Part of the John Deere Repair Manuals.
An hour from now you could be checking liner protrusion with this John Deere 2.9 L technical manual PDF propped open beside the block: factory document CTM125, 344 pages covering the diesel engine from disassembly sequence through break-in. Rebuild chapters walk the crankshaft, camshaft, liners, pistons, and cylinder head with a measurement at every stage, from journal diameters to timing gear backlash and cam lobe height. Fuel injection gets the heaviest coverage, roughly a third of the book: removal, repair, and dynamic timing for Stanadyne DB2/DB4, Delphi/Lucas, and MICO in-line pumps, plus nozzle testing and turbocharger boost checks. Set intake valve clearance to 0.35 mm and exhaust to 0.45 mm, and resurface any head out of flat beyond 0.08 mm. A guessed torque spec can pull a stud clean out. Print what you need for the bench; grease belongs on those copies, while the bookmarked, text-searchable PDF stays clean on your laptop.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 15-22 | Fire Prevention, Battery Safety, Chemical Safety, High-Pressure Fluid Safety, Maintenance Safety, Waste Disposal |
| General Information | 23-40 | Engine Identification, OEM Engine Option Code Label, Emission Certified Engine Label, Engine References, Basic Engine Specifications, Longitudinal Cut-Away, Transversal Cutaway |
| Engine Mounting | 41-44 | Clean Engine, Engine Lifting Procedure, Engine Repair Stand, Mounting Engine on Repair Stand |
| Engine Rebuilt Guide | 45-50 | Engine Disassembly Sequence, Sealant Application Guidelines, Engine Re-Assembly Sequence, Engine Break-In Guidelines, Perform Engine Break-In, Diesel Engine Break-In Oil |
| Cylinder Head and Valves | 51-74 | Cylinder Head - Exploded View, Check Valve Lift, Remove Cylinder Head, Clean Injection Nozzle Bores, Valve Actuating Parts, Remove Valves and Valve Springs |
| Cylinder Block, Liners, Pistons and Rods | 75-102 | Exploded View, Connecting Rods - General Information, Remove Pistons and Connecting Rods, Measure Cylinder Liner Bore, Remove Cylinder Liners, Cylinder Liner Deglazing |
| Crankshaft, Main Bearings and Flywheel | 103-122 | Remove Crankshaft Pulley, Install Crankshaft Pulley, Check Pulley Wobble, Remove PTO Pulley, Install PTO Pulley, Flywheel Removal, Flywheel Ring Gear Replacement |
| Camshaft and Timing Gear Train | 123-142 | Remove Crankshaft Front Oil Seal, Remove Timing Gear Cover, Measure Timing Gear Backlash, Camshaft End Play Measure, Remove Camshaft, Measure Camshaft Journal |
| Lubrication System | 143-154 | Oil Cooler Identification, Remove Oil Cooler, Replace Oil Cooler Nipple, Install Oil Cooler on Standard Engine, Replace Oil Cooler/Filter Bracket on Engine with Auxiliary Drive |
| Cooling System | 155-166 | Water Pump - Exploded View, Remove Water Pump, Disassemble Water Pump, Assemble Water Pump, Install Water Pump, Inspect Thermostat, Cold Start Advance Switch |
| Air Intake and Exhaust System | 167-178 | Check Air Inlet Pipe, Exhaust Manifold Inspection, Remove Turbocharger, Turbocharger Cut-Away View, Check Radial Clearance, Check Axial Clearance, Repair Turbocharger |
| Fuel System | 179-224 | Replace Fuel Filter Element, Replace Fuel Filter Assembly, Replace Fuel Supply Pump, Remove Stanadyne DB2 or DB4 Fuel Injection Pump, Repairs to Stanadyne Fuel Injection Pump |
| Engine Tune-Up | 225-226 | Preliminary Engine Testing |
| Engine System - Operation | 227-230 | Lubrication System Operation, Cooling System Operation |
| Engine System - Diagnosis and Tests | 231-238 | Diagnose Engine Malfunctions, Checking Engine Compression, Check Engine Oil Pressure, Measure Engine Blow-By, Using Stanadyne Time-Trac As Tachometer |
| Air Intake System - Operation and Tests | 239-244 | Turbocharger Operation, Wastegate Operation, Test Turbocharger Wastegate, Check Turbocharger Boost Pressure, Diagnosing Turbocharger Malfunctions |
| Fuel System - Operation and Tests | 245-344 | Fuel Supply Pump Operation, Measure Fuel Supply Pump Pressure, Fuel Filter Operation |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| M6 Class 4.8 Lubricated | 4.7 N•m | p. 39 |
| M6 Class 4.8 Dry | 6 N•m | p. 39 |
| Intake Valve Clearance | 0.35 mm (0.014 in.) | p. 70 |
| Exhaust Valve Clearance | 0.45 mm (0.018 in.) | p. 70 |
| Cylinder Head Flatness (Max) | 0.08 mm | p. 56 |
| Cylinder Head Bolt Torque (1st step) | 100 N•m | p. 66 |
| Cylinder Head Bolt Torque (2nd step) | 150 N•m | p. 66 |
| Connecting Rod Bolt Torque | 56 N•m | p. 99 |
| Crankshaft Main Bearing Bolt Torque | 135 N•m | p. 121 |
| Flywheel Bolt Torque | 160 N•m | p. 108 |
| Cooling System Test Pressure | 70 kPa | p. 238 |
| Engine Compression Pressure (Minimum) | 2400 kPa | p. 234 |
