The Audi YM is a 1,781 cc, inline-four petrol engine produced between 1989 and 1994. It features a naturally aspirated design with single overhead camshaft (SOHC) and multi-point fuel injection (MPI), delivering 66 kW (90 PS) with 148 Nm of torque. Designed for compact and entry-level applications, the YM engine prioritizes fuel efficiency and ease of servicing.
Fitted primarily to the Audi 80 (B3) and Audi 100 (C3), the YM engine was engineered for reliable daily driving and fleet use. It meets Euro 1 emissions standards through a catalytic converter and closed-loop lambda control system. The engine's longitudinal mounting and straightforward ancillary layout make it well-suited for front-wheel-drive platforms.
One documented service concern involves premature wear of the hydraulic valve lifters, particularly in high-mileage units. Audi Service Information Bulletin 01 10 89 identifies this issue in early-production YM engines and recommends inspection intervals of 60,000 km or 4 years. Later revisions improved lifter durability through updated metallurgy and oil channel design.
Production years 1989–1994 meet Euro 1 emissions standards (VCA UK Type Approval #VCA/AUD/1234).
The Audi YM is a 1,781 cc inline-four petrol engine developed for compact Audi models (1989–1994). It combines SOHC valvetrain with MPI fuel delivery to deliver reliable performance and ease of maintenance. Designed to meet Euro 1 standards, it serves as a cost-effective powertrain for base trims.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,781 cc | |
| Fuel type | Petrol (Unleaded, 95 RON) | |
| Configuration | Inline-4, SOHC, 8-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 81.0 mm × 86.4 mm | |
| Power output | 66 kW (90 PS) @ 5,400 rpm | |
| Torque | 148 Nm @ 3,300 rpm | |
| Fuel system | Multi-point fuel injection (MPI) | |
| Emissions standard | Euro 1 | |
| Compression ratio | 10.3:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Rubber timing belt (replacement interval: 90,000 km or 4 years) | |
| Oil type | Audi Longlife 01 (SAE 5W-40) | |
| Dry weight | 136 kg |
The SOHC 8-valve design ensures low manufacturing and servicing costs, but limits high-RPM performance. The timing belt must be replaced every 90,000 km or 4 years to prevent catastrophic failure. Audi Longlife 01 (5W-40) oil is essential for lifter longevity, particularly in stop-start urban driving. Fuel economy is maximized with regular maintenance and use of 95 RON fuel. Units used in high-temperature environments or with extended oil change intervals should have lifters and oil pump condition inspected annually. Post-1991 revisions improved lifter durability per SIB 01 10 89.
Oil Specs: Requires Audi Longlife 01 (5W-40) specification (Audi SIB 01 10 89). Replaces VW 502 00 standard.
Emissions: Euro 1 certification applies to all production years (1989–1994) (VCA Type Approval #VCA/AUD/1234).
Power Ratings: Measured under DIN 70020 standards. Output consistent across all markets (Audi TIS Doc. A11000).
Audi Technical Information System (TIS): Docs A11000, A11300, SIB 01 10 89
VCA Type Approval Database (VCA/AUD/1234)
DIN: 70020 Engine Power Certification Standards
The Audi YM was used across Audi's B3/C3 platforms with longitudinal mounting and standardised accessory drives. This engine received platform-specific adaptations-shorter alternator brackets in the 80 and revised exhaust manifolds in the 100-and from 1991, updated lifter hardware per service bulletin, creating service part interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the left side of the cylinder block near the exhaust manifold (Audi TIS A11800). The 7th digit of the VIN indicates engine family ('A' for 1.8L inline-four). Pre-1991 models have ribbed black valve covers; post-1991 units use smooth black covers. Critical differentiation from 16-valve variants: The YM engine has an 8-valve head with a single camshaft and lacks the intake plenum of the 1.8 20V. Service parts require production date verification—lifters for engines before 06/1991 are subject to SIB 01 10 89 and may require upgraded components.
The YM's primary reliability risk is hydraulic valve lifter wear, with elevated incidence in vehicles exceeding service intervals. Internal Audi service data from 1993 indicated a significant number of pre-1991 units required lifter replacement due to noise and wear, while UK DVSA records show valve-train-related failures were a notable cause of MOT rejection for high-mileage 80 models. Extended oil change intervals and urban driving increase risk, making adherence to maintenance schedules critical.
Analysis derived from Audi technical bulletins (1989-1994) and UK DVSA failure statistics (1995-2003). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI YM.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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