chain tensioner, why different parts?

[yelcab1]

I just replaced the two chain tensioners on my 997 Turbo. There are two different part numbers, and the parts look identical. Can someone tell me...

1. What are the differences between the two?
2. Which way does the nipple point, up or down on left, and on the right?

Needless today, I was very careful to observe which way the old ones point and installed the new ones that way, but one side is now making a lot of clanking noise just like a tensioner not getting enough oil in it.

The oil line on the left is attached to the top of the tensioner cover whereas the oil line on the right does not attach to the tensioner cover (which points down)

[Dmitry at Pelican Parts]

Post a picture of the 2 parts if you can, it'll be easier for members to give you details about them.


-Dmitry

[yelcab1]

Found my own answers.

Bank 1, 1-3 Cyl, tensioner with the open nipple facing up, toward the cap where oil is pumped in.
Bank 2, 4-6 Cyl, tensioner with the open nipple facing down, toward the cap where oil is pumped in.

The difference in the two tensioners must be in the check valve to keep oil in while engine is off where gravity pulls one away from the opening or toward the opening.

[BYprodriver]

Oil pressure is different in different parts of the engine