You need to remove the head to do this . Then compress the spring and remove the keepers
It is on the side of the head, over the transmision.
Remove the head and have the valve reseated or replaced.
To remove a valve cover on a 1998 Suburban, you need to take all of the valve cover bolts out. Lift the cover slightly, then see what is in the way of sliding it out (hoses, fuel rail, etc..) Remove and items blocking the removal then lift the cover off. Make sure to clean the cover and head of all old gasket material before installing a new gasket and bolting the cover back on.
You'll need a valve spring compresser, compress the spring down, toward the head then remove the retainers and the valve should slip right out.
To remove the head on a Mercedes 312 Sprinter, first remove all components and accessories. Then remove valve covers and loosen the inboard center head bolt. Finally, remove the head.
There is one intake valve for each cylinder. It is located in the top of the head. If you remove the valve cover, you can see the stem of the valves by peeking through the caps in the valve spring. If you want to replace a valve, it will be necessary to first remove the cylinder head.
Remove, in this order: valve cover timing belt cams cam adjusting shims--MARK EACH with the valve it came from, something like "#1 left exhaust valve" head bolts head Then scrape off the old head gasket
The EGR valve is bolted to the rear cylinder head at the transaxle end
The EGR valve is bolted to the rear cylinder head at the transaxle end
Could be head gasket, head, or cracked block
valve spring compresser
2 screws, up/down. left/right