Cylinder Liner Mercedes-Benz Manufacturer China
This page is for procurement teams sourcing cylinder liners for Mercedes-Benz engine programmes from China. The emphasis is on dimensional conformity, cast-iron metallurgy, bore geometry, surface finish, traceability, and export pack-out quality, rather than retail fitment advice. Before releasing an RFQ, buyers usually need bore diameter, outside diameter, liner length, flange height, seal-groove geometry, wall thickness, hardness, honing finish, and batch inspection records. Driventus is an independent aftermarket manufacturer; Mercedes-Benz brand names and engine references are used only to identify fitment and technical requirements.
When buyers compare a cylinder liner Mercedes-Benz manufacturer China option with local or regional supply, process capability should come before unit price. The factory must hold the drawing, verify material chemistry, control machining variation, and provide repeatable records from lot to lot. A low ex-works price quickly loses value if the liner creates excessive press load, coolant leakage, unstable piston clearance, poor ring seating, premature bore wear, or added incoming inspection work. For drawing-based production, repeat batches, export documentation, and practical engineering communication, build the sourcing file around measurable requirements from the beginning.
What to send with an RFQ
A strong RFQ for Mercedes-Benz cylinder liners gives the factory enough information to confirm feasibility, quote the right process route, and avoid working from a vehicle model name alone. Start with the engine family, engine code if available, displacement, liner type, annual volume, target market, and whether the request is for a catalogue replacement part or a drawing-controlled programme. A physical sample, unworn reference liner, original drawing, or controlled drawing revision will make the quotation more accurate.
For the first RFQ, the most useful technical data include outside diameter, finished or semi-finished inside diameter, overall height, flange diameter and height, bore finish, hardness target, minimum wall thickness, chamfer details, coolant-seal features, and any coating, anti-corrosion, or storage requirement. If the liner must work with a specific piston and ring package, include piston skirt diameter, ring material and coating, ring face profile, and target piston-to-bore running clearance. If the part will be sold into a repair market, add packaging style, private-label requirements, carton burst strength if specified, barcode format, pallet limit, and destination-country documentation needs.
Choose the right commercial path early. our catalog is suitable for repeat sizes and established aftermarket demand. quality system shows the controls buyers normally audit before approving a Chinese manufacturer. custom manufacturing is better for legacy dimensions, special pack-out, revised tolerances, or drawing-controlled programmes where sample approval is required. If you already have a target size, forecast, and delivery location, request a quote with the part file attached.
For adjacent engine parts, buyers often source the liner together with rings, gaskets, pistons, or related engine components to reduce interface risk. This is especially useful when bore finish, ring seating, piston clearance, and gasket sealing surface all need to work together after installation.
Typical RFQ inputs:
- Engine code, displacement, and application market
- Dry, wet, flanged, or non-flanged liner requirement
- OE reference, aftermarket reference, controlled drawing, or measured sample
- Inside diameter, outside diameter, overall height, flange dimensions, and minimum wall thickness
- Critical tolerances, roundness, taper, cylindricity, hardness, and surface finish
- Finished bore condition: rough-machined, semi-finished, or final-honed
- Cross-hatch angle, plateau honing requirement, and target Ra/Rz/Rpk/Rvk if specified
- Coating, corrosion protection, cleaning, and oiling requirements
- Annual volume, first order quantity, and forecast split by quarter
- Packaging, labelling, palletisation, and export document needs
- Required inspection report format, AQL level, and sample approval process
Dimensional points buyers should lock down
Dimensional control is where supplier claims are proven or exposed. A Mercedes-Benz programme usually needs drawing-level repeatability on the machined features, not just a nominal bore size. The liner must fit the block correctly, support the piston and ring package, seal at the required faces or grooves, and remain stable after machining, installation, and heat cycling.
The purchase specification should separate catalogue description from inspection criteria. A phrase such as "Mercedes-Benz cylinder liner" is not enough for manufacturing control. The factory needs defined tolerances for bore diameter, outside diameter, flange height, seal-groove geometry, concentricity, roundness, taper, cylindricity, and surface finish. Where the original drawing is unavailable, buyers should agree a measured standard from a known-good sample and define which dimensions are critical to function.
Common inspection points
- Outside diameter: controlled to the block interference-fit requirement, with measurement height and inspection temperature stated, commonly 20 C.
- Inside diameter: matched to piston clearance, ring package, and final honing condition; semi-finished liners must state machining allowance.
- Roundness and taper: typical buyer targets are within 0.01-0.02 mm, depending on bore size, liner design, and duty cycle.
- Cylindricity and straightness: useful for longer liners where local bore readings can pass while the full bore form is unstable.
- Bore finish after honing: common cast-iron liner targets are Ra 0.4-0.8 um, with Rz, Rpk, Rk, and Rvk added where ring seating is tightly controlled.
- Cross-hatch angle and plateau condition: often specified around 35-45 degrees for oil retention, ring bedding, and wear control, subject to the ring supplier's requirement.
- Wall thickness: checked at the thinnest section, not only at the nominal section, because thin areas increase distortion and hot-spot risk.
- Flange squareness and top land geometry: important for deck sealing, liner protrusion, installation height, and head gasket life.
- Seal groove dimensions: critical on wet liners where O-ring compression and coolant sealing depend on groove depth, width, radius, and surface condition.
- Chamfers and lead-in edges: important for assembly without shaving seals, damaging rings, or scoring the block.
- Hardness: many grey cast-iron specifications sit in the 220-260 HB range, but the drawing should set the real acceptance band and test location.
Do not release a purchase order until the tolerance stack is clear. A liner that is correct at room temperature but distorts after press-fit or thermal cycling can create rebore, coolant sealing, and warranty problems later. Buyers should also confirm the measuring method: bore-gauge setting master, CMM programme, air gauge if used, micrometer positions, sampling level, and whether the report shows actual readings or only pass/fail results. For repeat supply, actual readings are more useful because they reveal process drift before parts move out of tolerance.
Dry liner or wet liner
Dry and wet liners are not interchangeable sourcing problems. The cooling path, sealing method, machining sequence, and failure risk are different. A dry liner depends mainly on interference fit and heat transfer through the engine block. A wet liner is exposed directly to coolant, so sealing, corrosion resistance, cavitation control, and pressure integrity become much more important.
| Topic | Dry liner | Wet liner |
|---|---|---|
| Cooling path | Heat transfers through the block | Coolant contacts the liner directly |
| Sealing risk | Lower, with simpler installation | Higher, O-ring compression and flange sealing are critical |
| Service focus | Common in many passenger and light commercial engines | More sensitive to corrosion, cavitation, coolant quality, and groove control |
| Buyer check | Interference fit, bore finish, wall thickness, and deck height | Seal grooves, flange protrusion, corrosion protection, and pressure integrity |
| Inspection emphasis | OD/ID size, roundness, taper, cylindricity, and surface finish | Groove geometry, sealing surface quality, leak testing, coating condition, and rust prevention |
| Procurement item | Standard size | Custom programme |
|---|---|---|
| MOQ | Usually lower | Tooling-, casting-, and size-dependent |
| Lead time | Often 30-45 days for production after order confirmation | Often 45-60 days after sample or drawing approval |
| Documents | Dimensional report, CoC, batch traceability | Dimensional report, CoC, material certificate, sample approval, packaging spec, and drawing control |
| Approval route | Catalogue confirmation and pre-shipment inspection | Feasibility review, sample build, dimensional approval, pilot lot, then mass production |
| Best for | Repeat orders and fast replenishment | Legacy engines, private-label supply, controlled tolerances, and drawing-controlled parts |
