At what mileage does the timing belt change on a Prado 150?

Time functions and design

To understand what these terms mean, you need to know how an internal combustion engine works.

The operation of any four-stroke internal combustion engine is based on cyclic phases: injection (introduction) of the air-fuel mixture, compression, ignition, combustion (expansion) and subsequent removal of exhaust gases. The gas distribution mechanism is responsible for the consistency of these processes.

The timing belt consists of a crankshaft (sometimes not just one, but several), an intake/exhaust valve and a belt (or chain). The entire system allows certain cylinders to be filled with a fuel-air mixture at a given point in the cycle, and then the exhaust gases are immediately removed into the exhaust manifold.

The valves open and close under the influence of the camshafts. They are located relative to each other in such a way as to ensure the motor phases determined by the designers.

The rotation of the camshaft is transmitted from the crankshaft through a chain or belt. An important condition for proper engine operation is compliance with the specified relative position (rotation angle) of the gas distribution mechanism relative to the CNG (cylinder-piston group). These are the so-called phases. The pulleys of the above shafts are marked, which must correspond to the specified position.

What is the timing belt used for and how does it work?

From the above it follows that with the help of a toothed belt, the rotation of the crankshaft and camshaft is synchronized. Some engine models still have the function of driving auxiliary mechanisms such as a pump.

To make replacement easier, many modern internal combustion engine designers have a mechanism for gas distribution at the front or side of the engine. In the Prado diesel engine it is located between the cooling radiator and the cylinder block. Open access models are usually found on the Russian market, and to replace the Prado150 timing belt in European versions, you will need to remove the protective cover. In any case, Prado, this operation is not difficult.

Externally, the timing belt is a closed flexible rim of a certain length with an N number of teeth inside. For each motor, even of the same brand, its technical characteristics are individual. They were originally made of rubber, inside which the cord threads were made of textile material, and now they are made of special fiberglass based on special polymers that are highly durable and resistant to temperature changes.

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The service life of the timing belt, declared by modern manufacturers before replacement, is at least 150 thousand km. This is confirmed by employees and service stations. The product easily takes care of such a resource, although its service life is 2 times less. However, in practice, drivers often find themselves forgetting about the replacement interval or premature belt failure due to poor quality or other negative factors.

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Causes and consequences of Prado timing belt rupture

That being said, timing belt rupture on a Prado does happen, and often. The main factors that cause this emergency are:

• The replacement interval recommended by the manufacturer has been significantly exceeded.
• No non-compliance with operating rules was detected.
• Premature destruction of the belt (due to dirt, foreign objects under the teeth or technical fluids and/or oil on the surface of the product).
• Initially the products are of low quality.

According to experienced car service workers, the most common is the destruction of the Prado gas distribution mechanism due to its natural aging. Often, Russian motorists drive up to 50 thousand km during the recommended replacement period. Until the belt simply bursts due to old age. In this case, it needs to be replaced and the fault lies solely with the driver of the Prado due to negligence.

The second most common cause of drive failure in a Prado is a problem with the pulleys and/or tensioners, as well as a seized water pump on very old engines, which, as mentioned earlier, can also be torqued. It is recommended to check the condition of these mechanisms and the degree of tension of the belt itself, and if necessary, replace it during scheduled maintenance.

If a technical inspection of the Prado belt reveals the presence of aggressive technical fluid or automobile oil, it should be replaced as soon as possible.

Finally, by installing products from little-known manufacturers in your car, you increase the risk that the belt will not be declared at 60,000 km. And due to the dire consequences of interruption for Prado diesel engines, we do not recommend saving on this relatively inexpensive consumable, in case of replacement, by purchasing quality products.

The picture of Prado clutch belt is as follows. The camshaft rotates, the valves stop, and this may be their open position. Since there are no valve recesses on the surface of the Prado150 3.0 diesel engine pistons, they may encounter open valves. As a result, in the best case, you get a Prado engine that has just stopped; in the worst case, you get bent valves, their guides and even deformation of the piston mirror. All this will require expensive repairs and replacement.

What's more, the chain can damage the camshaft lobes and, in particularly unfortunate cases, damage the Prado's cylinder head or crank mechanism. Therefore, measure the cost of a quality belt with its replacement and the cost of likely repairs if it breaks.

Replacing the roller

If the bypass belt can be easily checked with characteristic sounds, then in the case of bearings everything is different. They start to wobble. Therefore, before a long journey it is better to replace them. The new rollers have a technological gap, and an assessment will have to be made by comparing the old and new ones.

Rollers are divided into two types:

1. With a thrust rib - in this case the bearing must fit tightly.
2. Pass-through cylindrical - without limiter.

Complete replacement of rollers is a difficult and lengthy process, because you will have to remove many attachments from the machine’s engine. Very often, tension mechanisms can last quite a long time, while the roller bearing quickly becomes unusable. Based on this, expensive repairs will be needed, which not everyone can afford. Therefore, you need to change the bearing itself and not touch the roller with the tension mechanism. This will significantly reduce the cost of repairs and restoration of its operation.

