Cat 3406a fuel adjustment. Incorrect settings cause poor combustion and power loss.
Cat 3406a fuel adjustment 01 inch). Incorrect settings cause poor combustion and power loss. Turning it clockwise typically leans the mixture; counterclockwise enriches it. PEEC controls fuel rate and timing electronically instead of using flyweights and linkages. Put the fuel ratio control in position on the governor. Mechanic's Assistant: Are you handling this repair yourself? What steps have Caterpillar Injector Height Tool Alternative to 9U-7227 Adjustment Gauge Assembly for CAT Engines 3406E C15 and C16 Diesel Truck Tools. Check the fuel injection pump’s diaphragm for proper tension and sealing. It's the same service manual used by dealers that guaranteed to be fully functional and intact without any missing page. Sep 17, 2014 · Jump to page : 1 Now viewing page 1 [50 messages per page] A detailed description of the “best way in my opinion” how to adjust the torque and horsepower screws on a Caterpillar 3406B 3406 Diesel Engine S/n 70V1 & Up THIS IS A MANUAL PRODUCED BY JENSALES INC. Oct 28, 2009 · The only thing to help it is to remove the metal line from the air/fuel, and remove the two bolts, and adjust the screw in until it's flush with the nut. To adjust fuel delivery, locate the fuel mixture screw on the carburetor or fuel injection system. I think at some time someone who didn't know what they were doing has worked their magic in there. 0 ± 0. The only thing is that it is idling a little Jan 19, 2010 · The screws are set by measurement. My mechanic showed me a little black plastic box that screws into the fuel pump. 5 degrees, but I don't have a meter. instructions how to adjust fuel injection pump timmimg . c. It builds fairly slow to 12 psi. The injection pump Jan 18, 2019 · This Caterpillar 3406 & 3406B Engines service & repair manual (including maintenance, overhaul, disassembling & assembling, adjustment, tune-up, operation, inspecting, diagnostic & troubleshooting…) is divided into different sections. Feb 21, 2010 · how many rpms before max is the governor starting to cut down fuel? We were dynoing a KW with 3406 B that free revs to about 2700 and under load to 2400 but seems like it doesn't make full boost above 1800 rpm or something like that. The screw is then tightened with a locknut to secure the adjustment. The jakes are coming on at idle. The adjustment screw is turned to obtain a measurement of 78. Loosen four bolts. Jun 27, 2025 · A guide to the CAT 3406E. This document provides instructions for removing and installing fuel injection lines and an automatic timing advance on a 3406 engine for a generator set. Regular maintenance of injectors and To adjust low idle speed on a 3406C Cat engine with a Jake brake, first warm up the engine. Learn specs, maintenance tips, common issues, and why this mechanical legend still dominates in 2025. Factory service information for the Cat 3406E engines with serial number prefixes 2WS or 1MM. For proper Cat 3406B Jake brake wiring, ensure the system is not wired 'hot' (always powered). Show me how to setting up injector of CATERPILLAR model 3406E/C15 into cylinder head also adjusting valve Mar 4, 2020 · Ring (20) holds the washers on the riser (follower). The ECM controlled major functions of the engine such as engine timing and fuel rate by using actuators. This injector height gauge tool is used in order to obtain a dimension of 78. 1. If an injector is changed or removed it is a good idea to set the injector height on Cat engines. I know Bosch B pumps usually start to cut fuel about 500 Fuel Adjustment Issues in Unknown Vehicle Model Users often face difficulty adjusting fuel mixture and inconsistent engine performance during tuning. 5:1 ratio between the screws. 030" exhaust. The truck started right up with no smoke. There’s a Cat service tool group for setting travel and tolerances in the back of the governor. It is responsible for delivering precise amounts of fuel to the engine cylinders at the right time, ensuring optimal performance and efficiency. Before an adjustment is made, record the difference between the correct specification and the dynamic fuel ratio control reading recorded in Step 14 of FUEL RATIO CONTROL AND GOVERNOR CHECK. Intake and exhaust valve clearances should be measured cold; typical clearances are 0. It’s a mechanical diesel engine that thrives where high-torque, low-RPM performance is required. A worn or misaligned governor