OEM Gear, Oil Pump Driven (Straight Cut): DSM/EVO

Genuine OEM part.

These have been discontinued by Mitsubishi but we still have a small qty remaining.  If the webstore shows stock, we have stock.

This is the oil pump driven gear that came stock on the 6-bolt 4G63 engine.  However, it will physically fit and correctly function within the oil pump housing of a 7-bolt 4G63 engine (both DSM & EVO).

This gear is what is referred to as "straight cut".  The alternative to a straight cut gear is a "helical cut" gear.  Straight cut gears are said to be more efficient than helical cut gears because they generate no axial load on the gear.  This lack of axial load means there is no force trying to push the gear against the housing restraining it (the oil pump housing).   The disadvantage is that it makes more noise than an equivalent helical cut gear (generally referred to as "gear whine").  It is generally accepted that the advantage that straight cut oil pump gears have over the helical cut equivalent is only meaningful at very high speeds and loads such as would be found in racing applications.

NOTE: Photos may show what appears to be imperfections and/or a rough finish. This is a rust preventative coating applied at the factory.

Sold individually.

Applications: 
DSM (1990-99).
EVO (I-IX).