Part of the John Deere Repair Manuals.
An hour from now you could have the valve cover off and this open beside the engine: CTM3, the 718-page John Deere technical manual PDF covering the Series 220 diesel engine line, seventeen designations from the 3TN66 through the 4TN100. Each engine family gets its own complete rebuild section, cylinder head and valves, pistons and rods, crankshaft and main bearings, camshaft and timing gear train, and those sections take up most of the book. Wiring schematics for the power unit electrical system close out the volume, behind turbocharger failure analysis and fuel system theory of operation. Torque the head cap screws in three passes, 11 N-m, then 22, then a final 34 N-m (25 lb-ft), and replace starter brushes worn past the 7.70 mm minimum before anything goes back together. Every day that engine sits apart on your stand, it earns nothing. Bookmarks and a real text layer put the right clearance table two clicks from the cover.
What's Inside This John Deere Series 220 Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 7-12 | Recognize Safety Information |
| Specifications and General Information | 13-32 | Engine Specifications, Fuels, Lubricants and Coolant, Repair Information |
| Engine Family 3TN66 and 3TNA72 (3009) | 33-192 | 3TN66 and 3TNA72 Engine Service, Specifications, Cylinder Head, Valves and Manifolds, Pistons, Rods and Cylinder Block, Crankshaft, Main Bearings and Flywheel, Camshaft and Timing Gear Train, Lubrication System, Cooling System, Fuel System, Starter, Alternator, Diagnosis, Checks, Tests and Adjustments, Operational Tests |
| Engine Family 3TN75, 3TN78, 3TNC78 (3011), 3TN82, 3TNA82 and 3TN84 (3014) | 193-332 | 3TN75/3TN78/3TNC78 and 3TN82/3TNA82/3TN84 Engine Service, Specifications, Cylinder Head, Valves and Manifolds, Pistons, Rods and Cylinder Block, Crankshaft, Main Bearings and Flywheel, Camshaft and Timing Gear Train, Lubrication System, Cooling System, Fuel System, Starter, Alternator, Diagnosis, Checks, Tests and Adjustments, Operational Tests |
| Engine Family 4TN78T, 4TN82 and 4TN84(T) (4019) | 333-477 | 4TN78T, 4TN82 and 4TN84(T) Engine Service, Specifications, Cylinder Head, Valves and Manifolds, Pistons, Rods and Cylinder Block, Crankshaft, Main Bearings and Flywheel, Camshaft and Timing Gear Train, Lubrication System, Cooling System, Fuel System, Starter, Alternator, Diagnosis, Checks, Tests and Adjustments, Operational Tests |
| Engine Family 4TN100 | 478-580 | 4TN100 Engine Service, Specifications, Cylinder Head, Valves and Manifolds, Pistons, Rods and Cylinder Block, Crankshaft, Main Bearings and Flywheel, Camshaft and Timing Gear Train, Lubrication System, Cooling System, Fuel System, Starter (Nippondenso 1.4 kW), Alternator (Hitachi 25A), Diagnosis, Checks, Tests and Adjustments, Operational Tests |
| Accessories - Series 220 Power Unit Engines | 581-646 | Engine Accessories Specifications, Turbocharger Failure Analysis |
| Engine, Air Intake and Fuel System | 647-689 | Component Location, Theory of Operation |
| Electrical System - Series 220 Power Unit Engines | 690-718 | Introduction, Schematics |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Cylinder Head Cap Screw Torque, First (3TN66, 3TNA72) | 11 N•m (97 lb-in.) | p. 35 |
| Cylinder Head Cap Screw Torque, Second (3TN66, 3TNA72) | 22 N•m (195 lb-in.) | p. 35 |
| Cylinder Head Cap Screw Torque, Final (3TN66, 3TNA72) | 34 N•m (25 lb-ft) | p. 35 |
| Starter, Hitachi 0.8 kW, Cover Bushing I.D. Reamed (3TN66, 3TNA72) | 12.50 - 12.53 mm (0.492 - 0.493 in.) | p. 40 |
| Starter, Hitachi 0.8 kW, Minimum Brush Length (3TN66, 3TNA72) | 7.70 mm (0.303 in.) | p. 40 |
| Fuel Injection Pump Mounting Nut Torque (3TN66, 3TNA72) | 20 N•m (180 lb-in.) | p. 39 |
