The drain plug washer on most Honda CR‑V models is a copper crush washer sized to seal the drain plug; in practice, the typical outer diameter is about 17 mm. The exact size, however, depends on the engine variant and model year.
The term "oil washer" can refer to the copper drain plug crush washer or to a sealing O‑ring for the oil filter housing; they are not interchangeable. This article focuses on the drain plug washer used when you change the engine oil.
Understanding the oil drain plug washer
In order to ensure a proper seal and prevent leaks, you should match the washer to the drain plug and the engine design. Honda may specify different washer part numbers for different CR‑V generations, so check OEM data for your VIN.
Here are steps to confirm the correct size for your vehicle:
- Check the owner's or service manual for the recommended oil drain plug washer size or OEM part number.
- Inspect the existing washer or drain plug to measure the outer diameter and inner hole size (the hole should fit the drain bolt snugly).
- When replacing, purchase a copper crush washer sized to fit Honda's drain plug (most CR‑V applications use a washer in the 15–18 mm outer diameter range). If unsure, buy a small pack of washers that cover common Honda sizes and select the one that seals correctly.
To confirm the correct washer size for your CR‑V, use the following checks:
Reliable sealing depends on using a fresh copper crush washer rather than reusing an old one, and ensuring the drain plug torques to the manufacturer's specification.
How to replace the oil drain plug washer
Use the following steps to replace the washer safely and correctly:
- Drain the engine oil and remove the drain plug using the appropriate socket.
- Remove the old copper washer and clean the drain plug and drain hole threads.
- Install a new copper crush washer on the drain plug or into the drain hole, depending on your vehicle’s design.
- Reinstall the drain plug and torque to the manufacturer's specification, then refill engine oil and check for leaks.
Always refer to the specific service data for your CR‑V model year to confirm torque values and washer size.
Summary
In most Honda CR‑V applications, the oil drain plug uses a copper crush washer with an outer diameter around 17 mm, but the exact size can vary by engine and year. When in doubt, consult the service manual or OEM parts catalog for your VIN and replace with the correct washer to ensure a proper seal.