A key element for an engine overhaul – a high-quality piston ring set by NEXGEN. It is designed for one piston with a nominal cylinder bore (STD) of 100.00 mm. This set is dedicated to turbocharged Perkins AB (1004-4T) engines and many related models (AC, AD, YB, YH) found in JCB, Caterpillar, and Massey Ferguson machines. The set features specific ring heights (3.5T / 2.5 / 4 mm), where the top compression ring (3.5T) is Molybdenum (Mo) coated for increased resistance to high temperatures and wear.
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| Brand | Type / Series / Model |
|---|---|
| JCB | Backhoe Loaders: 3CX (with 1004-4 engine) Wheel Loaders: 409 TM, 410, 411, 411B, 412, 414S, 415, 416, 416B, 426, 426B, TM200 Telehandlers (Loadall), Excavators (JS), Tractors (FASTRAC) |
| Perkins | 1004 Series: AB (T4.40), AC (C4.40 / 1004-4T), AD (T4.40CC) 1006 Series: YB (T6.60), YC (C6.60), YD (CC6.60), YH (T6.601) |
| Caterpillar | Engines: 3054T Series, 3056 Turbo Series (OEM P/N: 6I-2216, 6I-2221, 7E-9559, 108-0496, 6I-2218, 103-8804) Backhoe Loaders: 426C (with 3054T engine) |
| Massey Ferguson | 700 Series: 760 3000 Series: 3075, 3085, 3120, 3125, 3140, 3610, 3635, 3645, 3655, 3660 4000 Series: 4245, 4255, 4265 6000 Series: 6130 - 6290 8000 Series: 8110, 8120, 8130 |
The list above is extensive. The key is to verify the engine type (e.g., Perkins AB) and the nominal cylinder bore (100.00 mm).
An engine overhaul requires absolute cleanliness. Installing rings must be done in sterile conditions. Any contamination (dirt, debris) entering the cylinder will immediately score the liner and seize the engine. Always ensure the cylinder is properly prepared (honed).
Piston rings seal the combustion chamber, preventing exhaust gases from entering the crankcase and oil from entering the combustion chamber. They also transfer heat from the piston. Their wear is a natural process but leads to serious engine problems.
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This means the top compression ring is 3.5 mm high and has a Taper or Keystone (T) profile, which prevents the ring from "sticking" in the piston groove due to carbon buildup. The (Mo) indicates it is Molybdenum coated, which is crucial for durability in the high temperatures of a turbocharged engine.
2. Will this set fit a naturally aspirated (AA) engine?No. The naturally aspirated (AA) engine uses rings with different heights (typically 2.5 x 2.5 x 4 mm, e.g., part no. 02/201938). This 3.5T set is specifically designed for pistons in turbo (AB) engines.
3. Why must I hone the cylinder when replacing rings?Old rings wear the cylinder wall in a specific way. The surface becomes too smooth ("glazed"), and new rings will not be able to "break in" or seal properly. Honing gives the cylinder wall a specific cross-hatch pattern that holds an oil film and allows the new rings to seat perfectly.
Have doubts or need confirmation to avoid costly downtime? Call us. Our experts will help you choose the right part to get your equipment back to work as soon as possible.
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A set of rings for a turbocharged AB engine, suitable for, among others: for JCB 2CX 3CX 4CX machines, front loaders and telescopic loaders.

















