Description

Yanmar TL120 1997 Parts Catalog – OEM Factory Specs

You’ve got a Yanmar TL120 on the lift with a blown cylinder or a fuel leak, and you need the right part number the first time. Aftermarket catalogs are garbage for this stuff — they’ll list a gasket that’s close enough until you button it up and it leaks. This is the real deal: the Yanmar TL120 1997 Parts Catalog from the factory, 44 pages long, covering the 4TNV84T-XTBL engine serial number 21200008 and up. If you’ve ever wasted an afternoon matching a part from a blurry photocopy, you know exactly why this matters.

Cylinder Block and Head Coverage

Two major sections here: CYLINDER BLOCK and CYLINDER HEAD & BONNET. The block page shows the exact Yanmar part number for the cylinder block assembly (729508-01561), head gasket (129508-01330), camshaft bush (129795-02412), and the head studs (129150-01200). You get the quantity of each item — no guesswork. Page 4 has the exploded diagram with all callouts. If you’re replacing a cylinder head, you’ll see the spacer (129004-01190) and the plug PT1/4 (124160-01910) that likes to corrode. Don’t trust a third-party listing; use the factory drawing.

Camshaft and Crankshaft – Critical Engine Components

The TOC lists CAMSHAFT & DRIVING GEAR and CRANKSHAFT & PISTON as separate chapters. The camshaft section includes the driving gear assembly — you need that gear mesh right or the valve timing jumps. The crankshaft page gives you the main bearing set (129001-02931), thrust bearing (129150-02931), and the undersize bearings (US=0.25: 129150-02871). If you’re doing a bottom-end rebuild, this catalog tells you which bearings to order. No generic “might fit” nonsense. You’ll also find the piston assembly and ring specs in that section.

Fuel System – Injection Pump, Valve, and Lines

Three chapters cover fuel: FUEL INJECTION PUMP, FUEL INJECTION VALVE, and FUEL LINE. The injection pump page shows multiple pump variants (4JH-DT, 4JH-DTF, etc.) with their own part numbers. If you’ve got a TL120 with the 4TNV84T-XTBL, you match your pump serial number to the correct assembly. The injection valve section lists the nozzle and holder parts — crucial for injector rebuild. And the fuel line diagram shows every pipe, clamp, and banjo bolt. Don’t mix up the return line with the supply; the exploded view makes it clear.

Cooling and Lubrication Systems – Don’t Overheat or Starve

COOLING WATER SYSTEM and LUB.OIL SYSTEM are both in the TOC. The cooling section covers the water pump, thermostat housing, hoses, and the fan belt arrangement. The lube oil system includes the oil pan (FLYWHEEL HOUSING & OIL SUMP chapter also ties in), oil pump, filter housing, and all the lines. Page numbers aren’t given in the TOC, but each chapter has its own exploded figure number. If you’re tracking down an oil leak, start with the LUB.OIL LINE chapter — it shows every gasket and O-ring.

Why You Need an OEM Parts Catalog

Third-party aftermarket documentation? I’ve seen them swap a bolt for a stud because the picture was blurry. This is a scan of the original Yanmar publication from 1997. The part numbers are Yanmar’s own, the exploded views are factory drawings, and the quantity column tells you exactly how many of each fastener you need. No translation errors, no “superseded without notice” guesswork. If you’re ordering parts for a TL120, this catalog is the only source that matches the actual engine serial number range. Every other source is a gamble.

Related manuals you might need: Ammann Yanmar B12 B17 1991 Parts Catalog – OEM Factory Specs, Yanmar YB271, B27 1994 Parts Catalog – OEM Factory Specs, Yanmar YB301 YB351 1991 Parts Catalog – 248 Pages OEM.

If you want to understand how the automotive industry standardizes these catalogs, check Automotive Industry Overview and Automotive Industry Overview.

That’s 44 pages of factory data. No filler, no reprints. Access the Factory Manual.

Does this catalog cover the entire TL120 tractor or just the engine?

It covers the engine (4TNV84T-XTBL) only. The TOC lists engine components from cylinder block to generator. For the rest of the TL120 (transmission, hydraulics, etc.), you need the chassis manual.

Are there torque specifications in this parts catalog?

No. This is a parts catalog, not a service manual. It shows part numbers and exploded views but does not provide torque values. You’ll need the Yanmar service manual for assembly specs.

What engine serial numbers are included?

Engine serial number 21200008 and up. The first page states “S/N 21200008-” so it applies to all engines from that number forward.

How many pages and what format?

44 pages, scanned PDF. The pages include a numerical index at the end so you can look up any part number quickly.