K-Line Bronze Valve Guide Insert /Liners K 1939 8mm x 2.5" x 90 NOS Precision
$208.50
Sale price
$208.50
Regular price
Skip to product information
K-Line Bronze Valve Guide Insert /Liners
Price is for 90 items (as pictured)
New Old Stock (manufactured around year 2000), so there's
some light tarnish on some of them from being in storage.
Part no. 1939-S
Today's Part Number: KL1939STA / KL1939ST
Type: Bronze valve guide insert/liner
Dimensions: 8mm ID x 2.5-inch length
Suited to vehicles with 8mm valve stems
Why K-Line?
Sending worldwide with tracking
K-Line Bronze Valve Guide Insert /Liners K 1939 8mm x 2.5" x 90 NOS Precision
$208.50
Sale price
$208.50
Regular price
The inner spiral (or helical groove) inside the K-Line bronze sleeve serves two critical functions for engine longevity: lubrication control and thermal expansion management.
- Oil Retention & Lubrication: The spiral groove acts like a reservoir. It holds a micro-film of engine oil along the valve stem. This prevents metal-on-metal friction and rapid wear, especially during cold starts before oil pressure fully builds up.
- Scavenging & Oil Control: As the valve moves up and down, the spiral helps wipe away excess oil. This prevents oil from leaking down into the combustion chamber (which causes blue exhaust smoke) while keeping the stem properly lubricated.
- Trapping Debris: It provides a safe channel to trap minute carbon particles or debris, keeping them away from the primary sealing surfaces.
- Flexibility for Sizing: Because these thin-wall bronze liners are pressed into a bored-out guide, the spiral groove gives the metal just enough "give" or displacement room when a machinist pushes a ball-broach or roller-burnisher through to set the final clearance.