If you own a Lexus IS300 long enough, eventually you end up searching one of three things:

• “2JZ torque specs”
• “why is my IS300 leaking oil”
• “how bad is rod knock really”

This guide focuses on the first one before it becomes the third one.

Proper torque specs matter on the 2JZ-GE because Toyota engineered this engine with extremely tight tolerances, aluminum components, and enough long-term reliability to accidentally create one of the most respected inline-six engines ever built.

Improper torque can cause:

• oil leaks
• warped components
• stripped threads
• broken bolts
• vacuum leaks
• bearing damage
• catastrophic engine failure

Or as Facebook Marketplace sellers call it:

“Runs great just needs tune.”

This article compiles factory Lexus IS300 and 2JZ-GE torque specifications in BOTH metric and standard measurements directly from the Lexus factory service manual.

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Lexus IS300 Engine Torque Specs

Timing Belt & Front Engine Torque Specs

Component	Metric	Standard
Crankshaft Pulley Bolt	330 N·m	243 ft-lb
Camshaft Timing Pulley	81 N·m	60 ft-lb
Timing Belt Tensioner	27 N·m	20 ft-lb
Idler Pulley	35 N·m	26 ft-lb
Timing Belt Cover Bolts	8.0 N·m	71 in-lb

The crank pulley bolt is notoriously tight from the factory.

If your breaker bar bends enough to make you reconsider your life choices, you’re probably doing it correctly.

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Cylinder Head Torque Specs

Component	Metric	Standard
Cylinder Head Bolts Stage 1	35 N·m	26 ft-lb
Cylinder Head Bolts Stage 2	Turn 90°	Turn 90°
Cylinder Head Bolts Stage 3	Turn 90°	Turn 90°
Camshaft Bearing Caps	20 N·m	14 ft-lb
Valve Cover Bolts	8.5 N·m	75 in-lb

The 2JZ head bolt torque sequence is critical. Uneven torque can cause:

• head gasket leaks
• coolant intrusion
• compression loss
• sadness

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Intake & Exhaust Torque Specs

Component	Metric	Standard
Intake Manifold	28 N·m	21 ft-lb
Exhaust Manifold	40 N·m	30 ft-lb
Front Exhaust Pipe	43 N·m	32 ft-lb
Heated O2 Sensor	45 N·m	33 ft-lb

Exhaust studs on older IS300s are often fused together through heat, corrosion, and pure hatred.

Use anti-seize.
Future-you deserves happiness.

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Cooling System Torque Specs

Component	Metric	Standard
Water Pump	21 N·m	15 ft-lb
Water Pump Pulley	14 N·m	10 ft-lb
Engine Drain Plug	30 N·m	22 ft-lb
Water Inlet	9.0 N·m	80 in-lb
Electric Cooling Fan	5.0 N·m	44 in-lb

Over-tightening water pump bolts into aluminum is a classic “I watched one YouTube video and now I’m ASE certified” moment.

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Oil System Torque Specs

Component	Metric	Standard
Oil Drain Plug	38 N·m	28 ft-lb
Oil Pump	21 N·m	15 ft-lb
Oil Filter Bracket	90 N·m	66 ft-lb
Oil Pressure Switch	15 N·m	11 ft-lb
Crank Position Sensor	9.0 N·m	80 in-lb

The IS300 oil pan bolts are low torque for a reason.

These are not lug nuts.
Do not attack them with a half-inch impact gun set to “industrial earthquake.”

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Fuel System & Intake Torque Specs

Component	Metric	Standard
Fuel Line Union Bolt	29 N·m	22 ft-lb
Delivery Pipe	21 N·m	15 ft-lb
Fuel Tank Band	39 N·m	29 ft-lb
Throttle Body Bracket	21 N·m	15 ft-lb
MAF Sensor	10.7 N·m	8 ft-lb

The factory MAF sensor torque spec being included is peak Toyota engineering energy.

Nothing is left to chance.

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Ignition & Charging Torque Specs

Component	Metric	Standard
Generator to Block	40 N·m	30 ft-lb
Generator Pulley Nut	110.5 N·m	81 ft-lb
Starter to Transmission	37 N·m	27 ft-lb
Starter Terminal Nut	17 N·m	13 ft-lb

Loose starter connections on an IS300 can create enough electrical chaos to make you suspect ghosts.

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Manual Transmission Torque Specs

W55/W58 Manual Transmission

Component	Metric	Standard
Transmission to Engine (12mm)	71.6 N·m	53 ft-lb
Transmission to Engine (10mm)	37.3 N·m	27 ft-lb
Drain/Fill Plug	38 N·m	28 ft-lb
Propeller Shaft to Differential	74 N·m	54 ft-lb
Clutch Release Cylinder	11.7 N·m	9 ft-lb

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Automatic Transmission Torque Specs

Component	Metric	Standard
Transmission to Engine	72 N·m	53 ft-lb
Oil Pan	7.4 N·m	65 in-lb
Valve Body	10 N·m	7 ft-lb
Drain Plug	20 N·m	15 ft-lb
Torque Converter Bolts	48 N·m	35 ft-lb

Toyota automatic transmission pans use surprisingly low torque.

Stripping one because “tight is tight” is basically an IS300 rite of passage.

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Brake Torque Specs

Component	Metric	Standard
Front Caliper Bolts	34 N·m	25 ft-lb
Front Torque Plate	118 N·m	87 ft-lb
Rear Caliper	104 N·m	77 ft-lb
Brake Line Union Nut	15 N·m	11 ft-lb

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Suspension Torque Specs

Component	Metric	Standard
Lower Arm to Steering Knuckle	245 N·m	181 ft-lb
Shock to Steering Knuckle	64 N·m	47 ft-lb
Front Suspension Brace	119 N·m	88 ft-lb
Stabilizer Bar Nut	49 N·m	30 ft-lb

181 ft-lb on the lower arm hardware is Toyota’s way of saying:

“This suspension component should remain attached to the vehicle.”

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Propeller Shaft & Driveline Torque Specs

Component	Metric	Standard
Prop Shaft to Differential	74 N·m	54 ft-lb
Center Support Bearing	49 N·m	36 ft-lb
Intermediate Shaft Flange	181 N·m	134 ft-lb

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Important 2JZ-GE Service Specifications

Compression Specs

Specification	Measurement
Standard Compression	192 psi
Minimum Compression	156 psi
Max Cylinder Difference	14 psi

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Valve Clearance Specs

Valve	Metric	Standard
Intake	0.15–0.25 mm	0.006–0.010 in
Exhaust	0.25–0.35 mm	0.010–0.014 in

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Why Proper Torque Specs Matter On The 2JZ

The 2JZ is incredibly durable, but improper torque can still destroy:

• head gaskets
• bearings
• oil pumps
• valve covers
• transmission cases
• cooling systems

Toyota engineered this platform to survive abuse.

But even a 2JZ has limits.
Usually somewhere around:

• 38 psi
• marketplace turbo kits
• or “my tuner disappeared.”

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Final Thoughts

The Lexus IS300 and 2JZ-GE remain legendary because Toyota engineered these cars correctly from the start.

Using proper torque specs:

• improves reliability
• prevents leaks
• reduces component failure
• ensures proper clamping force
• protects aluminum threads

And most importantly:
it prevents turning your perfectly good IS300 into an extremely expensive driveway decoration.