Timing Tensioner Piston, OEM - 2002, E21, E30, E12, E28, E34, E24, E9, Bavaria, E23, E32, E38, E31 (M10, M30, M70)

This part is listed by BMW as BMW part number 11311744347 (11 31 1 744 347) and is described as Timing Tensioner Piston used on M10 4-cyl, M30 6-cyl, and M70 V12 engines found in 2002, E21, E30, E12, E28, E34, E24, E9, Bavaria, E23, E32, E38, E31 models.

This is the piston tip that contacts the chain rail inside the engine. Either the piston or the rail will wear - ideally the piston because it's easier to replace. But wear on either part will cause a loose or slack timing chain.

This is an OEM Piston manufactured by INA Schaeffler - the original supplier to BMW for this part, as well as many other engine components. As the OEM it meets all of BMW's original design, fitment, and performance requirements and is TUV approved. OEM parts are the best alternative to more expensive Original BMW parts because they are virtually identical without the inflated price tag. This part has a two year warranty.

For full BMW fitment information or for assistance from one of our BMW experts, we recommend calling us at 877-639-9648.