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Yanmar 4JH45 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 4JH45. Below is the exact oil filter that fits, a step-by-step video of the full oil change, and what else you need for the job.

✓ Recommended for the Yanmar 4JH45
YAN129150-35170 — OIL FILTER

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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 4JH45. The procedure is broadly similar, but part locations and torque specs differ, so always check the 4JH45 workshop manual. The part numbers on this page are specific to the 4JH45.

How to Replace Oil Filter – Yanmar 2GM20

Yanmar Oil & Filter Change

Tools Needed

  • Oil filter kit for Yanmar 2GM20
  • Oil pump
  • Paper towels or rags
  • New oil

Safety

  • Ensure the engine is warm before starting the oil change.
  • Be prepared for some oil spillage during the process.

Steps

  1. Run the engine at 1600 RPM for about five minutes to warm the oil.
  2. Place a bag or container under the oil filter to catch any spilled oil.
  3. Remove the oil filter by hand, it should be hand-tight.
  4. Apply new oil to the O-ring on the new oil filter.
  5. Install the new oil filter by hand and tighten it securely.
  6. Insert the oil pump into the dipstick hole and pump out the old oil.
  7. Once the oil pump stops suctioning, remove it and add new oil using a flexible funnel.
  8. Run the engine for a few minutes and check the oil level using the dipstick.
  9. Add more oil if necessary, aiming for the middle of the dipstick.

Tips

  • The kit only provided one quart of oil, but the engine required more than one and a half quarts.
  • The process can be completed in under 30 minutes with the right tools.
  • Recycle the old oil and filter responsibly.

Which part do I need for my Yanmar 4JH45?

For most 4JH45 owners the part above (YAN129150-35170) is the right choice.

Frequently asked questions

What oil filter fits a Yanmar 4JH45?

The Yanmar 4JH45 uses the oil filter sold as YAN129150-35170. 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 4JH45?

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 4JH45?

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 4JH45?

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 4JH45?

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 YAN129150-35170 oil filter for your Yanmar 4JH45.

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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.