Need the exact factory breakdown for your marine engine? All 101 pages of this Yanmar 4LH-UT, 4LH-ST, 0CF10-G29805 Parts Catalog PDF (OEM #0CF10-G29805) focus on delivering precise component data for your entire 4LH-UT and 4LH-ST engine family. Open to high-resolution exploded views covering the cylinder block, gear housing, fuel injection pump, and sea water cooling systems. You get every original part number, detailed hardware descriptions, and exploded parts diagrams for wire harness assemblies with part numbers. Verify your hardware matches the factory standard, like the 8x16 mm parallel pins in the cylinder block or the exact M6x18 mm bolts used in the gear housing. Ordering the wrong component burns daylight. Download this bookmarked file right to your tablet, find the exact part number, and get your engine running.
What's Inside This Yanmar 4LH Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 1-2 | Fig.1.Cylinder Block, Remarks (for Adjustment) |
| Gear Housing | 3 | Fig.2.Gear Housing |
| L.O.Sump & Oil Seal Housing | 4-5 | Fig.3.L.O.Sump & Oil Seal Housing, Fig.4.L.O.Sump & Oil Seal Housing, Remarks (Interchangeable by: Ref.No.1-1 & Ref.No.6-1, Ref.No.30) |
| Front Bracket | 6 | Fig.5.Front Bracket, Remarks (Optional Parts for 4LH-Utzay, Stzay) |
| Breather | 7-8 | Fig.6.Breather |
| Label | 9-10 | Fig.7.Label |
| Engine Bracket | 11-12 | Fig.8.Engine Bracket, Remarks (Optional Parts) |
| Cylinder Head & Bonnet | 13-14 | Fig.9.Cylinder Head & Bonnet |
| Suction Manifold & Air Cooler | 15-16 | Fig.10.Suction Manifold & Air Cooler |
| Turbocharger & Mixing Elbow | 17-18 | Fig.11.Turbocharger & Mixing Elbow |
| Turbocharger Component Part | 19-20 | Fig.12.Turbocharger Component Part |
| Camshaft & Crankshaft | 21-22 | Fig.13.Camshaft & Crankshaft, Fig.14.Camshaft & Crankshaft, Remarks (Optional Parts Only for Yx-40, Interchangeable by Simultaneous Replacement with Ref.No.29-1 & Ref.No.32-1) |
| Air Duct | 23 | Fig.15.Air Duct |
| Piston & Connecting Rod | 24 | Fig.16.Piston & Connecting Rod |
| Balancer | 25 | Fig.17.Balancer |
| Lub.Oil Cooler | 26 | Fig.18.Lub.Oil Cooler, Remarks (Interchangeable by Simultaneous Replacement with Ref.No.40) |
| Lub.Oil System | 27-28 | Fig.19.Lub.Oil System |
| Cooling Fresh Water Pump | 29 | Fig.20.Cooling Fresh Water Pump, Remarks (Interchangeable by Simultaneous Replacement with Fig.41, Generator) |
| Cooling Sea Water Pump | 30 | Fig.21.Cooling Sea Water Pump |
| C.F.W.Cooler & Cover | 31-32 | Fig.22.C.F.W.Cooler & Cover |
| Cooling Sea Water Pipe | 33 | Fig.23.Cooling Sea Water Pipe, Remarks (Optional: Part, Parts for 4LH-Ut) |
| Cooling Fresh Water Pipe | 34 | Fig.24.Cooling Fresh Water Pipe |
| Fuel Injection Pump | 35-36 | Fig.25.Fuel Injection Pump, Remarks (Governor Assy and Fuel Feed Pump Assy Is Incorporated in This Fuel Injection Pump Assy) |
| Governor | 37-48 | Fig.26.Governor, Fig.27.Governor, Fig.28.Governor, Remarks (Pitch: 51.5, 52.5, 53.5) |
| Fuel Feed Pump | 49 | Fig.29.Fuel Feed Pump |
| Timer & F.I.Pump Mount | 50 | Fig.30.Timer & F.I.Pump Mount |
| F.I.Valve & F.I.Pipe | 51 | Fig.31.F.I.Valve & F.I.Pipe |
| Fuel Pipe | 52-59 | Fig.32.Fuel Pipe, Fig.33.Fuel Pipe, Fig.34.Fuel Pipe |
| Engine Stop Device | 60 | Fig.35.Engine Stop Device |
| Starting Motor | 61-64 | Fig.36.Starting Motor, Fig.37.Starting Motor, Fig.38.Starting Motor, Fig.39.Starting Motor |
| Generator | 65-71 | Fig.40.Generator, Fig.41.Generator, 41.Generator, Fig.70.Generator, 70.Generator, Fig.42.Generator, 42.Generator, Fig.71.Generator |
| Wire Harness | 72-73 | Fig.45.Wire Harness, 45.Wire Harness |
| Sensor | 74-77 | Fig.46.Sensor, 46.Sensor, Fig.47.Sensor, 47.Sensor, Fig.48.Sensor, 48.Sensor, Fig.49.Sensor, 49.Sensor |
| Clutch | 78 | Fig.50.Clutch, 50.Clutch, Remarks (Optional Parts) |
| Instrument Panel | 79-86 | Fig.51.Instrument Panel, 51.Instrument Panel, Fig.52.Instrument Panel, 52.Instrument Panel, Fig.53.Instrument Panel, 53.Instrument Panel, Fig.54.Instrument Panel |
| Tool | 87-88 | Fig.56.Tool, 56.Tool, Fig.72.Tool, 72.Tool, Remarks (Optional Parts for 4LH-Ut, Utzay, Utz) |
| Bilge Pump(Optional) | 89-94 | Fig.57.Bilge Pump, 57.Bilge Pump, Fig.58.Bilge Pump, 58.Bilge Pump, Fig.59.Bilge Pump, 59.Bilge Pump, Fig.60.Bilge Pump, 60.Bilge Pump |
| Front Driving Device(Optional) | 95 | Fig.63.Front Driving Device, 63.Front Driving Device |
| Fpto Electton Clutch(Bf500/Optional) | 96-100 | Fig.64.Fpto Electton Clutch, 64.Fpto Electton Clutch, Fig.65.Fpto Electton Clutch, 65.Fpto Electton Clutch, Fig.66.Fpto Electton Clutch, 66.Fpto Electton Clutch |
