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Yanmar 3JH40 Oil & Filter Change

Marine maintenance guide · Reviewed by the AI Boat Buddy team · Fitment cross-referenced from OEM parts catalogs

Fresh oil and a new filter are the cheapest insurance for your Yanmar 3JH40. Below is the oil filter we recommend, which 3JH40 variants it fits, a step-by-step video of the full oil change, and what else you need for the job.

✓ Recommended for the Yanmar 3JH40
119305-35170 — Oil filter
Fits the 3JH40.
Our parts catalogue lists this as YAN119305-35170, and the fitment above is recorded against that number — but it is a catalogue reference retailers do not stock. 119305-35170 is the cross-reference it is sold under, and it is what the button searches for. Both are on the compatibility list below.

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✓ Fitment cross-referenced from OEM catalogs · ✓ Step-by-step video above · ✓ Fast Amazon shipping & easy returns — verify your model code before ordering

Watch: how to do it (step by step)

About the video: it shows this job on another Yanmar diesel engine — not specifically the 3JH40. The procedure is broadly similar, but part locations and torque specs differ, so always check the 3JH40 workshop manual. The part numbers on this page are specific to the 3JH40.

How to replace the oil filter on a Yanmar 3JH40

How to Change the Oil and Gauze Filter on a Yanmar L48N Engine | L&S Engineers

Tools Needed

  • 17mm spanner
  • 10mm spanner
  • Pliers

Safety

  • Ensure the engine is cool before starting any work.
  • Be cautious when handling oil to avoid spills.

Steps

  1. Unscrew the oil fill cap to check the oil level.
  2. If the oil level is below the suggested mark, top it up with the correct oil for your engine.
  3. To change the oil, unscrew the 70ml oil drain plug using a 17mm spanner.
  4. Allow the engine oil to drain completely.
  5. Inspect the drain plug seal and replace it if necessary.
  6. Screw the drain plug back in securely to prevent leaks.
  7. Unscrew the 10mm bolt that holds the gauze filter using a 10mm spanner.
  8. Remove the gauze filter using pliers.
  9. Inspect the gauze filter for any debris or blockages.
  10. Check the seals on the gauze filter for any wear or damage.
  11. If the seals are damaged, replace the gauze filter.
  12. Place the gauze filter back into the engine.
  13. Screw the gauze filter back into position.
  14. Tighten the 10mm bolt to ensure there is no movement.

Tips

  • Use the right oil for your engine.
  • Fill the oil responsibly to avoid overfilling.
  • Inspect the seals regularly to prevent leaks.

Which part do I need for my Yanmar 3JH40?

For most 3JH40 owners the part above (YAN119305-35170) is the right choice.

Frequently asked questions

What oil filter fits a Yanmar 3JH40?

The Yanmar 3JH40 uses the oil filter sold as 119305-35170. Confirm the number against your engine's model code and year plate before ordering.

How often should I replace the oil filter on a Yanmar 3JH40?

Change the oil and filter every 100 running hours or once a season, whichever comes first (check your manual for the exact interval).

What else do I need for an oil change on a Yanmar 3JH40?

The correct grade and amount of engine oil (see the manual), a new drain-plug washer, a filter wrench and a drain pan or oil extractor pump. Nothing exotic — it is standard service equipment.

What are the signs the oil is overdue on a Yanmar 3JH40?

Dark, gritty oil well past its interval, low-pressure warnings — and milky or grey oil, which means water is getting in and should be investigated immediately.

How long does an oil change take on a Yanmar 3JH40?

About an hour for a competent DIYer. Run the engine warm first — warm oil drains faster and carries more contaminants out with it.

Ready to fix it?
Get the 119305-35170 oil filter for your Yanmar 3JH40.

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As an Amazon Associate we earn from qualifying purchases — at no extra cost to you. Prices and availability are shown at checkout. This guide is for reference; always follow the engine manufacturer’s service manual.