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Ranga: According to JustCommodores.com: "Hydraulic cam followers are self adjusting. No provision is provided nor is it necessary to adjust. They are a 'throw away' item, like everything else these days!
The tappets will be hydraulic so there is no adjustment there . The chain will not make a tappet noise but will be a rattle that gets worse with the rpm's( High klm's motor) . I suspect that what you may be hearing is detonation which occurs at low speeds under acceleration or at any speeds under sudden acceleration. IT is caused by spontaneous combustion in the cylinders ( not spark timing related) and is from normally a wrong air/fuel mixture form a wrong setting from the ECM . IT can be from faulty O2 sensors, injectors . fuel pressure , air filter MAF/MAP sensors Have the fault codes read first to check for any sensor problems Sometimes all it takes is to upgrade the octane rating of the fuel use (no E fuels)
look for obvious signs that the holden dealer did take off rocker covers and check/replaced shims for tappet adjustment you should have shims booked out on receipt if any were done. Alot of them dont do it because its very time consuming and a pain in the **** to do this job. This should have been done at 100,000km service. If the tapping noise is there constantly at idle and approx 1200-1500rpm and gets louder if you stab the throttle at this engine speed its a tappet or other engine noise(big end bearing), if the noise comes in and out at a constant engine speed idle and 1200-1500rpm your valve guides are worn. both of these were common for this engine.
Hello! I presume from your brief description the ticking/clocking noise goes after a few seconds? if so I wouldn't be at all worried, your Hydraulic lifters are doing there job filling themselves with oil again and getting to work.
If However they are making a clicking/tappety type noise all the time then there is an additive you can purchase specifically designed to assist Hydraulic Lifters of which I would add after a Quality Oil and Oil filter change.
Hope This FixYa's Problem!
Sounds like worn lifter/cam lobe,quite normal when engine gets a few mles on it.Lifter is finding it hard to fill the extra clearance created by wear.What sort of oil are you using and is it clean?Wear in an engine will lower your overall oil pressure as well,not generaly enough to worry about but it does contribute to the problem.At idle or when cold is generaly when this happens?