Automobile engines are mounted on the frame. According to the type of mounting used, is attached to the frame at two, three, or four points. At each mounting point, a flexible or elastic medium, like rubber or spring is usually placed to insulate the automobile frame and body from vibration and noise.
A method of engine mounting is called floating power in which only two rubber supports are used one at the front and another at the rear of the engine. The front support is located above the rear backing so that a line is drawn through the centers of the show and the back supports pass through the center of gravity of the engine.
It is necessary to remove the engine from the vehicle for overhaul. The procedure for removing the engine is as follows :
I. Drain the cooling system by opening the drain cock.
2. Disconnect the battery at the positive terminal to avoid the possibility of a short circuit.
3. Remove the air cleaner horn from the carburetor and disconnect the breather hose at the oil filler pipe.
4. Disconnect the carburetor choke and throttle controls by loosening the clamp bolts and set screws.
5. Disconnect the fuel tank to the fuel pump line by unscrewing the connecting nut.
7. Remove the radiator stay bar.
8. Remove the upper and lower radiator hoses by loosening the hose clamps and slipping the clamps back on the hose.
9. Remove the four bolts from the fan hub and remove the fan hub and fan blades.
10. Remove the radiator attaching screws, and remove the radiator.
11. Remove the starting motor cables. Remove the starting motor.
12. Disconnect the wires from the generator/alternator. Disconnect the ignition primary wire at the ignition coil.
13. Disconnect the oil pressure and temperature sending unit wires at the units.
14. Disconnect the exhaust pipe at the exhaust manifold by removing the stud nuts.
15. Remove the two nuts and bolts from each front engine support. Disconnect the engine ground strap. Remove the engine supports. This will allow the engine to drop slightly and will permit excess to the two top bolts on the flywheel housing.
16. Remove the rocker arm cover by removing the two holding ruts.
17. Remove two cylinder head bolts. Fit a suitable engine lifting bracket in place and re-tighten the cylinder head bolts previously removed. Attach the engine lifting bracket to a chain hoist or other lifting device. Take up all slacks.
18. Remove the bolts which attach the flywheel housing to the engine
19. Pull the engine forward or roll the vehicle backward until the clutch clears the flywheel housing. Lift the engine from the vehicle.
For disassembling the engine, it should be mounted in a suitable engine repair stand is not available, disassembling should be done in a careful manner to prevent accidents and damage to engine parts. Engine disassembly is carried out in a sequence as follows, assuming that the engine is out of the vehicle, all the accessories have been removed and the oil has been drained :
1. Remove the water pump — check bearing play, gasket facing, and free movement of the impeller.
2. Remove the exhaust manifold — check the correct sequence of nut bolts, and gasket.
3. Remove the water outlet fitting — check the corrosion or leakage of water.
4. Remove the thermostat — check the thermostat’s opening temperature.
5. Remove the crankshaft pulley — check the grove and key segment.
6. Remove the oil pump — check the vanes and gear and relief valve.
7. Remove rocker arm assembly — place them in the same order as installed.
8. Remove the cylinder head — check the bolt opening sequence and surface sealing.
9. Remove the oil pan.
10. Remove piston and connecting rod assembly — direction and cap be matching.
11. Remove the timing gear cover — check the marking of the timing gear.
12. Remove the flywheel housing.
13. Remove clutch — check clutch facing, and damper spring.
14. Remove the flywheel — check the war facing, and gear damage.
15. Remove crankshaft — check bearing wear, scratch, and damage.
16. Remove exhaust valves and springs — check the burning, and surface contact.
17. Remove the camshaft — check the wear and damages.
18. Remove valve tappets — check the gap and wear.
19. Remove oil gallery plugs — must be clean.
After disassembling all the parts, inspect them carefully, replace the defective parts, and re-assemble the engine.