The manufacturer does not recommend that the Hydraulic Lash Adjusters (HLA) be bled. Removing an HLA from its rocker arm will release its oil. If the HLAs are removed from the rocker arms, new ones should be installed using new O-rings.
- Before installing new HLAs, fill the rocker arm oil reservoir with fresh engine oil.
- Apply fresh engine oil to the new HLA and its O-ring.
- Install the new HLA into the rocker arm, taking care not to damage or distort its O-ring.
Removal & Installation
2.3L & 2.5L Engines
A special tool is required to compress the valve spring.
- Remove the valve cover and associated parts as required.
- Rotate the camshaft so that the base circle of the cam is against the cam follower you intend to remove.
If removing more than one cam follower, label them so they can be returned to their original position.
- Using special tool 49-UN01-135 or equivalent, depress the valve spring, as necessary, and slide the cam follower over the Hydraulic Lash Adjuster (HLA) and out from under the camshaft.
- Remove each HLA.
- Install the HLA and cam follower in the reverse order of removal. Lubricate the followers with SAE 50W engine oil meeting current API specification prior to installing.
- Remove the upper and lower intake manifolds.
- Remove the valve covers.
- Remove the rocker arm/shaft assembly.
- Remove and mark the pushrods for installation.
- Remove the tappets with a magnet. If they are to be re-used, identify them.
If the tappets are stuck in their bores, you'll need a claw-type removal tool.
- Coat the new tappets with clean engine oil and insert them in their bores.
- Coat the pushrods with heavy engine oil and insert them into the bores from which they came.
- Install the rocker arm/shaft assembly.
- Install the valve covers.
- Install the upper and lower manifold.