Cylinder Liner Audi Manufacturer China: Sourcing Guide
When you evaluate a cylinder liner Audi manufacturer China programme, the catalogue match is only the starting point. The real question is whether the supplier can keep installed-bore geometry, grey-cast-iron consistency, machining repeatability, and batch traceability under control across repeat production. For importers, distributors, engine rebuilders, and private-label buyers, that usually means accurate fitment, controlled interference or clearance, stable honing allowance, and documentation strong enough for internal approval before purchase orders grow. Driventus supplies engine and powertrain parts from Taizhou, Zhejiang, under IATF 16949:2016 and ISO 9001:2015 controls, with export support for private-label and reference-based sourcing programmes. Driventus is an independent aftermarket manufacturer; Audi and other brand names are referenced for fitment only. This guide explains what to check before an RFQ, how dry and wet liner risks differ, which quality records support buyer approval, and when custom manufacturing is the better route if a standard liner does not match your block specification.
What buyers should verify before they RFQ
Start with the drawing package, not the part name. A cylinder liner may be described by engine family, OE reference, sample, or catalogue number, but the RFQ should still be controlled by measurable dimensions and material requirements. For Audi-related programmes, buyers should confirm:
nominal bore, outside diameter, and finish-honing allowance, normally stated separately for supplied and installed condition
interference fit or clearance fit after block preparation, including block-bore size and press-fit temperature method if specified
wall thickness, roundness, cylindricity, perpendicularity, and concentricity requirements
material grade, typically pearlitic grey cast iron or alloyed grey iron, plus hardness band, heat treatment state, and graphite/matrix expectation
surface finish values such as Ra/Rz for OD, seal lands, flange faces, and the bore before or after plateau honing
chamfer angle, edge-break limits, oil-control features, and seal-land details where the liner design requires them
traceability requirements for each heat, production lot, carton, pallet, or shipment batch
If these points are missing, a supplier can still quote, but the chance of a dimensional mismatch rises quickly. A liner that appears correct before installation can distort after pressing, sit high at the deck, or fail final honing if interference allowance, flange geometry, or wall thickness distribution is not properly controlled. In many dry liner projects, small deviations in OD or roundness can turn into much larger installed-bore errors after press fitting and finish honing.
A useful RFQ also gives the target annual volume, sample quantity, packaging format, destination market, and whether you need prototype pieces, pilot lots, or production release. For private-label buyers, include carton artwork rules, barcode formats, pallet height limits, neutral or branded marking requirements, and any restricted materials declaration your customer requires. A complete RFQ helps a China-based manufacturer distinguish a catalogue supply project from a drawing-controlled manufacturing project before price, tooling cost, and lead time are confirmed.
Dry liner vs wet liner sourcing
Dry and wet liners are not interchangeable, and the sourcing risk changes with the design. Identify the liner type before comparing quotations, because the inspection focus, machining sequence, and likely failure modes are different.
Liner type
Typical application
Buyer risk
What to verify
Dry liner
Press-fit into a cast-iron or aluminium block, with no direct coolant contact
Bore distortion, loose fit, cracking, or deck-height error if OD, wall thickness, or interference is wrong
OD tolerance, roundness, wall thickness, counterbore seat, flange geometry, and installed-bore honing allowance
Wet liner
Replaceable sleeve with direct coolant contact
Coolant leakage, liner movement, cavitation erosion, or head-gasket failure if flange and O-ring geometry are wrong
</tr></thead><tbody> </tbody></table>For procurement, the practical question is not just the liner type. It is also whether the block machining is stable enough to keep the installed bore within specification. A dry liner may need tighter OD control, consistent wall thickness, and predictable elastic behaviour during chilled or room-temperature press-fit installation. A wet liner calls for close review of flange flatness, O-ring squeeze, sealing surface finish, coolant-side corrosion resistance, and anti-cavitation expectations.
This is often where supplier review brings hidden risk into view. Ask how the manufacturer controls blank selection, rough turning, stress relief or heat treatment where applicable, semi-finish machining, finish grinding, honing allowance, deburring, washing, rust prevention, and packing. If the liner will be finish-honed after installation, the quote should state clearly whether the supplied part is semi-finished, fully finished, or supplied with buyer-defined machining stock. That distinction helps avoid disputes later, when a sample passes visual inspection but fails assembly, protrusion measurement, leak testing, or final bore inspection.
Quality documents that support approval
Our quality system is built around IATF 16949:2016 and ISO 9001:2015, with export paperwork arranged for EU, UK, North American, Australian, and Brazilian buyers. For programmes that require documented compliance, ask for REACH (EC) No 1907/2006 declarations and a material disclosure sheet at the RFQ stage, before production has started.
