Some tips for car owners (Nissan Murano Z50)

This book is intended to provide assistance to car owners.

Before starting any type of repair work, you must familiarize yourself with the procedure for carrying it out, described in the relevant chapter.

All chapters of the manual contain information on adjustment, maintenance, technical service, removal and installation of equipment, as well as a description of repair work processes.

We consider it necessary to mention two basic rules of mechanics.

First rule: in all cases where reference is made to the left side of the vehicle or engine, the driver's side of the vehicle is meant. Accordingly, the right side is the passenger side.

Second rule: all screws and bolts are unscrewed by turning them counterclockwise and tightened clockwise.

When performing mechanical work, three mistakes are usually made.

First mistake: violation of the order of assembly, disassembly or adjustment. Failure to follow the proper procedure for disassembling or assembling any part, or improper execution of work, not only leads to loss of time, but also to breakdowns. All processes must be performed in the order specified in the instructions. Before disassembling a very complex assembly, you may need to draw a picture of the assembly to make sure you have put all the component parts back in their proper places. When carrying out adjustment work (especially during setup and adjustment work) it is necessary to strictly adhere to the specified order of work. Often one adjustment operation affects another, and it is therefore difficult to obtain a satisfactory result unless each adjustment is made in such a way that it is not affected by another adjustment operation.

Second mistake: overtightening (or undertightening) nuts and bolts. Overtightening nuts and bolts will usually cause failure, while undertightening can cause the fastener to vibrate and fail, especially on aluminum parts. It is necessary to follow torque specifications and use a torque wrench during assembly. If the torque is not specified, remember that using the correct tool will prevent you from over-tightening the fastener. The thread pitch is often so small that the force you apply to the wrench is many times greater than the force actually applied to the part you are screwing in. When installing spark plugs, especially when the spark plugs are screwed into an aluminum cylinder head, it should be remembered that too little torque will not be able to press the gasket tightly, and this will cause leakage of combustion gases and, consequently, overheating of the spark plug and engine parts. Too much torque can damage the threads and deform the spark plug, which will change the spark gap of the electrode.

Based on the above, it is recommended to purchase a torque wrench.

The third mistake: twisting the threads. Thread twist occurs when a part, such as a bolt into a nut or a casting, is driven at an incorrect angle, or if excessive force is applied to the part, causing damage to the threads. Thread twisting most often occurs in areas that are difficult to access. In such cases, it is recommended to clean and lubricate the fasteners and begin screwing in the part of the part that is installed straight, guiding it with your fingers. If you encounter resistance, unscrew the part and try installing it at a different angle until it fits into its socket and can be turned without much effort. Do not install the wrench on the part until it has been screwed in a few turns by hand. If you feel resistance and the part does not fully seat, do not apply further force! Unscrew the part, check its cleanliness, and ensure it is screwed in correctly.

Never rush and be patient. Once you gain some experience, repairing your car will become an enjoyable hobby for you.

Whenever a specific torque value is required to be applied to a fastener, it will be indicated in the appropriate place. If such data is not available, it is recommended to apply the following torques in accordance with the dimensions of the fasteners.

Bolts without designation

6mm bolt/nut: 7-8 Nm
8mm bolt/nut: 16-23 Nm
10mm bolt/nut: 31-46 N·m
12mm bolt/nut: 56-80 N·m
14mm bolt/nut: 76-103 N·m

Bolts designated 88 and above