The hydraulic lifters do not require adjustment nearly as often as solid lifters.
no unless you change the size of the rods
yes
Doesn't the transit use a tdci with hydraulic tappets?
From the service manual pg 7-1:The engine uses hydraulic tappets that eliminate manual valve adjustments. The hydraulic tappets have de-foaming chambers. Before assembling, fill the chambers with clean engine oil.
replace the hydraulic tappets in the rocker arms, valves are non adjustable.
Normally loose tappets will cause a ticking sound in the engine. Depending on if you have mechanical or hydraulic tappets you may need to have them replaced or simply adjusted.
GET SOME NEW LIFTERS
The Opel Corsa Utility 1.4 2008 Model does not have Tappets but Hydraulic Lifters.
All 1995 engine variants have hydraulic tappets, removing any need for (or even possibility of) valve clearance adjustment.
try an engine flush at the next oil change, but it will most probably require replacement hydraulic lifters (tappets)
Noisy tappets on the Rover 75 1800 petrol engine typically indicate a need for adjustment or maintenance rather than a simple reset. These hydraulic tappets can become noisy due to wear, low oil pressure, or dirt buildup. It’s advisable to check the oil level and quality first, and if the noise persists, a more thorough inspection or replacement of the tappets may be necessary. Regular maintenance can help prevent this issue from recurring.
The main reasons that an accumulator is used in a hydraulic system are so that the pump doesn't need to be so large to cope with extremes of demand, so that the supply circuit can respond more quickly to any temporary demand and to smooth pulsations.