Description

Yanmar 3TN66L Parts Catalog – What You Actually Get

You’ve got a Yanmar 3TN66L on the bench, and you need a seal, a bolt, or a thrust bearing. The aftermarket catalogs give you a blurry picture and a part number that doesn’t match. I’ve seen guys order a main bearing based on a third-party cross-reference, and the flange was wrong. That costs you an afternoon and a gasket set. This Yanmar 3TN66L Parts Catalog is the OEM factory document – 33 pages of exploded diagrams, part numbers, and quantities that came straight from Yanmar’s engineering department.

Cylinder Block Assembly: Page-by-Page Breakdown

Page 2 of this catalog shows the cylinder block assembly with every plug, stud, and bearing listed. You see item 1: BLOCK ASSY, CYLINDER (part 719270-01560), then plug PT1/8 (124060-01050), main bearing sets (119260-02800), thrust bearings for standard and 0.25 undersize (119260-02870). The diagram on page 3 (Fig. 1) maps each item to its location. Need the drain plug? Item 21: 171056-49120. That’s a plated bolt, not a brass plug – don’t substitute. The catalog gives you the exact OEM fastener spec so you don’t strip the block.

Gear Housing Components and O-Ring Specs

Pages 4–5 cover the gear case housing assembly: housing assy, gear (119260-01490), oil seal (119620-01800), shim pack (119660-01950), and a dozen bolts with lengths from 16 mm to 65 mm. The O-rings are listed by JIS size: 1A P-32.0 for the filler cover, 1A S-24.0 for the blind cover. If you’re resealing the gear case, you need those exact cross-sections. The aftermarket O-ring kits often skip the oddball sizes. This catalog saves you a return trip to the dealer.

How to Use This Parts Catalog for Rebuilds

This is not a service manual – it won’t tell you torque sequences or clearances. But when you’re ordering parts for a rebuild, you read the exploded diagram, find the item number, and match it to the table. The column layout is: (Figure number, Item number), Part number, Description, Quantity. The 33 pages cover the complete long block: cylinder head studs, gaskets (non-asbestos), oil pan, flywheel housing, and injection pump mounting. I’ve used this catalog to order every nut and seal for a 3TN66L overhaul – zero returns.

Why OEM Yanmar Documentation Matters

Third-party parts catalogs are often photocopies of photocopies. You read “PLUG 40” and wonder if it’s 40 mm diameter or 40 mm length. The Yanmar OEM catalog gives you the family part number (119265-01250) and the drawing reference. That part number cross-references to Yanmar’s own system. If you call a dealer with that number, they hand you the right plug. Half my shop time waste comes from wrong parts. This catalog eliminates that. For the broader context of automotive and equipment repair, you can read the Automotive Industry Overview on Wikipedia – but stay focused on the Yanmar here.

7 Systems Covered Inside This Catalog

• Cylinder block and main bearings
• Gear case housing and oil seals
• Cylinder head studs and gaskets
• Flywheel and clutch housing
• Oil pan and drain plug
• Injection pump mounting brackets
• Water pump and thermostat housing

Every one of these sections uses factory Yanmar illustrations. The part numbers start with 119-, 124-, 171-, 194-, 261- – all genuine Yanmar casting prefixes.

Real-World Application: Ordering the Right Parts

You’re replacing the gear case cover gasket. Page 4, item 25: GASKET, (NON-ASB.) part 119660-01562. Non-asbestos – that matters for modern gasket compatibility. The bolt list shows M6x16, M6x30, M6x40, M6x50, M6x65 plated – all with correct quantities. You hand that list to the parts counter and walk out with a full fastener kit. No guesswork, no second trip. The Yanmar 3TN66L Engine Technical Manual is what you pair with this catalog for torque specs and assembly steps. If you’re working on an Ammann machine, the Ammann Yanmar B12 B17 Parts Catalog uses the same engine platform. For older models, check the Yanmar YB271, B27 1994 Parts Catalog – OEM Factory Specs.

Can I use this catalog to rebuild the whole engine?

No. This is a parts catalog, not a service manual. It lists every OEM part number and quantity, but you still need the factory service manual for clearances, torque sequences, and assembly procedures.

What kind of torque values are in this catalog?

None. Torque specs are only in the service manual. This catalog only provides part numbers, descriptions, and quantities. For example, page 2 lists BOLT M6X12 PLATED (26106-060122) but doesn’t give a torque. The Automotive Industry Overview might mention general bolt classes, but for Yanmar you need the service manual. You can access the factory manual from AutoRepairManuals to get both the parts catalog and the technical manual.

When you’re pulling that 3TN66L out of a skid steer or a generator, you need the right parts in your hand the first time. This 33-page catalog gives you that. Access the factory manual now and stop wasting time on bad part numbers.