824 TRACTOR Operating Starting Aids Caterpillar

Operating Starting Aids
1.1. Glow Plugs
2.1. Ether Starting Aid

Ease of starting the diesel engine can best be obtained by following the instructions closely giving particular attention to the glow plug heating time and ether capsules to use. For easy cranking, quicker starting and rapid oil distribution, the coolant and crankcase lubricating oil should be warmed under conditions as indicated in the chart. When heating the cooling system, the coolant temperature should be maintained between + 15°F. and +30°F. (-9°C. and -1°C.).

Helpful suggestions for starting the diesel engine in cold weather are in the topic, STARTING IN COLD WEATHER.

The controls should be positioned as instructed in the topic covering the method of starting to be used, and the following additional instructions should be carefully followed. This will permit the quickest possible start and conserve the battery. See the STARTING AID CHART.

Glow Plugs

The glow plugs preheat the combustion chambers so that a minimum of cranking time is required. Turning the HEAT-START switch, to the HEAT position causes the glow plugs to heat.

1. To heat the glow plugs, move and hold the HEAT-START switch in the HEAT position for the length of time necessary as indicated in the STARTING AID CHART.


NOTE: Each glow plug uses approximately 5 amperes while the switch is in the HEAT position. This is actually a small amount in comparison to the starter load of possibly as many as 800 amperes that is imposed on the battery when the switch is in the START position.

2. Move the switch to the START position to crank the engine. As soon as the engine starts, move the switch to the HEAT position until the engine is running smoothly.

When using glow plugs and the engine fails to start after 10 seconds of cranking, the HEAT-START switch, should be released. Turn and hold the HEAT-START switch in the HEAT position for about 30 seconds before cranking the engine again. Reheating glow plugs after 10 seconds of cranking makes the glow plugs more effective and conserves the battery.

Do not turn the HEAT-START switch to the HEAT position while the engine is warm and running.

Ether Starting Aid

Ether ignites very readily so it can be used to assist starting. Pressurized ether dispensers or an ether starting aid attachment should be used with care as outlined in the following instructions.

If a pressurized ether dispenser is to be used as a starting aid, carefully spray ether toward the air cleaner inlet while cranking the engine. For proper handling of pressurized ether dispensers, follow the manufacturer's instructions printed on the dispenser.

The ether starting aid attachment available from your AVSpare dealer provides ether in metal capsules of a definite size to limit the quantity of ether to be injected. A discharger is used to inject ether into the inlet manifold. When the discharger lever is moved the metal capsule is pierced. Ether is forced out of the capsule by a small quantity of gas, under high pressure, into the inlet manifold to be taken into the cylinders for quick starting. To operate the starting aid attachment proceed as follows:

1. Load the discharger by unscrewing the nut (2), removing the spent capsule and placing the new capsule (3) in the discharger as shown. Install the nut finger tight.
2. Move the HEAT-START switch to the HEAT position for the length of time necessary as indicated in the STARTING AID CHART.
3. Discharge ether by moving the discharger lever (1) to pierce the capsule.

Actual experience will determine the amount of ether required for easy starting.

4. Start the engine using the starting method provided.

1-Discharge lever. 2-Nut. 3-Capsule.

Be sure the spent capsule is left in the discharger when the engine is running and the nut (2) is finger tight on the discharger to keep dirt out of the engine.


Use only enough ether to start the diesel engine or keep it running if the engine starts to stall. Do not discharge more than 2 ether capsules without cranking the engine.

If more than one capsule is needed, discharge the first two capsules and install the second set of capsules in the dischargers before cranking the diesel engine. The discharge of the second set of capsules can be performed when the engine has been cranked a few revolutions, or when it starts to stall.