Daihatsu F300 HD Engine 1989 Workshop Manual (P/N WN88E-00001)

The February 1989 Daihatsu factory workshop manual, P/N WN88E-00001, covers maintenance and repair of Type HD engines installed in the F300, including carbureted HD-C and electronic fuel-injected HD-E configurations. This is the engine volume; associated chassis procedures referenced during engine removal require the separate Chassis Workshop Manual.

Text Search, Section Indexes and Wiring Detail

Finding sections and reading diagrams: PDF text search and embedded bookmarks are not available. Printed section indexes provide orientation. Small wire codes and terminal labels on the wide wiring sheets require zooming; the checked details remain readable when enlarged.

One printable, English-language 440-page PDF contains 11 main sections and four appendices. The total includes two opening pages and 29 appendix pages: special service tools, 6 pages; service specifications, 13 pages; tightening torque, 5 pages; and wiring diagrams, 5 pages.

HD Engine Overhaul, Fuel Systems and Electrical Diagnosis

These are selected coverage highlights, rather than a complete contents list. Further topics include oil-cooler service and auxiliary-air-valve checks.

• Engine repair: Step-by-step timing-belt replacement and tensioning, cylinder-head disassembly, valve-clearance adjustment, and cylinder-block inspection.

• HD-C fuel system: Carburetor removal, disassembly, inspection, reassembly and adjustment, plus mechanical fuel-pump testing and fuel-filter replacement.

• HD-E EFI diagnosis: Check-engine-lamp code interpretation, symptom-based troubleshooting, ECU circuit measurements, sensor checks, fuel-pressure testing, and injector inspection.

• Cooling and lubrication: Water-pump replacement, thermostat testing, radiator-cap and cooling-system pressure checks, oil-pressure measurement, and oil-pump inspection.

• Ignition service: Distributor disassembly and assembly, signal-generator adjustment, vacuum-advance checks, ignition-coil testing, and ignition-timing adjustment.

• Starting and charging: Conventional and reduction-type starter overhaul and performance tests, battery checks, alternator disassembly, and component inspection.

• Electrical references: EFI System Circuit, ECU connector views, Starting System Circuit, Charging System Circuit, and HD-1–HD-3 wiring sheets.

Suited to mechanics and experienced DIY owners comfortable with precision engine measurements and electrical testing, with access to the specified gauges and special service tools.

Engine Mechanicals and Maintenance

The maintenance section pairs a service schedule with cold- and hot-engine operations. Separate HD-C and HD-E instructions distinguish fuel-system checks, intake components and engine wiring rather than treating both configurations as interchangeable.

Internal engine coverage extends beyond teardown. Cylinder-head inspection includes flatness, cracks, valve guides, valve seats, rocker components and camshaft bearings. Bottom-end sections cover piston and ring inspection, cylinder boring, crankshaft measurements, oil seals, and main- and connecting-rod-bearing selection.

The bearing classification charts connect measured dimensions and component codes with replacement-bearing selection, supporting parts decisions during an overhaul. Exploded component views identify assembly relationships and non-reusable parts.

The cylinder-head section warns that excessive impact during valve-guide installation can crack the guides. Timing-belt illustrations also distinguish the crankshaft timing pulley from the separately attached outer pulley.

Always observe standard shop safety protocols and use appropriate heavy-duty jack stands when performing any under-vehicle maintenance detailed in this reference guide.

Carburetor, EFI and Emission Controls

Carburetor service: The HD-C procedures address the air horn, float and needle valve, jets, power valve, acceleration pump and secondary-throttle diaphragm. The cleaning instructions warn that wire or drill cleaning can enlarge jet openings and adversely affect fuel economy.

Emission-control sections distinguish the choke-breaker and spark-delay systems from the HD-E arrangements. Vacuum-hose layouts accompany PCV, evaporative-emission and throttle-positioner checks; the HD-C evaporative-control section identifies its GCC-specific application.

EFI fault tracing: No-start, stalling, rough-idle and acceleration charts link symptoms with diagnostic codes and component checks. ECU connector assignments and voltage/resistance tables support separating wiring and sensor faults from suspected ECU faults.

The electrical checks specify the EFC-II computer check sub-harness, 09842-87701-000. Fuel-system procedures extend to injector delivery and leakage testing, pressure-regulator inspection, and throttle-body service. Automatic-transmission vehicles receive a specific note about different throttle-position-sensor connectors.

Ignition, Starter and Alternator Inspection

Distributor procedures cover the signal generator, governor components and vacuum advancer. Circuit diagrams connect these component checks with the ignition system.

Starter inspection includes armature, commutator, brushes, clutch and magnetic-switch checks. Alternator procedures cover rotor and stator continuity, rectifier checks, brush replacement and bearing replacement, alongside loaded and unloaded charging-system tests.

Selected Head-Assembly, Bearing and Injector Specifications

Cylinder-head assembly specifies 6.0–6.8 kg-m (43.4–49.2 ft-lb) for oiled head bolts, tightened evenly in stages. Camshaft-bearing inspection lists a specified oil clearance of 0.035–0.076 mm and an allowable limit of 0.17 mm.

For HD-E injector electrical inspection, specified resistance is 12–16 Ω at 20°C. These references accompany the relevant assembly and inspection procedures.