Sourcing engine cylinder liners from China

Cylinder liner duty and classification

Read from the UK Trade Tariff on 30 September 2026, heading 8409 covers parts suitable solely or principally for the specified engines. Cylinder liners for spark-ignition piston engines normally fall under 8409 91 00 90; diesel engine liners normally fall under 8409 99 00 90. Both carry 2% duty on goods from China. The table separates wet and dry applications within these shared codes.

The supplied tariff record lists no anti-dumping or countervailing measures and no attached import controls for these lines. It lists conditional suspensions at 0.00 % for specifically described other components, rather than cylinder liners generally. Do not assume that a suspension listed against a shared code applies to your liner.

Confirm the commodity code using the engine application and the liner drawing before shipment. For the wider heading, see engine piston assemblies. The import duty and VAT guide explains the landed tax calculation.

Specify the bore, fit and sealing arrangement

Give the factory the engine model, original part number and an approved drawing or reference sample. State whether the liner is wet or dry, finished or supplied for final machining, and specify the material, heat treatment, hardness, bore finish and corrosion protection.

Define bore diameter, outside diameter, length, flange thickness, seating faces and the permitted variation in roundness and taper. For wet liners, include seal groove geometry and the seals supplied. For dry liners, define the mating block bore and intended fit. Approve a measured first article and a trial installation before releasing production.

Worked duty example

Illustrative example, not a quote: Illustrative batch of replacement diesel cylinder liners for an engine rebuilding business under 8409 99 00 90, invoiced at £8,000 free on board, with £1,200 of freight and insurance to the UK. The customs value is £9,200. Duty at 2% is £184. Import VAT at 20% is charged on the customs value plus duty, £9,384, so it is £1,876.80. Import taxes total £2,060.80; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £184 of duty. The import duty and VAT guide explains each step.

Inspection checklist

Material: match foundry certificates and hardness results to the drawing and the casting batch.

Geometry: measure the bore at different heights and directions; check outside diameter, flange thickness, seating faces and seal grooves.

Finish: inspect honing, scoring, cracks, burrs and sealing surfaces; check the specified bore roughness and trial-fit the approved sample.

Arrival: check for rust and handling damage, reconcile part numbers and quantities, and retain batch labels. Use the same agreed checks at quality inspection before dispatch.

What goes wrong

A matching catalogue number can conceal a different flange, seal groove or outside diameter. Poor bore geometry, unsuitable hardness and inconsistent honing can cause wear or scuffing; damaged wet-liner sealing faces can cause leakage. Keep suspect batches separate and compare measured results with the approved drawing before installation.

Keep casting-to-carton traceability so complaints can be traced to a batch. If your business sells consumer products in the UK, you must not sell products you know or should have known are unsafe. Agree how the supplier will investigate failures and provide replacement parts before ordering.

Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For machinery and equipment, see machinery imports.