Toyota Diesel 1KZTE OEM Rear Main Oil Seal 90311-95008

Product Overview

Genuine OEM Toyota Rear Main Crankshaft Oil Seal 90311-95008, compatible with Toyota Land Cruiser (70, 80, 100, 105 Series), Land Cruiser Prado (90, 120, 150 Series), Hilux, Hilux Surf, 4Runner, and HiAce models equipped with 1KZ-TE, 1KD-FTV, 2KD-FTV, 1HZ, 1HD-FTE, 1HD-FT, 1HD-T, and 1PZ diesel engines. This crankshaft rear oil seal prevents engine oil from escaping at the rear of the crankshaft, protecting your clutch, flywheel, and transmission from oil contamination. The OEM fluoroelastomer seal delivers superior heat and chemical resistance compared to aftermarket alternatives, making it the definitive choice for long-term reliability in Toyota's legendary diesel platforms.

OEM Part Number(s):

• 90311-95008 (current)
• 90311-95005 (superseded)
• 90080-31100 (superseded)
• 90311-95014 (superseded)
• 90311-95015 (superseded)
• 90311-95061 (superseded)
• 90311-95091 (superseded)

 

Key Features & Benefits

• Stops Rear Main Oil Leaks at the Source: This seal with directional (left-hand) rotation, engineered specifically for Toyota's multi-diesel engine families, eliminates the rear crankshaft oil leaks that contaminate clutches and flywheels
• NOK-Manufactured OEM Quality: Manufactured by NOK, Toyota's OEM seal supplier, with a metal outer casing and Viton rubber sealing lip rated for continuous operating temperatures from -40°F to 400°F (-40°C to 204°C)
• Exact-Fit Dimensions: 95mm ID × 115mm OD × 9.5/12mm width — precisely matched to Toyota crankshaft and rear seal housing specifications across all compatible diesel engine families
• Replaces 7 Superseded Part Numbers: Consolidates legacy part numbers 90311-95005, 90080-31100, 90311-95014, 90311-95015, 90311-95061, and 90311-95091 into one current OEM part
• Economy of Access: Replace this seal during any clutch replacement, flywheel service, or engine rebuild to avoid paying for transmission removal twice. This seal costs a fraction of the labor to access it

 

Technical Specifications

Part Type: Rear Main Crankshaft Oil Seal (Engine Rear Oil Seal)
Toyota Classification: Type T Oil Seal
Material: Viton (FKM) fluoroelastomer lip with metal outer casing
Dimensions: 95mm ID × 115mm OD × 9.5/12mm width
Rotation: Left-hand (LH) directional seal — installation orientation matters
Weight: 0.06 kg (0.13 lbs)
Operating Temperature: -40°F to 400°F (-40°C to 204°C)
Position: Rear of engine block, between crankshaft and flywheel/flexplate
Engine Compatibility: 1KZ-TE, 1KD-FTV, 2KD-FTV, 1HZ, 1HD-FTE, 1HD-FT, 1HD-T, 1PZ
OEM Manufacturer: NOK (Toyota's OEM seal supplier)
Cross Reference: NOK BH4375G, aftermarket BHH1134A; supersedes 90311-95005, 90080-31100, 90311-95014, 90311-95015, 90311-95061, 90311-95091
Speedie Sleeve: If the crankshaft seal surface shows a wear groove, use the speedie sleeve 90311-95010S before installing this seal

 

