Yanmar Pistons

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Yanmar Pistons

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

The piston is an essential component of the Yanmar Marine diesel engine. It receives the combustion pressure, operates at very high temperatures and transfers force to the crankshaft via the connecting rod. A worn piston, tired piston rings or a cylinder outside tolerance can lead to loss of compression, abnormal oil consumption and a clear drop in performance. Before ordering a piston, it is essential to precisely identify the engine model, its serial number and the actual condition of the bore. Yanmar engines exist in many versions, particularly in the GM, HM, JH ranges and their derivatives. Two similar engines may use different pistons, rings or pins depending on the year and configuration.

8 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 → Friday 29 May

Livraison classique → Tuesday 02 June

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

PISTON YANMAR YSM8 - NLA

RÉF. 724070-22720 | YANMAR

Complete piston with ring for Yanmar YSM8 series engine.

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

€167.36 VAT included

€139.47 VAT excluded

YANMAR GM SERIES PISTON

RÉF. 121000-22091 | YANMAR

Yanmar piston including segmentation.

Compatible with 72mm bore engines:

- 1GM

- 2GM

- 3GM

Livraison express → Friday 29 May

Livraison classique → Tuesday 02 June

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

8 item(s)

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Which piston size should you choose? The choice of size depends on the condition of the cylinder or liner. A precise measurement must be carried out in the workshop before any order, in order to check the wear, ovality and taper of the bore. Standard size STD: to be used when the bore is within manufacturer tolerances or when replacing a cylinder liner with a new one. Repair oversize +0.25 mm: suitable after light reboring, when wear exceeds tolerances but remains limited. Repair oversize +0.50 mm: used after more significant reboring, generally following advanced wear, scoring or the beginning of piston seizure. Important: old inch designations, such as +0.010" or +0.020", often correspond to repair oversizes close to +0.25 mm and +0.50 mm. Always check the exact correspondence indicated by the part manufacturer. When should a piston or piston rings be replaced? A piston or piston ring replacement is generally carried out during an engine overhaul, after a precise mechanical diagnosis. The most common symptoms are: Blue smoke from the exhaust: oil rises into the combustion chamber, often due to worn or stuck piston rings. High oil consumption: a worn piston, piston ring set or liner no longer ensures proper sealing. Loss of compression: values below workshop manual recommendations indicate internal wear that must be checked. 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 or heat marks: a marked piston or scored cylinder requires a full bore inspection. Which parts should be replaced at the same time? During work on pistons, it is recommended to replace or check several associated parts. A poorly prepared partial overhaul can greatly reduce engine service life. Piston rings: always fit new rings with a new piston or during cylinder overhaul. Piston pin and circlips: to be checked or replaced depending on condition, in order to avoid play and mechanical noise. Liner or cylinder: check the bore, ovality, scoring and surface condition before reassembly. Connecting rod bearings: to be checked when dismantling the rotating assembly. Cylinder head gasket: must be replaced systematically after removing the cylinder head. Valves and seats: to be checked, as a burnt or poorly sealed valve can cause a similar loss of compression. Common Yanmar references The references below are provided for information 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 your Yanmar Marine pistons correctly To avoid any mistake, note the exact engine model, its serial number, the current cylinder size and the OEM reference of the removed part. 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 the complete information for your engine. Discover our selection of pistons and internal parts to restore compression, reliability and performance to your Yanmar Marine engine.

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Yanmar Pistons

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

8 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

PISTON YANMAR YSM8 - NLA

YANMAR GM SERIES PISTON

YANMAR YANMAR 2QM20 AFTER 1978 - 724790-22720