Timing Belt questions-Why at 50K and what pieces?

[chefrobert]

I've become well aware that I have to change my timing belt at 50 K. Both my leganzas are approaching that mileage.

I am still perplexed that I have to change the belt/tensioner and roller guides.



What is the final verdict on why such failure rates are experienced with these pieces. Is it just a poor engine design that puts too much stress on all 3 components? Really doesn't make sense to me. I would be happier if the replacement components were not so expensive. I guess I am hoping that an official engineering study came out and identified the single weak component instead of the cluster of fixing all 3!!! HELP!

[Man with no name]

Do it before 50 k. Better safe than sorry! I own a leganza as well and the fact that a broken timing belt means DEATH (for the car..at least..) scares me....

[daewoomofo]

if the belt, tensioner and roller arent changed the belt will slip or break, causing some if not all valves to contact the pistons, causing bent valves and having to replace the head. its also a good idea to change the water pump while your at it

[john_trickle]

Timing Belt Replacement Recommendations for Daewoo

DAEWOO
Lanos
1999-02 1.6L 4-Cyl. (DOHC) *# T310 60,000 Federal
102,000 Federal
Leganza
1999-02 2.2L 4-Cyl. (DOHC) *# T305 72,000 Federal
102,000 Federal
Nubira
1999-02 2.0L 4-Cyl. (DOHC) *# T309 72,000 Federal
102,000 Federal

JOHN_TRICKLE
Daewoo Lanos 1.5L SOHC, TD04L @ 7psi

[john_trickle]

Timing Belt Replacement Recommendations for Daewoo

DAEWOO
Lanos
1999-02 1.6L 4-Cyl. (DOHC) *# T310 60,000 Federal
102,000 Federal
Leganza
1999-02 2.2L 4-Cyl. (DOHC) *# T305 72,000 Federal
102,000 Federal
Nubira
1999-02 2.0L 4-Cyl. (DOHC) *# T309 72,000 Federal
102,000 Federal

JOHN_TRICKLE
Daewoo Lanos 1.5L SOHC, TD04L @ 7psi

WHY IDLERS AND TENSIONERS ALSO REQUIRE REPLACEMENT WHEN CHANGING A TIMING BELT

Timing belts have a limited service life. That’s why belts should always be replaced at the vehicle manufacturer’s recommended mileage interval. But a belt change alone may not be enough because the majority of belt failures are actually caused by faulty belt tensioners and idlers. These failures can result in major engine damage and expensive repairs. Consequently, the new timing belt you’ve just installed may fail after a few thousand miles if the tensioner or idler is worn or loose.

The eccentric idlers and/or pulleys that are used on many OHC engines to maintain belt tension also have a limited service life — which in some cases may be less than that of the belt! Their lifespan depends on their location, operating temperature, load, engine rpm and other environmental factors. Most tensioner and idlers have a design life of around 2,000 hours, which may be the equivalent of 40,000 to 60,000 or more miles of service depending on how the vehicle is driven. Unless these components are also replaced when the belt is changed, it could lead to premature failure of the new belt.

Tensioner bearings are "sealed for life" and are not serviceable. So there’s no way to clean, inspect or relubricate the bearings when a timing belt is changed. Over time, the grease inside breaks down and oxidizes, accelerating bearing wear and increasing the risk of a bearing failure or seizure. And the hotter the operating environment, the shorter the lifespan of the grease and the bearings. The location of these components under the timing belt cover prevents them from receiving much cooling, so they tend to run quite hot.

If a tensioner bearing seal fails, dirt and humidity can enter the bearing. At the same time, a leaky seal will allow the grease inside to escape, dooming the bearing to rapid failure.

On many newer engines, spring-loaded automatic tensioners are used to keep the timing belt tight. A slide plate allows the tensioner roller to move against the belt. As the miles accumulate, though, wear can cause the plate to stick against the engine block, preventing the tensioner from maintaining proper pressure. High underhood temperatures can also cause a loss of spring tension over time.

If the belt loses tension, it may jump time or slip. And if an idler pulley or tensioner seizes, it may cause the belt to suddenly snap.

Unfortunately, you can’t always determine the true condition of these components by a simple visual inspection. Any pulley bearing that has visible looseness, grease streaks radiating outward from a damaged seal, makes noise or does not turn freely, obviously needs to be replaced. But many tensioner pulleys that appear to be okay may be at or near the end of their useful service life. Reusing them is a risky proposition. That’s why the tensioner and idlers should always be replaced when installing a new belt.

Timing component kits are now available in the aftermarket, that make it much easier to replace the tensioner idlers and pulleys along with the belt. The kits include a new timing belt, idler and/or tensioner assembly along with detailed installation instructions. Do the job right the first time and significantly reduce the risk of component failure.


JOHN_TRICKLE
Daewoo Lanos 1.5L SOHC, TD04L @ 7psi[/quote]

[Daniel]

Timing Belt Replacement Recommendations for Daewoo

DAEWOO
Lanos
1999-02 1.6L 4-Cyl. (DOHC) *# T310 60,000 Federal
102,000 Federal
Leganza
1999-02 2.2L 4-Cyl. (DOHC) *# T305 72,000 Federal
102,000 Federal
Nubira
1999-02 2.0L 4-Cyl. (DOHC) *# T309 72,000 Federal
102,000 Federal

JOHN_TRICKLE
Daewoo Lanos 1.5L SOHC, TD04L @ 7psi

I'm puzzled here!
What do you mean by: "T310 60,000 Federal
102,000 Federal" ?
And is it in km or miles?

Daniel

[john_trickle]

Timing Belt Replacement Recommendations for Daewoo

DAEWOO
Lanos
1999-02 1.6L 4-Cyl. (DOHC) *# T310 60,000 Federal
102,000 Federal
Leganza
1999-02 2.2L 4-Cyl. (DOHC) *# T305 72,000 Federal
102,000 Federal
Nubira
1999-02 2.0L 4-Cyl. (DOHC) *# T309 72,000 Federal
102,000 Federal

JOHN_TRICKLE
Daewoo Lanos 1.5L SOHC, TD04L @ 7psi

I'm puzzled here!
What do you mean by: "T310 60,000 Federal
102,000 Federal" ?
And is it in km or miles?

Daniel

sorry about that its in miles

[AcingTeam]

All daewoo belts tend to break between 50k-60k miles. No matter what it states on the paper. I've only replace it once at 53k miles (just the belt), now I'm up to 87k miles and everything's fine. *knocks on wood 3 times*