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Posted on Jan 02, 2017
hello, I notice that you needed a diagram for Q7 chain.
Did you have problems? I own a Q7 3.0TDI and the chain just broke.
AM very disappointed and looking to see if this may be a common problem?thanks you
Posted on Nov 06, 2012
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Nov 14, 2017 | Cars & Trucks
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Timing the Cam to the Crank
There are several ways to time the cam to the crank. Be sure to check the manual before you install the timing chain or belt.
If the old parts are available, carefully compare the new gears or sprockets with the old ones. Check the keyway and timing marks just in case there might have been an error made in manufacturing. Sprockets are sometimes stamped backward. Its much better to find the problem during assembly, rather than waiting until problems show up after reassembly and reinstallation.
Maintaining Valve Timing
During a valve job, it is essential to keep the timing chain or belt in place to maintain correct valve timing. Position the number one cylinder at TDC. Some overhead cam engines use a single long chain for a cam drive. The chain can be wedged against its guides with a tapered block of wood.
the chain tensioner on some ohc engines must be wedged to keep the chain in position during cylinder head removal. courtesy of nissan motors.
Some engines have a lower and upper chain. These engines do not require special attention to wedging the chain. Be sure to look for hidden head bolts and check the repair manual before removing the OHC head.
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Removal & Installation
Fig. Timing belt routing and timing marks-3.5L Engine
Fig. Timing belt and related components-3.5L Engine
Fig. Adjusting the tensioner pulley-3.5L Engine
Fig. Measuring the auto tensioner rod-3.5L Engine
Timing Chain, Sprockets, Front Cover & Seal
Removal & Installation
Fig. Timing chain and related components-3.8L Engine
Fig. Left timing chain markings and installation: (D) exhaust camshaft sprocket (C) intake camshaft sprocket-3.8L Engine
Fig. Right timing chain markings and installation: (C) exhaust camshaft sprocket (B) intake camshaft sprocket-3.8L Engine
Fig. Sealant application (1 inch bead width)-3.8L Engine
Fig. Timing cover sealant application-3.8L Engine
Fig. Timing cover gasket installation (A) gaskets-3.8L Engine
Fig. Timing cover bolt torque sequence and specification-3.8L Engine
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