Asia1993–2000Technical specifications

Rocsta 1.8: Technical specifications

Workshop data for the 1.8-litre petrol (engine code JF8). Covers engine, fluids, brakes, service and torques: the figures to check before a job or a parts order.

Summary

Match the engine code (JF8) to the vehicle before ordering parts or applying these figures.

Vehicle specifications

Overview

Make: Asia
Model: Rocsta
Years: 1993–2000
Fuel: Petrol
Engine code: JF8

Performance & efficiency

Power: 62 kW (84 hp)
Engine size: 1,789 cc
Cylinders: 4 · OHC
Compression ratio: 8.6:1
Fuel system: Hitachi

Fluids & capacities

Engine oil (with the filter): 4.1 litres

All 119 specifications below

Engine & identification

Vehicle identification

No. of cylinders Type	4/OHC
Capacity (Fiscal) cc	1789 (1776)
Compression ratio :1	8,6
Suitable for unleaded petrol	Yes
Minimum octane rating RON	95
Ignition system Type	HEI
Ignition system Description	Trans-i
Trigger location	Distributor
Fuel system Make	Hitachi
Fuel system Description	Carb-Elec

Ignition system

Ignition coil Make	Hanshin
Ignition coil supply voltage + with ballast V	11,0
Primary resistance Ohm	1,0-1,3
Secondary resistance Ohm	10000-30000
Distributor (ECM) Make	Mitsubishi

Firing order

The firing order for the Asia Rocsta 1.8 (1993–2000) is 1-3-4-2.

Firing order	1-3-4-2

Valve clearances

Valve clearances for the Asia Rocsta 1.8 (1993–2000) are 0,30 mm inlet and 0,30 mm exhaust, measured hot.

Valve clearance - INLET mm	0,30 hot
Valve clearance - EXHAUST mm	0,30 hot

Engine oil & fluids

Engine oil

The Asia Rocsta 1.8 (1993–2000) takes 4.1 litres of engine oil with the filter.

A listed engine oil option is SAE 5W-30 for cold climates, with API/ACEA classification SF.

A listed engine oil option is SAE 15W-40 for moderate climates, with API/ACEA classification SF.

A listed engine oil option is SAE 10W-30 as an alternative for moderate climates.

A listed engine oil option is SAE 30W-40 for hot climates, with API/ACEA classification SF.

Manual gearbox

The manual gearbox has a listed capacity of 2.0 litres. The specified oil is SAE 80W-90, with classification GL-4.

Transfer box

The transfer box has a listed capacity of 1.3 litres. The specified oil is SAE 80W-90, with classification GL-4.

Coolant

The listed total cooling-system capacity is 7.0 litres.

Grades, filling conditions and capacities

Lubricants and capacities — complete reference
Engine oil options
Ambient temperature range	Cold climate
Engine oil grade SAE	5W-30
Engine oil classification API/ACEA	SF
Ambient temperature range	Moderate climate
Engine oil grade SAE	15W-40
Engine oil classification API/ACEA	SF
Ambient temperature range	Moderate climate alternative
Engine oil grade SAE	10W-30
Ambient temperature range	Hot climate
Engine oil grade SAE	30W-40
Engine oil classification API/ACEA	SF
Engine with filter(s) litres	4.1
Other lubricants and capacities
Manual transmission oil grade SAE	80W-90
Manual transmission oil classification	GL-4
Manual transmission litres	2.0
Differential oil grade - front SAE	80W-90
Differential oil classification - front	GL-5
Differential front/AT litres	0.8
Differential oil grade - rear SAE	80W-90
Differential oil classification - rear	GL-4
Differential rear litres	0.8
Transfer box oil grade SAE	80W-90
Transfer box oil classification	GL-4
Transfer box litres	1.3
Cooling system - total capacity litres	7.0
Brake fluid Type	DOT 3/4
Power steering fluid Type	Dexron II
Power steering fluid litres	2.0

Brakes & wear limits

Brake disc thickness

Brake discs on the Asia Rocsta 1.8 (1993–2000) are replaced at a minimum thickness of 18 mm (ventilated) front; the rear brake drums are replaced at a maximum diameter of 261 mm.

Minimum disc thickness for replacement - ventilated Front	18 mm
Maximum drum diameter for replacement Rear	261 mm

Brake disc and drum dimensions

Disc runout Front	0,15 mm
Minimum pad thickness Front	1 mm
Minimum shoe thickness Rear	1 mm
Parking brake travel No. of notches	8-12

Service & electrical

Ignition timing

Basic ignition timing for the Asia Rocsta 1.8 (1993–2000) is 6°±1° BTDC at 750 rpm.

Ignition timing	Without vacuum
Ignition timing - basic BTDC °Engine/rpm	6±1/750

Battery

The Asia Rocsta 1.8 (1993–2000) uses a 12 V, 60 Ah battery (reserve capacity 90 minutes).

