0303376 EVINRUDE PLATE,Impeller housing

Engine
Steam Clean
Accumulated grease and oil on an engine is a fire hazard. Remove this debris each time a significant quantity of oil is spilled on the engine.
Steam cleaning your engine is a good preventive maintenance practice because it provides you with a way to detect oil and coolant leaks. Repairing an oil or coolant leak upon detection may save you money by avoiding major repairs that could result from low oil or coolant levels.Steam cleaning the engine as recommended will also improve the engine's heat transfer characteristics.Thermostat
Replace Thermostat, Gaskets and Seal
Replacing your thermostat prior to failure is a recommended preventive maintenance practice because it reduces the chances for unscheduled downtime. Failure to replace the thermostat on a regularly scheduled basis could cause severe engine damage and added cost because of damage to other engine components.Since Caterpillar engines incorporate a shunt design cooling system, it is mandatory to always operate the engine with a thermostat.If the thermostat fails in the closed position, it will cause excessive overheating. Excessive overheating could result in cylinder head cracking or piston seizure problems.If the thermostat fails in the open position, it will cause the engine operating temperature to be too low during partial load operation. Low engine operating temperatures during partial loads could cause an excessive carbon build-up inside the cylinder. This excessive carbon build-up could result in accelerated ring and liner wear.Depending on load, a thermostat that fails in a partially opened position will cause either an overheating or an overcooling condition.Caterpillar recommends the replacement of the thermostat on a regularly scheduled basis to be the most cost effective way to operate your engine. All tools shown or mentioned in the following Disassembly and Assembly procedure are available at any Caterpillar dealer.Remove Thermostat
1. Stop the engine and allow to cool. Loosen the coolant filler cap slowly to relieve any pressure and remove the cap.2. Drain the coolant from the cooling system to a level below the thermostat housing. 3. Loosen the hose clamps and remove the radiator hose from the thermostat housing. 4. Remove the thermostat and gasket from the thermostat housing.Install Thermostat
5. Install a new thermostat in the thermostat housing.
If the thermostat is installed wrong, it will cause the engine to overheat.
6. Install a new gasket and the water outlet pipe on the thermostat housing.7. Install the radiator hose and tighten the hose clamps.8. Add coolant to the cooling system to bring it to the proper level by mixing a solution of acceptable water, Caterpillar Antifreeze or equivalent and Supplemental Coolant Additive (Conditioner) if NOT using Caterpillar Antifreeze, or if equipped with a coolant conditioner element, install the appropriate element.Refer to the Cooling System - Clean/Flush Coolant topic and Cooling System Specifications section of this publication for information about the appropriate maintenance of the cooling system or contact your Caterpillar dealer for assistance.9. Start the engine and inspect for leaks and proper operating temperature. Cooling System
Clean/Flush Coolant
Do not perform this maintenance until you read and understand the material in the Safety and Cooling System Specifications sections of this publication.This procedure is to be used for normal maintenance of cooling system surfaces to return to "like new" condition. For heavy build-up of scale and deposits, a severe acid-type commercial cleaner or mechanical cleaning will be required.
Our recommended intervals for performing maintenance on the cooling system are based on experience and gathered data relative to the performance characteristics of this engine and its components. Performing maintenance on the cooling system is important because the cooling system has a direct effect on the operation and service life of the engine.Improper maintenance can result in a variety of problems that could shorten the engine's service life or result in poor engine performance.When you drain, clean, flush the cooling system and replace the coolant, small particles, undesirable chemicals, scale and other deposit formations are removed. These deposits reduce the necessary heat transfer characteristics of the cooling system.Failure to clean the cooling system and replace the coolant as recommended will reduce the efficiency of the system and, in some cases, result in an increase in fuel consumption.Total disregard for performing maintenance on the cooling system can eventually cause engine overheating problems that could result in severe damage to the engine and its components.By performing maintenance on the cooling system, spending money on repairs that could have been prevented may be avoided.
Typical Example1. Stop the engine and allow to cool. Loosen the radiator filler cap slowly and remove the cap to relieve pressure. 2. Remove the cooling system drain plug(s). Remove the drain plug (1) on bottom of water pump housing and/or radiator. Open the cab heater valve to flush coolant from the cab heater. Remove the cylinder head drain plug from the engine. Allow coolant to drain.With the recent shortage and higher cost of new antifreeze and the disposal problems of used engine coolant, the interest in recycling the used engine coolant has sharply increased. Various methods have been proposed to reclaim used coolant for reuse in engine cooling systems.Filtering methods for reclaiming the used engine coolant do not reduce the level of chemicals in the water. The full distillation procedure is the only method acceptable by Caterpillar to reclaim the used coolant. The ethylene glycol and water obtained from this process can be treated with new chemical corrosion inhibitors to provide a like-new coolant.Commercial units are available to do this distillation process. Contact Caterpillar Service Technology Group:Outside Illinois: 1-800-542-TOOLInside Illinois: 1-800-541-TOOLCanada: 1-800-523-TOOLRefer to Service Magazine article dated November 13, 1989 and/or Engine News article dated November 1989 for information regarding disposal and recycling of used coolant.3. Clean and install all drain plugs and/or close the drain valve.
Use of commercially available cooling system cleaners may cause damage to aluminum cooling system components. Use only cooling system cleaners that are approved for engines that have aluminum cooling system and engine components.DO NOT use a cooling system cleaner that contains tri-sodium phosphate; it will damage the aluminum components in the engine.
4. Refill the cooling system with clean water mixed