Part of the Yanmar Repair Manuals.
Milky oil in the reservoir of a Yanmar ZT350 means water is getting past a seal somewhere, and finding which one means pulling the drive off the transom the right way. This service manual (Yanmar publication 0BZTD-G00100) walks the whole stern drive end to end: removal and installation from the transom assembly, driveshaft housing teardown, gear housing disassembly and inspection, gimbal housing work, shift cable installation and adjustment, power steering, the power trim system, propellers, and corrosion protection.
Across 333 pages you get part diagrams, disassembly and assembly sequences, tightening torques, special service tools, and a dedicated troubleshooting chapter covering stern drive, performance, power steering, and power trim faults.
It is a downloadable PDF in English, so you can keep it on a laptop at the dock or print just the section you need and let those pages get greasy while the drive is apart.
What's Inside This Yanmar ZT350 Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 10-11 | Revision History |
| Safety | 12-17 | Crush Hazard, Fire and Explosion Hazard, Electrical Hazard, Exhaust Hazard, Entanglement Hazard, Lifting Hazard |
| General Service Information | 18-47 | Responsibilities (Owner / Operator Responsibilities, Dealer / Distributor Responsibilities), Specifications, Identification (Transom Assembly, Stern Drive Assembly) |
| Maintenance | 48-71 | Safety Precautions, Checking, Filling and Changing Stern Drive Oil (Checking Stern Drive Oil Reservoir Level), Checking and Filling Power Trim Pump Fluid |
| Stern Drive | 72-91 | Safety Precautions, Component Identification, Stern Drive Removal From Transom Assembly, Stern Drive Installation to Transom Assembly, Stern Drive Driveshaft Alignment |
| Driveshaft Housing | 92-137 | Safety Precautions, Driveshaft Housing Part Diagrams (Driveshaft Housing and Drive Gear, Universal Joint and Clutch, Case Plate and Shifter), Driveshaft Housing Disassembly |
| Gear Housing | 138-195 | Safety Precautions, General Views, Gear Housing Part Diagrams, Disassembly and Inspection, Gear Housing Assembly |
| Transom Assembly | 196-261 | Safety Precautions, General Views, Transom Assembly Part Diagrams, Gimbal Housing Disassembly, Gimbal Housing Assembly, Tilt-Up Limit Spacer, Speedometer Connection |
| Shift Cable | 262-273 | Safety Precautions, Control Cables, Shift Cable Installation and Adjustment |
| Steering | 274-285 | Safety Precautions, Power Steering Unit Parts Diagram, Steering Cable Specifications, Installation of Steering Cable, Connecting Steering Cables, Power Steering Unit Installation |
| Power Trim System | 286-297 | Safety Precautions, Power Trim Pump Parts Diagram, Power Trim Cylinders Parts Diagram, Power Trim Pump Fluid, Power Trim Cylinders, Power Trim Troubleshooting |
| Propellers | 298-309 | Safety Precautions, Propeller Selection, Propeller Installation, Removing Propellers |
| Corrosion Protection | 310-319 | Safety Precautions, Corrosion Control Parts Diagram, Galvanic Corrosion, Corrosion Control, Shore Power, Underwater Drive Coating, Additional Protection |
| Troubleshooting and Testing | 320-333 | Safety Precautions, Stern Drive Unit Troubleshooting, Performance Troubleshooting, Power Steering Troubleshooting, Power Trim System Troubleshooting, Stern Drive Testing |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Front Propeller Nut Torque | 135 N·m (99 lb-ft) | p. 308 |
| Maximum Input Speed | 4500 rpm | p. 21 |
| Dry Mass (Weight) | 100 kg | p. 21 |
| Standard Bolt M12 Torque | 43-47 N·m | p. 24 |
| Transom Assembly Hinge Bolt M16 Torque | 130-140 N·m | p. 25 |
| Stern Drive Assembly Universal Joint Nut M20 Torque | 190-210 N·m | p. 25 |
| Propeller Nut Outer Torque | 130-140 N·m | p. 25 |
Yanmar ZT350 Common Problems This Manual Covers
Erratic shifting or failure to engage
Contaminated oil and a maladjusted shift cable are the usual suspects when a ZT350 stops shifting cleanly. The Shift Cable section covers control cables plus shift cable installation and adjustment so you can rule out the cheap fix before opening the drive.
Manual Section: Shift Cable p. 262Water in the stern drive oil
Discolored or milky oil at a reservoir check means water is getting in past a seal, and running it that way destroys gears and bearings. The Maintenance section gives the correct procedures for checking, filling, and changing stern drive oil so intrusion gets caught early.
Manual Section: Maintenance p. 48Power trim drifts down or moves slowly
Low pump fluid, a tired pump, or leaking cylinders all show up as a drive that will not hold trim. The Power Trim System section includes pump and cylinder parts diagrams, fluid procedures, and its own troubleshooting coverage.
Manual Section: Power Trim System p. 286Vibration from the universal joint
A worn universal joint telegraphs as vibration that builds with input speed. The Driveshaft Housing section covers the universal joint and clutch with part diagrams and full disassembly, and the brief torque tables list the M20 universal joint nut at 190-210 N·m.
Manual Section: Driveshaft Housing p. 92Gear noise or harsh engagement underway
Whine or clunk from the lower unit points to wear in the gear housing. This section provides general views, part diagrams, and step-by-step disassembly, inspection, and assembly so you can measure what is worn instead of guessing.
Manual Section: Gear Housing p. 138Anodes eaten and housings pitting
Galvanic corrosion works fast on an aluminum drive left in the water, especially with shore power connected. The Corrosion Protection section covers galvanic corrosion, corrosion control parts, shore power, and underwater drive coating.
Manual Section: Corrosion Protection p. 310Heavy or inconsistent power steering
Steering that loads up or wanders often traces to the cable or the power steering unit itself. The Steering section covers steering cable specifications, cable installation and connection, and power steering unit installation.
Manual Section: Steering p. 274Frequently Asked Questions
Which unit does this manual cover?
It is the Yanmar service manual for the ZT350 marine stern drive, publication 0BZTD-G00100, 333 pages in English. It covers the stern drive, driveshaft housing, gear housing, transom assembly, shift cable, steering, power trim, propellers, corrosion protection, and troubleshooting.
Does it cover the engine as well?
No. This manual services the ZT350 stern drive and transom assembly only: drive removal and installation, driveshaft and gear housings, gimbal housing, shift, steering, trim, and propellers. Engine service is a separate manual.
What is the propeller nut torque spec for the Yanmar ZT350 stern drive?
The Propellers section covers propeller selection, installation and removal. This is a twin-propeller drive and the two nuts are NOT the same figure: the front propeller nut is 135 N·m (99 lb-ft) and the rear propeller nut is 80 N·m (59 lb-ft), both from the torque data on page 307. The propeller shaft anode bolt is 30 N·m (22 lb-ft). p. 298
Does it help diagnose shifting and trim faults?
Yes. The Troubleshooting and Testing section covers stern drive unit troubleshooting, performance troubleshooting, power steering and power trim troubleshooting, and stern drive testing, and the Power Trim System and Shift Cable sections carry the related adjustment and repair procedures. p. 320
What format is this manual in?
This is a 333-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Is this Yanmar ZT350 Service Manual printable?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Does this Service Manual have electrical diagrams?
This is a stern drive manual, so there is no wiring chapter. What it does carry on the electrical side is the speedometer connection in the Transom Assembly section and the Power Trim System section with its pump and cylinder parts diagrams and its own troubleshooting. Engine wiring is in the engine manual, which is a separate book.
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