Focus On Training Section: Unit 5

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Kory Shaw
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DB Fuel Pump First Modern rotary fuel injection pump 1952 Low cost, light duty pump DC

1 Model Type: Mechanical Pumps Page 1 1. Title Page Evolution of the Modern Stanadyne Rotary Pump 2. DB Fuel Pump First Modern rotary fuel injection pump 1952 Low cost, light duty pump DC pump introduced in 1963 Similar to the DB pump except it has 4 pumping plungers and a splined drive 3. DM Model Introduced in 1970 Heavier duty pump model (replaced DC model pump) Describe Main Features Significant design improvements Integral, angled discharge fittings Improved transfer pump design Strengthened housing and drive arrangement

Automotive DB2 Pumps First automotive DB2 pump was released in 1978 on the 5.

2 Model Type: Mechanical Pumps Page 2 4. DB2 Model Introduced in 1977 Low cost, high speed, light to medium duty 5. Automotive DB2 Pumps First automotive DB2 pump was released in 1978 on the 5.7L Oldsmobile The GM 6.2L was released in 1982 The Navistar 6.9 / 7.3 L was released in DB4 Introduced in 1989 Replaced virtually all model DM pump applications Low cost, high speed, medium duty applications 4 plungers.250 diameter metering valve 50mm pilot diameter makes it interchangeable with DB2 models

bearing 8. DB2 Nameplate Understand the name plate code.

Accessory codes can be found in S.B. 63r13 9.

3 Model Type: Mechanical Pumps Page 3 7. DB4 Drive Arrangement Heavy duty drive shaft supported by a needle bearing 8. DB2 Nameplate Understand the name plate code. Later models do not display accessory codes. Accessory codes can be found in S.B. 63r13 9. Pump Name Plates Understand the name plate code. Date code Model number breakdown Rated RPM Pump serial number Customer part number Blank name plates are available for service

Only these components rotate Drive shaft Governor cage and weights Rotor Transfer pump blades 11.

Hydraulic head assy 5. Transfer pump blades 6. Transfer pump regulating piston 7. Rotor 8. Cam ring 9.

4 Model Type: Mechanical Pumps Page Main Rotating Parts Typical injection pump contains more than 100 parts. Only these components rotate Drive shaft Governor cage and weights Rotor Transfer pump blades 11. Model DB2 Cutaway Be able to identify principal pump components 1. Drive shaft 2. Housing 3. Metering valve 4. Hydraulic head assy 5. Transfer pump blades 6. Transfer pump regulating piston 7. Rotor 8. Cam ring 9. Advance piston 10. Pumping plungers 11. Governor hub and weight retainer 12. Model DB2 Be able to describe basic fuel flow and pressure ranges Inlet 0-5 psi Transfer pump psi Housing 5-12 psi Injection psi Lube oil splash

5 Model Type: Mechanical Pumps Page Title Page The use of these features enables Stanadyne to extend the life of the DB2/4 product line well into the 21st century 14. Why? Target Series Pumps As of January 1, 1997 new stricter emission standards plus anti-tampering law were enacted for off-highway diesel engine. Note that tier 3 became effective in EPA Off Road Diesel Emissions Standards Tier 2 and 3 pump category that affects Stanadyne Range of pump models

Target Pump Features Servo Speed Light Load Advance Solenoid Actuated Cold Start Advance Low Speed

6 Model Type: Mechanical Pumps Page Off Highway Emission Standards Tier 1, 2 & 3 50 to 100 HP Diesel Emissions 17. Target Pump Features Servo Speed Light Load Advance Solenoid Actuated Cold Start Advance Low Speed Fuel Limiter Pressure Compensating Regulator Locked Drive Shaft Timing Vented Metering Valve Bolted Governor Hub 18. Pressure Compensating Transfer Pump This compensation feature is an important development since variations in TP pressure affects features such as the advance and low speed fuel limiter, both of which control emissions. Will be covered in detail in section M-5

reducing exhaust smoke levels when the engine is lugged down below peak torque speed. Will be covered in detail in Section M-6 20.

80 s (popular on Onan A series). Advance has been redesigned to provide more precise control and a greater range of light load advance.

7 Model Type: Mechanical Pumps Page Low Speed Fuel Limiter The low speed fuel limiter provides a means of reducing the pump s wide open throttle fuel below peak torque speed, thereby reducing exhaust smoke levels when the engine is lugged down below peak torque speed. Will be covered in detail in Section M Servo Speed Light Load Advance with Solenoid Actuated Cold Start Advance Covered in detail in Section M-9 Original SS/LLA released to production in early 80 s (popular on Onan A series). Advance has been redesigned to provide more precise control and a greater range of light load advance. The solenoid actuated cold start advance provides additional advance during cold engine operation to reduce white smoke and emissions 21. Locked Drive Shaft Timing Perkins Improved Installation accuracy as well as being a deterrent to unauthorized timing adjustments No mounting flange kidney slots Non-keyed hub

8 Model Type: Mechanical Pumps Page Tamper Resistance Note tamper proof 23. Tamper Resistant Fasteners and Bits 5 lobes and a pin 15, 25 & 40 IPR sizes Only for authorized distributors and dealers 24. Tamper Resistant Fastener Locations All locations that permit access to fuel delivery adjustments

9 Model Type: Mechanical Pumps Page Tamper Resistant Torque Screw 15 IPR Torx Bit P/N Torque Screw Locknut Wrench P/N Tamper Resistant Feature for High & Low Idle Screws Used on Perkins applications. Idle Screw Locknut Wrench P/N Mechanical Pump Future Know the advantages of a mechanical pump

Model Type: Mechanical Pumps Page 10 28.

T2 Mechanical Pump 37 74 kw engine range 650 700 bar Some or all of the Target Features Key design changes

10 Model Type: Mechanical Pumps Page T2 Mechanical Pump 2nd Generation Target Pump to meet Tier II emission Standards for Off-highway equipment 29. T2 Mechanical Pump kw engine range bar Some or all of the Target Features Key design changes Dampened Servo Valve, Balanced Metering Valve, Vented Rotor 30. T2 Features SSLLA Will be covered in detail in Section M6. A redesign of the servo valve that results in a steadier advance

Model Type: Mechanical Pumps Page 11 31.

11 Model Type: Mechanical Pumps Page T2 Features Balanced Metering Valve Balance hole to reduce side loading Allows for increased consistency of metered fuel pressure 32. T2 Features Vented Rotor Vents pressure fluctuations of metered fuel between charging events improving distribution differences

Stanadyne Service Tools

Stanadyne Service Tools 13301 Pressure Regulator Sleeve Extractor All Pump Types 13336 5/32" Hex Screwdriver All Pump Types 13337 Small, Squeeze-to-Open Snap Ring Pliers All Pump Types 13366 Advance Test Window Assembly 13367