1.8T Audi A4 Timing Belt Replacement Info

Audi A4 Engine Bay 1.8TEverything you need to know about the 1997-2005 Audi A4 timing belt replacement on a 1.8T engine.

The Audi A4 1.8T 20 valve engine is driven by a timing belt system that links the cylinder head, camshafts, and crankshaft to run in sync. This Audi A4 timing belt system consists of a wear-resistant, high strength, corded/molded rubber timing belt (a.k.a. Audi A4 toothed belt). There's also an assortment of tensioners and idler rollers to guide and tension the A4 1.8T timing belt.

It's very important to service your 1.8T 20 valve timing belt. The timing belt, tensioner, and idler components eventually reach the end of their recommended service life. The 1.8T A4 is an interference engine (a.k.a. non-clearance engine). If the A4 1.8T timing belt fails, the timing belt system that links the cylinder head, camshafts, and crankshaft no longer runs in sync. Close tolerance engine designs allow for the cylinder head valves to hit the top side of the pistons. Audi A4 timing belt failure on these engines will result in catastrophic engine damage (i.e. bent valves and in some cases cracked pistons).

B5 Audi A4 Platform

The B5 platform A4 1.8T has three different timing belt system possibilities. The various systems depend on model year, engine code, and/or VIN. The differences include water pump location, tensioner design, and timing belt size.

  • 1997-1999 model years had only one timing belt system option. Owners will NOT need to confirm their engine code or VIN #.
  • 2000 model years have three different timing belt system possibilities. Owners will need to confirm their engine code to determine the correct timing belt system. These model years could have an AEB, ATW, or AWM engine code.
  • 2001 model years have the AWM engine code. The AWM engine code has two different timing belt system possibilities. Owners will need to confirm if they have the early or later system with their VIN #.

B6 Audi A4 Platform

  • 2002-2005 [2003-2006 Cabriolet] model years had only one timing belt system option. Owners will NOT need to confirm their engine code or VIN #.

Audi A4 Timing Belt Service Change Interval

Audi A4 timing belt Change IntervalWhat is the recommended Audi timing belt change interval on the 1.8T 20 valve engine?

The most recent recommend interval is 75,000 miles.

Some older scheduled Maintenance Service booklets reference a 105,000-mile timing belt service schedule interval. However, according to the most current manufacturer service schedule information, the interval has been updated to 75,000 miles.

What does Blauparts recommend? When dealing with crucial timing belt service, err on the side of caution and change your Audi A4 timing belt every 75,000 miles. It is our recommendation to closely inspect all timing belt components before the recommended interval. Play it safe, changing your timing belt may seem expensive. However, choosing to exceed your timing belt service interval is risky and can lead to unknown repair costs that will far exceed typical timing belt replacement service costs.

Intended Life-Expectancy of Timing Belt Components

Various Audi A4 timing belt component life spans. In our service facility, we've seen a few original timing belts last over 100,000 miles and others ready to break before 75,000 miles. In addition to mileage, other factors age the timing belt and related components. The following are some reasons why you see the difference in how long an Audi A4 timing belt and related components last: (1) un-logged engine idle times and sitting in traffic; (2) warm-up time in cold weather; (3) environmental climate factors; (4) related engine maintenance that may have been overlooked.

Audi A4 Timing Belt Parts Life Interval 1.8TKeys to the long life of your new timing belt components after timing belt replacement. Make your new parts last! You can expect your new BLAU INA OEM components to last the specified 75,000-mile interval if the following important steps were taken: Audi A4 Timing Belt Part Life Expectancy

1) Timing belt service was performed using BLAU INA OEM components. The same timing belt and timing belt tensioner that was fitted on your Audi A4 from the factory, is engineered to meet factory interval requirements.

2) Timing belt service was performed by an experienced competent ASE-certified Audi mechanic who is familiar with your specific engine 1.8T engine.

3) Factory service procedures must be strictly followed. Even if installing the best parts, using improper procedures can shorten their life span. Incorrect installation or missteps during timing belt service are often done without intent and aren't noticed until further down the road. Fortunately, some common mishaps are noticed after re-assembly and during the final engine rotational timing sequences.

Audi A4 Timing Belt Replacement Cost for 1.8T Models

How much does it cost to replace the Audi A4 timing belt on the 2.0 Turbo FSI? How long does it take to change the timing belt on an Audi A4 2.0 Turbo FSI? How much will the parts cost? How much will the labor cost? Thinking of buying an Audi A4 1.8T and wondering about timing belt replacement?

How long does Audi A4 timing belt replacement take?

How Long Does It Take?

How long does it take to replace the Audi A4 timing belt on the 1.8 Turbo 20 Valve? The average timing belt service labor time for this engine is around 6-8 hours depending on the technician's experience and the amount of timing belt parts being replaced.

How Much Does It Cost?

