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86mm C240 3R Diesel Engine Piston Ring Replacement 5-12121-021-0 For Isuzu
Isuzu diesel engine piston ring
,86mm diesel engine piston ring
,diesel piston ring Replacement
86mm Bore C240(3R) Three-Ring Configuration Piston Ring Set Diesel Engine Piston Rings 5-12121-021-0 for Isuzu
The Isuzu C240(3R) piston rings set 5-12121-021-0 is an important component of the diesel engine piston assembly. Installed in the corresponding piston grooves, the rings operate against the cylinder wall and perform essential functions including combustion chamber sealing, lubricating oil control, and heat transfer.
This product is listed for the C240(3R) three-ring configuration, with a reference engine bore of 86mm. Public parts catalogues identify a top compression ring, a second compression ring, and an oil control ring. Each ring has a distinct design and dimension and must be installed in its correct position.
The top ring primarily supports combustion chamber sealing and helps reduce gas leakage. The second ring provides additional sealing and contributes to oil control. The oil control ring regulates the lubricating oil film on the cylinder wall and helps return excess oil to the crankcase. Working together, the three rings help maintain proper engine compression and lubrication.
| Part Number | 5-12121-021-0 |
|---|---|
| Cross References | 8-94104-949-0, R17390 |
| Engine Model | Isuzu C240(3R) |
| Ring Configuration | 3-Ring Set (Top Compression, Second Compression, Oil Control) |
| Reference Bore Diameter | 86mm |
| Application | Diesel engine repair, overhaul, and replacement |
The product is identified by part number 5-12121-021-0, with catalogue cross references including 8-94104-949-0 and R17390. These references help purchasing teams identify the corresponding product using original and alternative part numbers.
This product is listed for the Isuzu C240(3R) three-ring engine configuration, consisting of one top compression ring, one second compression ring, and one oil control ring. Each ring performs a different function. Correct selection and installation help maintain cylinder sealing and effective oil control.
Public parts catalogues list the compatible C240(3R) engine with an 86mm bore. Bore diameter is an important reference when selecting replacement piston rings. Before purchasing, buyers should confirm the actual engine bore and piston ring dimensions, including whether standard or oversize rings are required, to avoid installation problems caused by incorrect sizing.
Piston rings are important components of the engine combustion chamber sealing system. Compression rings help reduce combustion gas leakage, while the oil control ring helps regulate the lubricating oil film on the cylinder wall. Properly matched piston rings help maintain engine compression, reduce excessive oil consumption, and support stable engine operation.
This product is suitable for diesel engine repair workshops, forklift parts distributors, construction machinery parts wholesalers, and international engine parts importers. For bulk purchasing, buyers can confirm the part number, ring configuration, dimensions, packaging, and stock availability in advance, making quotation and order processing more efficient.
During engine repair and overhaul, piston rings may require replacement because of long-term operation, wear, or abnormal working conditions. Selecting the correct piston ring set requires checking the engine model and part number as well as the bore diameter, ring groove dimensions, ring thickness, and actual piston configuration.
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