can cause excessive revving. Remove cover. Adjusting Fuel on Caterpillar 3406A Engine: Key Tips 3406A engines often face fuel delivery inconsistencies and air-fuel ratio imbalances causing performance issues. Tune Up Orwell! How to Check and Re-timing Injection Pump for 3406 CAT engine. . It provides instructions and specifications for servicing the engine's systems, testing and adjusting components, and troubleshooting issues. PEEC uses several sensors as inputs to control two basic functions: rack and timing For the Cat 3406 engine, injector timing is critical for optimal performance. The Heavy Equipment Mechanic I’m going to connect you with is familiar with all the tricks and shortcuts. Access Original Service and Repair Manuals – A Comprehensive Shop Service Manual encompassing operational insights, detailed specifications, wiring schematics, step-by-step disassembly and assembly procedures, testing and adjustment guidelines, along with troubleshooting steps specifically tailored for Caterpillar machinery. Regularly inspect injector nozzles for clogging and adjust Jun 21, 2010 · 3406 PEEC Introduction The 3406 PEEC evolved from the legendary 3406 mechanically governed engine with the addition of an electronic control module (ECM). The 3406b Cat injection pump is an essential component of the engine’s fuel system. Whether you’re involved in To reduce fuel on a Cat 3406B, turn the fuel adjustment screws clockwise carefully. I WAS IF SOMEONE KNEW THE NUMBERS TO SOME BIGGER INJECTORS FROM CAT AND IF ANY ONE HAS 550 OR 600H. FUNCTION -- Designed to Easily & Accurately adjust the Injector Height of the engine. Make sure the flange on the end of the fuel ratio control is behind the groove (slot) in the lever. and finally to the govenor springs/shims and the servo adjustment screw. Nov 18, 2012 · Jump to page : 1 Now viewing page 1 [50 messages per page] How to change/time plungers in 3406b CAT fuel injection pump Caterpillar 3406B Valve and Jake Adjustment Made Easy. It was smoking a lot of white smoke and missing and way down on power. 14 manuals are included in the downloadable set which covers specifications, operation and maintenance, overhaul, testing and adjusting, troubleshooting, wiring diagram, and much more for the engine and supporting systems. 5 turns on the fuel screw, 1 turn on the torque in the same direction. Application: Caterpillar 3406E, C-15 and C-16. Always make small adjustments and test drive between changes. If linkage adjustments don’t raise idle, the fuel injection pump’s internal low idle screw may need fine-tuning. The steps include removing nuts and bolts to detach the lines and timing advance, cleaning surfaces, installing new gaskets, and tightening to the specified torques. Install shaft (23) in the flyweight assembly. Adjust the throttle stop screw to limit maximum RPM. Jan 18, 2019 · Complete digital official shop manual contains service, maintenance, and troubleshooting information for the Caterpillar 3406, 3406B, 3406C, 3406E Engine. Hold the adjusting screw in this position and tighten locknut (3) to a torque of 100 ± 10 N·m (74 ± 7 lb ft). Aug 2, 2017 · Jump to page : 1 Now viewing page 1 [50 messages per page] May 17, 2014 · The adjustment was pretty much as you described , screw barely sticking out of locknut. Once they’re at the factory settings you can do whatever you want with them, as long as you maintain the 1. b. E MODEL THATS KNOWS THE CAT PART NUMBER FOR THE TURBO? ANY HELP WOULD To raise the RPM governor on a 1989 Cat 3406B, adjust the mechanical governor spring tension or replace it with a stiffer spring. This Caterpillar 3406 & 3406B Engines service repair manual (including maintenance, overhaul, disassembling & assembling, adjustment, tune-up, operation Feb 11, 2010 · I have a 1986 3406B in a 359 Pete. From the differences in the early advances to the late ones to the fuel screws and the function and importance of torque rise and how a cat runs different than say a cummings because of it. Jan 11, 2021 · The dimension is measured from the top of the unit injector to the machined ledge of the fuel injector body. P. Oddly, I cleaned the fuel tank vent at one time during this ordeal and it increased boost to almost 15 psi but lost that somewhere between changing out fuel transfer pumps and hoses. Install flyweights (22) and pin (21). ) with tool (C). The dimension is measured from the top of the unit injector to the machined ledge of the Nov 23, 2005 · I