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Cummins/Onan — Running

For these Cummins/Onan models: MCGBA, MCGCA, MCGDA, MCGDB, MCGGA, MDGDA, MDGDB, MDGDC, MDGDD.

Applies to: Cummins Onan Mcgba, Cummins Onan Mcgca, Cummins Onan Mcgda, Cummins Onan Mcgdb, Cummins Onan Mcgga, Cummins Onan Mdgda, Cummins Onan Mdgdb, Cummins Onan Mdgdc, Cummins Onan Mdgdd

Procedure

  1. 5-3 EXHAUST SAFETY GUIDELINES AND CHECKLIST Engine-driven generators can produce harmful lev- els of CO, causing injury or death. Reduce this haz- ard by having your generator checked on a routine basis for rusting, corrosion, damage caused by fa- tigue and vibration, and normal wearing out of parts. Areas to inspect include: • Water injection elbow • Exhaust manifold • PIpe nipple between water injection elbow and exhaust manifold • Cylinder head gasket • Exhaust pipe • All clamps • All exhaust hoses • All fittings • Shock mounts: worn mounts can cause fittings, clamps, screws and bolts to work loose. What to look for includes: • Exhaust leaks • Cracks in hoses, pipes, components • Black streaking: this can mean loose parts are allowing exhaust to escape • Corrosion in hoses, pipes, components • Corroded pipe nipple on exhaust elbow: move the elbow to check for looseness • Change in exhaust sound • Change in exhaust smell in engine room or boat interior (carbon monoxide is odorless, but may be mixed with other exhaust gases) Check especially for pitting, pin holes, and cracks or loose rust at ends of pipe nipple and thread roots. Figures 1-1, 1-2 and 1-3 illustrate these areas. Redistribution or publication of this document, by any means, is strictly prohibited.
  2. 5-4 ENGINE LUBRICATION Engine Oil Level Wait at least 10 minutes to check the oil level if the engine has been running so that the oil can drain back into the crankcase. Keep the oil level just be- low the high level mark on the dipstick. CAUTION Running the engine when the oil level is low can lead to shutdown because of loss of oil pressure and to degradation of the oil because of high oil temperature. Overfilling can lead to foaming, which also degrades engine oil. Engine Oil Specifications Use API (American Petroleum Institute) Class CC/ CD engine oil. The oil should not contain more than
  3. 1.85 percent (by weight) of sulfated ash. Do not mix different classes or brands of oil since they can react chemically to form products harmful to the en- gine. Temperature affects oil viscosity. Multi-grade oils are designed for ease of starting in cold weather as well as good

Source: manual:960-0151B Onan MCGBA CA GA DA DB DA DB DC DD Operators Manual (6-2000) .pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.