Special Turning Tools

Special Turning Tools

This tool is used for turning differential bearing nuts and other similar components. It is, for example, ideal for holding the input flange to a rear wheel

Many special tools of this type are available

drive axle, as the main nut is undone. Many workshops have ‘home made’ versions. Most types are adjustable so they will fit a variety of applications.

Jacks and Stands Most jacks are simple hydraulic devices. Remember to make sure the safe working load (SWL) is not exceeded. Ensure that any faults with equipment such as this are reported immediately. Axle stands must always be placed under the vehicle supporting the weight – before work is carried out.

Ramps and Hoists Many ramps are available ranging from large four-post wheel-free types to smaller single-post lifts. These

large items should be inspected regularly to ensure they are safe.

Transmission Jack If a complete gearbox has to

be removed, it is likely to be heavy! A transmission jack has attachments that allow you to support the This jack will gearbox and lower it safely. The equipment is support a

gearbox

hydraulically operated just like an ordinary jack. Often, the height can be set by using a foot pedal, which leaves both hands free for positioning the unit.

Bearing Puller Removing some bearings is difficult without a proper puller. For internal bearings, the tool has small legs and feet that hook under the

Internal and

bearing. A threaded section is tightened to pull out external

bearing pullers

the bearing. External pullers hook over the outside of the bearing and a screwed thread is tightened against the shaft.

Air Tools The whole point of power tools is that they do the work so you don’t have to! Air guns produce a ‘hammer’ action. Because of this, impact These tools

sockets should be used. Normal sockets can are very useful shatter under this load. It is important to

remember that air tools need lubricating from time to time. Air ratchets are very useful for removing or fitting nuts and bolts. However, it is possible to over tighten if care is not taken. Air tools can be very powerful and will trap your hands! Take adequate precautions at all times.

Slide Hammer A slide hammer is a form of puller. It consists of a steel rod over which a heavy mass slides. The mass is ‘hammered’ against a stop, thus These tools

applying a pulling action. The clamp end of the tool are useful for

removing

can screw either into, or onto, the component.

halfshafts

Alternatively, puller legs with feet are used to grip under the sides of the component.

Grease Gun A grease gun is a simple device that pumps grease under pressure. A special connector fits onto a grease nipple. Some types are air operated but the one shown here is a simple pump action type.

 Look back over the previous section and write out a list of the key bullet points here:

ROUTINE MAINTENANCE

Scheduled Servicing Scheduled service requirements are often quite simple but none-the-less important. Systems should be checked for correct operation. Adjustments, repairs or replacements are then made if required. The servicing requirements for the driveshafts are limited but none-the-less important.

Worksheet Service final drive and differential

Jack up and support the vehicle or raise it on a hoist. Inspect the area around the final drive and differential unit for oil leaks. If necessary clean off old oil, road test and check again. Pay particular attention to the main gasket seals and the driveshaft output oil seals and/or the pinion input seal. Remove the filler/level plug and check the oil level. The oil should be level with or just below the threads of the plug. Check with a finger or probe if necessary.

Front Wheel Drive If topping up is necessary, refer to the manufacturer’s specifications for the correct oil. On many front wheel drive cars, the oil for the final drive and differential is the same as for the main gearbox because the units are combined. Some vehicles should have the oil changed at certain intervals. If this is the case, drain out the old oil into a tray. It is better to do this after a road test during which time the oil will become warmer and therefore drain out more easily. Some rear axle final drive and differential units do not have a drain plug. In this case, the cover must be removed to drain oil.

Rear Wheel Drive On rear wheel drive vehicles with fixed axles and halfshafts, it may be necessary to check for oil leaks into the brake drums on the rear. This would normally be carried out during servicing of the brakes. Refit any plugs and covers that were removed. Lower the vehicle to the ground.

Worksheet Service 4WD/AWD final drives and

differentials This operation is similar to the previous task. However,

4WD/AWD vehicles have three differentials and a transfer box. Raise and support the vehicle or use a hoist. Check and top up oil levels; front gearbox/ final drive and/or transfer box and rear differential. Check all seals and gaskets for leaks. Check security and condition of all mountings and drive joints.

Electronic Systems Some four-wheel drive systems are now electronically controlled. If so, carry out a fault code check of the system. Dedicated test equipment may be required.

However, a ‘fault memory’ warning light will be lit if a problem is stored in memory.

 Look back over the previous section and write out a list of the key bullet points here:

CUSTOMER CARE

Regular Checks Regular servicing is vital for a customer’s safety. Carry out checks at all services and report your findings to the customer. Advise customers if anything will need attention before the next scheduled service interval.

Vehicle Condition Respect your customer’s vehicle and take precautions to keep it clean. Repairing or checking some systems, is likely to involve you working under the vehicle, and then sitting in the driver’s seat. Use seat covers and ensure the steering wheel is clean when you have finished.

Keep Customers Informed Some customers like to know details of what work has been done to their vehicle – and they

have every right to know! This driveshaft gaiter had split and unfortunately, the CV joint had been damaged due to loss of lubrication and dirt getting in. The customer appreciated having the situation explained.

Test Drives Take the customer on a test drive if necessary. It is a useful way of helping them to describe problems to you. Alternatively, they could drive and demonstrate what is concerning them. Simple problems like wheel bearing noise can

be diagnosed easily in this way.

Shifting Should a customer express concern about shifting (gear changing), carry out a few simple checks before removing the transmission. With the engine stationary, check that the clutch pedal and gear lever can move freely. Check for correct fitment of mats, rubber gaiters and sound damping material. Look for play and wear in the gear lever guide and engagement of the shift rod bolt in the universal joint. With the engine running, check for correct clutch disengagement.

Transmission Noises Should a customer express concern about transmission noises, a few simple checks should be carried out

before carrying out any repairs. Check that the outer and inner rubber gaiters, and the sound damping material are fitted correctly on the gear lever. Make sure that the transmission is correctly filled with transmission fluid.

Leaks Should a customer express concern about fluid leaks, the leak must be located before attempting any repairs. Clean the transmission and add some fluorescent

additive to the transmission oil. Road test This oil leak was obvious! the vehicle and then locate the leak using

an ultraviolet lamp.

Summary A customer, who is kept informed and treated with respect, will return and keep you in a job! Explain things to a customer when asked – it will be appreciated.

 Look back over the previous section and write out a list of the key bullet points here: