Usage:
The gauges in the 6V3150 Engine Pressure Group are "gauge" pressure instruments that indicate pressure relative to ambient atmospheric pressure. This type of gauge will read "zero" when the pressure port is open to the atmosphere. The 4S6997 Gauge in the former 4S6553 Engine Test Kit was an "absolute" pressure gauge that indicated pressure relative to absolute zero pressure. A gauge of this type reads atmospheric pressure, about 760 mm (30 inches) of mercury or 101 kPa (14.7 psi), 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 new 6V3150 Engine Pressure Group can read boost directly in kPa (use the chart in the lid to convert kPa to inches of mercury as shown in the Rack Setting Chart) without subtracting atmospheric pressure as was previously necessary when using the 4S6553 Engine Test Kit.
List Of Components
1. 6V4036 Case
2. 6V6055 Differential Pressure Gauge (formerly 5P6579)
3. 6V6164 Pressure Gauge (formerly 6V4016)
4. 6V6165 Pressure Gauge (formerly 6V4017)
5. 6V6166 Pressure Gauge (formerly 6V4018)
6. 3K6677 Fitting (eight)
7. 5P5630 Tube, 16 mm (52.5 ft.)
8. 5P2948 Connector (ten)
9. 3K6675 Fitting (six)
10. 4K9822 Nut (ten)
11. 4K9821 Sleeve (ten)
12. 6V6132 Cable Tie (five) (not shown)
13. 6V6045 Case (one) (formerly 6V4075 Containers)
14. 6V6115 Packing Set
15. SEHS7860-01 Conversion Chart
16. SEHS7815 Title Decal (on outside of lid)
17. 5P2949 Connector (not shown)
18. 6V3342 Pipe Elbow (not shown)
NOTE: 6V6045 and 6V6115 Replace the two former 6V4075 containers.
Specifications
Operating Temperature Range: ... -1 to +60°C (30 to 140°F) for differential pressure gauges. ... -18 to +71°C (0 to 160°F) for all other gauges.
Gauge Accuracy: ± 2% of full scale for differential pressure gauges.
SAE Grade "A" (2% - 1% - 2%) for all other gauges.
Overrange Pressures: 100 kPa (15 psi) for differential pressure gauges.
Pressures above full scale will destroy accuracy of all other gauges.
Operating Position: Differential Pressure Gauges - position has no effect on accuracy provided gauge has been mechanically adjusted to zero in the test position.
All other gauges - position has no effect on accuracy.
Pressure Medium: Differential pressure gauges - clean air and gases only (no fluids)
All other gauges - air and liquids (oil, water, antifreeze, fuel etc.).
Weight: 5 kg (11 lbs) without 6V3121 Multitach Group.
Size: 394mm x 311mm x 140mm (15 1/2" x 12 1/4" x 5 1/2")
Description Of Gauges
Pressure Gauges
6V6166 Pressure Gauge (1): This is a common pressure gauge that can be used to measure pressures of 0 to 400 kPa (0 to 60 psi) with an accuracy of ± 7 kPa (± 1 psi). The gauge is filled with glycerine to provide lubrication and dampening of pressure pulses. Typical uses for this gauge are the measurement of fuel pressure, intake manifold pressure on turbocharged engines, and cooling system pressure.
6V6164 Pressure Gauge (2): This is also a common pressure gauge. It can be used to measure pressures of 0 to 1000 kPa (0 to 150 psi) with an accuracy of ± 20 kPa (± 3 psi). This gauge is also filled with glycerin to provide lubrication and pulse dampening. Typical uses for this gauge are the measurement of oil pressure and air compressor cut-in and cut-out pressure.
Compound Pressure Gauges
The two 6V6165 Pressure Gauges (3) are compound pressure gauges that can be used to measure pressures of 0 to 400 kPa (0 to 60 psi), and to measure a vacuum in the range of 0 to -100 kPa (0 to -15 psi). The accuracy of each gauge is ± 7 kPa (± 1 psi) for positive pressure and ± 1.4 kPa (± .2 psi) for vacuum measurements. These gauges are filled with glycerin to provide lubrication and to dampen pressure pulses. Typical uses for these gauges are the measurement of intake manifold pressure on turbocharged engines, manifold vacuum on natural gas and gasoline engines, and the power balancing of twin engines in a natural gas or diesel application.
Differential Pressure Gauges
The two 6V6055 Differential Pressure Gauges (4) read the difference between two pressures. They have a range of 0 to 12 kPa (0 to 50 inches of water), and are accurate within ± .25 kPa (± 1.0 inch of water). The gauges have two inlet ports. One port is for the higher pressure and is identified by the word, PRESSURE. The other port is for the lower pressure and is identified by the word, VACUUM. The gauge will indicate the difference between the two pressures.
