Parts for your 2012 Daihatsu Bego-Sump plug washers

2012 Daihatsu Bego sump-plug-washers — what they do and when to replace them

Yes, a sump-plug-washer is used on the 2012 Daihatsu Bego. Technical references including the Daihatsu/Toyota J200/J210 (Terios/Rush) workshop literature for the 3SZ-VE engine and the Toyota Electronic Parts Catalogue for the Rush/Terios platform specify a crush-type drain plug gasket on the engine oil pan. In Toyota/Daihatsu documentation this is listed as a 12 mm drain plug gasket (commonly supplied as an aluminium crush washer under Toyota p/n 90430‑12028 or its supersession). That means the sump-plug-washer is very much relevant to routine servicing on the 2012 Bego.

The sump-plug-washer’s job is simple but critical: it deforms slightly when the drain plug is torqued, creating a reliable seal between the plug and the sump. That crush action prevents weeping and drips, maintains correct clamping load without over-tightening, and protects the alloy sump face from damage. On the Bego’s 3SZ-VE 1.5‑litre engine, using the correct washer helps keep the engine bay tidy, oil where it belongs, and the service experience drama-free.

Best practice during an oil change is to replace the sump-plug-washer every time the plug is removed. Aluminium crush washers are designed as single-use items, reusing them can lead to poor sealing and the temptation to overtighten the plug. If copper is supplied as an alternative, it can sometimes be annealed, but for this model it’s smarter to fit a fresh OEM‑equivalent washer. Clean the mating surfaces, thread the plug by hand, then torque to the workshop spec for the 3SZ‑VE (typically around the low‑30s Nm range—always check the exact figure for the vehicle variant). After refilling, inspect for any weeping after a short drive.

• Use the correct size: 12 mm ID crush washer for the Bego’s engine sump.
• Replace at every oil change, or any time the plug is removed.
• Avoid reusing old washers, it risks leaks and sump face damage.
• If the plug or sump face is marked or burred, address that before fitting the new washer.
• After service, check for any oil traces around the plug—fix immediately to avoid contamination and low oil level.

Getting the right little washer is cheap insurance. It keeps the 2012 Daihatsu Bego sealed up properly and makes the next service that much easier.

Popular questions about 2012 Daihatsu Bego sump-plug-washers

What size sump-plug-washer does a 2012 Daihatsu Bego use?
The Bego (J200/J210 platform with the 3SZ‑VE engine) typically uses a 12 mm internal diameter aluminium crush washer. Parts catalogues for the Toyota Rush/Daihatsu Terios list an OEM-style 12 mm gasket (often referenced as Toyota 90430‑12028 or equivalent). Always match by VIN if uncertain.

How often should the sump-plug-washer be replaced?
Swap it at every oil change. The alloy washer is single-use and is designed to deform once to seal. Replacing it each time helps avoid weeping, stripped threads from over-tightening, and messy undertrays.

Can the old washer be reused if it looks fine?
It’s not recommended. A used crush washer doesn’t spring back, so it won’t seal as reliably the second time. For a low-cost part, fitting a fresh washer is the safer call—especially on an alloy sump where you don’t want to chase extra torque to “make it seal”.