CriticalCommonEngine

Mitsubishi Triton: 4D56 2.5D Timing Belt Failure (Interference Engine)

4D56 2.5D Timing Belt Failure (Interference Engine) is a common engine fault on the Mitsubishi Triton on the 2005–2015 cars, and we rate it critical. Putting it right costs $450 to $900 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 34 documented faults on the Mitsubishi Triton.

Vehicle: Mitsubishi Triton
Engine: 4D56
Years: 2005–2015
Fuel: diesel
System: Engine

This page covers the Mitsubishi Triton as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Mitsubishi Triton faults34 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph of the Timing belt yet. We would rather show none than show a picture of a different part.

What goes wrong

The 4D56 2.5-litre diesel is an interference engine fitted with a rubber timing belt requiring replacement at 100,000 km intervals. Belt failure causes catastrophic piston-to-valve contact and complete engine destruction. Widely documented in NZ and AU as the single highest-risk failure on ML/MN Tritons due to many owners missing or deferring the service. Second-hand imports often arrive with unknown belt history.

What you would notice

No warning — engine stops suddenly without prior symptoms
Catastrophic engine failure if belt snaps at speed
Rough running or misfires if belt has jumped a tooth

How to check it

Where to look. Front of engine, beneath timing cover on passenger side

Confirm timing belt replacement history with receipts.
Check sticker under bonnet for last service date/km.
If history is unknown, budget for immediate replacement.
Inspect belt tensioner and water pump condition — these should be replaced at the same interval.

Parts involved: Timing belt.

What it costs to put right

$450 to $900 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.

Ask the seller

“Can you show me the service history confirming timing belt replacement?”
“Has the tensioner and water pump been replaced at the same time?”
“What is the current odometer reading versus the last belt change?”

Now check the Mitsubishi Triton you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

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.

Mitsubishi Triton buyer questions

Is 4d56 2.5d timing belt failure (interference engine) serious on a Mitsubishi Triton?

We rate it critical and common on the Mitsubishi Triton. The 4D56 2.5-litre diesel is an interference engine fitted with a rubber timing belt requiring replacement at 100,000 km intervals. Belt failure causes catastrophic piston-to-valve contact and complete engine destruction. Widely documented in NZ and AU as the single highest-risk failure on ML/MN Tritons due to many owners missing or deferring the service. Second-hand imports often arrive with unknown belt history.

How much does it cost to fix on a Mitsubishi Triton?

$450 to $900 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which Mitsubishi Triton years are affected?

Our research records this fault on the 2005–2015 Mitsubishi Triton. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.

How do I check for it before I buy?

Confirm timing belt replacement history with receipts. Check sticker under bonnet for last service date/km. If history is unknown, budget for immediate replacement. Inspect belt tensioner and water pump condition — these should be replaced at the same interval. Look here: Front of engine, beneath timing cover on passenger side