Parts for your 2006 Toyota Bb-Oil seals

2006 Toyota bB oil seals: what they do and when to replace them

Oil seals are absolutely used on the 2006 Toyota bB. Toyota’s service manuals for the QNC20/QNC21 bB, along with the Toyota Electronic Parts Catalogue, specify multiple oil seals: front and rear crankshaft seals, camshaft seals, and transaxle (drive shaft) oil seals. That means oilseals are relevant to every 2006 Toyota bB on the road.

On this model, oilseals keep engine oil and transmission fluid where they belong and grit where it doesn’t. The front crank seal sits behind the crank pulley, the rear main seal lives at the back of the engine by the flywheel/torque converter, camshaft seals are behind the timing cover, and the transaxle seals are at the CV shaft exits. By holding pressure and blocking contaminants, they protect bearings, timing gear, and clutches while helping the bB run clean and economical across Aussie and Kiwi kilometres.

There’s no fixed kilometre interval to swap oilseals, they’re replaced on condition. Heat, age, hard seals, and crankcase pressure can create weeps that turn into drips. Smart servicing on a 2006 Toyota bB means inspecting under the bonnet and underbody: look for oil on the crank pulley, at the bellhousing join, or around the CV stubs. If the timing chain cover is off, or the gearbox is out for a clutch or converter job, it’s good practice to fit fresh seals while access is easy.

When replacing, use quality OEM-equivalent seals, confirm the correct size for the engine code (commonly 1NZ-FE or 2SZ-FE on the bB), lightly oil the lip, and press them square to the specified depth. A seal driver or a flat drift and patience beat a hammer every time. After fitting, check the PCV/breather system so crankcase pressure doesn’t push new seals out. Clean down the area, top up with the right grade oil, and re-check after a few short trips to confirm everything’s dry.

• Tell-tale signs of a tired oilseal: oil mist on the crank pulley, clutch shudder or contamination from a rear main leak, gearbox oil on the inner CVs, burnt-oil whiff on hot days, or low oil between services.
• If a leak is minor, a watch-and-wait approach can work, but any drip that hits the driveway or the exhaust should be sorted promptly.

Popular questions about 2006toyotabb oilseals

What oilseals are fitted to a 2006 Toyota bB?

The bB uses front and rear crankshaft oil seals, camshaft oil seals, and transaxle/drive-shaft output seals. These are documented in Toyota’s bB service information and the parts catalogue for QNC20/QNC21.

Some engines may also use auxiliary shaft or pump seals, but the big hitters for leaks are the crank, cam, and drive-shaft seals.

How can someone spot a failing oilseal on a 2006 Toyota bB?

Look for fresh oil around the crank pulley, along the bellhousing seam, or wetness at the inner CV joints. A burnt-oil smell after a run or oil drops on the driveway are common flags.

Keep an eye on oil level between services, if it’s dropping, a weeping seal might be the culprit.

Is it safe to keep driving with a leaking oilseal?

Short trips may be fine with a light weep, but ongoing driving risks oil on the clutch or exhaust, or low oil level damaging the engine or gearbox.

If the leak is more than a mist, it’s best to book the bB into a workshop and sort it before it becomes a bigger, spendier problem.