Traceability pack
heat number, furnace batch, or incoming material lot linked to the production batch
hardness result, commonly reported in HBW when specified, plus microstructure record when required by the drawing or approval plan
material certificate, chemical composition record, or incoming material inspection record where required
calibration status for gauges used in final inspection, including bore gauges, air gauges, micrometers, height gauges, roughness testers, and CMM or roundness equipment where used
process inspection record for machining steps that affect roundness, cylindricity, wall thickness, surface finish, and deck protrusion
final appearance, washing, rust-prevention oiling, VCI or bagging, and packing check record
corrective-action record for any non-conformance, concession, rework, or deviation approval
This is the minimum set most sourcing teams ask for before moving a sample into approval testing. For higher-volume or private-label programmes, buyers may also request a control plan, process flow chart, FMEA summary, gauge list, measurement system analysis, capability data for critical dimensions, and sample retention rules. Capability requests should name the characteristic, tolerance, sample size, and reporting format, so the supplier knows whether the buyer expects a simple inspection summary or PPAP-style evidence.
Link the request to the quality system early so the document list matches your compliance file. Define inspection frequency, reporting format, change notification, and batch traceability before tooling or production scheduling, because those requirements can affect cost, lead time, packing labels, and shipment release.
How OE cross-references are handled
When an enquiry cites OE 06A107065 or a similar reference, the useful step is to map the liner against the drawing, sample, and engine-code application instead of relying on the number alone. OE references help identify the intended fitment path, but they do not replace dimensional confirmation. The same reference may appear in distributor catalogues, repair data, or aftermarket listings with incomplete technical detail, supersessions, or regional catalogue differences, so production decisions should be based on measurable requirements.
The review should check sleeve length, nominal and finish bore size, outside diameter, flange profile, seat depth, wall thickness, chamfer position, surface finish, and any oil-control or seal-land detail before production starts. If a sample is supplied, measure it against the target block and installation process, not just its visible shape. Useful sample checks include OD mapping at several heights, roundness, flange runout, height, wall thickness variation, hardness, and bore condition. Driventus is an independent aftermarket manufacturer; Audi and other brand names are referenced for fitment only, and no vehicle-maker endorsement is implied.
If the standard part does not fit the block machining or a special wall thickness is required, custom manufacturing is the correct path. Custom work can cover adjusted OD, revised protrusion, alternative grey-iron specification, modified flange, different finish allowance, or packaging for a private-label programme. For standard coverage, browse our catalog and compare the engine family against the required dimensions before submitting the final RFQ.
Lead time, MOQ, and audit readiness
For distributors, repair chains, and importers, the decision points become commercial once the drawing and approval path are stable. Lead time and MOQ are not fixed by the part name alone. They depend on material availability, casting or tube blank preparation, fixture setup, machining cycle time, inspection load, packaging requirements, and whether the item is already in regular production.
MOQ depends on blank route, fixture setup, machining cycle, inspection frequency, and packaging specification
lead time shortens when the sample has already passed dimensional approval and no tooling, fixture, gauge, or artwork adjustment is needed
prototype or pilot lots should be separated from production orders so approval results, concessions, and dimensional revisions remain clear
carton marks, pallet labels, barcode formats, private-label artwork, and country-of-origin marking should be agreed before shipment
rust prevention, VCI packing, inner separators, carton strength, pallet loading, and moisture protection should match sea, air, or courier transport conditions
mixed references can often be consolidated into one export order if the bore family, material route, inspection plan, or packaging format is common
audited suppliers should be able to show process flow, inspection records, gauge control, batch traceability, non-conformance handling, and change-control rules
Audit readiness matters because a cylinder liner is a precision engine component, not a generic metal sleeve. Buyers should expect the supplier to explain how changes in material source, casting or blank supplier, machining fixture, heat treatment, grinding wheel, honing stones, cleaning process, surface protection, or inspection method are reviewed before shipment. That change-control discipline is especially important for repeat orders, where the first approved batch becomes the benchmark for future supply.
If you need a family-level solution across multiple engine codes, the broader engine components range can help consolidate sourcing around one vendor. Start the enquiry with request a quote so the team can align the drawing, volume, sample plan, inspection documents, packing method, and export schedule before commercial terms are finalized.
Frequently asked questions
Drawing, engine code, OE reference if available, sample photos or physical sample, material note, hardness requirement, supplied and installed dimensions, required finish, annual volume, and packaging spec. If you only have a sample, we can start from dimensional measurement and confirm the fitment path before tooling.
Yes. We use OE references for fitment verification only and do not claim vehicle-maker endorsement. The final quote is based on dimensions, material, inspection records, and test requirements.
Commercial invoice, packing list, certificate of origin when requested, inspection report, and compliance declarations such as REACH where applicable. Additional batch records, material records, and dimensional reports can be issued for audit files.
Send the drawing package, OE reference, target block dimensions, and annual volume so we can confirm feasibility and sample plan through [request a quote](/contact.html).
