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Camshaft Installation Supplement for Nissan QR25DE Engines

February 28th, 2011 · No Comments

1. It is highly recommended that an oil and filter change be done before installing new cams.
2. Remove the ignition coils, valve cover and sprocket cover from the engine. Use caution not to drop anything into the engine. Note the O-ring between the sprocket cover and the front cover, be sure it is but back in place.
3. With the parking brake on, and the car out of gear (neutral), rotate the crankshaft clockwise until #1 cylinder is at TDC (top dead center) with all of it’s valve closed. To insure that this is correct, look at the crank pulley (TDC is the first mark from the left on the pulley). Also check that the cam lobes on #1 cylinder are pointing away from the center of the mo- tor, if they are pointing toward the center, rotate the motor one full rotation clockwise. Again check the crank pulley to see that it is on TDC.
4. Before removing the cam sprockets, the sprocket bolts must be loosened. Using a 17 M.M. socket on the bolts and a 24 M.M. open end wrench on the cam hex (behind the front lobes), break loose, but don’t remove the bolts. Never use the chain to hold the gears while breaking the bolts loose!
5. Carefully mark the chain links that are aligned with the lines on the gears. The lines and the marked links should be exactly the same after installing the new cams. It is impossible for the chain to jump on the crank sprocket because their isn’t enough room between the sprocket and the lower cover.
6. The chain tensioner must be locked by inserting a locking pin (use a small drill bit or wire) on the front of the tensioner. The shoe may pop out and have to be reinserted if this is not done.
7. Remove the sprockets and support the chain by hanging it over a cover bolt as shown in picture on the pdf below.

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