Engine 3RZ-FE (2.7 l. R4) VVT-I Toyota Land Cruiser Prado 120 / Lexus GX470 since 2002

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Specifications

The design features and technical characteristics of the 3RZ-FE engine are shown in the table:

Despite the impressive volume, the engine’s consumption is absolutely adequate. In moderate driving mode, this parameter is about 13 liters. Considering that the engine was installed on large cars, 13 liters is indeed a very good indicator. After all, it usually starts from 15 liters.

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Engine 3RZ-FE

The 3RZ-FE engine was developed in 1994 and turned out to be not only the most powerful, but also the most successful example of the RZ engine series.
In this engine, Toyota designers managed to optimally use the main advantages of the in-line four-cylinder I4 layout (low manufacturing cost, simplicity and reliability of operation) and at the same time minimize its disadvantages through the use of a complex balancer shaft design in the design. As a result, Toyota received a fairly powerful and inexpensive gasoline engine, which for 12 years was installed with great success on jeeps and numerous minivans of the company both within the country and in other automobile markets around the world (Europe, North America, Asia and the Middle East). At the time of its creation, the 3RZ-FE internal combustion engine was not only the largest in-line four in the wide range of Toyota engines, but also generally the leader among similar products from all other automakers in terms of volume/power. The fact is that the I4 configuration in a four-stroke engine is an unbalanced design that has an increased level of vibration, which increases in direct proportion to the increase in engine power. Therefore, this arrangement is usually used in small-volume power units not exceeding 2.5 liters. In the 3FZ motor, vibration was brought to an acceptable level by adding additional balancer (soothing) shafts to the mechanism design.

The 3RZ-FE is an engine of the standard power series (the letter “F” in the coding), has 4 valves per cylinder and a timing chain drive on one camshaft (High Efficiency Twincam Engine). The second camshaft is driven from the first through a gear. Such internal combustion engines are also called engines with a “narrow” cylinder head. Valve clearances are adjusted using adjustable washers. Early versions of the engine used a distributor ignition circuit; later the DIS-4 electronic system with individual ignition coils for each cylinder began to be used.

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Replacing timing chain 3RZ-FE, Toyota engine, Timing marks

Checking the drive belt for 3RZ-FE attachments

Adjusting the tension of the generator drive belt (if necessary),

a) Loosen the fastening bolts “A” and “B” indicated in the figure.

b) Use the adjusting bolt “C” to adjust the belt tension.

c) After completing the adjustment, tighten the fastening bolts “A” and “B”. Torque:

Adjusting the tension of the power steering pump drive belt (if necessary).

a) Loosen the lock nut of the intermediate pulley “A”,

b) Adjust the tension of the drive belt using the adjusting bolt “B”.

c) Tighten nut “A”.

Torque. 39 N m

Adjusting the tension of the air conditioning compressor drive belt (if necessary).

a) Loosen the idler pulley lock nut “A”.

b) Adjust the tension of the drive belt using the adjusting bolt “B”.

c) Tighten nut “A”.

Timing chain 3RZ-FE

1. Drain the engine oil.

2. Drain the coolant.

3. Remove the cylinder head assembly

4. Remove the crankshaft position sensor by unscrewing the 2 mounting bolts and removing the O-ring.

5. Remove the oil pan.

a) Unscrew the 16 bolts and 2 fastening nuts.

b) Insert the blade of the special device between the cylinder block and the oil pan and, cutting off the seal, remove the pan.

Do not damage the pan flange or the surface of the cylinder block.

6. Remove the oil receiver by unscrewing the bolt and 2 fastening nuts.

7. Remove the crankshaft pulley,

a) Remove the pulley bolt.

8. Remove the timing chain cover.

a) Unscrew the 2 nuts securing the coolant bypass pipe.

b) Unscrew the 2 bolts securing the timing chain cover.

c) Unscrew 9 bolts and 2 nuts.

d) Using a plastic hammer, carefully remove the timing chain cover with three shims.

9. Remove the timing chain and camshaft sprocket.

10. Remove the crankshaft drive sprocket.

11. Remove the chain tensioner guide bar No. 1 and damper No. 1 by unscrewing the bolts and fastening nut.

Balancer drive chain

12. Remove dampers No. 2 and No. 3, chain tensioner No. 2.

a) Using a pin, secure the tensioner rod No. 2.

b) Unscrew the fastening bolt and remove damper No. 2 (b).

c) Unscrew the two fastening bolts and remove damper No. 3 (c).

d) Unscrew the fastening nut and remove tensioner No. 2 (d).

13. Remove the balancer drive gear, shaft, balancer drive chain, and balancer drive sprocket.

a) Unscrew the bolt securing the balance shaft drive gear.

b) Remove the balance shaft drive gear along with the axle.

c) Remove the balancer drive chain with the balancer drive drive sprocket.

14. Remove damper No. 4 by unscrewing the 2 mounting bolts.

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Operation and maintenance

As for the maintenance of this motor, it is quite simple and hassle-free. Actually, like almost all Toyotas. Considering that this power unit has only 4 cylinders, a simple injection system and a fairly reliable timing system, you still need to try to create any problems. The 3RZ-FE has never been picky about oil or fuel. The low degree of forcing only contributed to high reliability. All changes (oil, filters) are carried out exclusively in accordance with the regulations (every 10 thousand km). Replacing spark plugs - every 30-40 thousand km. All other work is carried out extremely rarely. Naturally, it’s worth keeping an eye on belt tensioners, coolant levels, etc. Otherwise, the engine will not cause any problems.

All of the above will ensure the engine operates for many years to come, without any repairs. The simplicity of the 3RZ-FE motor design allows you to regulate everything yourself.

This is where the advantages of the four-cylinder layout are visible. Due to its small size, getting to the attachments will not be difficult. Having the simplest service instructions in hand will allow you to repair absolutely any breakdown in this motor. For example, a generator plays one of the most important roles in the operation of a motor. It is driven by a belt. This belt must be in good condition.

In order for the belt not to fail prematurely, it must have the correct tension. There is a special screw to adjust this parameter. It is located in an accessible place, you can adjust it with a simple movement. There is the same screw on the air conditioning compressor belt.

As for repairing the engine itself, this should be done in specialized conditions, although the engine is simple in design, but doing something wrong is as easy as shelling pears. Therefore, it is better to entrust timing adjustment and repair to specialists. Due to the fact that the motor is complicated by a balancing system, repairs should be made using special balancing equipment. Timing chains have special designations that help ensure correct adjustment of the chain and gears. It is impossible to provide quality service without proper knowledge. If you make a mistake when assembling the timing belt, this will lead to instant failure of the entire engine.

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