85681 Mercruiser BEARING (PAIR), CONNECTING ROD (.020 U.S.)

Table 1
Caterpillar® Lubricants Viscosity Grade
Cat Natural Gas Engine Oil Ultra 40Next Generation High Performance NGEO NGEO Ultra 40 SAE 40
Cat Natural Gas Engine Oil Advanced 40Premium Performance NGEO NGEO Advanced 40 SAE 40
Cat Natural Gas Engine Oil EL350(1)
Premium Performance NGEO, Limited regional availability NGEO EL350 SAE 40
Cat Natural Gas Engine OilHigh Quality NGEO, Limited regional availability NGEO 40 SAE 40
Hydraulic Oil Cat HYDO Advanced SAE 10W
SAE 20W
Cat Bio HYDO
Advanced (HEES) SAE 30
ISO 46 Multigrade
(1) Cat NGEO EL350 replaced Cat NGEO EL250
Table 2
Cat NGEO SAE 40 Viscosity Grade Properties
Characteristic ASTM Test Ultra 40 Advanced 40 Cat EL350 Cat NGEO
Flash Point 0 ° C (32 ° F) "D0092" 247 252 247 252
Pour Point 0 ° C (32 ° F) "D0097" −21 −30 −21 —15
Viscosity (cSt) at 100 °C (212 °F) "D0445" 13 13 13.5 13.2
Viscosity Index "D2270" 95 min 103 97 98
Weight (Percent) of Sulfated Ash "D0874" 0.54 0.5 0.54 0.52
Total Base Number "D2896" 6 6 6.2 5.6 Cat natural gas engine oils are the preferred oils for use in ALL Cat natural gas fueled engines that are covered by this Special Publication. Commercial alternative natural gas engine oils are, as a group, second choice oils.Cat natural gas engine oils are formulated with the correct amounts of additives and high quality basestock in order to provide superior performance in Cat natural gas engines.Caterpillar Inc. is frequently approached by engine owners and/or oil companies that wish to qualify an oil for use in gas engines. Caterpillar does not recommend the names of other commercial brands of lube oils. However, Caterpillar will evaluate the results of the Field Performance Evaluation for commercial brands of lube oils. The evaluation can verify that the oil meets the minimum lubrication requirements that are recommended by Caterpillar. Caterpillar has established the following guidelines for the Field Performance Evaluation of lube oil in gas engines. These guidelines are applicable to the engines that use the following fuels: dry natural gas, sour gas and bio-gas.Operating Conditions for the Field Performance Evaluation
Duration - The minimum number of operating hours for a G3300, G3400, G3500, and G3600 is 7000 hours.Load Factor - The load factor must be representative of the normal engine application at the site. High load factors are preferred.Lube Oil - The oil must meet the requirements for the oil properties that are described in this Special Publication, "Engine Oil" topic. The oil must also meet the requirement for the formulation for gaseous fuel and the requirement for 0.40 to 0.60% sulfated ash that are described in the “Commercial Oils” topic.Oil Analysis - Caterpillar recommends the S O S Services oil analysis program. Alternate oil analysis programs must measure oil condition and wear metals. Used oil samples must be obtained for analysis at 250 hour intervals. A baseline analysis of the new oil should also be obtained.Oil Change Interval - The oil change interval is determined by condemning limits that are established by Caterpillar. The limits are based on analysis of the used oil and the trend lines that are established. For typical oil change intervals, see this Special Publication, "Oil Change Interval" topic.Fuel Analysis - An analysis of the fuel must be provided by an independent laboratory at the beginning of the Field Performance Evaluation. The results from the gas analysis must meet the guidelines of the engine models. For the guidelines, see this Special Publication, "Fuel Specifications" section.Criteria for the Evaluation
Oil Consumption - The oil consumption must not exceed two times the initial oil consumption during the Field Performance Evaluation. The initial oil consumption is established during the first 1000 hours of operation with the oil that is being evaluated.Valve Recession - The valves and the valve seats wear over time. This causes the valves to recede into the cylinder head. This condition is called “valve recession”. Measure the valve recession at the engine commissioning. This measurement is the baseline. The baseline is a reference for subsequent measurements. Measure the valve recession according to the engine Operation and Maintenance Manual, "Maintenance Interval Schedule". The valve recession must not exceed the limits that are established for the engine by Caterpillar. Refer to the engine Operation and Maintenance Manual, "Valve Stem Projection - Measure/Record" topic for the limits for the valve recession.Parts Requirements - If a new engine is used for the Field Performance Evaluation, all of the engine cylinders must be inspected with a borescope during the final inspection. The cylinder that shows the worst deposits or wear and the cylinder that shows average deposits or wear must be used for the visual inspection. If a used engine is used to evaluate the oil, two new sets of these components must be installed before the Field Performance Evaluation: pistons, piston rings, cylinder liners and cylinder heads. These new components will be examined during the final inspection.Final Inspection - At the end of the Field Performance Evaluation, these components from two cylinders must be removed and inspected:
Pistons
Piston rings
Cylinder liners
Cylinder heads
Connecting rod bearingsNone of the following conditions are acceptable:
Sticking of the piston rings
Scuffing of the piston rings and/or cylinder liners
Excessive wear of the piston rings
Polishing of the cylinder liner bore must be confined to the area that is affected by the uppermost position of the top piston ring.
The entire circumferences of the inlet valves and the exhaust valves must seal.
Guttering of the valves is not acceptable.Close up photographs that show the wear and deposits must be taken in order to document the appearance of these components: pistons, piston rings, cylinder liners, crankcase, top deck of the cylinder head, bottom deck of the cylinder head, inlet valves and exhaust valves (bottom, face, and stem). In addition, two exhaust valve guides must be removed from two cylinders and sectioned lengthwise. Photographs that show the entire component must also be provided.Summary - This proced