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Yanmar Turbochargers

A worn turbocharger on a Yanmar diesel can show up as smoke, slow spool, oil in the intake, or a drop in power under load. This collection covers turbochargers used on Yanmar marine engines, helping you choose the correct replacement by matching the key fitment details.

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What information should I check to confirm a Yanmar turbocharger?

Use your engine model, then locate the turbo part number on the housing or ID tag. Confirm cooling type (oil-only or oil and water) and note where the ports sit. Check flange type and stud pattern on the manifold and exhaust outlet, and take photos of the housings and actuator if fitted. Turbo variants can differ within the same Yanmar engine family, so part number confirmation is the safest way to match correctly.

Is a CHRA suitable for a Yanmar turbo repair?

A CHRA can be suitable when the housings are undamaged and the correct cartridge spec is available. If the housings are cracked, badly corroded, or damaged at sealing faces, a complete turbocharger is usually the safer option. If you are considering a CHRA, confirm what the product includes, and make sure the turbo part number matches. Assembly should be done carefully, as incorrect alignment or contamination can lead to smoke or early failure.

What should I check if I have smoke after fitting a turbocharger?

First, check for oil leaks at the feed and return connections and make sure the oil return is free-flowing, as restriction can push oil into the turbo. Inspect the intake hoses for oil residue from the previous failure, as leftover oil can burn off and look like a new problem. Check that boost control connections are correct if an actuator is fitted. Also confirm there are no intake leaks and the air filter is clear, as poor airflow can affect combustion and smoke levels.

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Yanmar turbocharger selection, made simpler

Part number and serial are the fastest route to the right turbo

Yanmar engines can use different turbo variants across production runs. The turbo part number plus engine serial is the most reliable way to match specification. If you cannot access the number, take clear photos of the compressor housing, turbine housing, flanges, and cooling ports. This beats guessing by engine family name and reduces the chance of ordering a unit that does not align with your manifold or pipework.

Cooling, flanges, and orientation decide whether it bolts up

Before ordering, confirm whether your turbo is oil-cooled only or oil and water cooled, and match port layout. Compare flange shape, stud pattern, and the orientation of inlet and outlet connections. If an actuator is used, check its type and mounting. These details prevent installation delays and avoid having to modify pipework to make a turbo fit.

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Installation checks that protect the new turbo

Turbochargers depend on clean oil flow. Inspect and clear oil feed and return lines, replace seals and gaskets as required, and check the intake tract for debris if the old turbo failed. Confirm air filters are clean and there are no intake leaks. After fitting, check for oil leaks and confirm boost control connections, as small issues can cause smoke, overspeed, or poor performance.

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