Parts for your 2001 Daihatsu Terios-Sump plug washers

2001 Daihatsu Terios Sump Plug Washers — Do They Use One, What It Does, and When to Replace

Yes — the 2001 Daihatsu Terios uses a sump plug washer (also called a drain plug gasket/crush washer). This is specified in the Daihatsu Terios J100/J102 workshop manual under engine lubrication, where the drain plug is shown with a replaceable gasket and a note to renew it during oil changes. The Daihatsu Electronic Parts Catalogue for the same model lists a “gasket, drain plug” for the engine oil pan, confirming it’s a service item. Many aftermarket catalogues for the K3-series engine (used in 2001 Terios) also supply a dedicated crush washer for the oil drain plug, backing up the OEM documentation.

On a 2001 Terios, the sump plug washer is a small, soft-metal ring (usually aluminium or copper) that crushes slightly as the drain plug is torqued, forming a tight seal between the plug and the sump. It’s a simple part that does an important job — stopping weeps and drips after an oil change without needing excessive torque on the plug.

As part of routine servicing, it’s good practice to replace the sump plug washer at each oil change. Once it’s been crushed, it doesn’t spring back properly the next time, so re-using it can lead to slow leaks or, worse, over-tightening the plug to chase a seal and risking thread damage. Fresh washer, correct torque — that’s the reliable combo.

For DIYers and workshops alike, here’s the sensible approach for a Terios oil change:

• Have a new crush washer ready that matches the OEM spec for the Terios drain plug.
• Clean the sump sealing face and the plug head, ditch any old washer stuck to the plug.
• Install the new washer, refit the plug, and tighten to the workshop manual torque spec — don’t guess.
• Run the engine, then check around the plug for any weeping once warm.

Signs the old washer is past it include an oily mist around the plug, a single drip forming after a drive, or the plug needing to be cranked tighter than usual to stop a seep. Replacing the washer is cheap insurance, and it keeps the Terios tidy and leak-free — exactly what’s wanted on Aussie and Kiwi roads.

FAQs

What size sump plug washer does a 2001 Daihatsu Terios use?
Most 2001 Terios models use a crush washer sized to suit the factory drain plug for the K3-series engine, commonly a 14 mm class washer. Because variants and aftermarket plugs exist, it’s smart to match by VIN or take the old washer to the parts counter to confirm the exact inner diameter and material.

Do I need to replace the washer every oil change?
Yes, it’s recommended. The washer is designed to deform once to seal properly. Re-using it can cause minor leaks or tempt over-tightening. A new washer each service plus the correct torque keeps the sump threads healthy and the plug dry.

Can I re-use the old washer in a pinch?
If absolutely stuck, a copper washer might be re-annealed as a temporary measure, but it’s not ideal. Aluminium types shouldn’t be re-used. Best practice for the 2001 Terios is to fit a fresh, correct-spec crush washer at the next opportunity.