Fitment

Year	Model	Engine
1993–2002	Land Cruiser 90 Series (KZJ90, KZJ95)	1KZ-TE 3.0L turbo diesel
1996–2009	Land Cruiser Prado 90 Series (KZJ95)	1KZ-TE 3.0L turbo diesel
2002–2009	Land Cruiser Prado 120 Series (KDJ120, KZJ120)	1KD-FTV 3.0L / 1KZ-TE 3.0L turbo diesel
2009–2015	Land Cruiser Prado 150 Series (KDJ150)	1KD-FTV 3.0L turbo diesel
1990–2007	Land Cruiser 70 Series (HZJ70, HZJ73, HZJ75, HZJ78, HZJ79, PZJ70, PZJ73)	1HZ 4.2L / 1PZ 3.5L diesel
1990–2007	Land Cruiser 70 Series (HDJ78, HDJ79)	1HD-FT / 1HD-FTE 4.2L turbo diesel
1990–2007	Land Cruiser 80 Series (HZJ80, HDJ80)	1HZ 4.2L / 1HD-FT 4.2L turbo diesel
1998–2007	Land Cruiser 100 Series (HDJ100)	1HD-FTE 4.2L turbo diesel
1990–2007	Land Cruiser 105 Series (HZJ105)	1HZ 4.2L diesel
1993–2002	4Runner / Hilux Surf (KZN130, KZN185)	1KZ-TE 3.0L turbo diesel
1999–2016	Hilux (KZN165, KUN16, KUN25, KUN26)	1KZ-TE 3.0L / 2KD-FTV 2.5L / 1KD-FTV 3.0L turbo diesel
2005–2013	HiAce (KDH200, KDH201, KDH220–KDH223)	1KD-FTV 3.0L / 2KD-FTV 2.5L turbo diesel

Important: Verify fitment using your vehicle's chassis and engine codes, not the model name alone — Toyota uses the same model names across multiple generations with incompatible parts. This seal is specifically for diesel engine applications listed above; petrol/gasoline engine rear main seals are different parts. Directional rotation must be observed during installation — the seal is left-hand (LH) directional. If your crankshaft shows a wear groove at the seal contact surface, do not install a new seal directly — use speedie sleeve 90311-95010S to restore the sealing surface first.

Installation & Maintenance

Installation Difficulty: Intermediate to Advanced
Tools Required: Transmission jack, socket set, torque wrench, seal driver or suitable driver tool sized to the seal OD, flywheel holding tool, flywheel bolt socket
Professional Installation: Accessing the rear main seal requires transmission removal on most applications; incorrect seal orientation (directional seal) will result in immediate leakage

Maintenance Tips:

• Always replace the rear main seal any time the transmission is removed for clutch replacement or flywheel service. This is the lowest-cost opportunity to address a common diesel leak point
• Inspect the crankshaft seal surface for a wear groove before installing the new seal. If a groove is present, use speedie sleeve 90311-95010S to restore the sealing surface
• Apply a thin film of clean engine oil to the seal lip before installation to prevent dry-start damage during initial engine startup
• Never reuse a rear main seal; once removed, always install a new OEM seal, regardless of the old seal's apparent condition
• Confirm the directional (LH) orientation of the seal during installation — installing a directional seal backward will cause immediate or premature leakage

 

Frequently Asked Questions

Q: What is the 90311-95008, and where is it located on the engine?
A: The 90311-95008 is Toyota's genuine OEM rear main crankshaft oil seal, located at the very rear of the engine block where the crankshaft exits the engine toward the flywheel (manual transmission) or flexplate (automatic transmission). It prevents pressurized engine oil from leaking out past the crankshaft. On Toyota diesel platforms, this seal shares the same 95mm × 115mm × 9.5/12mm specification across multiple engine families, including the 1KZ-TE, 1KD-FTV, 2KD-FTV, 1HZ, 1HD-FTE, 1HD-FT, 1HD-T, and 1PZ.

Q: What's the difference between 90311-95008, 90311-95005, and all the other superseded part numbers?
A: Toyota has released multiple superseding part numbers for this seal over the years: 90311-95005, 90080-31100, 90311-95014, 90311-95015, 90311-95061, and 90311-95091 — as the part number was rationalized across engine families and production runs. The current active part number is 90311-95008, which replaces all of the above. The physical seal specifications remain the same: 95mm ID × 115mm OD × 9.5/12mm width, Viton lip, LH rotation, NOK-manufactured.

