All 39 pages of this Yanmar 4TNC88L-RB, B50-2 Parts Catalog (OEM #Y00B4721) cover one engine: exploded views with factory part numbers for every assembly on the 4TNC88L-RB. Inside you get cylinder block, gear housing, flywheel housing, cylinder head, air intake, exhaust manifold, camshaft, crankshaft, lubrication, cooling water, fuel injection pump and pipes, governor, engine stop device, starting motor, and generator. Each exploded view maps a Yanmar part number to every bolt, seal, and bracket, so identifying a plunger, delivery valve, or control rack is a direct lookup, not a phone call to the dealer. Need oversize parts for a rebuild? Spec out 0.25 mm oversize piston rings and 0.25 mm undersize main bearings straight from the factory part numbers. Stop ordering the wrong part. Bookmarked by section and keyword-searchable, pull it up on your tablet and have the exact number ready before you dial.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Piston Ring Oversize | 0.25 | p. 16 |
| Ring Set Oversize | 0.25 | p. 16 |
| Main Bearing Undersize | 0.25 | p. 2 |
| Bearing Thrust Oversize | 0.25 | p. 2 |
| Thrust Bearing Oversize | 0.25 | p. 2 |
| Cylinder Head Bolt Size | M8x16 | p. 2 |
| Gear Housing O-Ring Size | P-16.0 | p. 4 |
| Flywheel Housing Parallel Pin Size | 8x16 | p. 6 |
| Flywheel Housing Drain Plug Size | M22 | p. 6 |
| Cylinder Head Stud Size | M6x20 | p. 8 |
| Cylinder Head Spring Pin Size | 6x12 | p. 8 |
| Air Cleaner Clamp Size | 60 | p. 10 |
Yanmar 4TNC88L-RB, B50-2 Common Problems This Manual Covers
Need the correct Yanmar 4TNC88L-RB complete top-end part numbers after a major overheating event p. 37
Inspect the exploded diagrams starting on page 37. Find the cylinder head gasket and valve stem seals required for a top-end rebuild. Ensure you also order replacement M8x16 cylinder head bolts as referenced on page 2 to complete the repair correctly.
Manual Section: Gasket Set (Optional) & ToolTrying to locate replacement clamp and element retainer part numbers for a damaged air intake p. 10
Check the breakdown on page 10 to find exact replacement codes for your silencer and element retainer. Identify the proper size 60 air cleaner clamp required for reassembly. Cross-reference the part codes with your block serial number to restore proper filtration.
Manual Section: Suction Manifold & Air CleanerFinding exact replacement studs and gasket part numbers for a cracked exhaust manifold p. 12
Review the exhaust system diagram on page 12 to locate the correct silencer stay, nuts, and gaskets. Order the specific M6x20 cylinder head studs referenced on page 8 if the old hardware snapped off. Verify exact quantities before finalizing your parts order.
Manual Section: Exhaust Manifold & SilencerFrequently Asked Questions
What are the replacement specifications for full gasket set?
The manual lists a full gasket set with part number 729430-92601, described as "GASKET SET(NON-ASB.)". This set is for the 4TNC88L-RB engine. A visual representation of the gasket set is available on page 38.
What are the replacement specifications for piston rings?
Replacement piston rings are available, including a "RING SET, PISTON" with part number 129001-22500. Oversize piston rings are also listed, such as "PISTON W/RING OS=.25" (part number 129001-22900) and "RING SET O.S=0.25" (part number 129001-22950), indicating available replacement sizes.
How do you fix need the correct Yanmar 4TNC88L-RB complete top-end part numbers after a major overheating event?
Inspect the exploded diagrams starting on page 37. Find the cylinder head gasket and valve stem seals required for a top-end rebuild. Ensure you also order replacement M8x16 cylinder head bolts as referenced on page 2 to complete the repair correctly.
How do you fix trying to locate replacement clamp and element retainer part numbers for a damaged air intake?
Check the breakdown on page 10 to find exact replacement codes for your silencer and element retainer. Identify the proper size 60 air cleaner clamp required for reassembly. Cross-reference the part codes with your block serial number to restore proper filtration.
What do I get after purchasing this Yanmar 4TNC88L-RB, B50-2 manual?
Instant PDF download. You get the full 39-page searchable Parts Catalog immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Am I able to print pages from this manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Document Quality
This document is a hybrid PDF, featuring native digital text pages alongside high-quality raster images for diagrams. You can search and copy text from all descriptive parts, which is consistently crisp and easy to read throughout the document. Diagrams and illustrations are sharp, with all labels clearly legible at any zoom level. The pages are clean, free of scan artifacts, stains, or skewing, and there are no blank or filler pages present.
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