King MB7039XP0.25 main bearings for BMW M20 and M50 6-cylinder engines with crankshaft ground 0.25 millimetres undersize. This is a 0.25 millimetre oversize main bearing set and is used during engine rebuilds where the crankshaft has been ground 0.25 millimetres under standard size.
The King XP Series is developed for engines with high load and prolonged hard use. The bearings are manufactured as tri-metal bearings with copper/lead bearing material and King's pMaxBlack surface treatment, which provides high load capacity, good wear resistance and a stable oil film under demanding use. The XP Series is developed for performance and motorsport engines where greater demands are placed on the bearings than in normal road use.
MB7039XP0.25 fits BMW M20 and M50 engines in 2.0L, 2.5L and 2.7L versions. The set is used on crankshafts ground 0.25 millimetres under standard dimension and is relevant for classic BMW rebuilds, tuning, track use and motorsport.
Specifications:
Type: King XP main bearing set
Series: XP Series / pMaxBlack
Material: Tri-metal copper/lead
Crankshaft: Crankshaft ground 0.25 millimetres under standard size
Oil clearance: Standard oil clearance
Bearing type: Upper and lower main bearings
Contents: 14 bearing halves (7 complete main bearings)*
King Engine Bearings part number: MB7039XP0.25
*12 x M7016U/M5578L bearing halves for positions 1-5 and 7, and 2 x F7016U/F7039L bearing halves for position 6.
Fits engine codes:
M20 / M50