Q: Is this seal compatible with both 1KZ-TE and 1KD-FTV engines?
A: Yes. The 90311-95008 is the correct rear main crankshaft seal for both the 1KZ-TE (3.0L indirect injection turbo diesel) and the 1KD-FTV (3.0L common rail direct injection turbo diesel), as well as the 2KD-FTV (2.5L common rail). It is also used across the older 1HZ, 1HD-FT, 1HD-FTE, and 1PZ Land Cruiser diesel engines. Always verify against your specific chassis code and engine code before ordering.

Q: How difficult is it to replace the rear main seal on a 1KZ-TE or 1HD engine?
A: Replacing the rear main seal on these engines requires removing the transmission to access the flywheel and rear seal housing.  This is a 4–10-hour job depending on the vehicle, drivetrain configuration (2WD vs 4WD), and shop experience. The seal replacement itself takes minutes once access is gained; the labor is entirely in transmission removal and reinstallation. This is why replacing the seal during any scheduled clutch or flywheel service is strongly recommended.  The access cost has already been paid.

Q: What does a failing rear main seal look like?
A: The most common sign is an oil leak originating from the bell housing area between the engine and transmission. Oil typically drips from the bottom of the bell housing and, in more advanced cases, coats the clutch housing, flywheel, and transmission front. Oil contamination on the clutch disc causes slipping and premature clutch failure. Identifying the leak source correctly matters.  An oil leak at the rear of the engine can also originate from the oil pan rear gasket or cam cover, so confirming the source before transmission removal is advisable.

Related Toyota Parts You May Need

• Clutch Kit — Economical to replace during any transmission removal job; inspect clutch disc, pressure plate, and release bearing while access is open
• Flywheel / Ring Gear — Inspect flywheel friction surface and ring gear for wear during rear seal service; resurfacing or replacement is cost-effective with transmission already removed
• Front Crankshaft Oil Seal (90311-50017 for 1KZ-TE) — Replace the front crankshaft seal during any major diesel engine service to eliminate future oil leaks at the timing cover
• Camshaft Seal 90311-32020 — Replace during timing belt service on 1KZ-TE and other belt-driven diesel engines to prevent oil migration into the timing belt cavity
• Timing Belt Kit — If accessing the front of the engine during the same service, replace the timing belt, tensioner, and idler as a preventive package

 

Common Symptoms of Rear Main Seal Failure

• Oil dripping or pooling from the bottom of the bell housing between the engine and the transmission
• Oil coating on the flywheel, clutch housing, or visible on the transmission front face
• Clutch slipping or burning smell — an oil-contaminated clutch disc cannot grip properly
• Oil level dropping without any visible external leaks on the top or front of the engine
• Oil on the underside of the vehicle is concentrated at the rear of the engine/front of the transmission

 

Why Choose Genuine OEM Toyota 90311-95008

The Viton Advantage Over Cheap Aftermarket Seals: Toyota's diesel engines run hot, run hard, and run for hundreds of thousands of kilometers when properly maintained. The genuine 90311-95008, manufactured by NOK, Toyota's OEM seal supplier, uses Viton (FKM) fluoroelastomer rather than the standard nitrile (NBR) rubber found in most aftermarket alternatives. Viton outperforms nitrile in resistance to engine oil, heat, and chemical degradation, making it the OEM choice for these high-temperature diesel applications. A low-cost aftermarket seal that hardens or shrinks prematurely means paying for transmission removal again, a cost that dwarfs the price difference between genuine and aftermarket.

Directional Seals Require Exact Specifications: The 90311-95008 is a left-hand (LH) directional rotary seal — the hydrodynamic lip geometry is engineered to pump oil back into the engine as the crankshaft rotates. An aftermarket replacement that ignores directional rotation or is made to imprecise dimensions will leak or fail early. The genuine NOK-manufactured seal is dimensionally correct and directionally accurate for Toyota's diesel crankshaft specifications.

Replacing the rear main seal is one of the more labor-intensive diesel maintenance tasks on these platforms. When you're already paying for transmission removal, the cost of the seal itself is the smallest variable — the only rational choice is a genuine OEM seal. Don't compromise your clutch, flywheel, or the hours of labor required to access them with a $5 aftermarket seal. Install the correct genuine Toyota 90311-95008 and move on with confidence.