valves need adjusting,.030mm or .12
the valves need readjusting
Most likely a rattle from that area in the engine bay when cold that subsides somewhat when engine gets warm.
If its chain driven, Could be the timing chain tensioner! Does it also have a rattle driving the vehicle at around 2000 R.P.M?
Yes it sure will, but it can also be the valves need adjustment.
wrong viscosity oil, bad oil pump, bad hydraulic lifters,or loose tappet rockers
Water hammering on any quick closing valves
so will the wrong oil filter
Because of the induction accelerator. Make sure the spacing mounts are completely sealed. Ask the repair guy if there is spacing mount replacement valves since they connect to the accelerator under the transmission.
The valves are rattling because they are not adjusted properly. Now if you are referring to what is commonly called pinging, that is another thing altogether. You just had the head machined. If you mean you had the head plained down, then that increased the compression ratio of the engine. You may have to move up to a higher octane fuel to stop the pinging.
then i would seriously look at the timing belt for wear or belt tension. I guess you could have some really bad gas , too. Check your oil lately ?
faulty lifters at the best will rattle, at the worst they will not lift the valves properly . valves not opening and closing properly will greatly interfere with the proper running of the engine.can also cause a push rod to come loose and fall into the engine, breaking or bending other parts
From what I can tell, the rattle is most likely coming from your alternator, Take It In!