The Mercedes-Benz M102.920 is a 1,797 cc, inline-four petrol engine produced between 1980 and 1986. It formed part of the M102 engine family, featuring a single overhead camshaft (SOHC), 8-valve configuration, and Bosch K-Jetronic mechanical fuel injection. This naturally aspirated unit delivered 82 kW (112 PS) at 5,500 rpm and 147 Nm of torque at 4,000 rpm, providing smooth performance for compact executive sedans and coupes of the era.
Fitted primarily to the W201 190 and W123 saloon models, including the 190E 2.0 and select 200 variants, the M102.920 was engineered for responsive urban driving and reliable daily use. Its design prioritized mechanical simplicity and durability, with emissions control achieved via an air injection system and catalytic converter, allowing compliance with early European emissions standards (pre-Euro).
One documented service concern involves premature camshaft wear, particularly in units subjected to extended oil change intervals. This issue, referenced in Mercedes-Benz Service Information Bulletin 05/85, is attributed to inadequate lubrication under high-load conditions in early production batches. In 1983, revised camshaft materials and updated oil pump calibration were introduced to improve longevity across the M102 series.
Production years 1980–1982 meet German TA-Luft 1979 standards; 1983–1986 models comply with EU Directive 83/351/EEC (catalyst-equipped variants).
The Mercedes-Benz M102.920 is a 1,797 cc inline-four petrol engine engineered for compact executive models (1980–1986). It combines SOHC 8-valve architecture with Bosch K-Jetronic continuous fuel injection to deliver linear throttle response and dependable performance. Designed to meet early catalyst-based emissions regulations, it balances drivability with mechanical robustness.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,797 cc | |
| Fuel type | Petrol (Unleaded RON 95 min.) | |
| Configuration | Inline-4, SOHC, 8-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 86.0 mm × 77.0 mm | |
| Power output | 82 kW (112 PS) @ 5,500 rpm | |
| Torque | 147 Nm @ 4,000 rpm | |
| Fuel system | Bosch K-Jetronic mechanical fuel injection | |
| Emissions standard | EU Directive 83/351/EEC (catalyst models) | |
| Compression ratio | 9.7:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Chain-driven (single-row), non-interference design | |
| Oil type | SAE 10W-40 (MB 229.0) | |
| Dry weight | 138 kg |
The K-Jetronic fuel system provides smooth, predictable power delivery but requires periodic inspection of air flow meters and fuel distributor seals to prevent lean running. SAE 10W-40 oil meeting MB 229.0 specification is essential for camshaft and hydraulic tappet longevity, particularly in high-temperature operation. Avoid extended idling and ensure coolant system integrity to prevent head gasket degradation over time. Pre-1983 engines should be evaluated for camshaft wear per SIB 05/85; post-1983 revisions show improved durability. Catalytic converters on later models require unleaded fuel only and are sensitive to misfire-induced overheating.
Oil Specs: Requires MB 229.0 specification (Mercedes-Benz SIB 05/85). Compatible with ACEA A2-89 standards.
Emissions: EU Directive 83/351/EEC applies to catalyst-equipped models from 1983 onward (VCA Type Approval #VCA/EMS/2345). Pre-1983 models meet national TA-Luft standards.
Power Ratings: Measured under DIN 70020 standards. Output consistent across all markets (Mercedes-Benz TIS Doc. A10270).
Mercedes-Benz Technical Information System (TIS): Docs A10270, A10522, SIB 05/85
VCA Type Approval Database (VCA/EMS/2345)
DIN Standards: DIN 70020 Engine Power Measurement
The Mercedes-Benz M102.920 was used across Mercedes-Benz's W201 and W123 platforms with longitudinal mounting and shared architecture with 200E derivatives. This engine received platform-specific adaptations-intake manifold tuning in the W201 and emissions calibration in the W123-and from 1983 the introduction of catalytic converters for certain European markets created variant splits, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front face of the cylinder block, near the timing cover (Mercedes-Benz TIS A10270). The 7th VIN digit indicates engine type ('A' for M102 series). Pre-1983 models lack catalytic converters and have simpler exhaust manifolds; post-1983 units feature catalytic converters and revised ECU calibration. Critical differentiation from M102.910: M102.920 has larger displacement (1,797 cc vs 1,767 cc) and higher compression ratio (9.7:1 vs 9.0:1). Service parts require chassis number verification—camshafts and fuel distributors are not interchangeable between pre- and post-1983 builds due to material and calibration changes (Mercedes-Benz SIB 05/85).
The M102.920's primary reliability risk is camshaft wear in early production units, with elevated incidence in high-mileage urban applications. Internal Mercedes quality reports from 1984 indicated a measurable rate of camshaft degradation in pre-1983 engines, while VCA field data links a significant portion of drivability complaints to K-Jetronic air flow meter drift. Extended oil intervals and infrequent warm-up cycles increase wear potential, making oil quality and system calibration critical.
Analysis derived from Mercedes-Benz technical bulletins (1980-1986) and UK DVSA failure statistics (1985-1995). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MERCEDES-BENZ M102920.
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