Part of the Case Repair Manuals.
The Case N843 and N844 series service manual PDF (OEM 47632257) takes all seven variants of this diesel engine family from compression test through final assembly across 316 pages. Wiring diagrams for the starting circuit, alternator, cold start aid, and injection controls fill roughly the last third of the book. Ahead of that electrical section, teardown procedures work through cylinder heads, rods and pistons, crankshaft and flywheel, and balancer backlash adjustment, each closing with inspection limits you can measure against. Check main bearing clearance to the 0.035 to 0.083 mm standard before ordering shells, then run the head bolts down to 98 to 103 N·m in the printed sequence. Guess at a journal and you pay for the teardown twice. Print the chapter that matches what is on the stand, let those pages take the oil, and keep the bookmarked, text searchable master clean for the next rebuild.
What's Inside This Case N843 and N844 Series Manual
| System | Pages | Key Topics |
|---|---|---|
| Service Manual | 1 | Engine, Electrical Systems, Fuel Injection System, Cooling System, Lubrication System |
| Introduction | 3-8 | Foreword, Foreword - Important Notice Regarding Equipment Servicing, Safety Rules, Safety Rules - Ecology and the Environment |
| Engine and Crankcase | 9-30 | General Specifications, Torque, Compression Test, Port Block Removal, Troubleshooting |
| Pan and Covers | 31-38 | Engine Oil Pan, Timing Gear Housing, Inspection, Installation |
| Valve Drive and Gears | 39-62 | Rocker Arm, Camshaft, Valve Seats, Tappets, Push Rods |
| Cylinder Heads | 63-84 | Cylinder Head Disassembly, Valve Inspection, Head Gasket Selection, Installation |
| Connecting Rods and Pistons | 85-102 | Piston Rings, Connecting Rod Inspection, Piston Pin Bushings, Bearing Inspection |
| Crankshaft and Flywheel | 103-124 | Flywheel Removal, Crankshaft Oil Seal, Main Bearings, Crankshaft Inspection |
| Balancer and Damper | 125-130 | Balancer Removal, Balancer Installation, Shims, Backlash Adjustment |
| Pump Drives, Fuel Injection, Turbocharger, Manifolds, Cooling, Lubrication | 131-220 | Crankcase Gears, Fuel Injection Pump, Turbocharger, Intake/Exhaust Manifolds, Cooling System, Lubrication System |
| Electrical Systems | 221-316 | Cab Engine Controls, Engine Starting System, Alternator, Cold Start Aid, Fuel Injection System, Engine Cooling System, Engine Oil System |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Cylinder head bolts | 98 - 103 N·m (72.3 - 76 lb ft) | p. 16 |
| Crankshaft bearing clearance standard | 0.035 - 0.083 mm (0.0014 - 0.00327 in) | p. 87 |
| Crankshaft bearing clearance maximum | 0.2 mm (0.008 in) | p. 49 |
| Piston diameter standard | 83.948 - 83.963 mm (3.30503 - 3.30562 in) | p. 88 |
| Piston diameter minimum | 83.7 mm (3.2953 in) | p. 88 |
| Piston ring end gap 1st ring maximum | 1.0 mm (0.039 in) | p. 153 |
| Piston ring end gap 2nd ring maximum | 1.0 mm (0.039 in) | p. 153 |
| Connecting rod bearing standard assemble value | 0.035 - 0.085 mm (0.001 - 0.003 in) | p. 87 |
| Pin-to-bushing clearance standard | 0.01 - 0.025 mm (0.00039 - 0.00098 in) | p. 88 |
| Pin-to-bushing clearance maximum | 0.08 mm (0.0031 in) | p. 43 |
| Oil clearance limit | 0.2 mm (0.0078 in) | p. 116 |
| Bushing dimension A | 12.5 mm (0.492 in) | p. 116 |
Case N843 and N844 Series Common Problems This Manual Covers
Case N844 engine cranks but won't start, no fuel at injectors after filter change
Check fuel reaches the injection pump before condemning it; bleed air at the filter and lines. Crack injector lines while cranking to verify delivery to each cylinder. Pop test each injector at the 14824 kPa (2150 psi) opening pressure listed on page 143, watch the spray pattern, then reinstall and torque injectors to 60 - 69 N·m per page 161.
Manual Section: Fuel Injection System TroubleshootingLow compression on one cylinder, rough idle and white smoke at operating temperature
Run a compression test on all cylinders with the engine warm and compare readings. Set valve clearance to 0.2 mm cold per page 51 before testing. If one cylinder stays low, pull the head, inspect valves and seats, then reinstall with head bolts torqued to 98 - 103 N·m per the chart on page 16.
Manual Section: Engine and Crankcase p. 27Heavy oil consumption and blue smoke after rebuild, oil wet at exhaust outlet
Measure ring end gap with each ring squared in its bore; replace the set if the first ring exceeds 1.0 mm (0.039 in) per page 153. Check piston to bore clearance against the 0.038 - 0.072 mm standard on page 88, and inspect valve guides and seals before blaming the rings alone.
Manual Section: Connecting Rods and Pistons p. 85Deep bottom end knock under load, oil pressure light flickers at hot idle
Drop the pan and plastigauge the main bearings, torquing holder bolts to 49.0 - 53.9 N·m per page 120. Replace bearings if oil clearance exceeds the 0.2 mm (0.0078 in) limit on page 116. Measure journals against the 67.957 - 67.97 mm standard on page 106; regrind or replace a worn crankshaft.
Manual Section: Crankshaft and Flywheel p. 103Starter spins but engine won't turn over, or cranks slowly with a charged battery
Test battery voltage under load before pulling the starter, then clean and tighten the ground cable at the block. Inspect the pinion and ring gear teeth for wear or chipped edges. If the battery keeps running down between starts, check charging output; the alternator should deliver 30 A minimum at 2500 RPM per page 259.
Manual Section: Electrical Systems p. 221Frequently Asked Questions
What are the torque specifications for the cylinder head bolts on the N844 engine?
The cylinder head bolts for the N844 engine must be tightened in the specified sequence to a final torque value of 98 - 103 N·m (72.3 - 76 lb ft). p. 76
What is the standard valve clearance for the Case N843H, N843L, N843, N844LT, N844L, N844T, N844 engine?
The intake and exhaust valve clearance for the engine should be adjusted to 0.2 mm (0.008 in) while the engine is cold. p. 51
What is the oil capacity for the engine including the filter?
The engine oil capacity, including the filter, is 10.4 L (11 US qt). p. 15
What is the engine oil filter replacement interval on the Case N843H, N843L, N843, N844LT, N844L, N844T, N844?
The engine oil filter should be replaced every 100 hours of operation, with an initial replacement required at 50 hours. p. 207
What is the fuel injector injection pressure on a Case N843H, N843L, N843, N844LT, N844L, N844T, N844 engine?
The fuel injectors are set at an injection pressure of 14824 kPa (2150 psi). p. 153
What format is this Case N843–N844 Series manual in?
You download the Service Manual yourself: 316 pages, searchable PDF, available immediately. Keep a copy on every device you use.
Can I print a copy of this Case N843–N844 Series Service Manual for the shop?
Yes. The PDF is DRM-free, so printing works from any reader and any printer.
Reviews
There are no reviews yet.