Part of the Yanmar Parts Manuals.
Strip an L100N6 down to the bare crank and every gasket, bearing, and shim on the bench has a line in this book. It is Yanmar's factory parts catalog, publication number Y00R7080, for the L100N6-MTM and L100N6-METMR engine variants, and it is the reference for ordering the exact part the engine left the works with.
Ten pages cover the whole engine in exploded parts lists: Cylinder Block, Cylinder Head & Bonnet, Crankshaft, Piston & Camshaft, the fuel injection pump and injectors, lube oil pump and governor, starting motor and dynamo, right through to the tool and gasket set page. Rebuilders get the numbers that matter, including 0.25 and 0.50 undersize main and crankpin bearings and matching oversize piston ring sets.
The PDF is bookmarked by section, so you land on the page you need in two clicks, and at 0.24 MB it downloads instantly and prints clean for the bench.
What's Inside This Yanmar L100N6-MTM, L100N6-METMR Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 1 | Block Assy, Cylinder, Gasket, O-Ring, Bearing, Plug, Cover |
| Cylinder Head & Bonnet | 2 | Head Assy, Cylinder, Valve, Spring, Rocker Arm, Nozzle, Bonnet Assy |
| Air Cleaner & Muffler | 3 | Air Cleaner, Muffler, Gasket, Cover, Element Assy, Pipe Assy |
| Crankshaft, Piston & Camshaft | 4 | Camshaft Assy, Crankshaft Assy, Piston, Ring Set, Bearing, Flywheel |
| Lub.Oil Pump & Governor | 5 | LUB.OIL Pump, Governor Assy, Filter Assy, Handle, Spring, Bearing |
| Cooling & Starting Device | 6 | Top Cover, Fan Case, Starter Assy, Recoil, Spring, Washer, Pulley |
| Fuel Injection Pump & Fuel Injection Valve | 7 | F.I.PUMP Assy, Fuel Injector, Nozzle Assy, Valve Assy, Spring, Shim Set |
| Fuel Tank & Fuel Pipe | 8 | Fuel Tank, Fuel Pipe, Filter, Clamp, Gasket, Cock |
| Starting Motor & Dynamo | 9 | Starter, Armature, Coil Assy, Brush, Pinion Assy, Dinamo Assy |
| Tool, Label & Gasket Set | 10 | Label, Tool Assy, Driver, Spanner, Oiler, Gasket Set |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main Bearing Undersize (Option 1) | 0.25 | p. 1 |
| Main Bearing Undersize (Option 2) | 0.50 | p. 1 |
| Piston Ring Oversize (Option 1) | 0.25 | p. 4 |
| Piston Ring Oversize (Option 2) | 0.50 | p. 4 |
| Crankpin Bearing Undersize (Option 1) | 0.25 | p. 4 |
| Crankpin Bearing Undersize (Option 2) | 0.50 | p. 4 |
| Wire Diameter | 0.6 | p. 5 |
| Starter Voltage | 12V | p. 9 |
| Current Limiter Rating | 15A | p. 9 |
| Fuse Rating | 20A | p. 9 |
| Bulb Voltage | 12V | p. 9 |
| Bulb Wattage | 3.4W | p. 9 |
Yanmar L100N6-MTM, L100N6-METMR Common Problems This Manual Covers
Hard starting from top-end wear
A hard-starting engine usually traces back to compression lost through the head: worn valve faces, tired springs, or loose rocker gear. The Cylinder Head & Bonnet page lists the head assembly, valves, springs, rocker arm, and bonnet parts so the whole top end can be ordered in one pass.
Manual Section: Cylinder Head & Bonnet p. 2Recoil starter will not engage
Broken recoil springs and worn pulleys are routine on pull-start engines. The Cooling & Starting Device page breaks out the starter assembly, recoil, spring, pulley, and fan case so you replace the failed piece instead of the whole unit.
Manual Section: Cooling & Starting Device p. 6Air in the fuel, engine stalls
Cracked fuel pipes, a loose clamp, or a clogged tank filter let air into the system and the engine starves or dies under load. The Fuel Tank & Fuel Pipe section identifies every pipe, filter, gasket, clamp, and cock between the tank and the pump.
Manual Section: Fuel Tank & Fuel Pipe p. 8Rough running from worn injection parts
Contaminated fuel eventually shows up as rough combustion and abnormal smoke, and the fix is usually at the injector. The Fuel Injection Pump & Fuel Injection Valve page covers the pump assembly, nozzle assembly, valve assembly, and the shim set for setting the pump back up.
Manual Section: Fuel Injection Pump & Fuel Injection Valve p. 7Oil consumption and blow-by
When the bore is worn and the engine is burning oil, a rebore needs the right parts on hand. The Crankshaft, Piston & Camshaft page lists the piston, ring sets in 0.25 and 0.50 oversize, crankpin bearings in 0.25 and 0.50 undersize, plus the crankshaft, camshaft, and flywheel.
Manual Section: Crankshaft, Piston & Camshaft p. 4No charge or dead electric start
A battery that keeps going flat often turns out to be worn brushes or the dynamo itself rather than the battery. The Starting Motor & Dynamo page lists the 12V starter with its armature, coil assembly, brushes, and pinion assembly, along with the dynamo assembly.
Manual Section: Starting Motor & Dynamo p. 9Main bearing wear at rebuild time
Once the crank journals have been ground, standard bearings will not do. The Cylinder Block page lists main bearings in 0.25 and 0.50 undersize alongside the block assembly, gaskets, O-rings, plugs, and covers, so the bottom end goes back together with the correct clearance.
Manual Section: Cylinder Block p. 1Frequently Asked Questions
Which engine models does this parts catalog cover?
It covers the Yanmar L100N6-MTM and L100N6-METMR engine models and carries Yanmar publication number Y00R7080. If your engine plate shows either of those model codes, this is the matching factory parts book.
Is this a service manual with torque specs and procedures?
No. It is a factory parts catalog: exploded parts lists with Yanmar part numbers and quantities for each system, from the Cylinder Block through the Tool, Label & Gasket Set page. Use it to identify and order the correct parts, not as a step-by-step repair guide.
Does it list oversize and undersize rebuild parts?
Yes. The Crankshaft, Piston & Camshaft section lists piston ring sets in 0.25 and 0.50 oversize and crankpin bearings in 0.25 and 0.50 undersize, and the Cylinder Block section lists main bearings in the same two undersizes for a reground crank. p. 4
What electrical parts can I look up?
The Starting Motor & Dynamo section covers the 12V starter with its armature, coil assembly, brushes, and pinion assembly, plus the dynamo assembly, a 15A current limiter, a 20A fuse, and a 12V 3.4W bulb, all by part number. p. 9
What exactly do I receive with this Yanmar L100N6-MTM Parts Catalog?
Immediate download of the complete 10-page searchable Parts Catalog. Access it on any device, from a laptop at your desk to a phone in the field.
Can I print specific sections of this manual?
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.
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