The Engine tunning deals with the procedure which includes testing the various components and accessory systems involved in engine operation. Tunning goes further than mere testing. It also includes readjusting or replacing parts as required to restore new engine performance. In some cases, during the tunning, serious troubles may be uncovered that will require major repair work. In other words, engine tuning is a procedure to make an engine in good mechanical good condition to operate at peak efficiency and power. Every unit of the engine is made to function at its best.
Engine tunning is more frequently required in modern high-compression engines, Which are more sensitive to variants from specifications than the earlier low-speed, low-output engines. To maintain an engine at peak performance and economy, it must be kept in good condition with all components up to specifications. Often during the engine tunning, several conditions will be found which must be corrected to restore the engine to like new condition.
A typical tuning or tune-up procedure is given below, which includes visual and mechanical checks and also checks with instruments. Some of the checks are not related to the engine but should be done for safety purposes. The procedures are-
- Loose spark plugs, start the engine to blow out carbon and dirt, shut off the engine and remove the plugs.
- Test engine compression.
- If the compression ratio is not up to specifications, perform engine services that will eliminate the trouble. If the compression is all right, re-install the spark plugs.
- remove the distributor cap, clean it and visually check it for carbon tracks, chips, and corroded terminals. Replace it, if it is not in good condition.
- Clean and inspect the rotor and replace it if it is not in good condition.
- Inspect the high-tension leads and if they have cracked, or frayed insulation or wires or damaged, replace them.
- Check distributor centrifugal advance.
- Test the vacuum advance.
- Check distributor contact points and clean them. Read just the point opening.
- Re-install the distributor cap and replace the wiring.
- Check the battery state of charge, and water and hold down the clamps.
- Check battery cables for damage, corrosion, and loose connections and make necessary connections.
- If the battery has been overcharged or undercharged, check the alternator and regulator.
- Check drive belts and tighten or replace them as required.