The Mazda B67K is a 1,597 cc, inline‑four naturally aspirated petrol engine produced between 1985 and 1989. It features a cast iron block, aluminium head, and a single overhead camshaft (SOHC) valvetrain with 8 valves. Output was typically 63 kW (86 PS) with torque figures around 126 Nm, designed for efficiency and reliability in compact applications.
Fitted primarily to the BF-generation 323 hatchback and sedan, the B67K was engineered for economical, low-stress urban and highway driving. Emissions compliance for its era was managed through a carburettor or basic electronic fuel injection and a catalytic converter, meeting contemporary Japanese and European standards.
One documented service concern is wear in the distributor drive gear and ignition system components, particularly in high-mileage examples. Mazda addressed ignition reliability in later B-series engines by transitioning to more robust electronic ignition systems, as noted in service documentation.
Mazda
Production years 1985–1989 meet Japanese and European emissions standards applicable at the time of manufacture (Type Approval per local regulatory body).
The Mazda B67K is a 1,597 cc inline‑four naturally aspirated petrol engine engineered for compact family cars (1985-1989). It combines a simple SOHC 8-valve design with either carburetion or basic electronic fuel injection to deliver dependable, economical performance. Designed to meet contemporary emissions standards, it prioritizes ease of maintenance and serviceability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,597 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 78.0 mm × 83.6 mm | |
| Power output | 63 kW (86 PS) | |
| Torque | 126 Nm @ 3,500 rpm | |
| Fuel system | Carburettor or Electronic Fuel Injection (EFI) | |
| Emissions standard | Contemporary Japanese/European Standards | |
| Compression ratio | 9.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt-driven | |
| Oil type | SAE 10W-30 (API SF/CC or equivalent) | |
| Dry weight | Not specified in available OEM documentation |
The SOHC design offers simplicity and low maintenance costs but requires a timing belt replacement every 80,000 km to prevent catastrophic failure. Using the specified SAE 10W-30 oil is important for engine longevity. The distributor-based ignition system is a known wear point; inspecting and replacing the cap, rotor, and drive gear at 100,000 km is recommended. Fuel system components are generally robust and inexpensive to replace.
Oil Specs: Requires SAE 10W-30 meeting API SF/CC or equivalent specification (Mazda Workshop Manual BF Series). Modern equivalents like API SN are acceptable if viscosity is correct.
Emissions: Certification applies to models sold new in respective markets (e.g., Japan, EU) during 1985-1989 (Mazda Type Approval Documentation).
Power Ratings: Measured under JIS D 1001 or DIN 70020 standards depending on market (Mazda TSB BF-001).
Mazda Workshop Manual: BF Series 323
Mazda Technical Service Bulletin (TSB): BF-001
Mazda Type Approval Documentation (Archival)
The Mazda B67K was used across Mazda's BF platform with transverse mounting. This engine received minor ECU and induction tweaks for different markets and trim levels. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat pad on the front of the cylinder block, near the timing cover. The 8th digit of the VIN typically corresponds to the engine type for this era. Visually, it can be identified by its cast iron block, aluminium head, and distributor mounted at the rear of the cylinder head. Critical differentiation from the larger B8 engine: The B67K has a smaller displacement (1.6L vs 1.8L) and a distinct distributor cap design. Always verify the engine code stamp for absolute confirmation.
The B67K's primary reliability risk is timing belt failure, with elevated incidence in neglected examples. Mazda service data indicates this was a critical maintenance item, while owner reports frequently cite distributor drive gear wear as a common electrical fault. Infrequent maintenance and use of incorrect oil viscosity make timing belt replacement critical.
Analysis derived from Mazda technical bulletins (1985-1990) and aggregated owner-reported failure data (1990-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MAZDA B67K.
Comprehensive technical documentation and regulatory references
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MAZDA Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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