Parts for your 2013 Daihatsu Bego-Sump plug washers

2013 Daihatsu Bego sump‑plug‑washers: what they do and when to replace them

For the 2013 Daihatsu Bego (J200/J210 series with the 3SZ‑VE 1.5‑litre engine), a sump plug washer is absolutely used and relevant. Technical documentation from the Daihatsu Terios/Bego service manual set and the Toyota Rush (the Bego’s twin) repair manual specifies an aluminium crush gasket on the engine oil drain plug. Commonly referenced genuine gasket is Toyota P/N 90430‑12031 (12 mm aluminium crush washer). These manuals also call up a drain plug torque around 39–40 N·m, which assumes a fresh crush washer to seal correctly.

What’s the point of the washer? It’s a soft, single‑use seal that deforms as the plug is tightened, filling tiny imperfections between the plug face and sump. That’s how it prevents those annoying drips that leave spots on the driveway and slowly lower oil level. On the Bego’s alloy sump, the correct washer also spreads the load so the sealing face isn’t gouged or warped by over‑tightening.

As part of routine servicing, it’s smart practice to replace the sump‑plug‑washer at every oil change. Re‑using a flattened washer can lead to weeping, the temptation to over‑torque the plug, or both. A new aluminium washer is inexpensive, and it helps keep the specified torque meaningful. If oil has been weeping around the plug, the washer is the first suspect before blaming the plug threads or sump.

• When changing oil, clean the plug and sump seat, fit a new 12 mm aluminium crush washer, and tighten the plug to 39–40 N·m using a torque wrench.
• If the old washer has bonded to the sump, gently remove it without scratching the sealing face.
• After refill, run the engine, shut it down, and check for leaks once more after a short drive.

Tech sources that back this up include the Daihatsu Terios/Bego J2xx service manuals and the Toyota Rush 3SZ‑VE repair literature, which consistently specify an aluminium drain plug gasket and the above torque. So yes, the 2013 Bego is designed to run a crush‑type sump plug washer, and replacing it with each service is the reliable, no‑dramas way to keep the system sealed.

What size washer does the 2013 Daihatsu Bego use?

It uses a 12 mm aluminium crush washer on the engine oil drain plug, commonly cross‑referenced in Toyota/Daihatsu catalogues (e.g., Toyota 90430‑12031). Sticking with the correct size ensures the washer deforms properly and seals first go.

How often should the sump‑plug‑washer be replaced?

Best practice is every oil change. Aluminium crush washers are single‑use by design, once compressed, they won’t spring back to seal reliably a second time. Replacing it helps the plug hit the correct torque and seal without over‑tightening.

What happens if the washer is re‑used or missing?

You’ll often see slight weeping or a slow drip. To compensate, many people over‑tighten the plug, which risks damaging threads or distorting the sump face. A fresh washer and the correct 39–40 N·m torque avoids those headaches.