Parts for your 2006 Toyota Bb-Oil seals

2006 Toyota bB oil seals — purpose, checks, and when to replace

Oil seals are absolutely used on the 2006 Toyota bB. Technical references including Toyota’s Service Information (TIS) Repair Manual for the bB QNC20/21/25 series and the Toyota Electronic Parts Catalog list multiple oil seals on this model: front and rear crankshaft oil seals, camshaft oil seals, transaxle/axle (drive shaft) oil seals, and other shaft seals. These factory manuals outline inspection and replacement procedures, confirming their relevance on every engine and driveline fitted to the 2006 bB.

On this model, oil seals keep engine oil, gearbox fluid and diff oil where they belong while keeping grit and moisture out. Around the engine, seals ride the ends of the crankshaft and camshafts, in the driveline, they sit where the drive shafts exit the transmission. The bB’s engines of the era (as detailed in Toyota TIS) use chain-driven cams and rely on correctly installed seals to hold pressure and prevent messy leaks onto the timing cover, undertray and driveway.

Because oil seals are wear items, they’re checked during routine servicing rather than replaced by kilometre alone. A workshop will look for dampness or fresh oil at the crank pulley area, the bellhousing lip (rear main), around the timing cover, and at the CV stubs of the transaxle. Drivers might notice oil spots under the car, a burning-oil whiff after a run, or greasy build-up around the lower engine. If any of that shows up, it’s time to plan a seal job.

• Replace seals proactively when related work is already happening (e.g., front seal during crank pulley or timing cover work, rear main during clutch or transmission removal, axle seals during CV replacement).
• Use quality OEM-equivalent seals (FKM/Viton where specified) and lightly oil the lip before installation. Press squarely to the service manual depth and torque surrounding fasteners to spec.
• Clean mating surfaces, check the PCV/breather system to prevent crankcase pressure build-up, and inspect for groove wear on the shaft, use a repair sleeve if needed.

Toyota’s Repair Manual and EPC back all of the above by listing the exact seal locations and procedures for the 2006 bB. Keeping those seals healthy protects the engine, helps the gearbox shift happily, and saves on oil top-ups — all wins for a tidy, reliable city box.

Where are the main oil seals on a 2006 Toyota bB?

They’re at the front and rear of the crankshaft, on the camshafts behind the timing cover, and at the transmission where the drive shafts exit. Workshops also check ancillary shaft seals called out in Toyota’s TIS for the model.

How can someone tell a rear main seal leak from an oil pan or rocker cover leak?

A rear main leak tends to appear at the bellhousing join and may drip from the lower inspection area. Pan or cover leaks usually track down the block. A UV dye test and a proper clean-and-recheck are standard workshop methods to be sure before booking the big job.

Should oil seals be replaced as preventative maintenance?

They’re generally replaced on condition. That said, it’s smart to fit new seals when nearby work is already being done — for example during transmission removal or timing cover service — because labour overlaps make it cost-effective.