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5mm ball behind chain tensioner piston


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Hi Tommy,

I know there is a ball within the piston assy. What puzzles me is that the Real OEM's Parts Schematic (No 11/38) shows a 5mm ball between the piston's outer end and the plug. That is, as if the ball was in the space occupied by the spring. With the spring's taper end towards the plug, as specified in BMW's Repair Manual, that 5 mm ball would just float around within the spring. So the question is: is there a second ball ?

NB: I am trying to fix a noise coming from the tensioner. I realized that I did not bleed the tensioner properly. Before I do blled it, I want to know if I should also put that second ball in.

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Guest Anonymous

There is no second ball on any of my M10 and M30 engines. You may as well send it down the intake for all the good/damage that would result. The ball is a check to maintain pressure in the piston/tensioner. I have only seen the ball one time when the containment plate came loose after being in the parts cleaner and inadvertently hot tanked.

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