Correctly installing the camshaft in a Gen III Hemi is critical, and knowing the steps for which version you have is just as important.
There are two slightly different aligning process procedures based on Chrysler’s information: an early style and a late style. To install the camshaft properly, align the timing marks, which is also called lining up the dots.
Aligning the Timing Marks for 2003–2008 5.7L and 6.1L Engines
- Lubricate all five cam journals with engine oil or cam lube. Using a paste or cam lube, lube each cam lobe carefully.
- Install the cam carefully into the block. The last two journal alignments can be tricky, so go slowly. A guide (length of dowel rod) threaded into the front journal of the camshaft in place of the cam bolt can help this alignment process on the far end of the cam by giving you some leverage. Remember that it is enclosed so you can’t see where the cam is.
- Install the camshaft thrust plate and torque the bolts to 250 in-lbs. New version is shown.
- Install the tensioner assembly and mounting bolts (250 in-lbs) and the guide assembly (106 in-lbs).
- Retract the tensioner shoe and pin it in place.
- Rotate the camshaft so that the alignment pin and the slot in the cam sprocket must be clocked at the twelve o’clock position.
- Rotate the crankshaft so that the crank keyway is clocked at the two o’clock position. The crankshaft sprocket must be installed so that the dot is at six o’clock position.
- Place the camshaft sprocket and the crank sprocket on the flat bench with the timing marks on the exact centerline through both the camshaft and crank sprocket bores. Carefully place the timing chain around the sprockets so that the single plated (marked) link aligns with the timing mark on the sprocket and the two plated (marked) adjacent links split the timing mark on the crank pulley.
- Lift the timing chain and sprockets, keeping the sprockets tight against the chain in the defined position above.
- Slide both sprockets evenly over their respective shafts and check alignment of the two sets of timing marks.
- Double-check that the production timing chain is installed with the single plated link aligned with the dot on the camshaft sprocket (at the twelve o’clock position) and the crank sprocket is aligned with the dot on the sprocket between two plated timing chain links (at the six o’clock position).
- Install the camshaft bolt and torque to 90 ft-lbs.
- Remove the tensioner pin.
This Tech Tip is From the Full Book, NEW HEMI ENGINES 2003-PRESENT: HOW TO REBUILD. Here are some additional New Hemi books that may interest you as well!
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Aligning the Timing Marks for 2009 and Newer Gen III Hemi Engines
With this procedure, do not install the tensioner and guide yet. With the early engines (2003–2008), the tensioner and guide were part of the thrust plate, so these were installed first. With the newer engines, installing the guide and tensioner early will make it difficult to install the timing chain.
- Install the crank key in the nose of the crank (if not done earlier). If the sprocket is not already on the crank, install the crank sprocket over the nose of the crank aligned on the key. A new timing chain and sprocket set should be installed so the crank sprocket is new.
- Lubricate all four cam journals with engine oil or cam lube. Using a paste or cam lube, lube each cam lobe carefully.
- Install the cam into the block. The last two journal alignments can be tricky, so go slowly. A guide inserted into the front journal of the camshaft (in place of the cam bolt) can give you some leverage and help this alignment process on the far end of the cam.
- Install the camshaft thrust plate and torque to 12 ft-lbs.
- Slide the crank sprocket onto the crank.
- Align the camshaft timing mark on the sprocket so that it sits between the two marked links on the timing chain.
- Install the cam sprocket and chain onto the camshaft.
- Install the camshaft retaining bolt finger tight.
- Align the timing chain single marked link with the timing mark on the crank sprocket and slip the chain onto the crank sprocket.
- Install timing chain guide with two bolts and torque the bolts to 106 in-lbs.
- Install the timing chain tensioner with the shoe retracted and pinned (21 ft-lbs on 6.4L).
- Verify the timing marks. The top cam sprocket timing mark should sit between the two marked links. The bottom timing mark on the crank sprocket should point at the mark on the single marked link.
- Tighten the camshaft sprocket bolt to 90 ft-lbs.
- Remove the tensioner pin.
Written by Larry Shepard and republished with permission of CarTech Inc
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