4TNV98 Diesel Engine Long Block Assembly 4 Cylinder Bare Engine for Yanmar Excavator Skid Steer Loader

4TNV98 Diesel Engine Long Block Assembly for Yanmar Excavators and Skid Steer Loaders

This is a complete 4TNV98 long block assembly (bare engine / 凸机总成): the cylinder block, crankshaft, pistons, connecting rods, camshaft, cylinder head, oil pump and oil pan are supplied assembled, timed and tested as one unit. It is the practical route when the original engine has scored cylinders, a cracked block, a seized bearing or a warped head, because the workshop swaps the block and reuses its own injection pump, turbocharger and electrical parts. The unit fits 4TNV98 powered compact excavators, skid steer loaders, wheel loaders and generator sets.

Engine Specifications

What the Long Block Includes

• Cylinder block with main bearing caps and liners in place
• Crankshaft, main and connecting rod bearings, thrust washers
• Pistons, piston rings and connecting rods, matched to each bore
• Camshaft, tappets, push rods and valve train, timed before shipment
• Cylinder head assembled with valves, springs and seals
• Oil pump, oil pan, timing gears and front cover
• Head gasket and basic gasket set for assembly

What Is Not Included

• Fuel injection pump, injectors and fuel lines
• Turbocharger, exhaust manifold and air intake parts (on turbocharged variants)
• Starter motor, alternator and wiring harness
• Engine ECU, sensors and control modules
• Radiator, fan, belts and engine mounts

These parts are normally transferred from the old engine. If you need any of them supplied together, tell us the model and we will quote the matching items.

Why Buyers Choose This Long Block

• Bore and crank machined as a set — clearances are set in the workshop, so the engine does not need line boring or re-machining on arrival
• Matched piston and ring set — each bore is fitted with its own piston, which keeps compression even across all four cylinders
• Timed and leak tested — valve timing and head bolt torque are checked before packing, so a cold start problem is caught at our end
• Casting quality checked — block and head are pressure tested for porosity, the usual cause of coolant and oil mixing on rebuilt engines
• Cost against a full engine — reusing the injection system and accessories brings the repair cost well below a complete engine assembly

Typical Symptoms That Call for a Long Block

• Low compression, hard starting, heavy blow-by or blue smoke
• Cracked cylinder block or head, coolant and oil mixing
• Knocking from the bottom end, failed main or rod bearing
• Scored cylinder walls after an overheating event or oil starvation
• Repeated head gasket failure that has already warped the deck

Installation and Break-In Notes

1. Confirm the old engine plate reads 4TNV98 and check the machine model; if the engine has been replaced before, send photos of the plate and both sides of the block
2. Transfer the injection pump, injectors and timing marks carefully, and set pump timing to the workshop manual value
3. Replace the oil filter, fuel filter and air filter, and use the oil grade specified for your ambient temperature
4. Prime the oil system by cranking without fuel before the first start, then run at low idle and check oil pressure
5. First 50 hours: avoid full load, recheck head bolt torque and valve clearance, then change oil and filter

Packing and Shipping

The engine is fixed on a pallet, wrapped in anti-rust film and packed inside a fumigated wooden case with moisture absorbent bags. We supply loading photos, packing list and commercial invoice before dispatch, and ship by sea for full units or by air and express for urgent single orders.

FAQ

Q: Is this a complete engine or only the long block?
A: It is a long block assembly — block, head, crankshaft, pistons, camshaft, oil pump and pan are included; injection pump, turbocharger, starter and alternator are not. Tell us what you expect to receive and we will confirm in writing before the order.

Q: Is it a genuine Yanmar engine?
A: It is a new aftermarket long block built to 4TNV98 dimensions, priced below genuine units while keeping the same mounting points and internal clearances.

Q: What is the warranty?
A: Six months against manufacturing defects on the block, crankshaft and assembly work, with the break-in procedure followed as written.

Q: What is the minimum order quantity?
A: One set is acceptable, and pricing improves for workshops and dealers ordering several units or mixed engine models.

Q: How long is the lead time?
A: Usually 7 to 15 working days for stock models and 20 to 30 days for production orders, depending on quantity and configuration.

Q: Can you supply the matching injection pump or gasket kit?
A: Yes. Injection pumps, injectors, gasket kits and engine mounts can be added to the same shipment on request.

Regional Buyer FAQ

North America and Europe

Q: Do you supply CE or EPA documents?
A: The long block is a replacement component, so machine-level CE or EPA certificates do not apply. We provide material certificates, test records and the commercial documents your customs broker needs, and can confirm the emission tier the engine is built to before the order.

Q: How is such a heavy unit packed for import?
A: The engine travels on a pallet inside a fumigated wooden case with ISPM 15 marking, plus loading photos and a packing list before dispatch.

Middle East and Gulf

Q: Does the engine suit hot climate operation?
A: Yes, with the correct oil grade and cooling system in good order. We mark the recommended oil viscosity for ambient above 45 C on the packing note and suggest a radiator and thermostat check at the same time.

Q: Do you accept L/C for fleet or dealer orders?
A: Yes, T/T and L/C are both accepted, and repeat buyers can be supplied against a rolling schedule.

Southeast Asia

Q: How do you protect the engine from rust during sea freight?
A: The unit is oil coated, wrapped in anti-rust film and packed with moisture absorbent bags inside the wooden case, which suits humid destinations.

Q: Can several engine models share one container?
A: Yes, mixed models are commonly loaded together, and we photograph the loading so each unit can be identified on arrival.

South America

Q: Is the engine suitable for high altitude mines?
A: Naturally aspirated engines lose some power with altitude, which is normal. Confirm the machine's working altitude so we can advise on fuel setting and cooling, and we can supply Spanish documents.

Africa

Q: Our mechanics are experienced with in-frame repairs, will the long block fit their workflow?
A: Yes, that is the main use of a long block — the old accessories are transferred to the new block. We supply an assembly note and can send photos of the deck and timing marks before shipping.

Q: Can you add gaskets and filters to the same case?
A: Yes, gasket kits, filters and mounts are frequently shipped with the engine so the repair is not held up by missing consumables.

Russia and CIS

Q: How does the engine start in low temperature?
A: Cold starting depends on the battery, glow system and oil grade. We mark the recommended viscosity for below -25 C and can supply low temperature seals and a block heater on request.

Q: Which documents are provided for customs?
A: Commercial invoice, packing list, fumigation certificate, certificate of origin on request, and a technical description sheet with engine model and displacement for correct classification.

About Us

We focus on after-market hydraulic and powertrain maintenance parts for construction machinery, covering hydraulic pumps, travel motors, swing motors, control valves, gear pumps, gearboxes and diesel engine assemblies for excavators, mining dump trucks, skid steer loaders, rotary drilling rigs, pile drivers, concrete mixers, pump trucks, cranes and harvesters. Our workshop supplies both single-part repair orders and full overhaul kits.