Note: When carrying out work, reinstall all heat shields.
Remove the top engine cover. Unscrew flue gas temperature sender 3 -C495- -pos. 2- with the tool from the 17 mm tool set -T10395- and a suitable socket. Unscrew screw -3-, release and press pipeline to one side. -Position 1- ignore.
Unlock catches -arrows-, unhook upper part of toothed belt guard -1- and press to the right. Remove nozzles.
Detach hose -1- for crankcase breather from cylinder head cover by pressing hose clips. Unclip vacuum hoses -arrows- at breather pipe. Loosen clamp -3-, detach air duct from mass air flow meter -G70-. Unscrew screw -2-, move air duct with intake manifold fitting back and disconnect from turbocharger.
For vehicles with engine code CLHA, CLHB, CKFB, CKFC, CRVC, CUPA
Open the heat shield -1-. Disconnect electrical connectors -3, 4, 5- and hang out wiring harness. Remove screw -2- and move bracket with differential pressure sender -C505- back.
For vehicles with engine code CRKB
Open the heat shield -1-. Unplug electrical connectors -3,5,6- and move wiring harness clear. Remove screw -2-. Disconnect connector -4-.
Disconnect vacuum hose -arrow- and lay to one side. Remove holder with differential pressure sensor and place back.
All
Disconnect vacuum hose -arrow-.
Loosen and unscrew the cylinder head cover bolts in the sequence Remove the cylinder head cover.
Installation
Installation in reverse order.
Note: Replace sealing ring. Replace the cylinder head cover gasket and cylinder head bolts if damaged or leaking.
Connect vacuum hose.