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.
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.
replace the hydraulic tappets in the rocker arms, valves are non adjustable.
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)
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.
yes you do have to set the tappets