If one port is left open to the atmosphere, the gauge can be used to measure the difference between atmospheric pressure and the test pressure. If the PRESSURE port is connected and the VACUUM port left open, the gauge can be used to read a positive pressure (such as the exhaust back pressure caused by a muffler). If the VACUUM port is connected and the PRESSURE port is left open to the atmosphere, a vacuum can be read (such as the inlet restriction through an air cleaner). If both ports are connected to positive pressures (such as the gas delivery pressure and the inlet manifold pressure of a turbocharged natural gas engine), the gauge will read the difference between the two pressures. The use of both gauges at the same time permits simultaneous readings of the inlet restriction and the exhaust back pressure when road testing vehicle engines.
Each gauge has a zero adjusting screw. When necessary, adjust the screw so the gauge reads zero with no connections to the gauge fittings.
Repair Of The 6V3150 Engine Pressure Group
If it becomes necessary to repair the engine pressure group, do not send the instrument or the gauges to Caterpillar Tractor Co. as this will only cause delay. In the U.S.A. and Canada, the gauges can be returned for repair to the addresses shown below. Outside the U.S.A. and Canada, it is more economical to replace the gauges than to return the gauges for repair.
Return the 6V6055 Differential Pressure Gauges to:
Dwyer Instruments Inc.Highway 212 at 12
Michigan City, IN 46360
Phone: (219) 872-9141
Return the 6V6164, 6V6165 and 6V6166 Pressure Gauges to:
Carrier - Oehler Co.16965 Vincennes Avenue
P.O. Box 40
South Holland, IL 60473
Phone (312) 339-8200
Articles returned for warranty consideration or repair should be packaged in a manner to prevent damage in transit, and in accordance with the best commercial practice for fragile items. Instruments should not be shipped parcel post.
IMPORTANT: A common cause for failure of the gauges is overpressure (pressure beyond the maximum on the gauge scale). Overpressure can destroy the gauge in three progressive steps: 1) Loss of accuracy due to deformation of the Bourdon Tube, 2) failure of the mechanism, 3) rupture of the gauge. Failures caused by overpressure are not considered to be warranty, but abuse by the operator. Repairs to such gauges are on a time and material basis. Examination of the mechanism by the manufacturer will indicate a past overpressure condition.
Use Of Engine Pressure Group With Other Instruments
The 6V3150 Engine Pressure Group should be used with the 6V3121 Multitach Group and the 6V4060 Set Point Indicator (1) when checking engine performance. Space has been provided inside the carrying case of the 6V3150 Group for storage of the set point indicator and the necessary components of the 6V3121 Multitach Group [such as the 6V2100 Multitach (2), 5P7366 Power Cable (3), 5P7362 Tach Cable (4), and 5P7360 Tach Generator (5), and 1P7446 Rack Contact Cable (6)]. For information on the use of the multitach group, see Special Instruction Form SEHS7807, "USING THE 6V2100 AND 6V3121 MULTITACH GROUP", and Form SEHS7931 "USING THE 6V4060 ENGINE SET POINT INDICATOR GROUP".
Calibration Of Gauges
(A) 6V6164, 6V6165 And 6V6166 Pressure Gauges
The 5P8558 Calibration Group and 2D2825 Hydraulic Pump should be used to calibrate these gauges every six months as shown in the Service Quality Guide, Form No. SEBF3500 (Bulletin No. TC-1). Use five test points as reference to check the calibration of each gauge. Calibration tolerances are shown below.
(B) 6V6055 Differential Pressure Gauges
Use a water manometer as shown below and the following procedure to check the calibration of the differential pressure gauges.
1. With no pressure applied and the gauge disconnected, put water in the tubing of the manometer to the 500 mm (20 inch) level.
2. Use the zero adjusting screw if necessary to make the gauge read zero with no connections.
3. Connect the PRESSURE port of 6V6055 Gauge (1) to the tubing of the manometer as shown.
4. If the manometer measures in inches, apply a light pressure (approximately 7 kPa) to the manometer tubing to cause the water column to read 35 inches and 5 inches (30 inches of water difference in pressure). The reading on the gauge should be 7.5 kPa ± .25 kPa.
5. If the manometer measures in millimeters, apply a light pressure (approximately 7 kPa) to the manometer tubing to cause the water column to read 900 mm and 135 mm (765 mm of water difference in pressure). The reading on the gauge should be 7.5 kPa ± .25 kPa.
6. Any gauges that are not within specification should be repaired or replaced.