AM NEW TO THE SITE BUT I SEE A COUPLE GUYS KNOW ABOUT CAT 3406'S I HAVE A 3406B AND I'M TRYING GET IT UP TO 600-650 H. Oct 21, 2006 · I backed the screws out 6 turns after having the pump rebuilt and calibrated 50%,deleted the air fuel ratio,retimed the fuel,and switzzer turbo. Engineers, mechanics, and equipment owners favor the 3406B for its simple layout and ease of Important Safety Information Most accidents that involve product operation, maintenance and repair are caused by failure to observe basic safety rules or precautions. The ECM also monitored the engine through electronic sensors including speed, rack and timing, boost, oil, and coolant temperature 14. Home Disassembly and Assembly #sebr05440127 Automatic Timing Advance 7FB1-Up, 4MG1-4MG3599 ` 3406B DIESEL TRUCK ENGINE [SEBR0544] 3406B DIESEL TRUCK ENGINE Fuel Ratio Control For Use With Later Engines 3406B DIESEL TRUCK ENGINE Fuel Injection Pump Housing And Governor FUEL SYSTEM GOVERNOR GP Oct 23, 2009 · adjusting fuel to air mixture on 3406c Discussion in ' Trucks [ Eighteen Wheelers ] ' started by jd2210, Jun 22, 2011. Key topics covered include the fuel injection system, cooling system, electrical system, lubrication system, and locating top center compression Nov 19, 2005 · Do the steps that follow to adjust the fuel injection pump timing. 17. WITHOUT THE AUTHORIZATION OF CATERPILLAR OR IT’S SUCCESSORS. A table of contents is placed at the beginning of each section. Customer: Okay. Calibrate the electronic unit injector. Mechanic's Assistant: Sometimes, issues that seem complicated can actually be quite simple to resolve. how to remove fuelpump how to remove and install disel pupm. I need to advance the timing to 17. CATERPILLAR AND IT’S SUCCESSORS ARE NOT RESPONSIBLE FOR THE QUALITY OR ACCURACY OF THIS MANUAL. Cylinders 1, 2 and Learn more Adjusting the overhead on a 3406B 7FB Caterpillar. Cat 3406B air fuel ratio diaphragm adjustment?,,,A rough engine between 1000-1500 rpm after a pump rebuild often indicates incorrect air-fuel ratio diaphragm adjustment. Apr 16, 2025 · The Caterpillar 3406B engine is celebrated globally for its power, reliability, and versatility across rugged environments. Regularly clean and maintain the fuel injection pump and governor components to ensure smooth operation Customer: I'm looking to adjust the fuel screws back to stock on a 3406 B model Caterpillar. Begin by checking the injector pump timing using a dial indicator at the fuel rack. Tighten two bolts 180° apart, evenly to a torque of 3 N*m (27 lb in). 2 mm (3. Each section covers a specific component or system with detailed illustrations. Sep 21, 2009 · Search this forum Printer friendly version E-mail a link to this thread Adjusting Timing on a Caterpillar 3406B Engine Without a Meter for Better Performance Mechanic's Assistant chat Customer: I have a 3406B with the serial number 3ZJ03185. This person should also have Caterpillar Service and Repair Manual. 2 mm from the injector to the fuel body ledge using a height gauge. Disassembly and assembly of the automatic timing advance and fuel transfer 3406 Diesel Truck Engine S/n 92U1 & up THIS IS A MANUAL PRODUCED BY JENSALES INC. The motor puts 726 hp and 2092 lbs torque to the ground and will pull a 7 percent 4 mile grade at 80,000lbs at 1100 degrees in overdrive. A person must be alert to potential hazards, including human factors that can affect safety. Locate the idle speed adjustment screw on the fuel injection pump or governor linkage. An accident can often be avoided by recognizing potentially hazardous situations before an accident occurs. 015" intake and 0. Install the bolts that hold the fuel ratio control in position. Diagnostic and repair procedures are covered in great detail to repair, maintain, rebuild, refurbish or restore your engine like a professional mechanic in local service/repair workshop. 07 ± 0. Install the pin in shaft (23). 16. Connect Cat ET to the service tool connector. Symptoms of improper adjustment include rough idling, stalling, or poor acceleration. 