| Safety Label | 101 | Fig.69.Safety Label, 69.Safety Label |
Every system also includes a parts list.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Parallel Pin Dimension | 8x16 mm | p. 1 |
| Bolt Dimension | M6x18 mm | p. 3 |
| Pipe Dimension | 7x300 mm | p. 7 |
Yanmar 4LH Common Problems This Manual Covers
Yanmar 4LH-UT cylinder head and bonnet part numbers needed for gradual compression loss and rough running p. 13
Inspect the cylinder head and bonnet exploded view on page 13 to identify replacement components. Locate the exact M8x45 mm bolts required for the assembly. Match these hardware part numbers against your specific engine serial number before ordering to guarantee a proper fit during your top-end rebuild.
Manual Section: Cylinder Head & BonnetBreather component and hose part numbers needed due to excessive crankcase pressure and oil misting p. 7
Review the breather parts diagram on page 7 to find the correct replacement components. Identify the 7x300 mm pipe required for the routing system. Check the interchangeable parts list to verify if your specific engine configuration uses the standard or optional breather hose assembly before placing your parts order.
Manual Section: BreatherGear housing cover hardware and gasket part numbers required to fix sudden front engine oil leaks p. 3
Check the gear housing exploded view on page 3 for the complete parts list. Locate the specific M6x18 mm bolts needed to secure the housing cover. Verify the correct part numbers for all associated gaskets and seals to ensure you order everything required to fix the front-end oil leak.
Manual Section: Gear HousingCylinder block alignment pin replacement part numbers needed following major internal damage and sudden overheating p. 1
Examine the cylinder block parts diagram on page 1. Find the required 8x16 mm parallel pins needed for proper block alignment. Cross-reference the exact pin part numbers with the master index to ensure you receive the correct hardware for your engine block replacement or complete machine overhaul.
Manual Section: Cylinder BlockFrequently Asked Questions
How do you fix yanmar 4LH-UT cylinder head and bonnet part numbers needed for gradual compression loss and rough running?
Inspect the cylinder head and bonnet exploded view on page 13 to identify replacement components. Locate the exact M8x45 mm bolts required for the assembly. Match these hardware part numbers against your specific engine serial number before ordering to guarantee a proper fit during your top-end rebuild.
How do you fix breather component and hose part numbers needed due to excessive crankcase pressure and oil misting?
Review the breather parts diagram on page 7 to find the correct replacement components. Identify the 7x300 mm pipe required for the routing system. Check the interchangeable parts list to verify if your specific engine configuration uses the standard or optional breather hose assembly before placing your parts order.
How do you fix gear housing cover hardware and gasket part numbers required to fix sudden front engine oil leaks?
Check the gear housing exploded view on page 3 for the complete parts list. Locate the specific M6x18 mm bolts needed to secure the housing cover. Verify the correct part numbers for all associated gaskets and seals to ensure you order everything required to fix the front-end oil leak.
How do you fix cylinder block alignment pin replacement part numbers needed following major internal damage and sudden overheating?
Examine the cylinder block parts diagram on page 1. Find the required 8x16 mm parallel pins needed for proper block alignment. Cross-reference the exact pin part numbers with the master index to ensure you receive the correct hardware for your engine block replacement or complete machine overhaul.
What do I get after purchasing this Yanmar 4LH-UT & variants manual?
Instant PDF download. You get the full 101-page searchable Parts Catalog immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Can I print specific sections of this Yanmar 4LH-UT & variants Parts Catalog?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
Are electrical wiring diagrams included in this Yanmar 4LH-UT & variants manual?
No. This is a parts catalog — it includes exploded parts diagrams and wire harness assembly drawings with part numbers, but does not contain full electrical circuit diagrams.
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