PIN AS-SPRING 8T4744 - Caterpillar

Introduction
The 1U5470 Engine Pressure Group is the replacement for the 6V3150 and 6V9450 Engine Pressure Groups. It is also a replacement for the 4S6553 Engine Evaluation Test Group.The piece parts in the 6V3150 and 6V9450 Engine Pressure Groups are still serviced. But the parts in the 4S6553 Engine Evaluation Test Group are no longer serviced.Either the 6V3150 or the 6V9450 Engine Pressure Group can be updated to the status of the 1U5470 Engine Pressure Group. Refer to the topic entitled Procedure for the Update of a 6V3150 or a 6V9450 Engine Pressure Group in this publication.The 1U5470 Engine Pressure Group can be used to check the performance of both diesel and natural gas engines, and to make operating adjustments to natural gas engines. Refer to the Service Manual of the engine being serviced, or, the Fuel Setting and Related Information Microfiche Library, Form SBFY1108, for the operating specifications that are needed.The gauges in the 1U5470 Engine Pressure Group are gauge pressure instruments that indicate pressure relative to ambient atmospheric pressure. This type of instrument will read ZERO when the pressure port is open to the atmosphere.Engine boost or manifold pressure is the difference between atmospheric pressure and the pressure in the engine intake manifold. The 1U5469 Pressure Gauge can read boost directly in kPa and inches of Hg.The 8T0839 Differential Pressure Gauge reads directly in kPa and inches of H2O. All other gauges in the group read directly in kPa and psi.The chart in the lid of the case can be used to convert kPa or psi to inHg (inches of mercury) as shown in the Fuel Setting and Related Information Microfiche. No allowance for atmospheric pressure is needed in the conversion. The metric portion of the new pressure gauges is shaded in yellow.Components of the 1U5470 Engine Pressure Group
1. 8T0841 Case. 2. SEES5677 Conversion Chart. 3. 8T0846 Pressure Gauge. 4. 8T0838 Bulkhead Fitting (eight)1. 5. 1U5469 Pressure Gauge (or optional 8T0840 Pressure Gauge). 6. 8T0839 Differential Pressure Gauge. 7. 8T0848 Pressure Gauge (three). 8. 8T3153 Foam Block2. 9. 6V6115 Packing Set Base. 10. 8T0835 Union1 (two). 11. 8T0452 Water Manometer (optional) and 1U5554 Panel Assembly (optional). 12. 8T0837 Straight Connector (six)1. 13. 8T0836 Elbow Fitting (six)1. 14. 8T0821 Tubing3, 16 m (52.5 ft). 15. 6V6045 Accessories Case and NEEG2061 Accessories Label.1/81The 8T0835 Union, 8T0836 Elbow Fitting, 8T0837 Straight Connector and 8T0838 Bulkhead Fitting are reusable " tube fittings for applications in the pressure range of vacuum to 1720 kPa (250 psi) and in temperatures from -12°C to 200°C (10°F to 400°F).2The optional 8T3117 Foam Block can be positioned in the lid of the 8T0841 Case to hold the optional 8T0452 Water Manometer in the case with the 1U5470 Engine Pressure Group.3The 8T0821 Tubing is a coil of 16 m (52.5 ft) of clear nylon tubing that permits the user to see fluid in it before and during use.The 6V6132 Cable Tie can be used to fasten tubing to the engine so it does not come in