18. Inspect linkage and governor settings to ensure correct fuel delivery under load. a. With timing pin installed and the timing bolt removed, turn the flywheel clockwise (opposite the direction of engine rotation) a minimum of 45°. Nov 19, 2005 · Do the steps that follow to adjust the fuel injection pump timing. Nov 9, 2010 · We've got a 92 Ford 9000 tandem dump truck with a 3406b cat in it. The electronics also replace the mechanical fuel-air ratio control, torque control group, and various adjustment screws. The included publications are written specifically for the serial number […] To reduce high RPM on a 3406B Cat engine, first inspect the governor linkage and throttle stop adjustment. The Programmable Electronic Engine Control (PEEC) is a fuel control system used on Caterpillar 3406B PEEC engines which have engine serial numbers beginning with 8TC, 5YG and 2EK prefixes. To adjust fuel delivery, locate the fuel mixture screw on the carburetor or fuel injection system. Sep 17, 2014 · Jump to page : 1 Now viewing page 1 [50 messages per page] Aug 2, 2017 · Jump to page : 1 Now viewing page 1 [50 messages per page] May 17, 2014 · The adjustment was pretty much as you described , screw barely sticking out of locknut. Caterpillar Air Fuel Ratio Control Rebuild, replacing the hydraulic spool with the correct one and then testing and adjusting the air fuel ratio control unti Complete workshop service repair manual with electrical wiring diagrams for Caterpillar 3406 & 3406B Disel Engines. Should I back the fuel screw out a The document is a Caterpillar service manual for the 3406 diesel engine from serial number 70V1 and up. This increases the max engine speed by 200-300 RPM. This video explains the proper procedure for completing the injector height adjustment on C10, C11 Jul 24, 2013 · Everythis is mentioned in one thread or another. Whether out at sea or in a remote oilfield, the 3406B is built for endurance. Connect fuel injection lines (4) to fuel injection pump housing, and tighten the fuel injection line nuts to a torque of 40 ± 7 N·m (30 ± 5 lb. Dec 4, 2010 · My fuel and torque screws seem to be adjusted so that when I push them both in there is no additional travel for the fuel screw against the torque spring. Refer to Testing and Adjusting, "Electronic Unit Injector - Adjust" for information on adjusting the height of the injector. it will give the engine more response and smoke, but your issue won't be as bad. Pages are Sep 21, 2009 · Jump to page : 1 Now viewing page 1 [50 messages per page] (PEEC) System Overview The 3406B PEEC Diesel Truck Engine is an electronically-controlled 3406B. Adjusting the diaphragm restores optimal fuel metering, improving Covers: Caterpillar 3406B diesel engine with serial prefixes 7FB 4MG 5KJ Pages: 1,278 Format: PDF files (zipped) File size: 55mb Compatibility: Windows/Mac computers Notes: Bookmarked, searchable, printable, instant download This 9-volume service manual set contains complete specifications, systems operation information, disassembly and assembly procedures, testing and adjusting instructions To adjust the low idle on a Cat 3406B, start by checking the throttle linkage for proper tension and smooth movement. end by: a) connection of governor to fuel injection pump housing b) make adjustment of fuel system setting (See Fuel System Setting in Testing and Adjusting) Posted This document provides instructions for adjusting the electronic unit injectors on a C15 or C18 industrial engine. These screws control the fuel rack position, affecting fuel delivery. Understanding the diagram of this injection pump can help technicians and owners troubleshoot and maintain their equipment more effectively. Helps to prevent screw rotation to complete timing. Turn the keyswitch to the ON position. The Jake brake solenoid should receive power only when the ignition and brake switch are engaged. cat 3406 engine . Adjust the height of the electronic unit injector. Start with small increments, then check engine response and emissions. Turn unit injector adjusting screw (2) clockwise until the correct height is obtained. Over-adjusting can cause poor performance or damage. NOTE: See the Testing and Adjusting section for the adjustment of the fuel ratio control. Mar 29, 2019 · APPLICATION -- Aluminum 9U-7227 Injector Height Adjustment Gauge Tool For CAT Caterpillar 3406E, C-15 and C-16. ft. It describes the required tool and adjustment procedure. We just had the injector pump rebuilt and we installed it today. Check for vacuum leaks or faulty sensors affecting engine speed control. FSC Speed Shop / @fscspeedshop512 FSC Truck Shop / @fsctruckshop6537 FSC Railroad / @fscrailroad2321 My Aftermarket Aftercooler Arrived. Always consult the service manual for exact specifications and use proper tools. Use to quickly, correctly and adjust fuel injectors on CAT engines 3406E, C-15 and C-16.