Need the factory part numbers for your Yanmar 4TNV98-GGE diesel engine? This 29-page parts catalog covers all five variants: the 4TNV98 in NSA, NSA2, and GGE trim, plus the turbocharged 4TNV98T-NSA and 4TNV98T-GGE. Inside: exploded-view diagrams and indexed part numbers for every major assembly, from cylinder block and gear housing to flywheel housing, oil sump, cylinder head, camshaft, crankshaft, and piston. The lub oil system, cooling water system, fuel injection pump and valve, fuel lines, starting motor, generator, and complete gasket set each get their own dedicated section. Variant-specific diagrams separate the NSA and NSA2 gear housing and flywheel housing from the GGE configuration, so you pull the right part number for your exact build. Wrong part, wasted week. Bookmarked and keyword-searchable, it opens on any device so you can confirm the number before you call the counter.
Yanmar Yanmar 4TNV98-4TNV98T Series Common Problems This Manual Covers
Yanmar 4TNV98 fuel system part numbers split across sub-variants, correct filter hard to identify p. 16
Check the fuel system parts list on page 16. Identify your exact model suffix (GGE, NSA, NSA2, or T-variant) before selecting a filter part number, as elements differ across all 5 sub-models. Cross-reference the parts number list on page 3 to confirm the index entry matches your engine serial prefix before ordering.
Manual Section: Fuel Injection PumpMain bearing set part number unclear, engine serial number falls between two catalog ranges p. 5
Locate the block assembly exploded view on page 5, which lists Main Bearing Set entries by position. Verify the 4-cylinder block configuration and serial range before ordering. Cross-index with the parts number list on page 3 to confirm you have the correct set for either the naturally aspirated or turbocharged variant.
Manual Section: Cylinder BlockCooling water pump or thermostat part number won't match, too many similar-looking options in catalog p. 15
Turn to the cooling water system parts list on page 15. Match each part number to your specific model suffix before ordering: both 4TNV98 and 4TNV98T variants appear in the same list with distinct entries. Verify the model designation on your engine nameplate against all 5 sub-model listings to avoid receiving an incompatible component.
Manual Section: Cooling Water SystemGear housing oil seal part number ambiguous, exploded view shows multiple seals with no clear callout p. 6
Open the gear housing exploded view on page 6. Identify each oil seal by its callout number in the Housing Assy section: front crankshaft, timing cover, and rear main positions are listed separately. Confirm the part number suffix matches your model variant (GGE vs. NSA), as the 4-cylinder housing seal kit differs between naturally aspirated and turbocharged configurations.
Manual Section: Gear HousingSensor and harness connector part numbers for electronically governed models missing from standard parts index p. 19
Pull up the electrical parts list on page 19. For electronically governed variants (NSA, NSA2, T-NSA), locate the rack position sensor and rack actuator part numbers under the harness assembly section. GGE models share fewer electrical components. Cross-reference the parts number list on page 3 to confirm applicability across all 5 model variants before ordering.
Manual Section: Starting MotorCylinder head gasket set shows conflicting part numbers across catalog pages, correct entry unclear p. 5
Check the block assembly section on page 5 for the Gasket entry under Cylinder Head. Naturally aspirated and turbocharged variants appear in the same list, distinguished by suffix codes. Verify your exact model (4TNV98 vs. 4TNV98T) and confirm the 4-cylinder engine configuration against the parts number list on page 3 before placing your order.
Manual Section: Cylinder Head & BonnetFrequently Asked Questions
What are the replacement specifications for fuel filters?
The manual lists the fuel filter as part number 119802-55800, described as "FILTER, FUEL". However, it does not provide specific replacement specifications or intervals within this parts catalog. The filter is located in the FUEL LINE section.
What are the replacement specifications for oil filters
The manual identifies the oil filter as part number 129150-35152, described as "FILTER 80X80L". While the part number is provided, the document does not specify replacement intervals or detailed specifications for the oil filter. It is listed under the LUB.OIL SYSTEM section.
How do I identify the correct fuel system part numbers for my 4TNV98 sub-variant?
Check the fuel system parts list on page 16 and identify your exact model suffix (GGE, NSA, NSA2, or T-variant) before selecting a filter part number — elements differ across all 5 sub-models. Cross-reference the parts number list on page 3 to confirm the index entry matches your engine serial prefix before ordering.
Why does the cooling water pump or thermostat part number not match my engine?
Turn to the cooling water system parts list on page 15 and match each part number to your specific model suffix — both 4TNV98 and 4TNV98T variants appear in the same list with distinct entries. Verify the model designation on your engine nameplate against all 5 sub-model listings to avoid receiving an incompatible component.
How do I identify the correct gear housing oil seal part number?
Open the gear housing exploded view on page 6 and identify each oil seal by its callout number in the Housing Assy section: front crankshaft, timing cover, and rear main positions are listed separately. Confirm the part number suffix matches your model variant (GGE vs. NSA), as the seal kit differs between naturally aspirated and turbocharged configurations.
Document Quality
This document is a scanned PDF, but it includes an OCR layer, allowing you to search and copy the full text. The text is generally clear and readable, though it is not as crisp as native digital content and may appear slightly less sharp at high zoom. All diagrams and illustrations are raster images, which means they will pixelate if magnified significantly, but their labels are consistently readable. The pages are clean, free of scan artifacts, stains, marks, or skewed content, and there are no blank or filler pages present.
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