| Fuel Injection Pump Camshaft Bearing Retaining Screw Torque (3TN66, 3TNA72) | 20 N•m (180 lb-in.) | p. 39 |
| Crankcase Oil Capacity (3TN66, 3TNA72) | 2.5 L (2.6 qt) | p. 106 |
| Cylinder Head Cap Screw Torque, Final (3TN75, 3TN78, 3TNC78) | 69 N·m (51 lb-ft) | p. 216 |
| Cylinder Head Cap Screw Torque, Final (3TN82, 3TNA82, 3TN84) | 78 N·m (58 lb-ft) | p. 216 |
| Rocker Arm Cover Special Nut Torque (4TN78T, 4TN82, 4TN84(T)) | 18 N•m (160 lb-in.) | p. 335 |
| Rocker Arm Assembly Mounting Cap Screw Torque (4TN78T, 4TN82, 4TN84(T)) | 26 N•m (226 lb-in.) | p. 335 |
| Cylinder Head Cap Screw Torque, Final (4TN78T, 4TN82, 4TN84(T)) | 78 N•m (58 lb-ft) | p. 342 |
John Deere Series 220 Common Problems This Manual Covers
Low oil pressure warning at idle and light knocking when engine is hot
Check oil level and condition before tearing in; on the 3TN66 the crankcase holds 2.5 L (2.6 qt), page 106. Verify pressure with a mechanical gauge, then follow the low oil pressure chart. Persistent low readings with knock point to worn main and rod bearings, so plan on plastigauging clearances during teardown.
Manual Section: Tn66, 3Tna72 (3009) p. 165Runs hot and loses coolant, oil film showing in the coolant recovery tank
Pressure test the cooling system and check the thermostat before pulling the head. Oil in the coolant usually means a failed head gasket or a cracked head on these engines. After machining checks, torque 3TN82, 3TNA82, and 3TN84 head cap screws to a final 78 N•m (58 lb-ft) in sequence, page 203.
Manual Section: Tn75, 3Tn78, 3Tnc78 (3011), 3Tn82, 3Tna82, 3Tn84 (3014) p. 203Frequently Asked Questions
What are the torque specs for John Deere Yanmar 3TN66 cylinder head bolts?
The cylinder head mounting cap screws for the 3TN66 engine should be tightened in three stages. The first stage is 11 N•m (97 lb-in.), the second stage is 22 N•m (195 lb-in.), and the final stage is 34 N•m (25 lb-ft). p. 35
Why does a John Deere 3TN66 crank but not fire after sitting, and why does the battery drain fast during crank tests?
Bleed air from the fuel system at the filter and injection pump before condemning parts, then work the “Engine cranks but will not start” column of the troubleshooting chart on page 165. Verify the fuel shutoff solenoid pulls in with the key on. If you pull nozzles for pop testing, torque the mounting nuts to 40 N•m (30 lb-ft) on reassembly. p. 165
Why does the starter drag and turn over slowly on a Series 220 engine, and why does the battery drain after repeated cranking attempts?
Test the starter no load draw before blaming the battery. On the Hitachi 0.8 kW unit, anything past 60 Amps at 7000 rpm means internal drag; pull it down and measure brush length against the 7.70 mm (0.303 in.) minimum on page 149. Clean the cable connections and load test the battery while the starter is out. p. 149
Why does a turbocharged Series 220 engine blow black smoke and lose power under load when boost feels weak?
Check the air cleaner element first; a plugged filter mimics a dead turbo. Inspect the compressor and turbine housings for wheel rub, oil carryover, and joint leaks using the turbocharger failure analysis in the accessories section starting on page 581. On the 4TN78T, retorque exhaust manifold cap screws and nuts to 26 N•m (226 lb-in.) after any boost leak repair. p. 581
What format is this manual in?
A single searchable PDF file of 718 pages, downloadable right after payment. Nothing ships, nothing waits in the mail.
Can I print just the pages I need from this manual?
Yes. No DRM, nothing blocks printing, so run off the pages you need on whatever printer you have.
Does this John Deere 3TN66 manual have electrical schematics?
Yes. The Technical Manual includes an electrical wiring diagram showing how the main circuits run. See page 697 for an example.
Reviews
There are no reviews yet.