1.8T Audi A4 Timing Belt Labor Cost pictureThe average shop labor rate is $75 - $200 per hour. The lesser amount is often found in smaller cities and the more expensive labor rate seems to align itself with larger cities. Depending on shop rate, technician's experience, and the amount of timing belt parts being replaced it can cost approximately $600-$1,600. This is just the labor cost (not including parts).

How Much Do The Parts Cost?

It depends. Some choose to source the parts themselves, while others get the parts through their repair shop. Some repair shops prefer to supply the parts themselves. This allows for cost margins and potential profits on the parts. Also, they can control the type of parts used, reducing the potential problem of having customers come back with part issues.

You won't have to worry about this with our INA Gen II BLAU Audi A4 Timing Belt Kits ranging from $150.00 to $290.00 and include the same quality parts that came on your car, just without the genuine logo. This is a huge saving vs retail dealer cost. Have your mechanic call us!

Looking to Buy A Used Audi A4 and Wondering About Timing Belt Replacement?

Many people who are looking to buy a used Audi A4 1.8T valve start researching the cost of replacing the timing belt. It's best to purchase a car that comes with service history records from the previous owner. Owners who value their car and took care of it will have a record of all service history, an indication of the vehicle's overall shape and reliability. The importance of service records is indisputable. A seller without any service records, is looking to take advantage of the "inexperienced" buyer, making more money at their expense.

Audi A4 Timing Belt Replacement Service RecordsInspecting a timing belt that "seems fine" isn't enough. You'll also want to confirm when the last timing belt service was performed with the appropriate documentation. Don't just take the word of a seller saying "Oh, I think I changed it around 30,000 miles ago." Assumptions and no documents mean RISK. Calculate the cost of timing belt replacement into your purchase price if they don't have the records.

Example of Negotiation:
2004 Audi A4 1.8T 20 Valve - 102,000 Miles - Asking Price: $7,900
Buyer: "When was the timing belt done last."
Seller: "Oh, I just did it. I think it was about 30,000 miles ago."
Buyer: "Do you have the paperwork?"
Seller: "No, I don't."
Buyer:"Well with no documentation, I'll have to get it replaced to establish a guarantee baseline. That will cost me around $700-$1,800. Are you willing to take $700-$1,800 off the purchase price?"

What to Replace While Changing the Audi A4 Timing Belt on the 1.8T 20 Valve Engine

Audi A4 Timing Belt Replacement Diagram 1.8TB5 Platform
1997-2000 AEB and ATW Engine Codes
The timing belt system on the AEB, ATW, and ATB Audi A4 1.8T 20 valve engines is comprised of the timing belt and three other serviceable timing belt components. One is the main timing belt tensioner. Second is the timing belt hydraulic tensioner damper which provides variable hydraulic loaded tension to the main tensioner for timing belt tension. The third is a small idler bearing that is mounted to the hydraulic tensioner damper. These components work in sync with each other to guide and tension the timing belt.

2000-2001 AWM Engine Code - Early VIN
The timing belt system on the AWM Audi A4 1.8T 20 valve engine is comprised of the timing belt and four other serviceable timing belt components. One is the main timing belt tensioner. Second is the timing belt hydraulic tensioner damper which provides variable hydraulic loaded tension to the main tensioner for timing belt tension. The third is a small idler bearing that is mounted to the hydraulic tensioner damper. Fourth is the water pump, which is driven by the timing belt.

2001-2001 AWM Engine Code - Late VIN
The original timing belt system on the AWM Audi A4 1.8T 20 valve engine is comprised of the timing belt and four other serviceable timing belt components. One is the main timing belt tensioner. Second is the timing belt hydraulic tensioner damper which provides variable hydraulic loaded tension to the main tensioner for timing belt tension. The third is a small idler bearing that is mounted to the hydraulic tensioner damper. Fourth is the water pump, which is driven by the timing belt.

B6 Platform
2002-2005 The original timing belt system on the B6 Audi A4 1.8T 20 valve engine is comprised of the timing belt and four other serviceable timing belt components. One is the main timing belt tensioner. Second is the timing belt hydraulic tensioner damper which provides variable hydraulic loaded tension to the main tensioner for timing belt tension. The third is a small idler bearing that is mounted to the hydraulic tensioner damper. Fourth is the water pump, which is driven by the timing belt.

Before going through the significant work of taking your car apart for timing belt replacement, please consider the following:

Looking To Save Money... "Can I Just Replace the Timing Belt?" Simply changing the Audi A4 timing belt isn't enough. Why? Around the timing belt service interval (90,000 - 110,000 miles), due to age, the integrity of the tensioner(s), damper, water pump, and other seals and o-rings are at the end or very near the end of their service life. Some individuals make the mistake of only replacing the timing belt. Then, 10,000-20,000 miles later, their new timing belt fails due to tensioner, idler bearing, or water pump failure.

