Perkins 4.248 cylinder block (OEM ZZ50266) for Massey Ferguson 290 and JCB 3C II. Precision main bearing saddles. CNC deck. Fleet supply and export
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This ZZ50266 cylinder block assembly is a premium direct-fit core engineered for the naturally aspirated 4-cylinder Perkins 4.248 (4.0L) diesel engine. Manufactured from high-density grey cast iron with a cylinder bore 101.054mm (3.979 in), this heavy-duty block provides maximum resistance to thermal warpage.
Fleet supply and export.
Our premium aftermarket Perkins 4.248 cylinder block assembly delivers the structural rigidity and high load-bearing capacity required to sustain demanding agricultural tractors and legacy construction equipment. Originally engineered in alignment with Perkins’ legendary off-highway standards—trusted worldwide as the heart of every great machine for agricultural tractor parts and industrial power applications—our assemblies restore original engine torque. Optimized for the 4.0L naturally aspirated 4-cylinder engine, this block directly replaces the OEM Perkins engine block ZZ50266 and U5MK0266 cross reference. Whether you are overhauling a Massey Ferguson 290 block, restoring a vintage Massey Ferguson 178, 185, or 188, repairing a Landini Vision 100 block, or servicing a JCB 3C II backhoe block, our cylinder block preserves factory alignment specs.
Under continuous high-load tillage or heavy excavating operations, engine blocks frequently experience cylinder deck warpage, bore ovality, and main bearing parent bore misalignment. This structural distortion eventually leads to combustion gas bypass, high oil consumption, loss of oil pressure, and blown head gaskets. To eliminate these common agricultural failures, our Perkins cylinder block wholesale selection features premium heavy-duty metallurgy. Cast with a high-nickel, chromium-alloyed grey iron matrix (Brinell hardness HB 187-241) and finished with precise line boring and top-deck machining, our blocks resist thermal fatigue and physical flexing, securing stable oil clearance over long multi-season operations.
| Parameter | Value |
|---|---|
| Engine Type | Perkins 4.248 natural aspiration (4-Cylinder diesel) |
| Cylinder Bore Diameter | cylinder bore 101.054mm (3.979 in) |
| Material Composition | High-strength alloy grey cast iron (HB 187-241) |
| Primary OEM Part Number | ZZ50266 |
| Cross References | U5MK0266 cross reference, 37114630 (Casting), ZZ50223 |
| Main Bearing Saddles | Precision bored main bearing saddle precision alignment |
| Deck Surface Finish | CNC deck surfacing for premium Ra seal finish |
| Quality Testing | 100% pressure leak and casting integrity testing |
Our manufacturing facilities support a complete range of low-wear Perkins engine blocks and cylinder liners. Browse our Perkins cylinder block range to find additional components, replacement main bearings, piston sets, and complete overhaul gasket sets for different tractor platforms.
| Engine Model | Primary Part Number | Cross Ref Part Numbers | Compatible Machine Model |
|---|---|---|---|
| AD3.152 | ZZ90082 | 31358345, U5MK0067 | Massey Ferguson MF240 |
| AD3.152 | ZZ90082 | 31358345 | Massey Ferguson MF135 |
| 4.236 | ZZ50223 | 31358345, 4236 | Massey Ferguson MF165 |
| 4.248 | ZZ50266 | U5MK0266, 4248 | Massey Ferguson MF290 |
| 1004-4 | ZZ50315 | U5MK0653, 1004 | JCB 3CX Backhoe |
| T3.1524 Turbo | ZZ90153 | T31524 | Massey Ferguson MF260 |
| 4.41 | ZZ51187 | 441 | Massey Ferguson MF390 |
This ZZ50266 Perkins 4.248 cylinder block is a direct-fit component calibrated for various high-torque agricultural tractors, materials handlers, and industrial power units:
| Make | Machine Model | Year Range | Engine Model | Application |
|---|---|---|---|---|
| Massey Ferguson | MF290, MF178, MF185, MF188, MF285 | 1970–1999 | Perkins 4.248 (Massey Ferguson 290 block) | Heavy Agricultural Tractor Power |
| JCB | 3C II, 3D Backhoe Loaders | 1975–1988 | Perkins 4.248 (JCB 3C II backhoe block) | Construction Excavation & Loading |
| Landini | Vision 100, 8500 Tractors | 1980–1998 | Perkins 4.248 (Landini Vision 100 block) | Agricultural Field Operations |
| Perkins | 4.248 Stationary Power Units | 1972–1995 | 4.248 naturally aspirated engine | Stationary Pumping & Irrigation |
As a premier industrial diesel engine block manufacturer and direct alternative to a regional UK Perkins parts supplier, we provide micro-balanced block castings designed to maximize field uptime and tractor parts durability:
Misalignment of the main bearing parent bores (saddles) leads to uneven bearing shell wear, crankshaft binding, and rapid bearing failure. It is typically caused by high operating temperatures or block warp. Symptoms include a progressive drop in oil pressure, high bearing temperature, and knocking sounds. Rebuilders must check main bearing saddle precision using a dial bore gauge to verify alignment before installation.
The Perkins 4.248 naturally aspirated engine features a large cylinder bore 101.054mm (3.979 in). Under continuous agricultural operations on Massey Ferguson 290 block tractors, the heat can cause the bore to wear unevenly, leading to cylinder ovality. If ovality exceeds 0.15 mm (0.006 in), it causes severe piston blow-by, excessive blue smoke, and low compression. Rebuilders must measure the bore dimensions using a cylinder dial bore gauge.
While sharing the same external architecture and major mounting positions, the Perkins 4.248 cylinder block (OEM ZZ50266, U5MK0266 cross reference) has a larger cylinder bore 101.054mm compared to the smaller 98.43 mm bore of the Perkins 4.236. Because of this displacement difference, the blocks are not interchangeable. Rebuilders must execute a full cross-reference check using the engine serial number to avoid mismatching.
Block deck flatness must be verified using a straightedge and feeler gauges; resurface the deck if warpage exceeds 0.05 mm to prevent head gasket blowout. CNC deck surfacing ensures a perfect gasket seal. Main bearing saddles must be torqued with caps in place and line bored if out-of-round to ensure crankshaft concentricity.
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