Part of the Yanmar Parts Manuals.
Strip the injection pump off a 4TNE94 and you are holding a stack of small parts that must go back on in order, each with its own number when one turns out worn. This catalog, Yanmar publication Y00R4570, identifies every one of them for the 4TNE94-SA and 4TNE94-G1A, whatever machine, genset, or pump the engine came out of.
Nineteen sections break the whole engine into numbered drawings and part lists: cylinder block, cylinder head and bonnet, crankshaft and piston, camshaft and driving gear, the lubricating oil and cooling water systems, injection pump, injection valves, fuel lines, feed pump, governor, starting motor, generator, and a complete gasket set.
Ordering by guesswork costs twice, once for the part that does not fit and again for the days the engine sits apart waiting on the right one. This PDF downloads instantly and puts the correct number against the drawing before you pick up the phone.
What's Inside This Yanmar 4TNE94-SA / G1A Parts Manual
| System | Pages |
|---|---|
| Cylinder Block | 1-1 |
| Gear Housing | 2-2 |
| Flywheel Housing & Oil Sump | 3-3 |
| Cylinder Head & Bonnet | 4-4 |
| Suction Manifold | 5-5 |
| Exhaust Manifold | 6-6 |
| Camshaft & Driving Gear | 7-7 |
| Crankshaft & Piston | 8-8 |
| Lub.Oil System | 9-9 |
| Cooling Water System | 10-10 |
| Fuel Injection Pump | 11-12 |
| Fuel Injection Valve | 13-13 |
| Fuel Line | 14-14 |
| Engine Stop Device | 15-15 |
| Starting Motor | 16-16 |
| Generator | 17-17 |
| Gasket Set | 18-18 |
| Governor | 19-20 |
| Feed Pump | 21-21 |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Thermo switch operating temperature | 110 C | p. 10 |
Yanmar 4TNE94-SA / G1A Common Problems This Manual Covers
Hard starting and long cranking
A 4TNE94 that cranks long and fires late often has air working into the low pressure side or a tired feed pump. The Feed Pump section lists the pump and its fittings by number so you replace the assembly instead of chasing leaks with sealant.
Manual Section: Feed Pump p. 21Overheating from a failed thermo switch
The thermo switch on these engines operates at 110 C, and when it fails the first warning is usually steam. The Cooling Water System section identifies the switch and the rest of the cooling components by part number.
Manual Section: Cooling Water System p. 10Coolant in the oil
Milky oil or compression bleeding between cylinders points at the head gasket. The Cylinder Head & Bonnet section covers the head hardware, so you can order everything for the top end teardown in one pass instead of finding a missing seal mid reassembly.
Manual Section: Cylinder Head & Bonnet p. 4Rough running and smoke under load
Misfire and gray smoke under load usually trace back to worn injection valves. The Fuel Injection Valve section lists the injector parts by number, so the right nozzles are on the bench before the old ones come out.
Manual Section: Fuel Injection Valve p. 13Slow cranking with a good battery
When the battery tests fine but the engine turns over slowly, the starting motor is the next suspect. The Starting Motor section identifies the motor and its hardware so you order once and order right.
Manual Section: Starting Motor p. 16Hunting idle and unstable speed
An engine that hunts at idle or will not hold speed steadily often has wear in the governor. The Governor section lays out the governor components by part number so you can name the worn piece instead of describing it to a parts counter.
Manual Section: Governor p. 19Oil leaks at the sump joint
Oil weeping around the flywheel housing and sump means seals, and identifying the right one from a smeared casting is guesswork. The Flywheel Housing & Oil Sump section shows each part in place so the leak gets fixed the first time.
Manual Section: Flywheel Housing & Oil Sump p. 3Frequently Asked Questions
Which engines does this parts catalog cover?
It covers the Yanmar 4TNE94-SA and 4TNE94-G1A engine models. It is Yanmar publication Y00R4570, a 21 page parts catalog in English, organized into 19 bookmarked sections from Cylinder Block through Feed Pump.
Is this a service manual with torque specs and procedures?
No. This is a parts catalog: numbered drawings and part listings for identifying and ordering components. It tells you exactly what to order for a rebuild, but for disassembly steps, clearances, and torque sequences you would pair it with a service manual.
Does it cover the fuel system?
Yes. Separate sections cover the Fuel Injection Pump, Fuel Injection Valve, Fuel Line, Feed Pump, and Engine Stop Device, each with its own drawing and part numbers, so the whole fuel side of the engine can be ordered from this one document. p. 11
What temperature does the thermo switch operate at?
The Cooling Water System section lists the thermo switch with an operating temperature of 110 C, alongside the other cooling water parts for both the 4TNE94-SA and 4TNE94-G1A. p. 10
What format is this Yanmar 4TNE94-SA manual in?
Instant PDF download. You get the full 21-page searchable Parts Catalog immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Am I able to print pages from this manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
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