Need the right part number for your Yanmar 4TN84L-RBA engine? This 39-page parts catalog (OEM #Y00B4202) covers seven complete systems: Cylinder Block, Gear Housing, Flywheel Housing and Lub. Oil Sump, Cylinder Head and Bonnet, intake and exhaust manifolds, and Camshaft and Driving Gear. Inside, exploded views break every assembly into individually numbered components with factory part numbers and cross-references. You get dedicated fuel injection and electrical sections with the same exploded-view detail as the engine assembly pages. Camshaft key dimensions run 7 x 14 mm; crankshaft and piston spring pins measure 4.0 x 10 mm. That's the fitment data you need before placing an order. Done guessing at worn part numbers. Bookmarked by assembly, searchable by keyword; pull it up on your tablet at the parts counter and order right.
What's Inside This Yanmar 4TN84L-RBA Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 3-4 | Block Assy, Cylinder, Plug PT1/4, Gasket 8, Round, Bolt, Bearing Cap, Main Bearing |
| Gear Housing | 5-6 | Housing Assy, Gear, Seal, Oil, Cap, LUB.OIL Supply, Flange, Gears Housing |
| Flywheel Housing & Lub. Oil Sump | 7-8 | Housing, Flywheel, Cap, Flywheel Cover, Sump Assy, LUB.OIL, Cover, Oil Pan |
| Cylinder Head & Bonnet | 9-10 | Head Assy, Cylinder, Guide, Valve, Seal, Valve Stem, Shaft, Rocker Arm |
| Suc. Manifold & Air Cleaner | 11-12 | Cleaner Assy, Air, Pan Assy, Dust, Element, Strainer, Manifold, Air Intake |
| Exh. Manifold & Silencer | 13-14 | Gasket, Silencer, Manifold, Exhaust, EXH.MANIFOLD, Stud M 8X 22 Plated |
| Camshaft & Driving Gear | 15-39 | Camshaft Assy, Gear, Camshaft, Rod, Push, Shaft, Idle Gear, Gear W/BUSH |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Camshaft Key Dimensions | 7 x 14 mm | p. 14 |
| Spring Pin Dimensions (Crankshaft & Piston) | 4.0 x 10 mm | p. 16 |
| Fuel Injection Pump Spring Pin Dimensions | 5 x 10 mm | p. 22 |
Yanmar 4TN84L-RBA Common Problems This Manual Covers
Yanmar 4TN84L-RBA fuel injection pump shim set: can't identify correct part number for pump timing adjustment p. 24
Check the fuel system exploded view on page 24. The injection pump shim sets are listed under the Camshaft & Driving Gear section. Locate the shim entry in the parts list, note the part number, and verify the quantity required. The injection pump spring pin is a 5x10 mm component; cross-reference adjacent entries to confirm you have the complete shim kit for your serial number range.
Manual Section: Camshaft & Driving GearCan't identify the correct air cleaner element or clamp part number for the intake system p. 11
Open the Suction Manifold & Air Cleaner exploded view on page 11. The air cleaner assembly, dust pan, element, and strainer are all listed separately. The clamp for the air intake connection is sized at 60 mm (page 10); match that spec against the clamp part number in the parts list before ordering to avoid fitment mismatches.
Manual Section: Suc. Manifold & Air CleanerNeed the correct exhaust manifold gasket part number: two different gaskets listed and unclear which fits which position p. 13
Turn to the exhaust manifold and silencer exploded view on page 13. The diagram shows distinct gasket positions for the manifold-to-head joint and the silencer connection. Each gasket carries a separate part number; match the item number in the diagram to the corresponding row in the parts list. The stud spec (M8x22 plated) on the same page helps confirm you're in the right sub-assembly.
Manual Section: Exh. Manifold & SilencerRocker arm shaft or valve stem seal part number needed but cylinder head has multiple seal types listed p. 9
Go to the Cylinder Head & Bonnet parts diagram on page 9. The head assembly lists valve guides, valve stem seals, and rocker arm shaft components as separate line items. Identify each by item number in the exploded view, then match to the parts list. Valve stem seals are listed individually per cylinder, so confirm cylinder count before ordering to get the full set.
Manual Section: Cylinder Head & BonnetMain bearing or thrust bearing replacement: need correct undersize part number and can't tell which grade applies p. 2
Check the parts number list on page 2. Main bearings and thrust bearings are listed with 0.25 mm undersize variants as separate entries. Measure the crankshaft journal to determine which undersize grade you need, then match that to the corresponding part number. Order both main and thrust bearing sets if the journal shows uneven wear across positions.
Manual Section: Cylinder BlockGear housing oil seal part number unclear: catalog shows multiple seals and unsure which covers the front crankshaft position p. 5
Open the Gear Housing exploded view on page 5. The diagram separates the front crankshaft seal from the camshaft and idler gear seals. Each seal has its own item number tied to a distinct part number in the parts list. Confirm the seal position in the diagram before ordering; the housing assembly also includes a lube oil supply flange with its own seal, which is a separate part.
Manual Section: Gear HousingFrequently Asked Questions
How do you fix yanmar 4TN84L-RBA fuel injection pump shim set: can't identify correct part number for pump timing adjustment?
Check the fuel system exploded view on page 24. The injection pump shim sets are listed under the Camshaft & Driving Gear section. Locate the shim entry in the parts list, note the part number, and verify the quantity required. The injection pump spring pin is a 5x10 mm component; cross-reference adjacent entries to confirm you have the complete shim kit for your serial number range.
How do you fix can't identify the correct air cleaner element or clamp part number for the intake system?
Open the Suction Manifold & Air Cleaner exploded view on page 11. The air cleaner assembly, dust pan, element, and strainer are all listed separately. The clamp for the air intake connection is sized at 60 mm (page 10); match that spec against the clamp part number in the parts list before ordering to avoid fitment mismatches.
How do you fix need the correct exhaust manifold gasket part number: two different gaskets listed and unclear which fits which position?
Turn to the exhaust manifold and silencer exploded view on page 13. The diagram shows distinct gasket positions for the manifold-to-head joint and the silencer connection. Each gasket carries a separate part number; match the item number in the diagram to the corresponding row in the parts list. The stud spec (M8x22 plated) on the same page helps confirm you're in the right sub-assembly.
How do you fix rocker arm shaft or valve stem seal part number needed but cylinder head has multiple seal types listed?
Go to the Cylinder Head & Bonnet parts diagram on page 9. The head assembly lists valve guides, valve stem seals, and rocker arm shaft components as separate line items. Identify each by item number in the exploded view, then match to the parts list. Valve stem seals are listed individually per cylinder, so confirm cylinder count before ordering to get the full set.
How quickly can I access this manual after buying?
A 39-page Parts Catalog in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Can I print this manual?
The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
Document Quality
This document is a scanned PDF with an OCR layer, allowing you to search and copy the full text. The text quality is crisp and easy to read throughout. All diagrams and illustrations are raster images, which are clear at normal viewing but may pixelate upon high zoom; their labels are readable. Pages are generally clean with a consistent light grey background from scanning, and some exhibit a slight skew. There are no notable blank or filler pages.
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