SEARCH FOR AN MOT TEST CENTRE IN 3 EASY STEPS
FIND AN MOT TEST STATION Find



UKmot.com

Car MOT Manual 2012 onwards






- 2.5 Suspension Joints and Wheel Bearingswheels jacked

Information
The inspections under this sub-section must be carried out with the vehicle over a pit or on a raised
l ift.
For many of these inspections an assistant must be used unless the test bay is ATL or OPTL approved. In these circumstances, an NT may still elect to use an assistant to aid with the inspection of components.

The inspection of front suspension components described in sub-section 2.4G, suspension arms and linkages, sub-frames etc, can be carried out in conjunction with this sub-section.

Vehicles with suspension types as shown in Diagram figure 2 and 2a must be jacked so that the suspension spring force is removed from the ball joints, i.e. suspension arms must be clear of their stops. Failure to do this can result in defective joints being overlooked.

Reason for Rejection 2 does not apply to a vehicle where it is not possible to rotate the wheel due to a design characteristic or its drive configuration.

It is not possible to lay down precise king pin/bush wear limits but the following may be helpful as a guide in determining acceptable wear at king pins.
With the wheel braked, note the total amount of movement at the wheel rim when the wheel is rocked. For a 50cm wheel this should not exceed 10mm. The maximum for other wheel diameters should be in proportion to this figure.
Method of Inspection
A. Suspension Joints and Wheel Bearings wheels jacked

1. See the VSI or Suspension Type Diagram for the jacking positions of various suspension types.
Jack up the front of the vehicle so that the front wheels are clear of the ground, observing relative vertical movement between components.
Carry out the following examinations by placing

a suitable bar under each wheel in turn and levering upwards.
a. For suspension types on Suspension Type Diagram fig 1, check for excessive vertical movement between stub axles and axle beams
b. For suspension types on Suspension Type diagram fig 2 and 2a, check for vertical movement between swivel and housing, and movement in wishbone bearings.
c. For suspension types as Suspension Type Diagram figs 3, 3a and 4, check for movement in suspension ball joints, tie bar joints and MacPherson strut upper attachment. If ATL or OPTL approved this inspection is carried out on wheel play detectors in side to side mode Repeat MoIs a, b and c above using the assistant to place a suitable bar under each wheel in turn and levering upwards while the tester examines the relevant items.

2. With the steered wheels clear of the ground, rotate each wheel in turn and listen for any sound indicating roughness in the bearing.

3. Rock each wheel by hand or, where appropriate, with a bar in the wheel. This inspection may alternatively be carried out using approved wheel play detectors in the side-to side mode.

Check:
a. the amount of movement between the stub axle and the axle beam, or
b. the movement in the swivel joints, and the security of their attachment to the stub axle and suspension arms


Note: Suspension ball joints can have free play lift as a feature of their design, and rejection is only justified when the lift exceeds the manufacturers limit.
c. the movement of the wheel relative to the stub axle, and note the amount of play in the wheel bearings.

Repeat Methods of Inspection a, b and c above using the assistant to rock the wheel by hand or where appropriate with a bar in the wheel while the tester examines the relevant items.

4. Check the presence and effectiveness of front suspension retaining and locking devices. Note: It is not always possible to determine the presence and effectiveness of certain types of locking devices e.g. locking fluid or nyloc nuts.

5. Check the condition of the axle beam and stub axles.
Reason for Rejection
A. Suspension Joints and Wheel Bearings wheels jacked

1. See the VSI or Suspension Type Diagram for the jacking positions of various suspension types.
Jack up the front of the vehicle so that the front wheels are clear of the ground, observing relative vertical movement between components.

Carry out the following examinations by placing a suitable bar under each wheel in turn and levering upwards.

a. For suspension types on Suspension Type Diagram fig 1, check for excessive vertical movement between stub axles and axle beams
b. For suspension types on Suspension Type diagram fig 2 and 2a, check for vertical movement between swivel and housing, and movement in wishbone bearings.
c. For suspension types as Suspension Type Diagram figs 3, 3a and 4, check for movement in suspension ball joints, tie bar joints and MacPherson strut upper attachment. If ATL or OPTL approved this inspection is carried out on wheel play detectors in side to side mode
Repeat MoIs a, b and c above using the assistant to place a suitable bar under each wheel in turn and levering upwards while the tester examines the relevant items.