As you can see, it is not that difficult to remove and install the bypass belt and alternator. Share your results in the comments.

Video: How to Change the Timing Belt on a Prado 150

The Toyota Land Cruiser “Prado 150” engine (diesel / gasoline) is equipped with a toothed belt mechanism with balancing shafts. The camshaft rotates using a belt driven by the crankshaft pulley. The advantage of this Prado circuit is less noise of the synchronization mechanism, simplicity and low cost of replacement.

The maintenance manual states that for a Toyota Prado 150 diesel engine, the timing belt must be replaced within 120-150 thousand km. The instrument panel display also reminds you to perform this operation (the corresponding icon is displayed).

Reasons for replacing the timing belt on a Prado ahead of schedule:

• Visual deterioration of the surface (rubber has dried out, cracks and delamination have appeared).
• Traces of liquid or oil are visible on the belt.

Warning! Although a longer replacement interval is indicated in the service book, it is recommended to replace it on your Prado at 100,000 kilometers and install only original spare parts.

At the service station you will be asked to replace everything as a whole: timing belt, rollers, hydraulic tensioner and mounting bolt. Alternatively, you can purchase these parts and replace them yourself.

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Replacing the timing belt on a Prado is entirely up to the motorist to wield a screwdriver and wrenches. To remove the old part and install a new one, it will take no more than an hour and a half and does not require high skills.

• Drain the antifreeze . Remove the lower bumper trim, then protect the engine.
• Remove the fan diffuser . To access it, unscrew the three mounting bolts and release the power steering fluid reservoir. Disconnect the radiator bypass connections. Remove the coolant expansion tank (2 bolts). Unscrew the fan nuts. Next you need to remove the disk mount. Remove the diffuser bolts and radiator fan nuts. Delete them.
• Remove the fan shaft pulley.
• If there is a cover on the timing drive, it must be removed . Remove the clamps from the coolant pipe and wiring harness. Now loosely unscrew the cover (6 bolts).
• Before removing the belt on your Prado, you need to turn the entire mechanism (using the crankshaft pulley) clockwise and align the timing marks . Now you can remove the tensioner and the belt itself. Then turn the crankshaft 90° counterclockwise to ensure that the valves and pistons do not accidentally touch each other.
• Fill with coolant . Check all pipe connections for leaks.

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Timing drive installation (Prado):

• Tags must be merged before installing a new product . Next, using a press, you need to push the piston into the tensioner body to align the holes in them. When pressing the plunger, the tensioner should be positioned vertically. Insert a suitable lock (eg a pin with a diameter of at least 1 mm) into the aligned holes. Pull the belt pulley to install the tensioner. Tighten all mounting bolts. Remove the tensioner lock. Now the entire synchronization system works. Turn the crankshaft pulley 2-3 full turns and make sure the marks match.
• Install the protective cover; do the same with the cooling pipes and harnesses. .
• Install the fan pulley and diffuser.
• Replace oil cooler hoses (automatic versions).

The moment of replacing the Prado timing belt can be noted in the odometer memory of the on-board computer.

Warning! The indication that the Prado timing belt needs to be replaced does not reset automatically, it must be reset manually.

• Turn on the car's ignition.
• Scroll the display to Odometer Display (ODO) mode by pressing the control button on the trip computer.
• Press and hold this button for a long time.
• Turn off the ignition, hold at intervals of 5-10 seconds.
• Turn on the ignition while holding down the control button.
• The service mileage will be reset to zero, and in ODO mode the number 15 will appear, which corresponds to 150 thousand km until the next belt change.
• Short presses can change the desired interval.

After a few seconds, the set value will be recorded and the operation will be confirmed.

Maintenance regulations

Go through maintenance with us, for regular customers there are bonuses, discounts and nice gifts.

Toyota Prado maintenance regulations . Replace and/or check the car according to the regulations and you are guaranteed reliable operation of the car.

LAND CRUISER PRADO 120

Recommended periodic maintenance interval for your Toyota Land Cruiser Prado 120 -

every 10,000 km or once every 12 months, whichever comes first.

Fatal errors when replacing the timing belt

Many motorists prefer servicing their car to expensive services. Thus, they not only save money, but also enjoy the renovation process itself. Many of them may not only perform simple tasks such as oil changes, but also try to perform more serious work (for example, related to deadlines). Let's figure out how to avoid common mistakes.

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The biggest mistake inexperienced craftsmen make is incorrectly aligned marks on the crankshaft and camshaft pulley. Not many home auto mechanics know how to set them up. Often, due to dirt in the engine compartment, these marks are simply not visible. Bent valves can be the price of inattention. If an error occurs when aligning the marks, then even shifting the belt position by a couple of teeth will lead to engine malfunction or simply will not start.

