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Yanmar Pistons

How to choose the right piston for your Yanmar Marine engine?

The piston is an essential part of a Yanmar Marine diesel engine. It receives combustion pressure, operates at very high temperature and transfers force to the crankshaft through the connecting rod. A worn piston, tired piston rings or an out-of-tolerance cylinder can cause loss of compression, abnormal oil consumption and a clear drop in performance.

Before ordering a piston, it is essential to identify the exact engine model, its serial number and the actual condition of the bore. Yanmar engines exist in many versions, particularly in the GM, HM, JH and related ranges. Two similar engines may use different pistons, rings or pins depending on the year and configuration.

7 item(s)

COMPLETE PISTON YANMAR SERIES GM10/20/30

RÉF. YMP22090

Yanmar piston including segment, pin and two clips.

Compatible with 75mm bore engines:

- 1GM10

- 2GM20

- 3GM30

Livraison express → Wednesday 15 July

Livraison classique → Friday 17 July

Commandez dans les

00 h 00 m 00 s

Disponible

€126.00 VAT included

€105.00 VAT excluded

PISTON YANMAR 0.50 129402-22920

RÉF. DM_CR_129402-22920 | YANMAR

Pièce non en stock.

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

Un conseiller traitera votre demande dans la journée.

On demand

€177.92 VAT included

€148.27 VAT excluded

PISTON YANMAR 2QM20 AVANT 1978 - 124750-22090

RÉF. DM_CR_124750-22090 | YANMAR

Piston Yanmar incluant la segmentation.

Compatible avec les moteurs antérieurs à mars 1978.

- 2QM - 2QM20

- 3QM - 3QM30

Pièce non en stock.

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

Un conseiller traitera votre demande dans la journée.

On demand

€223.15 VAT included

€185.96 VAT excluded

PISTON YANMAR YSB12 - YSE12 104511-22090 NLA

RÉF. DM_DI_104511-22090 | YANMAR

Yanmar piston including segmentation.

Compatible with engines:

- YSB12

- YSE12

Pièce non en stock.

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

Un conseiller traitera votre demande dans la journée.

On demand

€291.68 VAT included

€243.07 VAT excluded

PISTON YANMAR YSB8 - YSE8 104211-22090

RÉF. 104211-22090 | YANMAR

Complete Yanmar piston including segmentation.

Compatible with engines:

- YSB8

- YSE8

Pièce non en stock.

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

Un conseiller traitera votre demande dans la journée.

On demand

€215.71 VAT included

€179.76 VAT excluded

YANMAR GM SERIES PISTON

RÉF. 121000-22091 | YANMAR

Yanmar piston including segmentation.

Compatible with 72mm bore engines:

- 1GM

- 2GM

- 3GM

Livraison express → Wednesday 15 July

Livraison classique → Friday 17 July

Commandez dans les

00 h 00 m 00 s

Disponible

€142.55 VAT included

€118.79 VAT excluded

YANMAR YANMAR 2QM20 AFTER 1978 - 724790-22720

RÉF. DM_DI_724790-22720 | YANMAR

Yanmar piston including segmentation.

Compatible with engines older than March 1978.

- 2QM - 2QM20

- 3QM - 3QM30

Pièce non en stock.

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

Un conseiller traitera votre demande dans la journée.

On demand

€217.57 VAT included

€181.31 VAT excluded

7 item(s)

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Which piston oversize should you choose?

The choice of size depends on the condition of the cylinder or liner. A precise measurement must be carried out in a workshop before any order, in order to check bore wear, ovality and taper.

STD standard size: to be used when the bore is within manufacturer tolerances or when replacing a cylinder liner with a new one.
+0.25 mm repair size: suitable after light reboring, when wear exceeds tolerances but remains limited.
+0.50 mm repair size: used after more extensive reboring, generally following advanced wear, scoring or the beginning of seizure.

Important: older inch-based designations, such as +0.010" or +0.020", often correspond to repair sizes close to +0.25 mm and +0.50 mm. Always check the exact equivalence specified by the part manufacturer.

When should you replace a piston or piston rings?

Replacing a piston or piston rings is generally done during an engine rebuild, after a precise mechanical diagnosis. The most common symptoms are:

Blue smoke from the exhaust: oil is entering the combustion chamber, often because of worn or stuck piston rings.
High oil consumption: a worn piston, ring set or liner no longer ensures proper sealing.
Loss of compression: values below the workshop manual specifications indicate internal wear that needs checking.
Difficult starting: insufficient compression can make cold starting difficult, especially on a marine diesel engine.
Persistent black smoke: if the injection system is correct, poor compression can cause incomplete combustion.
Scoring, seizure marks or heat marks: a marked piston or scored cylinder requires a complete bore inspection.

Which parts should be replaced at the same time?

When working on pistons, it is recommended to replace or check several related parts. A poorly prepared partial rebuild can significantly reduce engine life.

Piston rings: always fit new rings with a new piston or during a cylinder rebuild.
Piston pin and circlips: check or replace depending on condition, to avoid play and mechanical noise.
Liner or cylinder: check the bore, ovality, scoring and surface condition before reassembly.
Connecting rod bearings: check them when dismantling the moving assembly.
Cylinder head gasket: always replace it after removing the cylinder head.
Valves and seats: check them, as a burnt or poorly sealing valve can cause similar compression loss.

Common Yanmar references

The references below are given for guidance only. Compatibility must always be confirmed with the engine serial number, manufacturer documentation or the OEM reference of the original part.

Engine series	Indicative OEM references	Possible sizes
1GM / 1GM10	121000-22500 / 172100-22400	STD depending on version
2GM20 / 2GM20F	124200-22300 / 124200-22091	STD depending on version
3GM30 / 3HM35	128370-22300	STD depending on version
JH series and other Yanmar engines	To be confirmed by serial number	STD / +0.25 / +0.50 depending on engine

Ordering the right Yanmar Marine pistons

To avoid mistakes, note the exact engine model, its serial number, the current cylinder size and the OEM reference of the part removed. If the engine has already been rebored, never order a standard piston without prior measurement.

We offer pistons, rings, pins, gaskets, liners and internal parts for Yanmar Marine engines. To confirm compatibility, contact us with your full engine information.

Find our selection of pistons and internal parts to restore compression, reliability and performance to your Yanmar Marine engine.

Oil circuit

Upper Engine

Lower Engine

Exhaust

Electrical parts

Power steering and Steering

Yanmar Pistons

How to choose the right piston for your Yanmar Marine engine?

7 item(s)

COMPLETE PISTON YANMAR SERIES GM10/20/30

PISTON YANMAR 0.50 129402-22920

PISTON YANMAR 2QM20 AVANT 1978 - 124750-22090

PISTON YANMAR YSB12 - YSE12 104511-22090 NLA

PISTON YANMAR YSB8 - YSE8 104211-22090

YANMAR GM SERIES PISTON

YANMAR YANMAR 2QM20 AFTER 1978 - 724790-22720

Which piston oversize should you choose?

When should you replace a piston or piston rings?

Which parts should be replaced at the same time?

Common Yanmar references

Ordering the right Yanmar Marine pistons