Honda1986–1988Technical specifications

Legend 2.5: Technical specifications

Workshop data for the 2.5-litre petrol (engine code C25A2/A1). Covers engine, fluids, service and torques: the figures to check before a job or a parts order.

Common faults & fixes

Summary

Match the engine code (C25A2/A1) to the vehicle before ordering parts or applying these figures.

Vehicle specifications

Overview

Make: Honda
Model: Legend
Years: 1986–1988
Fuel: Petrol
Engine code: C25A2/A1

Performance & efficiency

Power: 127 kW (173 hp)
Engine size: 2,494 cc
Cylinders: 6 · OHC
Compression ratio: 9.6:1
Fuel system: Honda

Fluids & capacities

Engine oil (with the filter): 4.5 litres

All 89 specifications below

Engine & identification

Vehicle identification

No. of cylinders Type	6/OHC
Capacity (Fiscal) cc	2494 (2476)
Output - alternative kW (DIN hp) rpm	AT=123 (167)
Compression ratio :1	9,6
Suitable for unleaded petrol	Yes
Minimum octane rating RON	98/95
Ignition system Type	TSZ-i
Ignition system Description	Trans-i
Fuel system Make	Honda
Fuel system Type	PGM-FI
Fuel system Description	MFI-s

Ignition system

Ignition coil supply voltage + with ballast V	11,0
Primary resistance Ohm	0,3-0,4
Secondary resistance Ohm	9000-13600

Firing order

The firing order for the Honda Legend 2.5 (1986–1988) is 1-4-2-5-3-6.

Firing order	1-4-2-5-3-6

Valve clearances

Valve clearances on the Honda Legend 2.5 (1986–1988) are hydraulic — they self-adjust, so no manual clearance figure applies.

Valve clearance - INLET mm	Hydraulic
Valve clearance - EXHAUST mm	Hydraulic

Engine oil & fluids

Engine oil

The Honda Legend 2.5 (1986–1988) takes 4.5 litres of engine oil with the filter.

See the reference table for the complete engine oil entries and their conditions.

Manual gearbox

The manual gearbox has a listed capacity of 2.2 litres. The specified oil is SAE 15W-40.

Coolant

The total cooling-system capacity entries are 9.5 litres without a stated condition; 9.3 litres for AT.

Grades, filling conditions and capacities

Lubricants and capacities — complete reference
Engine oil options
Ambient temperature range	➞0°C
Engine oil grade SAE	5W-30
Engine oil classification API/ACEA	SG/A2
Ambient temperature range	-20°C➞35°C
Engine oil grade SAE	10W-30
Engine oil classification API/ACEA	SG/A2
Ambient temperature range	-20°C➞
Engine oil grade SAE	10W-40
Engine oil classification API/ACEA	SG/A2
Ambient temperature range	-15°C➞
Engine oil grade SAE	15W-40, 15W-50
Engine oil classification API/ACEA	SG/A2
Ambient temperature range	-10°C➞
Engine oil grade SAE	20W-40, 20W-50
Engine oil classification API/ACEA	SG/A2
Engine with filter(s) litres	4.5
Other lubricants and capacities
Manual transmission oil grade SAE	15W-40
Manual transmission litres	2.2
Automatic transmission fluid Type	Dexron II
Automatic transmission (drain & refill) litres	3.0
Cooling system - total capacity litres	9,5 AT=9,3

Service & electrical

Battery

The Honda Legend 2.5 (1986–1988) uses a 12 V, 60 Ah battery (reserve capacity 90 minutes).

Battery V/RC(Ah)	12/90 (60)

Spark plugs

The Honda Legend 2.5 (1986–1988) uses NGK BCPR6E-11 spark plugs with a 1,1 mm electrode gap.

Spark plugs Original equipment	NGK
Spark plug Type	BCPR6E-11
Electrode gap mm	1,1
Spark plugs Make	Autolite
Spark plug Type	3923
Electrode gap mm	1,1
Spark plugs Make	Beru
Spark plug Type	14FR-7DUX
Electrode gap mm	1,1
Spark plugs Make	Bosch
Spark plug Type	FR7DCX
Electrode gap mm	1,1
Spark plugs Make	Champion
Spark plug Type	RC9YCC4
Electrode gap mm	1,1
Spark plugs Make	NGK
Spark plug Type	BCPR6E-11
Electrode gap mm	1,1

Tuning and emissions

Ignition timing	Without vacuum
Ignition timing - basic BTDC °Engine/rpm	5/770 AT=7
Ignition timing - alternative °Engine/rpm	95=1 Cat=3
Idle speed rpm	770±50
Fast idle speed - MT/AT rpm	1100-1900
Oil temperature °C	80
CO level at idle speed - tailpipe Vol. % CO	1,0±1,0
CO level at idle speed - tailpipe (Cat) Vol. % CO	0,1 Max Not adjustable
HC level at idle speed ppm	300
CO2 level at idle speed Vol. % CO2	13-16
O2 level at idle speed Vol. % O2	0,5-2,0

Starting and charging

Starter motor Make	Nippon Denso
Minimum starting voltage V	12,0
Maximum cranking amps A	162-198
Alternator output A/V/rpm	70/13,5/5500
Regulated voltage V	13,9-15,1

Service checks and adjustments

Compression pressure bar	10,0-12,0
Oil pressure bar/rpm	5,0-5,8/3000
Radiator cap bar	0,90-1,20
Thermostat opens °C	76-80
Drive belt tension - alternator/PAS/AC mm	18-22/19-24

Fuel system

System pressure bar	2,55-2,85

Tightening torques

Cylinder head bolt torque

The cylinder head bolts on the Honda Legend 2.5 (1986–1988) are tightened in 2 stages: 40 Nm, then a final 78 Nm.

Cylinder head
Tighten	40 Nm
Tighten	78 Nm

Other engine tightening torques
Cylinder head instructions	—
Main bearings Stage 1	—
Main bearings
Big end bearings Stage 1	22 Nm
Big end bearings Stage 2	45 Nm
Flywheel/driveplate	105 Nm/75 Nm
Crankshaft pulley/damper centre bolt	115 Nm
Spark plugs	18 Nm
Chassis tightening torques
Front hub	250 Nm
Rear hub	245 Nm
Road wheels	108 Nm

Frequently asked questions

What is the firing order of the Honda Legend 2.5?

The firing order for the Honda Legend 2.5 (1986–1988) is 1-4-2-5-3-6.

What spark plugs does the Honda Legend 2.5 use?

The Honda Legend 2.5 (1986–1988) uses NGK BCPR6E-11 spark plugs with a 1,1 mm electrode gap.

How much oil does the Honda Legend 2.5 take?

The Honda Legend 2.5 (1986–1988) takes 4.5 litres of engine oil with the filter. See the reference table for the complete engine oil entries and their conditions.

What are the valve clearances for the Honda Legend 2.5?

Valve clearances on the Honda Legend 2.5 (1986–1988) are hydraulic — they self-adjust, so no manual clearance figure applies.

What is the cylinder head torque for the Honda Legend 2.5?

The cylinder head bolts on the Honda Legend 2.5 (1986–1988) are tightened in 2 stages: 40 Nm, then a final 78 Nm.

What battery does the Honda Legend 2.5 use?

The Honda Legend 2.5 (1986–1988) uses a 12 V, 60 Ah battery (reserve capacity 90 minutes).