MerCruiser flywheel

MerCruiser flywheel

What are the symptoms of a fault in this area?

The flywheel is a key component of your Mercruiser inboard. It smooths engine rotation, drives the starter through its ring gear and supports the transmission coupler, or flexible coupling. DAM Marine offers a complete selection of flywheels and ring gears for maintaining your engine block.

The flywheel is not just a simple cast-iron mass and, depending on the noise your boat makes, the faulty part may differ. For example, if the starter slips, grinds or spins freely, the ring gear teeth are usually chipped. Because the defect is often in the same place, it appears depending on the engine's stopping position.

Be careful with the most common confusion in marine mechanics: a metallic rattle at idle that disappears when accelerating indicates wear in the coupler, or flexible coupling, not in the flywheel. However, a sudden vibration should alert you to a potentially cracked flywheel or loose fasteners, a situation that must be checked urgently. Finally, a sharp knock when shifting between gears often indicates excessive play in the coupling.

Read more about Flywheels Mercruiser

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COURONNE VOLANT MOTEUR GM...

COURONNE VOLANT MOTEUR GM V6-V8

RÉF. 168S

Couronne de volant moteur diamètre 35.6 cm disposant de 168 dents pour moteur base GM.

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FORD FLYWHEEL CROWN

FORD FLYWHEEL CROWN

RÉF. 416/121

Flywheel crown for Ford base 5 and 5.8 liters.

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GM BB V8 FLYWHEEL - 1PCS

GM BB V8 FLYWHEEL - 1PCS

RÉF. FW118

Flywheel with an external diameter of 36cm and 168 teeth for a 7.4 litre - 8.2 litre GM-based V8 engine AFTER 1990 with a 1PCS one-piece crankshaft oil seal.

Generation V and VI engine.

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GM V8-V6 FLYWHEEL - 2PCS

GM V8-V6 FLYWHEEL - 2PCS

RÉF. FW100

Flywheel with an external diameter of 36cm and 168 teeth for GM base V6 - V8 engines before 1990 with a 2-piece crankshaft oil seal.

Steering wheel inner diameter - centering: 63mm

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V6 MPI FLYWHEEL - 1PCS

V6 MPI FLYWHEEL - 1PCS

RÉF. FW110

Flywheel with an external diameter of 36cm and 168 teeth for V6 multi-point injection engines of the MPI or GXI types as well as Vortec.

Steering wheel inner diameter - centering: 52mm

This flywheel has a notch in the casting unlike the FW109 reference.

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VOLANT MOTEUR 4CYL GM - 1PCS

VOLANT MOTEUR 4CYL GM - 1PCS

RÉF. FW401

Volant moteur de diamètre extérieur 36cm disposant de 168 dents pour moteur 4 cylindres base GM APRES 1990 disposant d'un joint spi de vilebrequin en un morceau 1PCS.

Diamètre intérieur volant - centrage : 52mm

Pièce non en stock.

Demandez le délai de réapprovisionnement et le tarif en cliquant sur le bouton « Ask for a quote ».

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VOLANT MOTEUR V8 GM BB - 2PCS

VOLANT MOTEUR V8 GM BB - 2PCS

RÉF. FW101

Volant moteur de diamètre extérieur 36cm disposant de 168 dents pour moteur V8 7.4 litres - 8.2 litres base GM AVANT 1990 disposant d'un joint spi de vilebrequin en 2 morceaux 2PCS.

Moteur de génération IV.

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VOLANT MOTEUR V8-V6 GM - 1PCS

VOLANT MOTEUR V8-V6 GM - 1PCS

RÉF. FW109

Volant moteur de diamètre extérieur 36cm disposant de 168 dents pour moteur V6 - V8 base GM APRES 1990 disposant d'un joint spi de vilebrequin en un morceau 1PCS.

Diamètre intérieur volant - centrage : 52mm

Pour les moteurs V6 VORTEC merci de confirmer que vous ne disposez pas du montage type FW110 disposant de l'encoche dans la fonderie.

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Should you replace only the ring gear or the complete Mercruiser flywheel?

If only the teeth are damaged, the starter ring gear can be replaced separately. As it is heat-shrunk onto the flywheel, the operation requires a reasonably equipped workshop, or a good torch, but it remains the most economical option. The complete flywheel is mandatory if it shows cracks, signs of imbalance or damaged coupler mounting threads.

As for the coupler, or flexible coupling, it is replaced independently of the flywheel to solve idle rattling noises. Note, however, that this operation requires moving the engine back to disconnect the sterndrive, whether it is an Alpha or Bravo drive.

How do you choose the right Mercruiser flywheel?

To order the correct reference without mistakes, you need to identify several characteristics of your engine. First note the architecture of your engine block, 4-cylinder, V6 or V8, as well as its displacement and production year, because marinised GM blocks evolved over the decades, especially around the rear crankshaft seal. Also count the number of ring gear teeth, very often 153 or 168 teeth on V8 engines, a crucial point to ensure compatibility with your starter.

What installation advice should you remember?

When refitting, there is some reassurance: on most GM/Mercruiser blocks, the crankshaft mounting holes are asymmetrical or use a locating feature. You therefore cannot install the flywheel backwards and upset engine balance.

During installation, make sure the crankshaft mating surface is perfectly clean, as the smallest impurity will create runout. Respect the specified tightening torque carefully and use threadlocker or new fasteners if the manual requires it. Finally, the mechanic's advice: use this removal to inspect, or even replace preventively, the rear crankshaft oil seal, which is completely inaccessible the rest of the time.