Question about Toyota Previa
Dont remove the cam gear until you remove the crank shaft bolt.If you turn the crank with out the cam gear in place you may bend some valves.And damage the head,or a piston as well.
You can use a bar, and a socket on the crank bolt, if it clears everthing and rests on the frame work,then engauge the starter,this will loosen the crank bolt,but dont start the engine.Just a few hits on the key.Stand clear of the bar,!You may have to heat the bolt head a bit,as well.The bolt may have had locktite installed on the threads.Have the battery fully charged.
Posted on Sep 14, 2010
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Posted on Jan 02, 2017
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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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