WASHER 7N2994 - Caterpillar

Engine:
3116 (S/N: 4KG1-UP; 1SK1-UP)
3126 (S/N: 1ZJ1-UP; 6MK1-UP; 8NM1-UP; 6SR1-UP; 4EZ1-UP)
Updated information has now been entered into Operation and Maintenance Manual, SEBU6251, "Caterpillar Commercial Diesel Engine Fluids Recommendations", "Engine Oil (3116 and 3126 Marine Engines)".Caterpillar only recommends oil viscosities of single weights for engines with mechanical unit injectors. This includes all 3116 and 3126 Marine Engines that begin with the following serial number prefixes: (S/N: 6SR), (S/N: 8NM), (S/N: 4KG), (S/N: 1SK), (S/N: 1ZJ), (S/N: 6MK) and (S/N: 4EZ) The updated article is given below.Recommendations
Caterpillar does not recommend the use of multigrade oils in the 3116 and 3126 Marine Diesel Engines that use mechanical unit injection.Multigrade oils use high molecular weight polymers as viscosity index improvers.When the crankcase blowby flows through the turbocharger and the aftercooler, the viscosity index improvers in the oil vapor can adhere to the turbocharger compressor and aftercooler core.The fouling of the turbocharger and aftercooler can cause reduced air flow, loss of power, and increased black smoke. The emission of black smoke results in buildup of soot on the transom of the boat.Note: Caterpillar recommends the use of single grade oils with the API CF-4 classification for all 3116 and 3126 Marine Engines unless crankcase blowby has been routed completely away from the air cleaner inlet.Cat SAEO (Special Application Engine Oil)
Note: Cat SAEO is for use in Caterpillar 3116 and 3126 Marine Diesel Engines with mechanical unit injection. This includes all 3116 and 3126 Marine Diesel Engines that begin with the following serial number prefixes: (S/N: 6SR), (S/N: 8NM), (S/N: 4KG), (S/N: 1SK), (S/N: 1ZJ), (S/N: 6MK) and (S/N: 4EZ).The factory fill in 3116 and 3126 Marine Engines is Cat SAEO. The oil that is used for the factory fill has the following properties:
API CF-4 classification
Viscosity grade of SAE 30For maximum performance in 3116 and 3126 Marine Diesel Engines with mechanical unit injection, Caterpillar recommends the following engine oil:
Cat SAEO (SAE 30)
Cat SAEO (SAE 40)Commercial Oils (3116 and 3126 Marine Engines)
When Cat SAEO is not used, use the following commercial oils:
Single grade oil with a viscosity of SAE 30 or SAE 40 with an API CF-4 classification is preferred.
Single grade oil with a viscosity of SAE 30 or SAE 40 with a CF-4 or CG-4 additive package that does NOT contain viscosity improvers is an acceptable oil.For an acceptable commercial single grade oil, contact your oil supplier or Caterpillar Customer Service:1-800-447-4986The following explanation of the API CF-4 classification can be used to make the proper choice when a commercial single grade oil with API CF-4 classification is chosen.API CF-4 - API CF-4 oils provide more stable oil control and reduced piston deposits in comparison to API CF and the obsolete CE and CD classifications of oil. API CF-4 oils provide improved soot dispersancy in comparison to API CF and obsolete CD oils. The API CF-4 classification was developed with a 0.40 percent sulfur diesel fuel. This represents the type of diesel fuels that are commonly available worldwide.Some commercial oils that meet the API CF-4