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

Spark plugs

The Asia Rocsta 1.8 (1993–2000) uses NGK BP5E-VG spark plugs with a 0,8 mm electrode gap.

Spark plugs Original equipment	NGK
Spark plug Type	BP5E-VG
Electrode gap mm	0,8
Spark plugs Make	Beru
Spark plug Type	14R-8DU
Electrode gap mm	0,8
Spark plugs Make	Champion
Spark plug Type	RN9YC
Electrode gap mm	0,6
Spark plugs Make	NGK
Spark plug Type	BP5E-VG
Electrode gap mm	0,8

Tuning and emissions

Ignition advance	Without vacuum and basic timing
Ignition advance checks °Engine/rpm	0-1/650
Ignition advance checks °Engine/rpm	4-6/1100
Ignition advance checks °Engine/rpm	12-14/1800
Vacuum check	Ignition timing advances
Vacuum range °Engine	6-8
Vacuum starts mbar	133
Vacuum ends mbar	293
Idle speed rpm	750-800
Idle speed - alternative rpm	AT=900-950
Oil temperature °C	60
CO level at idle speed - tailpipe Vol. % CO	0,5 Max
CO level at idle speed - tailpipe (Cat) Vol. % CO	0,5 Max
HC level at idle speed ppm	100
CO2 level at idle speed Vol. % CO2	13-16
O2 level at idle speed Vol. % O2	0,5-2,0
CO content at increased idle speed Vol. %	0,3

Starting and charging

Starter motor Make	Mitsubishi
Starter motor Type	0,9 kW
Maximum cranking amps A	162-198
Alternator Make	Mitsubishi
Alternator Type	55A
Alternator output A/V/rpm	55/12/-
Regulated voltage V	14,7±0,3

Service checks and adjustments

Oil pressure bar/rpm	3,0-4,0/3000
Radiator cap bar	0,75-1,05
Thermostat opens °C	82
Drive belt tension - alternator/PAS/AC mm	10-12
Drive belt tension - AC mm	4-5

Fuel system

Fuel pump delivery pressure bar	0,23-0,30

Tightening torques

Cylinder head bolt torque

The cylinder head bolts on the Asia Rocsta 1.8 (1993–2000) are tightened in 3 stages: 32-38 Nm, then 62-68 Nm, then a final 82-88 Nm.

Cylinder head
Tighten	32-38 Nm
Tighten	62-68 Nm
Tighten	82-88 Nm

Other engine tightening torques
Cylinder head instructions	—
Main bearings Renew bolts/nuts	No
Main bearings Stage 1	44-54 Nm
Main bearings Stage 2	84-94 Nm
Big end bearings Renew bolts/nuts	No
Big end bearings Stage 1	36-40 Nm
Big end bearings Stage 2	66-70 Nm
Oil pump to cylinder block	—
Oil pump to cylinder block
Sump bolts	7-12 Nm
Flywheel/driveplate	98-105 Nm
Clutch pressure plate	18-27 Nm
Crankshaft pulley/damper centre bolt	160-170 Nm
Camshaft sprocket/gear	48-66 Nm
Camshaft carrier/cap	18-27 Nm
Camshaft/rocker cover	3-4 Nm
Inlet manifold to cylinder head	19-26 Nm
Exhaust manifold to cylinder head	22-29 Nm
Spark plugs	15-23 Nm
Engine oil pressure switch	12-18 Nm
Chassis tightening torques
Steering track rod end	60-80 Nm
Road wheels	88-108 Nm

Frequently asked questions

What is the firing order of the Asia Rocsta 1.8?

The firing order for the Asia Rocsta 1.8 (1993–2000) is 1-3-4-2.

What spark plugs does the Asia Rocsta 1.8 use?

The Asia Rocsta 1.8 (1993–2000) uses NGK BP5E-VG spark plugs with a 0,8 mm electrode gap.

How much oil does the Asia Rocsta 1.8 take?

The Asia Rocsta 1.8 (1993–2000) takes 4.1 litres of engine oil with the filter. A listed engine oil option is SAE 5W-30 for cold climates, with API/ACEA classification SF. A listed engine oil option is SAE 15W-40 for moderate climates, with API/ACEA classification SF. A listed engine oil option is SAE 10W-30 as an alternative for moderate climates. A listed engine oil option is SAE 30W-40 for hot climates, with API/ACEA classification SF.

What are the valve clearances for the Asia Rocsta 1.8?

Valve clearances for the Asia Rocsta 1.8 (1993–2000) are 0,30 mm inlet and 0,30 mm exhaust, measured hot.

What is the cylinder head torque for the Asia Rocsta 1.8?

The cylinder head bolts on the Asia Rocsta 1.8 (1993–2000) are tightened in 3 stages: 32-38 Nm, then 62-68 Nm, then a final 82-88 Nm.

What is the ignition timing for the Asia Rocsta 1.8?

Basic ignition timing for the Asia Rocsta 1.8 (1993–2000) is 6°±1° BTDC at 750 rpm.