2. With the steered wheels clear of the ground, rotate each wheel in turn and listen for any sound indicating roughness in the bearing. 3. Rock each wheel by hand or, where

appropriate, with a bar in the wheel. This inspection may alternatively be carried out using approved wheel play detectors in the side-to side mode.

Check:
a. the amount of movement between the stub axle and the axle beam, or
b. the movement in the swivel joints, and the security of their attachment to the stub axle and suspension arms

Note: Suspension ball joints can have free play lift as a feature of their design, and rejection is only justified when the lift exceeds the manufacturers limit.

c. the movement of the wheel relative to the stub axle, and note the amount of play in the wheel bearings.

Repeat Methods of Inspection a, b and c above using the assistant to rock the wheel by hand or where appropriate with a bar in the wheel while the tester examines the relevant items.

4. Check the presence and effectiveness of front suspension retaining and locking devices.

Note: It is not always possible to determine the presence and effectiveness of certain types of locking devices e.g. locking fluid or nyloc nuts.

5. Check the condition of the axle beam and stub axles.

- 2.5 Suspension Joints wheels on turning plates or on wheel play detectors if ATL or OPTL approved

Information
If ATL or OPTL approved this inspection is carried out on wheel play detectors in side-to-side mode.

On non-ATL / OPTL approved bays, the wheels must also be rocked by the assistant while the tester examines the relevant items.
Method of Inspection
B. Suspension Joints wheels on turning plates or on wheel play detectors if ATL or OPTL approved

For vehicles with suspension types as shown in Suspension Type Diagram figs 3, 3a and 4, lower the front wheels so that they:
bear the weight of the vehicle, and
are resting on turning plates which enable the wheels to be turned freely lock to lock, or
if ATL or OPTL approved resting on wheel play detectors.

Inspect as follows:
1. Grasp the top of each front wheel and rock it vigorously in and out to check for play:

a. in the upper and lower suspension ball joints and wishbone bearings
b. at MacPherson strut:
sliding bushes and glands
upper support bearings.

2. Grasp each front wheel at 3 oclock and 9 oclock, and shake vigorously to determine the condition of the outer ball joints and track control arm inner bushes.

3. Examine the condition of the bonding between the metal and flexible material in the MacPherson strut upper support bearing, if visible
Reason for Rejection
1.
a.
Excessive play in a suspension ball joint
a ball joint securing nut loose or not locked
excessive play in an upper or lower wishbone inner bearing, pin or bush cross check with sub section 2.4G MoI 3

b.
excessive play in a MacPherson strut sliding bush or gland
excessive movement in a MacPherson strut upper support bearing assembly.

2.
a. Excessive play in an outer ball joint
b. excessive play in a track control arm inner bush.

3. a. Serious deterioration of the bonding between metal and flexible material of an upper support bearing
b. a loose or insecurely locked unit in the upper support bearing assembly

- 2.5 Front Wheel Drive Shafts and Couplings

Information
Method of Inspection
C. Front Wheel Drive Shafts and Couplings

Inspect as follows while the front wheels are jacked up.

1. With the vehicle in neutral gear, rotate the wheels when they are on each lock in turn, and check visually the gaiters of the constant velocity joints while the pleats are expanded.

2. Check:
a. the front wheel drive shafts for straightness and damage
b. drive shaft couplings condition and security
c. for wear in drive shaft support bearings.
Reason for Rejection
1.
a. A constant velocity joint gaiter missing or excessively damaged, deteriorated or insecure to the extent that it would no longer prevent the ingress of dirt etc.
b. a drive shaft constant velocity joint excessively worn or insecure
c. a drive shaft coupling excessively worn or insecure
d. a drive shaft flexible rubber or fabric coupling unit severely cracked or breaking up
e. a drive shaft flexible rubber or fabric coupling softened by oil contamination, insecure or fouling any other part of the vehicle.

2.
a. A drive shaft bent or damaged
b. an insecure or fractured fastener securing a drive shaft coupling bearing
c. a drive shaft support bearing excessively worn





Reproduced from the MOT Inspection Manual by kind permission of THE VEHICLE INSPECTORATE.
This website uses cookies to ensure you get the best experience on our website More info


Got it!



MOT Test | Cookie Policy | Terms/Conditions | Copyright 2000 - 2017 UKMOT.com. All rights reserved