Toyota1988–1990Technical specifications

Landcruiser 4.0 Turbo: Technical specifications

Workshop data for the 4-litre diesel (engine code 12H-T). Covers engine, fluids, brakes, service, torques and air conditioning: the figures to check before a job or a parts order.

Summary

Match the engine code (12H-T) to the vehicle before ordering parts or applying these figures.

Vehicle specifications

Overview

Make: Toyota
Model: Landcruiser
Years: 1988–1990
Fuel: Diesel
Engine code: 12H-T

Performance & efficiency

Power: 100 kW (136 hp)
Engine size: 3,980 cc
Cylinders: 6 · OHV
Compression ratio: 18.6:1

Fluids & capacities

Engine oil (with the filter): 9.7 litres

All 96 specifications below

Engine & identification

Vehicle identification

No. of cylinders Type	6/OHV
Capacity cc	3980
Compression ratio :1	18,6

Injection system

Fuel/injection pump assembly Make	Denso
Injector nozzle Make	Denso
Nozzle opening pressure - new/used bar	196-206/176
Leak rate (dribble) bar/secs	166/10

Injection sequence

The injection sequence for the Toyota Landcruiser 4.0 Turbo (1988–1990) is 1-4-2-6-3-5.

Injection sequence	1-4-2-6-3-5

Valve clearances

Valve clearances for the Toyota Landcruiser 4.0 Turbo (1988–1990) are 0,20 mm inlet and 0,36 mm exhaust, measured hot.

Valve clearance - INLET mm	0,20 hot
Valve clearance - EXHAUST mm	0,36 hot

Engine oil & fluids

Engine oil

The Toyota Landcruiser 4.0 Turbo (1988–1990) takes 9.7 litres of engine oil with the filter.

A listed engine oil option is SAE 10W-30 for cold climates, with API/ACEA classification CF/B2.

A listed engine oil option is SAE 10W-40 for moderate climates, with API/ACEA classification CF/B2.

A listed engine oil option is SAE 20W-50 as an alternative for moderate climates.

A listed engine oil option is SAE 20W-40 for hot climates, with API/ACEA classification CF/B2.

Manual gearbox

The specified manual gearbox oil is SAE 75W-90.

See the reference table for the complete manual gearbox entries and their conditions.

Coolant

The listed total cooling-system capacity is 15.4 litres.

Grades, filling conditions and capacities

Lubricants and capacities — complete reference
Engine oil options
Ambient temperature range	Cold climate
Engine oil grade SAE	10W-30
Engine oil classification API/ACEA	CF/B2
Ambient temperature range	Moderate climate
Engine oil grade SAE	10W-40
Engine oil classification API/ACEA	CF/B2
Ambient temperature range	Moderate climate alternative
Engine oil grade SAE	20W-50
Ambient temperature range	Hot climate
Engine oil grade SAE	20W-40
Engine oil classification API/ACEA	CF/B2
Engine with filter(s) litres	9.7
Other lubricants and capacities
Manual transmission oil grade SAE	75W-90
Manual transmission litres	4,9/2,2
Automatic transmission fluid Type	Dexron II
Automatic transmission (drain & refill) litres	5.0
Differential front/AT litres	3.0
Differential oil grade - rear SAE	80W-90
Differential rear litres	2.1-2.5
Cooling system - total capacity litres	15.4

Brakes & wear limits

Brake disc thickness

Brake discs on the Toyota Landcruiser 4.0 Turbo (1988–1990) are replaced at a minimum thickness of 19 mm (ventilated) front and 16 mm rear.

Minimum disc thickness for replacement - ventilated Front	19 mm
Minimum disc thickness for replacement Rear	16 mm
Maximum drum diameter for replacement Rear	211 mm

Brake disc and drum dimensions

Disc runout Front	0,15 mm
Minimum pad thickness Front	1 mm
Minimum shoe thickness Rear	1,5 mm
Parking brake travel No. of notches	7-9

Service & electrical

Battery

The Toyota Landcruiser 4.0 Turbo (1988–1990) uses a 24 V, 80 Ah battery (reserve capacity 130 minutes).

