Nissan:: Patrol:: Diagnostics of malfunctions of a forward suspension bracket

2.12. Diagnostics of malfunctions of a forward suspension bracket

Suspension bracket of spring type

Noise in a suspension bracket take place

The shock-absorber and/or its support is faulty. Replace defective components.

Bearings of naves of forward wheels are damaged, or their adjustment is broken. Modify a pretightness, or replace defective bearings.

Nuts or plugs of a forward spring earring are worn-out (see an accompanying illustration), or the effort of tightening of fixture weakened. Replace defective components, tighten fixture.

The anchor finger or the plug of a spring are worn-out, or their landing weakened. Replace defective components, tighten fixture.

It is broken one or more sheets of a spring. Replace defective sheets, or entirely a spring.

Stupichny bearings of assembly of a rotary fist are damaged. Check a condition of bearings, make necessary repair, or replace defective components.

The bridge case is deformed. Replace a case.

The spring collar is broken, or its fastening weakened. Tighten fixture, or replace a defective collar.

The spring step-ladder is broken, or its fastening weakened. Tighten fixture, or replace defective step-ladders.

For assessment of degree of wear of plugs of an earring and an anchor finger of a spring start the lever between a loop of a spring and the chassis and move them a spring up-down. At the same time the weight of the car has to fall on a suspension bracket (see an accompanying illustration). Visually examine sheets of a spring on existence of cracks and other damages. In view of the high power of springs of a suspension bracket it is inexpedient to check a condition of shock-absorbers of a suspension bracket on the car. Shock-absorbers should be removed and checked according to the description provided further in this Section.

The provision of forward wheels of the car in relation to back is violated

Bolts of step-ladders of forward or back springs of the car weakened. Check the central bolt, tighten U-shaped bolts of step-ladders (see an accompanying illustration).

The central bolt of a lobby or back spring is broken. Replace a bolt.

The main leaf of a lobby or back spring behind a basic plate is broken. Replace the main leaf or a spring assembled.

The anchor finger or forward earring of a spring is broken. Replace defective components.

Strong sagging of a spring from one of car boards takes place. Replace springs from both boards.

The bridge case is deformed. Replace a case.

For correctness check an arrangement of the forward bridge measure distance from a reference (reperny) point on a bridge case to a reference (reperny) point on the chassis. Repeat measurement between equivalent reference (reperny) points from other board of the car. Results of measurements have to coincide.

Course stability of the car is broken

Too poorly or tires are pumped unevenly up. Modify pressure of a rating of tires.

Plugs or nuts of an earring of a spring are worn-out, or the effort of tightening of the last weakened. Tighten fixture, or replace defective components.

Forward or back springs are worn-out or broken. Replace a defective spring together with opposite the same suspension bracket (forward or back).

In view of the high power of springs of a suspension bracket it is inexpedient to check a condition of shock-absorbers of a suspension bracket on the car. Shock-absorbers should be removed and checked according to the description provided further in this Section.
If the front of the car is tilted in one or other party, remove the corresponding spring and compare it to new. If the spring is found unsuitable for further use, it will be reasonable to replace it together with opposite. The same concerns a car back.

Suspension bracket on screw springs

Noise in a suspension bracket take place

The shock-absorber and/or its support is faulty. Check, examine rubber pillows of support of shock-absorbers on existence of signs of aging (see an accompanying illustration). Replace defective components.

Bearings of naves of forward wheels are damaged, or their adjustment is broken. Modify a pretightness, or replace defective bearings.

Bolts or nuts of plugs of a suspension bracket weakened. Give the corresponding fixture completely, then tighten it with the required effort by means of a dynamometer key.

Plugs or bolts of the pushing suspension bracket bars are worn-out. Remove components for check of their state. In case of need make replacement.

Support of the stabilizer of cross stability (see an accompanying illustration) or spherical support are worn-out, or their fastening weakened.

The screw spring is broken. Replace a spring together with the second.

Bearings of assembly of a rotary fist are faulty. Check, execute the corresponding repair or replacement.

The bridge case is deformed. Replace a case.

For assessment of degree of wear of plugs of a cross jet bar ask the assistant to rotate a steering wheel within the course of 30 cm from the center in each of the parties to the left-to the right. The excessive side play of plugs will testify to their wear. Car weight during this check has to fall on wheels.
Plugs of shock-absorbers can be checked by slow rocking of a front of the car in the vertical plane (again resort to the help of the assistant). Let's allow only very insignificant side play in plugs.

The provision of forward wheels of the car in relation to back is violated

Plugs of the pushing suspension bracket bars are worn-out, or their fastening weakened. Check (see an accompanying illustration), tighten fixture, or replace defective components.

The pushing bars or their reference points are damaged or deformed. Compare dimensional characteristics of the pushing bars to obviously serviceable detail.

Strongly the screw spring from one of car boards sank. Replace springs in couple.

The bridge case is deformed. Replace a case.

For correctness check an arrangement of the forward bridge measure distance from a reference (reperny) point on a bridge case to a reference (reperny) point on the chassis. Repeat measurement between equivalent reference (reperny) points from other board of the car. Results of measurements have to coincide.

Course stability of the car is broken

Too poorly or tires are pumped unevenly up. Modify pressure of a rating of tires

Serviceability of functioning of the shock-absorber of a suspension bracket is broken. Check, replace the defective block (preferably together with the second shock-absorber of this suspension bracket).

Plugs of a cross jet bar are worn-out, or their fastening weakened. Replace plugs, or tighten fixture (see an accompanying illustration).

Plugs of the pushing suspension bracket bars are worn-out, or their fastening weakened. Replace plugs, or tighten fixture.

The lobby or back screw spring is broken or sank. Replace a spring together with the second the same suspension bracket (forward or back respectively).

If the front falls from one board stronger than from another, remove the corresponding screw spring and compare its characteristics to new. If the spring is found not suitable for further use, replace it together with the second. The same concerns also car back springs.