Parts for your 2006 Toyota Bb-Sump plug washers

2006 Toyota bB sumpplugwashers — are they used and what they do

Yes, the 2006 Toyota bB does use a sump plug washer. Technical references that cover the bB QNC20/QNC21 series (with K3-VE or 3SZ-VE engines) specify a replaceable crush gasket on the engine oil drain plug. Toyota’s Electronic Parts Catalog lists a “Gasket, drain plug” for this model range (commonly Toyota p/n 90430‑12031, an aluminium crush washer), and the Toyota Repair Manual (Engine Mechanical – Oil and Filter Replacement procedure for QNC2#) instructs fitting a new washer whenever the plug is refitted. Daihatsu service literature for the related 3SZ-VE also calls up a new drain plug gasket at each oil change. That’s the clear indicator that sumpplugwashers are relevant and fitted on the 2006 Toyota bB.

For this bB, the sump plug washer’s whole job is to seal the drain plug against the alloy sump so fresh oil stays in and road grime stays out. It’s a single-use, soft aluminium ring that deforms slightly as the plug is torqued, creating a tight, reliable seal without needing messy sealants. Reusing a crushed washer can lead to weeping around the plug, a dust-attracting film, and, over time, an annoying drip on the driveway.

Best practice for owners and workshops in Australia and New Zealand is simple: replace the sumpplugwashers at every service when the engine oil is changed (typically every 10,000 km or 12 months, or as per driving conditions). Stick with quality OEM-spec aluminium crush washers sized for the bB’s drain plug. If the previous owner or a quick-lube joint has been reusing washers, it’s worth grabbing a small stash so there’s always a fresh one on hand.

When changing oil on the 2006 Toyota bB, a mechanic will:

• Warm the engine so the oil drains cleanly, then remove the drain plug and old washer.
• Inspect the mating face on the sump for nicks or burrs and wipe it clean.
• Fit a new aluminium washer to the plug and install the plug, tightening to the factory torque specified in the service manual (don’t overdo it—let the crush washer do the sealing).
• Refill with the correct grade and capacity of oil, run the engine, and check for leaks.

A couple of quick tells that a new washer is overdue: a faint oil halo around the plug, a slight fuelly smell after a drive, or the need to nip the plug tighter than usual. If any of these pop up, plan a fresh washer at the next oil top-up or service. It’s a tiny, inexpensive part that protects the bB’s engine for the long haul.

Popular questions about 2006 Toyota bB sumpplugwashers

What size sumpplugwashers does a 2006 Toyota bB use?

Most 2006 Toyota bB models (QNC20/QNC21) use a 12 mm aluminium crush washer on the drain plug, commonly referenced by Toyota as 90430‑12031. Because some markets and engines can vary, the smartest move is to confirm by VIN against the Toyota parts catalogue or check the existing plug’s thread size before ordering a multi-pack.

How often should the sump plug washer be replaced on a 2006 Toyota bB?

Replace it at every oil change. The washer is designed to crush once and seal perfectly, reusing it risks seepage. If the car sees short trips or dusty conditions and you service more frequently than the standard interval, still swap the washer each time—it's cheap insurance for a tidy, leak-free sump.

What torque should the drain plug be tightened to on a 2006 Toyota bB?

Always tighten to the factory torque listed in the Toyota repair manual for your engine code. For many Toyota M12 drain plugs that figure is in the mid‑20s to low‑30s N·m range, but don’t guess—use a torque wrench and the spec for your exact variant. Over-tightening can strip threads or crush the washer unevenly, under-tightening may allow a slow leak.