REMOVAL & INSTALLATION
The camshaft bearings are an integral part of the cylinder head on the 4.6L engine. If the camshaft bearing surfaces are damaged, or the oil clearance is excessive and the camshaft journals are within specification, the cylinder head must be replaced or rebored to accept a camshaft with oversize journals. Check the camshaft oil clearance as follows:
- Remove the camshaft according to the procedure in this section.
- Clean the camshaft journals and the bearing surface. The camshaft journal and bearing surface must be free of oil when using Plastigage®.
- Place the camshaft in the cylinder head.
- Position a piece of Plastigage® on the camshaft journal.
- Install the camshaft cap cluster assemblies and tighten, as described in the installation procedure in this section.
- Remove the camshaft cap cluster assemblies. Measure the oil clearance by comparing the piece of Plastigage® with the measurement scale on the Plastigage® packaging. Compare the measurement with the clearance specification.
- If the clearance exceeds the maximum, remove the camshaft and measure the journal diameters. If the journal diameters are not within specification, replace the camshaft and repeat the oil clearance check. If the camshaft journal diameters are within specification, replace the cylinder head or have it rebored to accept a camshaft with oversize journals.
5.0L and 5.8L Engines
The following procedure requires the use of camshaft bearing set tool T65L-6250-A or equivalent.
- Remove the engine assembly and mount it on a workstand.
- Remove the camshaft, flywheel and crankshaft. Push the pistons to the top of the cylinders.
- Using a sharp chisel or punch and hammer, cut a hole in the center of the rear bearing bore plug. Pry the plug from the bore using a prybar. Be careful not to damage the bore.
- Select the proper size expanding collet and backup nut and assemble them on the expanding mandrel. With the expanding collet collapsed, install the collet assembly in the camshaft bearing, and tighten the backup nut on the expanding mandrel until the collet fits the camshaft bearing.
- Assemble the puller screw and extension, if necessary, and install them on the expanding mandrel. Wrap a cloth around the threads of the puller screw to protect the bearing or journal. Tighten the puller nut against the thrust bearing and puller plate to remove the camshaft bearing. Hold the end of the puller screw to prevent it from turning.
- Repeat Step 5 for each bearing. To remove the front bearing, install the puller from the rear of the block.
See Figures 1 and 2
- Position the new bearings at the bearing bores and install them with the camshaft bearing tool. Center the pulling plate and puller screw to avoid damage to the bearing. Failure to use the correct size collet can cause severe bearing damage. Align the holes in the bearings with the oil holes in the cylinder block before pressing the bearings into place.
Make sure the front bearing is installed 0.005-0.020 in. below the front face of the cylinder block.
- Test fit the camshaft to make sure it turns easily in the bearings. If the camshaft does not turn easily, check if it is bent. If the camshaft is okay, it is possible that one or more of the bearings is cocked or installed incorrectly. If the bearings are okay, check the bearing bore alignment using a straightedge and feeler gauge. If the bores are misaligned, consult an automotive machine shop for possible machining alternatives.
- Apply a light coating of anaerobic sealer to the sealing edge of a new rear bearing bore plug. Install the plug using a suitable driver.
- Install the camshaft, crankshaft and flywheel.
- Install the engine assembly in the vehicle.