Cylinder Liner (Sleeve)
A cylinder liner is a sleeve that forms the wall of the cylinder in which the piston moves.
What is Cylinder Liner (Sleeve)?
Dry liners are pressed into the block; wet liners are surrounded by coolant. Many aluminium blocks use cast-in iron liners or thin sprayed coatings instead. Liners can be replaced during engine rebuilds. Plasma-sprayed or nanoslide coatings are only a fraction of a millimetre thick, so damaged bores in such engines often cannot simply be re-honed.
How it works
The liner provides a hard, wear-resistant surface for the piston rings to seal against.
Why it matters for your car
Worn or scored liners cause oil use and low compression. Wet liner seals can leak coolant into the oil.
Other terms
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- Coolant Flush (Coolant Change)
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