RING-RETAINING 6Y1890 - Caterpillar

Work carefully around an engine that is running. Engine parts that are hot, or parts that are moving, can cause personal injury.
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.Dispose of all fluids according to local regulations and mandates.
Note: The following oil pressure measurements are taken between the oil filter and the engine lubrication system. Before you begin this procedure, ensure that the area around the oil pressure port is clean and dry. Be careful not to introduce any form of contamination into the lubrication system during this procedure.
Illustration 1 g02286393
Location of the pressure tap for the lubrication system (front side engine view)
(1) Metric plug (M14)
(2) 266-2177 Elbow
Table 1
Tools Needed for Oil Pressure Measurements at the 266-2177 Elbow
Part Number Part Name Quantity
1U-5470 Engine Pressure Group 1
5C-7617 Reducing Bushing 1
4M-5317 Reducing Bushing 1 Certain engines may also be equipped with a 302-5924 Cover at the front of the oil filter group. For these engines, the oil pressure measurement may be taken at the plug in the oil cover. The procedure for the oil pressure measurement at either location is the same.
Illustration 2 g02297394
Location of the pressure tap for the lubrication system (front side engine view)
(3) Metric plug (M12)
(4) 302-5924 Cover
Table 2
Tools Needed for Oil Pressure Measurements at the 302-5924 Cover
Part Number Part Name Quantity
1U-5470 Engine Pressure Group 1
8T-7860 Reducing Bushing 1
5P-5528 Reducing Bushing 1
Illustration 3 g00296486
1U-5470 Engine Pressure Group
The 1U-5470 Engine Pressure Group measures the engine oil pressure in the system. This engine tool group can read the engine oil pressure inside the oil manifold.Note: Refer to Special Instruction, SEHS8907, "Using the 1U-5470 Engine Pressure Group" for more information on using the 1U-5470 Engine Pressure Group.Note: The engine oil pressure can also be measured by using an electronic service tool. Refer to Troubleshooting for information on the use of the Caterpillar Electronic Technician (ET).
Remove the plug from the appropriate location for your engine. Install the appropriate bushings into the fitting for the pressure tap. These bushings will reduce the size of the tap to the correct size for the 1U-5470 Engine Pressure Group. Install the fitting for the pressure group into this port. Note: The fitting for the pressure tap is a metric size. Do not use a SAE or an NPTF fitting in this port.
Start the engine. Run the engine with SAE 15W40 oil. Refer to Operation and Maintenance Manual, "Engine Oil" for the recommendations of engine oil. Note: Allow the engine to reach operating temperature before you perform the oil pressure test.Note: The nominal engine oil temperature at rated