Tensioners

Why replace your Audi A4 timing belt tensioners during timing belt service? Just as the timing belt has a designated service life and subsequent change interval, so do the tensioners and idler bearings. Timing belts can indeed get old, begin to crack, and eventually fail. However, it is just as common for the timing belt tensioners and/or idler bearings to fail, thus causing timing belt failure.

How can the tensioners cause a timing belt to fail? Most tensioner bearings contain a set amount of grease behind the seal. This grease provides ample lubrication and ensures tensioner reliability for the designated life span (90,000 - 110,000 miles). During engine operation, constant thermal temperature fluctuations eventually cause the bearing's grease to break down and lose its lubricating properties. Over time, this results in unwanted bearing play and the eventual seizure. If a timing belt tensioner has too much play or seizes, the timing belt can become misaligned, or begin to 'burn up' and shred, causing engine failure. Thermal temperatures also affect the timing belt causing the material composition of the belt to change and accelerate its life span, often resulting in premature failure.

Water Pump

Why replace your Audi A4 water pump during timing belt service?

AEB and ATW Engine Codes These engines feature an external water pump that is driven by a small v belt driven off of the crank pulley. It is located just to the driver's side of the timing belt area. With the vehicle in the timing belt service position, many of the beginning timing belt service steps are required for water pump replacement such as removing the accessory belts and timing belt cover removal. The water pump contains an internal sealed bearing that has a life span similar to the timing belt, tensioner, and idler bearings. The internal bearing and seals of an Audi water pump can weaken and is the primary reason why a water pump eventually fails.

AWM Engine Codes It makes sense from a labor standpoint since timing belt dis-assembly is required for the water pump replacement. The water pump is driven by the timing belt and contains an internal sealed bearing that has a life span similar to the timing belt, tensioner, and idler bearings. The internal bearing and seals of an Audi water pump can weaken and is the primary reason why a water pump eventually fails.

Thermostat

Why replace your Audi A4 thermostat during timing belt service? The engine temperature is controlled by the thermostat. Near the end of its designated service life the thermostat spring temper changes. This causes the thermostat to open too much allowing the engine to run cooler, resulting in poor fuel optimization, decreased fuel economy, and less horsepower.

Audi A4 Valve Cover Gasket Replacement 1.8TValve Cover Gaskets & Cam Chain Tensioner Gaskets

Why replace your Audi A4 valve cover gaskets and cam chain tensioner gaskets during timing belt service?

Oil leaks are very common on Audi A4 1.8T 20 valve models and are often noticed around 75,000-90,000 miles. Leaking valve cover or cam chain tensioner gasket is the most common, producing a foul burning oil smell in your interior. It makes sense from a labor standpoint to replace them during timing belt service and will save you precious time and hundreds of $$$ of costly labor charges.

Special Tools for Audi A4 Timing Belt Replacement 1.8T Models

Please Note: Our timing belt tool rental kits are no longer available for rental. All tool rental kits are available for sale in good used condition in our online catalog.

Do I need special tools? Can I do it without the tools?

When replacing the Audi A4 timing belt on my 1.8T model, do I need the special tools? On older single-cam Audi engines it is possible to achieve general timing without the special tools. However, on modern interference Audi engines this is very risky. Special tools were designed for a reason. They maintain a proper timing relationship between the camshafts and the crankshaft position. Slight variations in timing or orientation can result in catastrophic engine damage (e.g. bent valves).

This isn't the area of vehicle maintenance to cut corners or try to save time. On these Audi models, to achieve 100% proper cam to crankshaft timing, special tools are necessary. When the timing is off just a degree or two the check engine light could appear, and a lack of performance is often noticed. Remember, you're performing a crucial maintenance repair. If done incorrectly, catastrophic engine damage will result.

The Audi 1.8T engine has no specific tools to hold the crankshaft and camshaft in an exact place well changing your timing belt. The engine timing marks are referenced by the timing alignment marks placed by the factory. Some special tools can make your timing belt service much easier. This would include special tools for counter holding the crankshaft sprocket well loosening and tightening the crankshaft bolt as well as the camshaft sprocket bolt. Other beneficial tools include the cam and crank seal removers, cam and cranks seal installers, radiator valance support tools, an eccentric wrench for properly tensioning the timing belt tensioner, and a 2-jaw puller for popping the tapered camshaft sprocket loose.

Special Audi A4 Timing Belt Tools 1.8TBasic Descriptions of Essential Audi A4 Timing Belt Tools:

3415 - Crankshaft pulley retainer bar.
3036 - Camshaft sprocket holder.
T10020 - Eccentric pulley pin wrench.

NOTE: The following tools are used depending on the depth of the Audi A4 timing belt service that you're performing and if you've chosen to change the cam or crank seals.

T40001 - Camshaft sprocket puller.
T40098 - Serpentine belt tensioner locking pin.
2085 - Camshaft seal remover tool.
3241/1 - Camshaft seal installer tool.
3203 - Crankshaft seal remover.
3202 - Crankshaft seal installer tool.