PMC Motorsport Adapter / Conversion Kit / Clutch Kit Mercedes-Benz M113 / M112 – 6-Speed Manual BMW M57N2 ZF GS6-53DZ HGU HGK E90 E91 E92 325d 330d – 240 mm / 9.45"

Important: Installing the PMC flywheel requires the automatic transmission starter ring gear / flexplate from Mercedes-Benz M113 / M112 OE A 273 030 03 12 (a2730300312) (not included in the kit).

Adapter plate allowing the mating (swap / conversion) of the Mercedes-Benz M113 petrol engine (V8 4.3 / 5.0, M113 AMG 5.4, M113K 5.4 Kompressor) or M112 (V6 2.4–3.7) to the 6-speed manual ZF GS6-53DZ HGU / HGK gearbox found in BMW M57N2 diesel models (E90 / E91 / E92 325d, 330d). The heavy-duty GS6-53DZ gearbox (rated at 1000 Nm+) is the ideal foundation for high-power builds. An excellent solution for amateur and professional motorsport, drifting, and daily performance street setups.

Planning a Mercedes-Benz M113 / M112 engine swap in your BMW (E30, E36, E46, E34, E39, E90, E91, E92, E60, E61, E81, E82, E87)? Our adapter is a dependable solution. Replace the automatic transmission with a robust BMW manual gearbox and unlock new capabilities.

PMC Motorsport adapter plates not only provide automatic-to-manual conversions for vehicles equipped with Mercedes-Benz M113 / M112 engines, but also support M113 / M112 swaps into BMW chassis as well as other platforms, such as Nissan (S13, S14, S15, PS13) or Mazda RX-7 / RX-8.

The aluminum gearbox adapter plate is engineered to make gearbox installation as straightforward as possible, avoiding radical procedures such as cutting off the entire bellhousing – only preparing a clearance pocket for the starter motor is required. Custom flywheels dedicated to PMC Motorsport adapters are CNC-machined from aluminum and feature a replaceable steel friction plate, inspected and dynamically balanced prior to dispatch. The flywheel is designed for a 240 mm BMW OE pressure plate (GS5-39DZ / GS6-53DZ / BZ BMW OE). Adapter plate thickness: 20 mm (0.78").

PMC Motorsport gearbox adapter plates are synonymous with precision and premium quality. Our design process based on 3D scanning and CMM measuring arm verification guarantees a perfect fit. Modern CNC machining ensures flawless concentric alignment between engine and transmission, which is critical for drivetrain durability.

Additional Information

Installation Instructions

Flywheel installation requires the factory automatic transmission starter ring gear / flexplate from Mercedes-Benz M113 / M112 OE A 273 030 03 12 (a2730300312) (not included in the kit). Bolt the flywheel to the crankshaft using the provided bolts. Mount the clutch fork on the lower release bearing position (if using a dual-position bearing). Use a 240 mm clutch disc with a 32.5x35-26N spline dedicated to the GS6-53DZ gearbox. A factory Mercedes-Benz M113 / M112 starter motor (OE, not included in the kit) must be used. The release bearing, clutch fork, and clutch slave cylinder are not included in the kit and remain from your existing gearbox.

Frequently Asked Questions

Which engines are compatible with this adapter?

It fits Mercedes-Benz M113 petrol engines (V8 4.3 and 5.0), M113 AMG (V8 5.4), M113K (V8 5.4 Kompressor), and M112 (V6 2.4, 2.6, 2.8, 3.2, and 3.7) – found in Mercedes W202, W203, W210, W211, W220, C208, C209, C215, R129, R230, W163, and W463 models, among others.

Which gearboxes are compatible with this adapter?

It fits the 6-speed manual ZF GS6-53DZ gearbox from BMW M57N2 diesel applications in versions HGU (THGU) and HGK (THGK) – E90 / E91 / E92 325d, 330d. The gearbox input shaft has a 32.5x35-26N spline.

Which starter ring gear must be used with the PMC flywheel?

The automatic transmission starter ring gear / flexplate from Mercedes-Benz M113 / M112 OE A 273 030 03 12 (a2730300312). The ring gear is not included in the kit.

Do I need to cut the gearbox bellhousing?

No. The adapter is specifically designed to eliminate bellhousing cutting – only a starter clearance opening must be prepared.

Which additional parts must be purchased for installation?

A 240 mm clutch pressure plate and clutch disc (32.5x35-26N), release bearing, clutch fork, and clutch slave cylinder dedicated to the GS6-53DZ gearbox, the automatic transmission starter ring gear / flexplate Mercedes-Benz OE A 273 030 03 12 (a2730300312), and an original Mercedes-Benz M113 / M112 starter motor. These parts are not included in the kit.

Which clutch pressure plate fits the PMC flywheel?

A 240 mm (9.45") BMW OE type pressure plate – from BMW M57N / M57N2 / N54 / B58 / E46 M3, Sachs XTend 3000 951 952 (M57N / M57N2), Sachs XTend 3000 951 949 (N54 / N55), or Sachs Performance 883082.001243. Aftermarket setups such as ACT / Spec / Tanaci are also commonly used – any custom pressure plate must match the BMW OE flywheel pattern (M57N / M57N2 / N54 / B58). For the GS6-53DZ gearbox, use a 240 mm clutch disc with a 32.5x35-26N spline, along with the matching release mechanism and slave cylinder.

Which release bearing position should the clutch fork be mounted on?

On the lower position of the release bearing (if using a dual-position bearing) – as illustrated in the "Installation Instructions" section.

Which starter motor should be used?

An original Mercedes-Benz M113 / M112 (OE) starter motor. The starter motor is not included in the kit.

Can I use this adapter with another BMW gearbox, e.g. GS6-53DZ HGD / JGA or GS6-53BZ?

Yes. The PMC Motorsport gearbox adapter plate itself is universal and fits most BMW gearboxes (applies to adapter plates manufactured after 2022). In case of changing the gearbox, only the flywheel and clutch disc need to be replaced.

Is this adapter compatible with the ZF 8HP automatic transmission?

Yes. The PMC Motorsport adapter plate itself is universal and fits most BMW gearboxes (applies to adapter plates manufactured after 2022). For a ZF 8HP automatic conversion, the manual flywheel is replaced with a PMC Motorsport 8HP torque converter adapter.

What is included in the kit?

Aluminum gearbox adapter plate (20 mm) with mounting bolts, custom PMC Motorsport flywheel with replaceable friction surface, crankshaft bolts, pressure plate mounting bolts, and a clutch fork pivot pin (replacement for BMW OE 21 51 1 223 328). The clutch assembly, release bearing, clutch fork, and slave cylinder are not included – they should be selected to match your gearbox.

Can I buy just the adapter plate or just the flywheel?

Yes. Every component of the kit is available individually.

Does the price include customs duties for orders outside the EU?

No. Product prices and shipping charges do not include customs duties, import tariffs, or local clearance charges applicable in the destination country.

Can I order with 0% VAT?

Yes, for B2B customers outside Poland with an active EU VAT number (validated in VIES) or for orders exported outside the European Union.

Are the included instructions sufficient for completing the installation?

The manual covers physically mating the engine to the transmission outside the chassis. Depending on the car, custom modifications may be needed: engine mounts, crossmembers, firewall clearance, transmission tunnel adjustments, and driveshaft length. Professional installation is recommended.

Please note that a lightweight rigid flywheel provides uncompromising throttle response by eliminating factory dual-mass damping elements. This yields a direct mechanical connection, which may naturally increase gearbox rollover noise at idle. This is an expected characteristic in performance vehicles equipped with rigid flywheels.