Audi A4: Timing belt, tensioner and water pump failure on interference engines (1.8T 20v and 2.4/2.8 V6 30v)
Timing belt, tensioner and water pump failure on interference engines (1.8T 20v and 2.4/2.8 V6 30v) is a common engine fault on the Audi A4 on the 1996–2001 cars, and we rate it critical. Putting it right costs $1,100 to $2,800 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 45 documented faults on the Audi A4.
- Vehicle
- Audi A4
- Engine
- 1.8L / 2.4L / 2.8L
- Years
- 1996–2001
- Fuel
- petrol
- System
- Engine
What you are looking at
No photograph available
What goes wrong
Both the B5 1.8T and the 30 valve V6 are interference engines with the water pump, a hydraulic tensioner and rollers on the same timing belt. The tensioner and roller bearings wear out, and the original 1.8T water pump has a plastic impeller that can crack and cause overheating. If the belt snaps or jumps, the valves hit the pistons and the head, sometimes the whole engine, has to be rebuilt. The belt kit including water pump, tensioner and rollers should be done around every 90,000 to 105,000 km or 5 to 7 years, whichever comes first, and many B5s in NZ are overdue.
What you would notice
- Ticking or whirring from the front of the engine
- Coolant weeping at the front of the engine behind the belt cover
- Overheating or temperature gauge climbing
- Car will not start or runs badly after the belt has jumped a tooth
How to check it
Where to look. Front of the engine behind the plastic timing covers; the front bumper and radiator support usually have to be moved forward (service position) to reach it
Look for a timing belt sticker on the slam panel or cam cover with a date and km, and ask for the invoice: it should list the belt, tensioner, rollers and water pump, not just the belt.
If there is no proof within the last 100,000 km or 7 years, price a full belt kit into your offer.
Start the engine cold and listen at the front of the engine for ticking, squealing or a rough whirr from the belt area.
Look with a phone torch under the front of the engine for pink or green coolant crust.
Watch that the temperature gauge sits in the middle during the test drive.
If a workshop inspection is possible: remove the upper timing cover to check the belt age and condition, the tensioner for oil leaks, and the water pump for play or weeping.
What it costs to put right
$1,100 to $2,800 at New Zealand independent workshop rates. That is for this job on its own, not for the car.
Ask the seller
- “When was the timing belt last done, at what km, and do you have the invoice?”
- “Were the water pump, tensioner and rollers replaced at the same time?”
- “Was a metal impeller water pump fitted?”
Now check the Audi A4 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.
Where this comes from
- Blauparts: Audi A4 Timing Belt Replacement Technical Info 1.8T
- Blauparts: Audi A4 A6 Timing Belt Replacement Info 2.8L 30V
- vwtuning.co: The 7 Most Common Audi A4 B5 Engine Problems (timing belt and tensioner failure, 1.8T and 2.8 V6)
- AudiWorld A4 B5 forum: b5 1.8t timing belt problem
- AudiWorld A4 B5 forum: HELP! Cams jumped out of timing
Audi A4 buyer questions
Is timing belt, tensioner and water pump failure on interference engines (1.8t 20v and 2.4/2.8 v6 30v) serious on a Audi A4?
We rate it critical and common on the Audi A4. Both the B5 1.8T and the 30 valve V6 are interference engines with the water pump, a hydraulic tensioner and rollers on the same timing belt. The tensioner and roller bearings wear out, and the original 1.8T water pump has a plastic impeller that can crack and cause overheating. If the belt snaps or jumps, the valves hit the pistons and the head, sometimes the whole engine, has to be rebuilt. The belt kit including water pump, tensioner and rollers should be done around every 90,000 to 105,000 km or 5 to 7 years, whichever comes first, and many B5s in NZ are overdue.
How much does it cost to fix on a Audi A4?
$1,100 to $2,800 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 Audi A4 years are affected?
Our research records this fault on the 1996–2001 Audi A4. 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?
Look for a timing belt sticker on the slam panel or cam cover with a date and km, and ask for the invoice: it should list the belt, tensioner, rollers and water pump, not just the belt. If there is no proof within the last 100,000 km or 7 years, price a full belt kit into your offer. Start the engine cold and listen at the front of the engine for ticking, squealing or a rough whirr from the belt area. Look with a phone torch under the front of the engine for pink or green coolant crust. Watch that the temperature gauge sits in the middle during the test drive. If a workshop inspection is possible: remove the upper timing cover to check the belt age and condition, the tensioner for oil leaks, and the water pump for play or weeping. Look here: Front of the engine behind the plastic timing covers; the front bumper and radiator support usually have to be moved forward (service position) to reach it