Pistons, Liners & Rings
Find Pistons, Liners & Rings for your vehicle
Enter your reg and we'll show you only parts that fit — no guesswork.
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- ✓ Free delivery on orders over £40
- ✓ UK stock, dispatched from Northampton
- ✓ Filtered to your specific vehicle from DVLA data
Browse all Pistons, Liners & Rings
- Mahle Mahle Piston Ring Kit Cylinder Bore = 86. 012 20 N0 £36.99
- Mahle Mahle Piston Ring Kit Cylinder Bore = 81. 030 90 N0 £18.99
- Mahle Piston Cylinder Bore = 91mm 014 21 02 £67.99
- Mahle Piston Cylinder Bore = 88mm 004 59 02 £23.99
- Mahle Mahle Crankshaft Bearing Set 029 HS 19911 000 £47.99
- Mahle Piston Cylinder Bore = 81mm 011 70 00 £31.99
- Mahle Mahle Piston Ring Kit Cylinder Bore = 84. 081 RS 00101 0N0 £19.99
- Mahle Mahle Piston Ring Kit Cylinder Bore = 73. 012 18 N0 £18.99
- Mahle Mahle Piston Ring Kit Cylinder Bore = 89. 013 RS 00109 0N0 £32.99
- Febi Engine Intake Valve 29mm Head 199048 £13.99
- Febi Engine Intake Valve 45mm Head 179184 £13.99
- Febi Connecting Rod ID 176858 £254.99
- FAI Piston Cylinder Bore = PK20-000 £79.99
- FAI Engine Intake Valve 35mm Head IV95200 £12.99
- FAI Piston Cylinder Bore = PK25-000 £93.99
- FAI Engine Intake Valve 29mm Head IV181018 £13.99
- FAI Engine Intake Valve 30mm Head IV95062 £16.99
- Febi Engine Intake Valve 49mm Head 178928 £16.99
- Febi Engine Intake Valve 46mm Head 178935 £14.99
- Febi Engine Intake Valve 45mm Head 178839 £14.99
- Febi Valve Guide OD ID 178816 £7.99
- Febi Air Compressor Piston 75mm 178700 £46.99
- Febi Air Compressor Piston 178623 £46.99
- Febi Valve Guide OD ID 178584 £7.99
About Pistons, Liners & Rings
NN4 Online stocks a wide range of pistons, liners & rings from established manufacturers including Mahle, Febi, FAI and Febi Fluids. Enter your registration above and we'll narrow the list to pistons, liners & rings that match your vehicle in the TecDoc catalogue. We always recommend confirming the part dimensions against your existing component before fitting, as specifications can vary between trim levels and engine variants.
All stock dispatches from our Northampton warehouse with free standard delivery on orders over £40 to most UK mainland locations. Browse the full pistons, liners & rings catalogue below, or use the registration lookup to filter to parts matched to your vehicle.
Frequently asked
How do I know a part will fit my car?
Enter your registration above and we cross-check against the TecDoc catalogue to narrow the list to pistons, liners & rings listed against your vehicle. Specifications can still vary between trim levels and engine variants, so we recommend confirming the part dimensions against your existing component before fitting.
What brands do you stock?
We stock established manufacturer brands sourced through trade channels. The brand row at the bottom of this page shows which manufacturers we carry for pistons, liners & rings. We don't sell unbranded parts.
How quickly will my order arrive?
Most orders dispatch from our Northampton warehouse within 1–2 working days. Free standard delivery on orders over £40 to most UK mainland locations.
What if the part doesn't fit?
Please check our returns policy for the current terms. If you're unsure about fitment for your specific vehicle variant, please contact our team before ordering using the details at the bottom of the site.
Can I check fitment before ordering?
Yes — every product page shows whether the part is listed against your selected vehicle. Where multiple sizes exist for the same vehicle, the dimensions are shown so you can compare against your existing part. If you're unsure, contact our team for help confirming the right option.
Brands for Pistons, Liners & Rings
We stock pistons, liners & rings from these manufacturers — each linked to a dedicated brand page with the full range:
About Pistons, Liners & Rings
Our pistons, liners & rings range is built from established UK suppliers and trusted aftermarket brands. Each product is mapped against OE/OEM references and TecDoc ktype data so the reg-lookup above filters to only the parts that fit your specific make, model, engine and trim.
Enter your registration to see exact-fit options — or browse by brand using the tiles above. The full catalogue covers most major makes and models on UK roads, with same-business-day dispatch on stock items ordered before 2pm.
Engine and cooling system parts
Engine and cooling parts span a wide spectrum — timing belts and chains, water pumps, alternators, starters, gaskets and seals. Some are service-interval items (timing belt every 5-10 years or 60-100k miles depending on engine), others are catch-it-early items where small failures can lead to bigger ones if ignored.
Common engine warning signs
- Whining or rattling from the front of the engine — failing belt tensioner or alternator bearing.
- Coolant loss with no visible leak — head gasket, hose or water pump seal.
- Charging warning light or dim headlights at idle — alternator output dropping.
- Slow cranking on cold mornings — starter motor or battery, both worth checking.
Don't postpone a timing-belt service
The biggest avoidable engine failure on the UK fleet is timing-belt overrun. If your service book is missing or the previous owner's record is unclear, get it checked — replacing a belt costs a few hundred pounds; replacing the engine after a belt snap on an interference engine runs into thousands.
Why buy from NN4 Online
- Reg-lookup fitment — see only the parts mapped to your specific vehicle.
- UK warehouses — most stock items dispatch same business day on orders before 2pm.
- Established brands — the brand tiles above are the full list available in this category.
- Standard returns — handled per our returns policy linked in the footer.