Toyota HiAce: Injector copper seat seal failure letting combustion gas into the oil (3.0 1KD-FTV diesel, 2005-2007)

Early 3.0 1KD-FTV diesel HiAce vans built from 2005 to August 2007 used copper injector seats, and failure of these seats is a known issue on these engines. When a seat leaks, combustion gas blows past the injector into the engine oil, which can contaminate the oil and block the sump pick-up, starving the bearings. Toyota changed to aluminium seats from August 2007, and specialists recommend replacing the copper seats and cleaning the sump pick-up on earlier engines.

• Oil level rising above maximum on dipstick without adding oil
• Diesel smell from engine oil
• Misfiring cylinder or rough idle
• Excessive black smoke under load
• Oil pressure warning light if dilution is severe

1. 1

   Check oil on the dipstick — smell and feel it for diesel contamination.

2. 2

   Look for any historical rising oil levels between services in the service book.

3. 3

   Confirm whether the vehicle has been recalled and repaired.

4. 4

   Check for a NZTA recall compliance record.

Parts involved: Fuel injector.

$2,000 to $5,500 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

• “Have the fuel injectors been inspected or replaced under Toyota recall?”
• “Has the vehicle been in commercial courier or high-idle use?”
• “What does the oil smell and look like on the dipstick right now?”

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.