Battery V/RC(Ah)	24/130 (80)

Tuning and emissions

Crankshaft position (n = ATDC) °BTDC	11
Adjusting method Engine/Pump	Pointer/Overflow
Idle speed rpm	650
Idle speed - alternative rpm	AT=700
Rated no load speed rpm	4170
Oil temperature °C	80
Idle speed - for smoke test rpm	625-675 AT=745-795
Governed speed range - for smoke test rpm	4100-4150
Maximum time at governed speed secs	1,0
Test mode A/B	B
Probe type 1/2	1
Conditioning Accelerations/rpm	3
Smoke opacity - EU limit m-1 (%)	3,00 (73)
Smoke opacity - homologation value m-1 (%)	2,50 (66)

Starting and charging

Starter motor Make	Denso
Starter motor Type	4,5 kW
Maximum cranking amps A	216-264
Alternator Make	Denso
Alternator Type	30A
Alternator output A/V/rpm	15/28/2000
Regulated voltage V	27,9-28,5

Service checks and adjustments

Compression pressure bar	19,6-29,4
Turbo boost pressure bar/rpm	0,38-0,52/4170
Oil pressure bar/rpm	2,4-5,9/3000
Radiator cap bar	0,74-1,03
Thermostat opens °C	80-84
Drive belt tension - alternator/PAS/AC mm	10-13

Tightening torques

Cylinder head bolt torque

The cylinder head bolts on the Toyota Landcruiser 4.0 Turbo (1988–1990) are tightened in 3 stages: 40 Nm, then 70 Nm, then a final 113 Nm.

Cylinder head
Renew bolts	No
Tighten	40 Nm
Tighten	70 Nm
Tighten	113 Nm

Other engine tightening torques
Cylinder head instructions	—
Main bearings Renew bolts/nuts	No
Main bearings Stage 1	72 Nm
Main bearings Stage 2	136 Nm
Big end bearings Renew bolts/nuts	No
Big end bearings Stage 1	44 Nm
Big end bearings Stage 2	88 Nm
Sump bolts	13 Nm
Sump drain bolt	39 Nm
Flywheel/driveplate	118/87 Nm
Clutch pressure plate	19 Nm
Crankshaft pulley/damper centre bolt	441 Nm
Camshaft sprocket/gear	44 Nm
Camshaft/rocker cover	7 Nm
Inlet manifold to cylinder head	18 Nm
Exhaust manifold to cylinder head	21 Nm
Injector/clamp	18 Nm
Injector pipe unions	29 Nm
Injector nozzle to holder	34 Nm
Fuel/injection pump sprocket/gear	74 Nm
Chassis tightening torques
Steering track rod end	91 Nm
Brake caliper/carrier to hub Front	123 Nm
Brake caliper/carrier to hub Rear	103 Nm
Back plate to hub Rear	123 Nm
Road wheels	147 Nm

Air conditioning

Air conditioning refrigerant Type	R12
Air conditioning refrigerant quantity grams	700±50
Air conditioning oil Type	Dens Oil 6

Frequently asked questions

What is the injection sequence of the Toyota Landcruiser 4.0 Turbo?

The injection sequence for the Toyota Landcruiser 4.0 Turbo (1988–1990) is 1-4-2-6-3-5.

How much oil does the Toyota Landcruiser 4.0 Turbo take?

The Toyota Landcruiser 4.0 Turbo (1988–1990) takes 9.7 litres of engine oil with the filter. A listed engine oil option is SAE 10W-30 for cold climates, with API/ACEA classification CF/B2. A listed engine oil option is SAE 10W-40 for moderate climates, with API/ACEA classification CF/B2. A listed engine oil option is SAE 20W-50 as an alternative for moderate climates. A listed engine oil option is SAE 20W-40 for hot climates, with API/ACEA classification CF/B2.

What are the valve clearances for the Toyota Landcruiser 4.0 Turbo?

Valve clearances for the Toyota Landcruiser 4.0 Turbo (1988–1990) are 0,20 mm inlet and 0,36 mm exhaust, measured hot.

What is the cylinder head torque for the Toyota Landcruiser 4.0 Turbo?

The cylinder head bolts on the Toyota Landcruiser 4.0 Turbo (1988–1990) are tightened in 3 stages: 40 Nm, then 70 Nm, then a final 113 Nm.

What is the minimum brake disc thickness for the Toyota Landcruiser 4.0 Turbo?

Brake discs on the Toyota Landcruiser 4.0 Turbo (1988–1990) are replaced at a minimum thickness of 19 mm (ventilated) front and 16 mm rear.

What battery does the Toyota Landcruiser 4.0 Turbo use?

The Toyota Landcruiser 4.0 Turbo (1988–1990) uses a 24 V, 80 Ah battery (reserve capacity 130 minutes).