Question 1

How to remove and inspect camshafts in 3.5L V6 engine on Chrysler 300?

Accepted Answer

To remove the camshafts, one must first take off the cylinder head(s). Remove the camshaft thrust plate, O-ring seal and camshaft oil seal being careful not to damage the cams bearings or journals. After removal, clean and look for any uneven wear patterns on the lobe besides pitting or seizure on the camshaft. Check whether there is excessive wear or out of round conditions in bearing journals by measuring with a micrometer and comparing these measurements with specifications. Measure each of intake and exhaust camshafts' lobe height to check if there is excessive variation in measurements. Inspect all lobes of a camshaft if they have heat discoloration, score marks, chipped areas, pits or an uneven wear. In case lobes are in good condition and lobe lift variation measurements fall within limits, the cams can be reused. The procedure does not end until after installing lubricated camshafts bearing journals using mineral oil. Then gently insert a new seal at front of head when placing cylindrical head on top of it again. At last mount back side appendage using another O-ring onto head itself where it belonged before then reverse steps as described earlier.

Question 2

How should you visually check and measure the camshaft and its components for wear and damage in 3.0L V6 engine on Chrysler Imperial?

Accepted Answer

Visually check the camshaft bearing surfaces for pitting, score marks, galling, and abnormal wear; if damaged, the head must be replaced. Check camshaft runout by placing the camshaft between two V-blocks and setting up a dial indicator on the center journal, zeroing the dial indicator before turning the camshaft slowly to note the total indicator reading. Record the readings and compare them with the specified runout; if the measured runout exceeds the limit, replace the camshaft. Measure each camshaft lobe height with a micrometer and compare it to the specified height, subtracting the measured height from the specified height to compute wear on the cam lobes, ensuring it does not exceed the specified wear limit; if it does, replace the camshaft. Inspect the contact and sliding surfaces of each hydraulic lash adjuster for scoring or damage, replacing any defective parts. Check the rocker arms and shafts for abnormal wear, pits, galling, score marks, and rough spots, avoiding attempts to restore rocker arms by grinding the pad surfaces, and replace any defective parts.

Question 3

How to remove and install Camshaft in 2.7L V6 engine on Chrysler Sebring?

Accepted Answer

To remove the components, first disconnect the negative battery cable from the remote ground terminal, then remove the valve covers. Next, take out the primary timing chain and the primary camshaft sprockets, followed by the retaining bolts from the secondary timing chain tensioner. Verify the markings on the camshaft bearing caps, ensuring they are marked from 1 to 5 with an "I" or "E" for intake or exhaust, and check for arrow marks indicating the front of the engine. Loosen the camshaft bearing caps in reverse order of tightening, keeping them in order for reinstallation. Detach the bearing caps and remove the camshafts, secondary timing chain, and secondary tensioner as an assembly from the cylinder head, noting the differences between intake and exhaust camshafts. Remove the secondary tensioner and timing chain from the camshafts, then inspect the camshaft secondary sprockets for wear, along with the chains and tensioners for any signs of excessive wear that would necessitate replacement. After cleaning the camshaft, inspect the bearing journals for wear and damage, measuring them with a micrometer to check for excessive wear or out-of-round conditions. Measure the lobe height of each cam lobe on the intake camshaft and record the measurements, ensuring that variations do not exceed 0.010 inch (0.254 mm), and repeat the process for the exhaust camshaft. Check the camshaft lobes for any signs of heat discoloration, scoring, or uneven wear, and if they are in good condition, the camshaft can be reused. For installation, align the secondary timing chain(s) over the camshaft sprockets, ensuring the colored links face outward. Create a U-shaped tool from a paperclip to lock the secondary tensioner in place, then install it back between the camshafts and the secondary timing chain. Apply moly-based engine assembly lubricant to the camshaft lobes and journals, ensuring the rocker arms are properly seated. Install the camshafts, secondary tensioner, and timing chain as an assembly in their original position, with the marks on the sprockets and colored links facing up. Install the bearing caps and bolts, tightening them hand tight before following the proper torque sequence for the bearing cap bolts and tensioner mounting bolts. Finally, install the primary timing chain and camshaft sprockets, completing the installation in reverse order of removal.

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