0303492 JOHNSON NIPPLE,Cyl.

Walk-Around Inspection
Inspect Engine for Leaks and Loose Connections
Inspect Engine Before Starting
A walk-around inspection is recommended to ensure the installation is clean and leaks are kept to a minimum. This should only take a few minutes and by taking the time to make these checks, costly repairs and accidents can be avoided and the equipment will be ready to run should the need arise.For maximum service life of your engine(s), make a thorough inspection before starting the engine. Look for such items as oil or coolant leaks, loose bolts, worn belts, loose connections and trash build-up. Remove trash build-up and have repairs made as needed.
Accumulated grease and oil on an engine or deck is a fire hazard. Remove this debris with steam cleaning or high pressure water, Every 2000 Hour interval or any time fluid is spilled on an engine or deck (platform).
Check the fluid levels more frequently than the recommended maintenance intervals and continue to monitor fluid levels until any leak is found and fixed. If leaking is observed, find the source and correct the leak. If leaking is suspected, check the fluid levels more frequently than the recommended intervals.* Wipe all fittings, caps and plugs before performing maintenance to reduce the chance of system contamination. Inspect: * Jacket water pump for coolant leaks. * Raw water pump for coolant leaks. The water pump seal is lubricated by coolant in the cooling system. It is normal for a small amount of leakage to occur as the engine cools down and parts contract. If leaks are found, check the coolant level frequently and continue to monitor the level until the water pump is repaired. Excessive coolant leakage may indicate the need to replace the water pump seal.For removal and installation of water pumps and/or seals, see the Service Manual for this engine or consult your Caterpillar dealer.* Air intake system hoses, piping and elbows for cracks and loose clamps. Check the condition of all connections and fittings. Inspect:* Lube system for oil leaks, such as front and rear crankshaft seals, oil pan, oil filters and valve covers.* Fuel system for leaks, loose or worn hoses, and loose fuel line clamps and fittings that are properly clamped and tight. Check condition of gauges. Replace if cracked or cannot be calibrated.While operating, frequently observe the engine oil pressure, oil filter differential, fuel pressure, fuel filter differential, water temperature and the air cleaner differential gauges.All guards must be in place. Repair or replace missing or damaged guards.* Disconnect any battery chargers that are not protected against the starting motor current drain. Check condition of batteries and the level of electrolyte, unless equipped with a maintenance free battery. Refer to OEM or vessel manufacturers' recommendations for battery maintenance. * Check condition of all belts for cracks, breaks or other damage. Replace if necessary.Belts for multiple groove pulleys must be replaced as matched sets. If only one belt of a two or three belt set is replaced, it will carry more of a load than the belts not replaced since the older belts are stretched. The additional load on the new belt could cause it to break.Engine Crankcase
Make sure you read and understand the information in the Safety and Lubricant Specifications sections of this manual before you proceed with maintenance of the lube oil system.
Check Oil Level
Check the engine crankcase lube oil on a daily basis. Be sure to read the correct side of the dipstick. The ADD and FULL levels are not the same when checking the oil while the engine is stopped or idling.The dipstick is stamped on both sides of the blade.* One side is marked to be read when checking the oil level with the ENGINE STOPPED.* The other side is marked to be read with the engine running at LOW IDLE. * Maintain the oil level to the FULL mark (between the ADD and FULL RANGE zone) on the ENGINE STOPPED WITH OIL COLD side of the dipstick. Do not fill the crankcase above the FULL RANGE zone. * Remove oil fill cap and add oil if necessary. DO NOT fill the crankcase above the FULL mark on the dipstick.
Do NOT overfill to reach above or to the top of the FULL mark on the dipstick.
Operating your engine when the oil level is above the FULL Range zone could cause your crankshaft to dip into the oil. If this occurs, air bubbles may be created from the crankshaft dipping into the oil will reduce the lubricating characteristics of your oil.A crankshaft that dips into the oil during engine operation, would result in a loss of power and a possible alarm from high crankcase pressure.* If the engine is equipped with an oil level make-up system, fill to, and maintain to the FULL-COLD mark. Remote mounted or auxiliary filters require additional oil. For all information pertaining to auxiliary filters, refer to the OEM or filter manufacturer's recommendations and instructions for all information regarding auxiliary oil filters.Estimating Oil Consumption
Oil consumption, along with fuel consumption and maintenance information, can be used to estimate total operating cost for your Caterpillar engine. It can also be used to estimate the capacity of a makeup oil system required to accommodate your maintenance intervals.Oil consumption is somewhat proportional to the percent load at which the engine is operating. The higher the percent load, the higher the amount of oil consumed per hour.The oil consumption rate, or BSOC (brake specific oil consumption), measure is grams/brake kW-hour (lb/bhp-hour). The BSOC varies depending on the load on your engine. The established typical mid-life BSOC values for your engine can be determined by contacting your Caterpillar dealer for assistance in determining typical oil consumption for your engine.Oil Consumption as an Overhaul Indicator
When an engine's oil consumption has risen to three times the initial (new) consumption rate due to normal wear, then the engine should be scheduled for overhaul. There may be a corresponding increase in blowby and also a slight increase in fuel consumption.