In Stock4TN78L 4TN78TL-RB Rebuild Kit For Yanmar Engine YB451 YB501 Excavator
For YanmarOverhaul Kits

Overhaul Kits 4TN78L for Yanmar

OEM / REF: 4TN78LSKU: pilotpart993755

4TN78L 4TN78TL-RB Rebuild Kit For Yanmar Engine YB451 YB501 Excavator is a Overhaul Kits replacement part for Yanmar Engine Spare Parts, categorized under Engine Spare Parts > Overhaul Kits. Use OEM part number 4TN78L and confirm machine model, engine model, and serial details before checkout.

Stock
In stock
Condition
New
Fitment
Yanmar Engine Spare Parts
  • Fitment support before you order
  • Worldwide delivery options

Overhaul Kits Description

This Overhaul Kits is indexed for Yanmar Yanmar Engine YB451 YB501 Excavator Item Included: - 1set Full gasekt kit - 4pcs Liner Cylinder/Sleeve - 4pcs Piston, STD size - 4pcs Piston Pin - 4set Ring set for 4pistons, STD size - 8pcs Pin Clips - 8pcs Valves (4pcs Intake Valves + 4pcs Exhaust Valves) - 8pcs Valve Guides - 8pcs Valves Seats (4pcs Intake Valves Seats+ 4pcs Exhaust Valves Seats) - 1set Crankshaft bearing STD size - 1set Connect Rod Bearing STD size - 1Set Crankshaft Thrust washer. Compare reference number 4TN78L against the label on your existing Yanmar component before ordering.

Additional cross references on file: 4TN78TL-RB. If your machine plate shows a different number, submit a fitment inquiry with photos before checkout.

Applications

  • Yanmar Yanmar Engine YB451 YB501 Excavator Item Included: - 1set Full gasekt kit - 4pcs Liner Cylinder/Sleeve - 4pcs Piston, STD size - 4pcs Piston Pin - 4set Ring set for 4pistons, STD size - 8pcs Pin Clips - 8pcs Valves (4pcs Intake Valves + 4pcs Exhaust Valves) - 8pcs Valve Guides - 8pcs Valves Seats (4pcs Intake Valves Seats+ 4pcs Exhaust Valves Seats) - 1set Crankshaft bearing STD size - 1set Connect Rod Bearing STD size - 1Set Crankshaft Thrust washer

Fitment Notes

Brand or application signal
Yanmar Engine Spare Parts
Product family
Overhaul Kits
System category
Engine Spare Parts > Cylinder Components > Overhaul Kits
Recommended verification
OEM number, engine model, serial number, old part photos, and dimensions.

Shipping & Returns

Availability
InStock
Shipping
Shipping quotes can be confirmed before payment for heavy or urgent orders.
Returns
Returns are easier when fitment is confirmed before ordering.
B2B support
Bulk, fleet, and repair-shop requests can be handled through the inquiry form.

Frequently Asked Questions

How do I confirm this part fits my machine?

Match the OEM or reference number first, then verify machine model, engine model, serial number, connector layout, mounting points, and old part photos.

Can I order if my part number is not listed?

Yes. Send the old part number, machine plate, and photos through the fitment inquiry form. Support can review possible replacements or alternatives.

Is this an OEM part?

Products are indexed as replacement parts unless explicitly marked otherwise. Always compare reference numbers and confirm fitment before purchase.

Confirm fitment & quote details

Send machine details and nameplate photos before ordering high-risk or quote-only parts.