Tag: owner

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What Are the Potential Dangers and Costs of Not Replacing Your Timing Belt Regularly?

Expensive damage can be caused to your engine: Many timing belt engines are “interference motors”, which simply means that the valves would hit the pistons if not kept in proper timing. This is not a problem under normal operating conditions but if the timing belt were to break or jump off the gears, the valves of one or more cylinders would strike the pistons and cause severe and costly damage.

If your car has more than the recommended mileage on the timing belt, you may be operating your car on borrowed time and the cost of replacing the belt is MUCH cheaper than having to rebuild or replace the engine because of damage caused by a snapped/worn timing belt.

Parts can be hard to find to repair damage caused by a failed timing belt: It’s obvious that timing belt replacement as a preventive maintenance measure is often ignored. This is so prevalent, in fact, that many car manufacturers and engine parts manufacturers don’t stock major engine components for timing-belt engines after the required 5-7 years because there will be only a handful of these cars still on the road. It can be quite difficult to find crankshafts, pistons, connecting rods, camshafts and the like for these older engines due to the economic infeasibility for the manufacturers to continue producing these parts for the few cars that they estimate will still be on the road.

In fact, many car manufacturers don’t expect timing-belt driven engines to last through more than two timing belts or approximately 120,000-150,000 miles and, moreover, they actually expect many to be taken out of service with the original belt still installed. Sadly, there are hundreds of thousands of 85,000-90,000 mile timing belt cars in junkyards because the timing belt was never replaced. What a waste when these cars could still be enjoying a useful life had the owner just paid attention to the recommended mileage replacement intervals for the timing belt.

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When To Replace Your Timing Belt

Timing belt replacement is the “must-do” service operation which every car owner should know about. Along with that knowledge, we should be aware of whether our engine is considered an interference engine or not. These two bits of information can, at a minimum, save us from unexpected breakdown and in the extreme can help us avoid thousands of dollars in repairs.
Without getting too technical, the synchronization between two internal engine parts (the crank and cam shafts) is accomplished with the help of the timing belt. In the process of these two parts moving the valves open and close in close proximity to the pistons. This constitutes an interference engine, because if the timing belt jumps a tooth on the sprocket on which it rides or the belt fails altogether the valves and pistons will “interfere” with each other.

This collision will cause major damage to the engine. The repair bill will, on older vehicles, often exceed the value of the car. On the other hand, a car whose engine is not configured this way will simply lose power or will not start. While this might be more desirable than facing huge repair costs, it is something that is better avoided if possible.

The motivation for preemptive replacement of the timing belt is obvious. But how do you know when to replace it? There is always the owner’s manual which will indicate mileage of anywhere from 50,000 to 90,000 miles. For a comprehensive list of timing belt service intervals and the type of engine (interference or not) check out About.com.

Some other considerations relative to timing belt replacement are:

1) Is the vehicle leaking any type of fluid that might degrade the belt, if so disregard the suggested replacement interval and replace the belt ASAP as well as repair the leak;

2) Do you know the repair history of the vehicle if it is not verifiable err on the side of safety and replace the belt;

3) Timing belt replacement can be labor intensive. Since the water pump is usually accessed in the same operation you might consider replacing the pump at the same time even if it doesn’t leak. You will save on labor and possibly prevent a pump replacement later on that will also necessitate the belt to be replaced again;

4) To avoid subsequent failure consider replacing sprockets and tensioners that are part of the timing belt system. All components are sometimes sold as a kit and can be less expensive than purchasing them individually.

All service intervals should be followed in order to protect your investment and maintain the integrity of your warranty. In the case of the timing belt, it just makes sense.