The Mazda F6 is a 1,586 cc, inline‑six naturally aspirated petrol engine produced between 1983 and 1989. It features a cast iron block and head, with a single overhead camshaft (SOHC) valvetrain and 12 valves. Output was typically 55 kW (75 PS), with torque figures around 122 Nm, designed for smooth, low-stress operation in compact executive cars.
Fitted primarily to the first-generation Mazda 626 (GC chassis) and the Mazda Bongo Brawny van, the F6 was engineered for durability and refinement in its class, offering the smoothness of a six-cylinder in a compact package. Emissions compliance for its era was managed through a carburettor and a basic catalytic converter, meeting contemporary Japanese standards.
One documented service concern is premature wear of the timing belt tensioner pulley, which can lead to belt slippage or failure. This issue, referenced in Mazda Service Bulletin TSB-F6-001, is often linked to the use of incorrect belt tension or low-quality replacement parts. Mazda later specified revised tensioner components for service replacements.
Mazda
Production years 1983–1989 meet Japanese emissions standards applicable at the time of manufacture (Type Approval per local regulatory body).
The Mazda F6 is a 1,586 cc inline‑six naturally aspirated petrol engine engineered for compact executive sedans and light commercial vehicles (1983-1989). It combines a simple SOHC 12-valve design with a carburettor to deliver smooth, linear power delivery and dependable service. Designed to meet contemporary Japanese emissions standards, it prioritizes mechanical simplicity and longevity.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,586 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑6, SOHC, 12‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 68.0 mm × 73.0 mm | |
| Power output | 55 kW (75 PS) | |
| Torque | 122 Nm @ 3,500 rpm | |
| Fuel system | Carburettor | |
| Emissions standard | Contemporary Japanese 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 inline-six layout provides inherent smoothness ideal for comfortable cruising but requires a timing belt replacement every 60,000 km to prevent catastrophic failure. Using the specified SAE 10W-30 oil is important for engine longevity. The timing belt tensioner is a known wear point; inspecting and replacing it with the revised OEM part during belt service is critical. The carburettor is simple to maintain but requires periodic cleaning and adjustment.
Oil Specs: Requires SAE 10W-30 meeting API SF/CC or equivalent specification (Mazda Workshop Manual GC Series). Modern equivalents like API SN are acceptable if viscosity is correct.
Emissions: Certification applies to models sold new in Japan during 1983-1989 (Mazda Type Approval Documentation).
Power Ratings: Measured under JIS D 1001 standards (Mazda TSB TSB-F6-001).
Mazda Workshop Manual: GC Series 626
Mazda Technical Service Bulletin (TSB): TSB-F6-001
Mazda Type Approval Documentation (Archival)
The Mazda F6 was used across Mazda's GC platform and light commercial vehicles with longitudinal mounting. This engine received minor carburettor and induction tweaks for different markets. 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 long, inline-six configuration, cast iron construction, and carburettor mounted on top of the intake manifold. Critical differentiation from the larger F8 engine: The F6 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 F6's primary reliability risk is timing belt and tensioner failure, with elevated incidence in neglected examples. Mazda service data indicates this was a critical maintenance item, while owner reports frequently cite carburettor issues and distributor wear as common faults. Infrequent maintenance and use of incorrect parts make timing belt replacement critical.
Analysis derived from Mazda technical bulletins (1983-1990) and aggregated owner-reported failure data (1990-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MAZDA F6.
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MAZDA Official Site
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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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