Correct voltage

Incorrect belt tension is the second most common mistake. She often gets tired and later, feeling overly stressed, breaks down. Low voltage is no less dangerous. In this case, at high speed, he can jump or jump on the teeth. Basic check - try to turn the long free part of the belt around its axis by 90 ° with your fingers. The effort should not be excessive.

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A few particularly "frugal" motorists can only be replaced with worn-out time, and the rollers must remain old. Usually these savings come laterally. If visually the old roller is still normal, then when installing a new belt, the load on it increases and jamming may occur.

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SUVs Toyota Land Cruiser Prado 150 series are fourth generation vehicles. The weak point of the 3-liter turbocharged diesel engine is the timing belt. A breakdown in it leads to the destruction of the engine. Timely replacement of the timing belt on a 3-liter Prado 150 diesel can save you from costly engine repairs.

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Removing the generator of a Toyota Land Cruiser Prado

The sequence of steps is as follows:

1. We remove the wheel on the right and the battery.

2. We separate the positive terminal to avoid short circuiting.
3. We take out the 140A fuse.

4. We unfasten the plastic curtain that hides the engine section (there are 4 latches, one of them cannot be pulled out, because it will hold the parts).
5. We move aside the plastic cap that closes the passage.
6. Lubricate the nut with WD-40
7. Take the key and unscrew the bolts (key 14). Move the tension roller to the side at the bottom.
8. Remove the drive belt.
9. Remove the nut (key 10).
10. We separate the terminal and wire from the generator.

11. Remove 2 screws from the mounting.
12. Move the big bolt.

13. In the direction of the wheel, remove the lower mount.
14. Remove the top bolt using a long wrench.
15. We separate the socket from the generator.
16. While shaking, remove the generator. It is pulled out from the wheel side. If something gets in the way, just move it aside.

That's it, the removal process is over.

To install the generator, you need to do all the steps described above, only in reverse. After completing the assembly, remove the tools.

ADVICE! In order to avoid any problems with your car, do regular preventive inspections of your car.

Belt replacement instructions

The car service offers a service for replacing the drive part and roller. The cost of work is 3000-5000 rubles. The price for a repair kit for Prado LC is 6-7 thousand rubles. It includes pulley, hydraulic tensioner, bolt tensioner, timing belt. You can buy spare parts yourself.

Replacing the Prado 150 (diesel) timing belt with your own hands (removing and installing spare parts) takes little time. It will take 1-1.5 hours to change the topic:

1. Drain the coolant. Remove the trim (bottom) from the bumper and crankcase protection unit.
2. Unscrew the fan diffuser. To do this, remove the 3 bolts and remove the fluid reservoir. Disconnect the hoses from the radiator (bypass system). Remove the expansion tank (secured with two bolts). Unscrew the fan mounting nuts. Remove the drive unit for installation. Loosen the screws on the diffuser and fan nut. Remove the elements (diffuser, fan).
3. Remove the sleeves from the fan.
4. Remove the cover from the timing belt. Remove the shut-off devices from the cooling hose and wiring. Unscrew the cover (held in place by 6 bolts).
5. Remove the drive belt. Turn the crankshaft clockwise until the timing marks are aligned on the Prado 150. Remove the tensioner and belt. To prevent damage to the pistons and valves when the camshaft is rotated with the part removed, the crankshaft must be rotated 90 degrees counterclockwise.
6. Add coolant. Check for leaks.
7. Timing drive installation (Prado):

• When installing, align the marks. Using a press, push the piston (part of the tensioner structure) into the housing until their holes are aligned. Keep the tensioner vertical while pressing the piston. Insert the pin (diameter 1.27 mm) into the hole. Move the roller onto the belt and install the tensioner on the engine. Tighten the mounting bolts. Remove the tensioner clamp (rod). Use the crankshaft to make 2 full revolutions (360 by 360 degrees), checking the alignment of the marks.
• Install the belt cover. Tighten the mounting bolts (6 pcs.). Install the wiring holder. Secure the coolant hose.
• Install the fan pin and diffuser.
• Connect the oil cooler pipes (on models with automatic transmission).

On the dashboard you can set information about the mileage that will require replacing the Prado 150 (diesel) timing belt.

1. Turn on the ignition.
2. Use the ODO button on the display.
3. Press and hold the button.
4. Turn off the ignition for 5 seconds.
5. Turn on the ignition while holding the button pressed.
6. After the system update, release and press the ODO button (the number 15 will appear, which means 150,000 km).
7. Briefly press to set the desired numbers.

After a few seconds, the timing drive system will confirm operation.

The car owner must monitor the condition of the drive belt. It must be changed according to the rules. Element wear can damage the SUV (pistons and valves become deformed when they occur).

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