GENERAL 21 3.2.4 GENERAL INSPECTION 1. Never inspect a component for wear or dimensional check unless it is absolutely clean; a slight smear of grease can conceal a failure. 2. When a component is to be checked dimensionally against figures quoted for it, use correct equipment (surface plates, micrometers, dial gauges, etc.) in serviceable condition. Makeshift checking equipment can be dangerous. 3. Reject a component if its dimensions are outside limits quoted, or if damage is apparent. A part may, however, be refitted if its critical dimension is exactly limit size, and is otherwise satisfactory. 4. Use ’Plastigauge’ for checking bearing surface clearances. Directions for its use and a scale giving bearing clearances in 0.0025 mm steps are provided with it. 3.2.5 JOINTS AND JOINT FACES 1. Always use correct gaskets where they are specified. 2. Use jointing compound only when recommended. Otherwise fit joints dry. 3. When jointing compound is used, apply in a thin uniform film to metal surfaces; take great care to prevent it from entering oil-ways, pipes or blind tapped holes. 4. Remove all traces of old jointing materials prior to reassembly. Do not use a tool which could damage joint faces. 5. Inspect joint faces for scratches or burrs and remove with a fine file or oil stone; do not allow removed material or dirt to enter tapped holes or enclosed parts. 6. Blow out any pipes, channels or crevices with compressed air, fit new ’O’ rings or seals displaced by air blast. 3.2.6 FLEXIBLE HYDRAULIC PIPES, HOSES 1. Before removing any brake or power steering hose, clean end fittings and area surrounding them as thoroughly as possible. 2. Obtain appropriate plugs or caps before detaching hose end fittings, so that ports can be immediately covered to exclude dirt. 3. Clean hose externally and blow through with airline. Examine carefully for cracks, separation of plies, security of end fittings and external damage. Reject any hose found faulty. 4. When refitting hose, ensure that no unnecessary bends are introduced, and that hose is not twisted before or during tightening of union nuts. 5. Containers for hydraulic fluid must be kept absolutely clean. 6. Do not store brake fluid in an unsealed container. It will absorb water, and fluid in this condition would be dangerous to use due to a lowering of its boiling point. 7. Do not allow brake fluid to be contaminated with mineral oil, or use a container which has previously contained mineral oil. 8. Do not re-use brake fluid bleed from system. 9. Always use clean brake fluid to clean hydraulic components. 10. Fit a cap to seal a hydraulic union and a plug to its socket after removal to prevent ingress of dirt. 11. Absolute cleanliness must be observed with hydraulic components at all times. 12. After any work on hydraulic systems, inspect carefully for leaks underneath the vehicle while a second operator applies maximum pressure to the brakes (engine running) and operates the steering.
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