair & overhaul
For the John Deere 9.0 L Diesel Engines, from the John Deere service manual.
Applies to: John Deere 6090H engine
Before you start
- Handle seal and wear sleeve assembly carefully; DO NOT SEPARATE. No lubricant of any kind is to contact seal when installing.
- When installing the JDG478 Driver, locate crossbar at right angle (90°) to Allen head cap screws.
- Unitized seal assembly must be installed in correct orientation; seal is stamped 'this side out' on rear, or outward, side of seal.
Procedure
- Clean cylinder block mounting surface for rear oil seal housing.
- Using a dowel pin driver, install oil seal housing dowel pins in cylinder block at 3:00 and 9:00 positions; drive to specified protrusion.
- Install gasket over dowel pins.
- Align rear oil seal housing to dowel pins and gasket; slide into position against block face.
- Apply thread sealant to threads of 6 socket head cap screws; install finger tight through housing to block.
- Torque cap screws to specification in the sequence shown.
- Trim the housing gasket flush with the bottom of the housing; discard gasket remnant.
- Install JDG477 (85) Pilot on end of crankshaft using the Allen head cap screws; tighten securely.
- Start oil seal/wear sleeve assembly over pilot and crankshaft with open side of seal toward engine.
- Position JDG478 Driver so hole in cross plate goes over threaded stud of pilot; install washer and nut.
- Tighten nut to draw driver in until crossbar bottoms on pilot; seal and wear ring assembly correctly positioned.
- Remove JDG476 (85) Tool Set from engine.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Dowel pin to rear cylinder block face protrusion 6.5 mm (0.25 in.)
- -6- Cap Screws — Oil Seal Housing to Cylinder Block 37 N·m (27 lb-ft)
- Outside edge of seal to flange face of crank maximum distance 14.6 mm (0.578 in.)
Full service-parts list: John Deere 6090H engine →
Source: John Deere service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.