This is a step by step guide on how to find, remove, repair, and refit noisy valve lifters in your Isuzu 6VD1 engine.
The first picture explains a good way to figure out which side the noisy lifter is coming from, by using a stethoscope.
The second picture is showing how the excessive clearence in between the valve and the valve stem itself cause's the ticking sound you hear. Of course you will need to remove the rocker cover to get to the vavle assembly.
The 3rd picture shows the wear on the face of the lifter or lash adjuster once you have pulled it out, and once again you will need to remove the valve train to do this. Just mark with a white marker the valves with the excessive clearence before you pull the valve assembly off.
The 4th picture is showing how to remove the valve lash adjuster from the rocker itself. As it says in the pic. be sure not to damage the O-ring as you remove it.
The 5th picture is showing how to depress the check ball in the lash adjuster once it is remove so that the excess oil can be removed from it prior to cleaning and inspecting it.
The 6th picture is showing that carburettor cleaner is sprayed on the lash adjuster, but make sure that the oring is carefully removed first. Then check for wear and tarnishing after cleaning.
The 7th picture is showing the adjuster fully submerged in a cleaning solution like Calite to thoroughly clean it and while it is submerged, working the check ball in and out to get it really clean.
Now once this has been done then soak the lash adjuster in engine oil and work the check ball to get the oil into the valve body.
Refit the o-ring and then refit back into the rocker.
Reassemble the rocker and valve assembly to the head and make valve clearence adjustments.
The last picture shows the refitting of the rocker cover with new gaskets and sealant being used, you don't want to have to remove it because its leaking.
Well I hope that this quick overveiw of repairing those noisy and rattly lifters will be of great use and also save you a bit of money.
Happy motoring everyone.