Cooling System Add coolant to overfl ow reservoir as required, which is a 50/50 mixture of ethylene glycol and water (distilled or deionized water is recommended). 4. Drain cooling system. 5. Fill cooling system. Filling Cooling System NOTE: To prevent engine damage, do not use antifreeze mixture greater than 70% ethylene glycol in cooling system. Do not use antifreeze with stop-leak additive(s) or mix/add other additives to cooling system. Use only ethylene glycol antifreeze. Cooling system capacity is approximately 2 liters (2.18 qt.). 1. Check condition of cooling system hoses, clamps, and associated components. Replace as required. 2. Fill with 2.0 L (2.1 U.S.
qt.) equal parts of ethylene glycol (anti-freeze) and water only. Distilled or deionized water is recommended, especially in areas where water contains a high mineral content. Propylene glycol based anti-freeze is not recommended. 3. Fill radiator with coolant mixture. Allow coolant to drain into lower areas. Fill overfl ow reservoir to a level between FULL and ADD marks. Reinstall radiator and reservoir caps. 4. Start and run engine for fi ve minutes. Stop engine and allow to cool. 5. Recheck coolant level in reservoir. Coolant level should be between FULL and ADD marks. Add coolant to reservoir if required. Drain Cooling System Radiator Drain Plug Details 1. Ensure engine is cool.
When radiator is cool to touch, slowly loosen radiator cap to fi rst stop and allow any pressure to bleed off. Then loosen it fully and remove it. Loosen/remove radiator drain plug and allow coolant to drain. 2. If equipped, remove coolant drain plugs located on each side of engine block. Drain coolant into a suitable container. After coolant has drained completely, apply pipe sealant with Tefl on ® (Loctite ® PST ® 592™ or equivalent), to threads and reinstall plugs. Torque plugs to 36.7 N·m (325 in. lb.). 3. Remove overfl ow hose from reservoir. Unhook inboard retainer and slide reservoir out of supports. Pour out contents and wash or clean as required.
Dispose of all old coolant in accordance with local ordinances. 4. Reinstall reservoir cap. Do not kink/pinch hose. 5. Flush cooling system. Inspection Cooling Fan Assembly, Belt, and Drive Pulleys Cooling fan assembly, used to draw air through radiator, is attached to a hub and pulley assembly with sealed ball bearings. This assembly is belt driven off fl ywheel, via a lower split pulley, and requires very little service or maintenance. DO NOT operate engine without fan and properly functioning cooling system or engine damage will occur. 1. Inspect fan for any cracks, damaged/missing fan blades, and secure mounting. 2.
Bearings in hub of pulley should rotate smoothly, without roughness, binding, or play/wobble. 3. V-groove of each pulley (upper and lower) should not be bent, nicked, or damaged. Pulley mounting areas and lower pulley shims should be free of any cracks or elongation. 4. Drive belt is designed and constructed for this system. Do not use a substitute belt. Check overall condition and replace belt if cracked, damaged, or proper tension cannot be established by repositioning of lower pulley shims. Use only Kohler Part No. 66 203 02-S belt if replacement is necessary. See a Kohler authorized dealer for any necessary service. Flushing Cooling System NOTE:
To prevent engine damage, do not pour water into a hot engine. Do not operate engine without coolant. With system properly drained: 1. Fill cooling system with clean water and a cooling system cleaner recommended for aluminum engines. Follow directions on container. 2. Reinstall and tighten radiator cap. 3. Start and run engine for fi ve minutes, or until it reaches operating temperature. Stop engine and allow it to cool. 39 66 690 01 Rev. C KohlerEngines.com A A Radiator Drain Plug