Gentlemen:

I'm in the process of installing the cylinder head on my '91 350SD. The Mercedes cylinder head R&R procedure (01-415) indicates that a new O-ring should be used when installing the (fuel heater) pipe elbow into the cylinder head. How is the "pipe elbow" disassembled to change the O-ring? Does this thing just pull apart? I'm assuming that the O-ring that was included in the cylinder head gasket kit is the one I should be using.

Thanks in advance.

Greg