BMW F30 B48 Engine Flywheel 8612144 - Used Original Parts

Quick Answer

A worn flywheel is the right fix when an F30 with the B48 engine and manual gearbox has a rattle at idle, a shudder on take-off, or a clutch that judders even though the clutch disc and pressure plate are healthy. Fitting a tested used original dual-mass flywheel makes sense in Malaysia because stop-and-go traffic wears these units out, a new Genuine one costs far more than the job justifies, and a properly inspected used unit still has plenty of life left. Replacing it together with a fresh clutch kit avoids paying for the gearbox removal twice.

Diagnosis and Common Symptoms

The B48 flywheel in the F30 (320i and 330i manual) is a dual-mass design. A primary mass bolted to the crankshaft is coupled through arc springs and grease to a secondary mass that carries the clutch. Its job is to absorb the strong torsional pulses of a turbocharged 4-cylinder before they reach the gearbox. Once the springs, bearing or grease chamber wear out, the symptoms usually follow this pattern:

• Metallic rattle or chatter at idle, which often goes away when the clutch pedal is pressed.
• Shudder or judder when pulling away from a stop, worst between 1,000 and 1,500 rpm.
• Vibration through the pedal, gear lever or floor at low rpm.
• Clunking or knocking on throttle lift-off and during gear changes.
• Rough or lumpy idle and a droning sound when engine braking in higher gears.
• Clutch slip or a burning smell from a flywheel friction surface that is heat-spotted, scored or cracked.
• Grinding on starting if the ring gear teeth are damaged.

A flywheel normally does not store its own fault code, and the dashboard stays quiet. In some cases a severe vibration or an irregular idle can lead to misfire entries (P0300 series) or rough-running complaints. These point to the flywheel only after ignition, injectors and engine mounts have been ruled out. The correct diagnosis comes from a road test, a check of the noise at idle with the clutch pressed and released, and measuring the free play between the two masses once the gearbox is removed.

Introduction

This is a Genuine Used BMW flywheel removed from an F30 with the B48 engine, and it has been inspected and tested before sale. We check the friction surface for heat checking and scoring, the ring gear for damaged teeth, and the dual-mass play and rotation for excessive free movement or grease leakage. As a used original part, it keeps the exact weight, damping characteristics and bolt pattern BMW engineered for this engine. A tested unit like this gives you Genuine quality without paying the price of a brand-new one.

Product Details

• Brand: BMW
• Model Compatibility: BMW F30 3 Series with B48 engine and manual gearbox (such as 320i and 330i). Please confirm the match by part number 8612144.
• Part Name: Flywheel (Dual Mass Flywheel)
• Condition: Genuine Used (Tested Working)
• Notes: Replace the clutch disc, pressure plate and release bearing at the same time. Use new flywheel bolts, as the originals are single-use stretch bolts. Check the crankshaft rear main seal and the gearbox input shaft seal for leaks while the gearbox is out. Clean the crankshaft mating face and tighten to the factory torque specification.