Parts for your 2004 Toyota Bb-Engine mount

2004 Toyota bB engine-mount — what it does and when to replace it

From Toyota’s technical literature for the NCP30/NCP31 bB platform (and the mechanically equivalent 2004 Scion xB), including the Engine/Engine Mechanical “Engine Mounting” section of the repair manual and the Toyota Electronic Parts Catalogue (EPC), this vehicle is fitted with multiple engine/transaxle mounting insulators. So yes — an engine mount is absolutely relevant and used on the 2004 Toyota bB.

The engine mounts on a bB do a simple but critical job: they hold the engine and transaxle in the right spot while soaking up vibration and controlling the twist of the 1NZ-FE/2NZ-FE under throttle. By isolating vibration, they keep the cabin calm, protect driveline components, and help the car feel tidy on take-off and during gear changes.

On this model, there are typically four mounts working as a team:

• Right-hand (engine-side) mounting insulator
• Left-hand (transaxle-side) mounting insulator
• Front torque/roll mount
• Rear engine/trans mount

Tell-tale signs they’re on the way out include extra vibration at idle, a thud or clunk when shifting from Park to Drive, the engine rocking more than it should, or visible cracks in the rubber. Some mounts are fluid-filled, any oily weep from a mount is a red flag. If the car has had an oil leak for a while, that can accelerate rubber deterioration too.

As part of regular servicing, it’s smart to give the mounts a quick look every 10–15,000 km. Check for perished rubber, torn bonding, collapsed height, or leaking hydraulic fluid. A gentle pry with a bar can show excessive movement, and any mount that has sagged enough to change belt or shaft angles should be replaced.

Replacement is straightforward for a competent home mechanic but does require safely supporting the engine with a jack and a timber block under the sump or an engine support bar. Always loosen and remove the mount-to-body and mount-to-engine bolts in the correct order, then torque them with the engine at normal ride height. On the bB, the right-hand (engine-side) mount is a common wear item, if one mount has failed at higher kilometres, it’s worth assessing the others while you’re in there. Use quality OEM or equivalent parts, and recheck fastener torque after a short shakedown drive.

• How long do engine mounts last on a 2004 Toyota bB?

Most bB mounts will comfortably see 120,000–200,000 km, but driving style, road conditions, and exposure to oil leaks make a big difference. City stop–start and lots of load/unload cycles can shorten life. If vibrations increase or you notice clunks on take-off, it’s time for an inspection regardless of kilometres.

• Can the engine mounts on a bB be changed at home?

Yes, with proper safety gear, axle stands, and a way to support the engine. The job involves removing mount brackets and torquing fasteners with the engine settled at normal height. Corroded or tight bolts can slow things down, so penetrating oil and patience help. Many workshops quote around 1.5–3.0 hours per mount depending on location.

• Do all mounts need replacing at once?

Not always. If only one mount is failed and the others are healthy, replacing just the culprit is fine. That said, on higher-kilometre cars it’s common to find the remaining mounts tired, so doing them in pairs or as a set can restore smoothness and save repeat labour.