Two Different Chain Tensioners May Be Installed Depending on the Version:

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Version 1:

Install the -T40243- -arrows-.
Lift up the locking wedge for the chain tensioner by inserting a scriber or a suitable screwdriver into the chain tensioner opening in direction of -arrow 1-. Slowly press and hold the - T40243- in direction of -arrow 2-.

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Secure the chain tensioner using the -T40011-.

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Version 2:

Install the -T40243- -arrows-.
Press the chain tensioner circlip -1- together and slowly press and hold the -T40243- in the direction of -arrow-.

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Secure the chain tensioner with the -T40267-.

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All Versions:

Remove the -T40243-.
Bolt the -T40271/2- to the cylinder head and into the splines on the chain sprocket in the direction of the -arrow 2-. If necessary, turn the intake camshaft with a wrench in the direction of the -arrow 1-.

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With Wrench Clearance:

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Bolt the -T40271/1- to the cylinder head. Counterhold the camshaft with a wrench in a clockwise direction -arrow-.
Remove the bolt -A- and slide the tensioning rail down. At the same time continue counterholding the camshaft.
Turn the exhaust camshaft clockwise in the direction of -arrow- until the -T40271/1- can be slid into the chain sprocket splines.

Without Wrench Clearance:

Bolt the -T40271/1- to the cylinder head.

The help of a second technician is necessary for the following steps.

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Hold the exhaust camshaft securely with the -T10172A- in the direction of the -arrow A-. Remove the bolt -1- and guide the tensioning rail -2- downward.
Turn the exhaust camshaft clockwise in the direction of -arrow A- until the -T40271/1- can be pushed into the chain sprocket splines -C- in the direction of -arrow B-.

All Versions:

NOTE:

Mark the camshafts for the -T40271/1- and -T40271/2-.
When using new camshafts: transfer the self-made markings from the old camshafts to the new camshafts.
Not making the marks will result in much more work when reinstalling.

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Mark the camshaft sprocket to the -T40271/1- and the - T40271/2- -arrow-.
Remove the upper guide rail -1- by unlocking the catch with a screwdriver and pushing the guide rail forward.
Remove the camshaft timing chain from chain sprockets.

NOTE: Risk of Damaging Valves and Piston Crowns

Never turn the crankshaft when the camshaft timing chain is removed.