Clutch Course Flashcards
Course Objectives
Identify clutch components
Course Objectives
Demonstrate the inspection clutch components
Course Objectives
Explain the operation of clutch components
Course Objectives
Describe in-vehicle and out-of-vehicle resetting process
Course Objectives
Diagnose clutch and transmission system
Component Identification
Intermediate plate
Component Identification
Driven discs (front & rear)
Component Identification
Flywheel
Component Identification
Clutch cover and release bearing
Component Identification
Pilot bearing
Component Identification
Clutch brake
Hydraulic control system
Clutch Cover (pressure plate) & release bearing assembly
Constructed of either stamped steel or cast iron and will be bolted to the flywheel. Contains the pressure plate, which is fitted to the cover with pressure springs. Contains the release bearing and levers, which move the pressure plate back and forth, thereby making or breaking contact with the disc assembly.
Interference Fit Technology
An interference fit, also known as a press fit or friction fit is a fastening between two parts which is achieved by friction after the parts are pushed together, rather than by any other means of fastening
Transmission input shaft
Rotating shaft that receives power from the power source and introduces it into a mechanical system
Rear main seal
Rear main seals are not to be replaced due to clutch replacement
non leaking rear main seals, once replaced, have a higher chance of leaking due to replacement.
Flywheel
Flywheel runout spec is .008
Pilot bearing bore runout is .005. Flywheel housing ID runout is .008. Flywheel housing face runout is .008. Depth of scores or cracks limited to .040. Check with OE for min. thickness spec. Inspect for excessive gouges, smoothness, hot spots & heat cracks. Resurfacing guidelines. Use good judgement when deciding to send out a flywheel for machining and seek advice from shop manager if you have -estons.
Flywheel housing ID run out
Secure dial indicator base to crankshaft
Put gauge finger against flywheel housing Id. Rotate flywheel one revolution. Max runout is .008
Clutch Primary Purpose
Clutch secondary purpose
Transfer power from engine/flywheel to transmission. Following is how that happens: At the point where the clutch engagement begins (clutch pedal partially released), the transmission shaft may be stationary, as when vehicle is not moving, or it may be rotating at a different speed than the flywheel, as in the case of up-shifting. Once the clutch is fully engaged (clutch pedal fully released), both the engine flywheel and the transmission input shaft will rotate at the same speed. Dampen unwanted vibrations that normally exist in the driveline system. Following is how that happens. The driven disc springs provide a flexible link between the friction surface and the disc hubs. Dampened clutch discs are specifically designed to prolong life of the drivetrain components by the reduction of vibration from the engine, non-uniform u-joint angles, and road dips/bumps.
Driven Discs
Intermediate plate
Driven by the clutch cover(commonly referred to as the pressure plate) or by the flywheel on certain clutch designs. Increases the torque capacity of the clutch by providing additional surface area for facing material.
Pilot Bearing
Contain dampers to reduce critical vibrations in today’s electronic, high horsepower engines. The proper selection of springs depends on factors such as engine, flywheel and transmission selected in truck. Contain facing material which are critical to performance as they receive the torque delivered by the engine every time the clutch is engaged. Driven disc ceramic facings have greater heat tolerance and torque capacity than organic facings. They engage quicker, reduce slip and deliver longer life. Organic facings are a non-asbestos facing that are adequate for low horsepower, on highway applications.
Pilot Bearing
Connects the manual transmission input shaft to the engine crankshaft. Allows the input shaft to rotate independently of the crankshaft. Should be replaced whenever the clutch assembly is replaced. Failure to use a clutch aligning tool can result in damage to the pilot bearing upon re-installation of the transmission
Pilot Bearing cont.
Pilot bearings when pressed in flywheel are an interference fit design
Sealed for life
Require no lube
Clutch Brake
Hydraulic Control System
Located between the release bearing housing and transmission front bearing retaining cap. Engaged by tangs to the transmission input shaft. Only use one piece brake if transmission is removed. Consists of a pedal unit and a slave cylinder, connected by a hydraulic hose and fastened with a quick disconnect clip. Pedal unit includes a hydraulic subassembly, composed of the master cylinder and reservoir, which can be removed from the pedal unit for service purposes.
