I recently posted about the glowplug having stucked (broken) in another thread and the only way to remove it is to lift the cylinder head, Im planning to have it done because I'm having a hard time starting from cold start (in the morning) and after parking for an hour or more. I should start easy with 3 glow plugs. Check fuse and glow plug relay.

What should a trusted mechanic do aside from removing the broken glow plug and optional parts or a must parts to be replaced so as to make the procedure worth it? Replace head gasket, and timing belt if due.

I don't have any problem with the engine aside from its hard starting when its cold, a bit shaky when it starts, probably because it lacks the heating requirement. This could also be due to a faulty injection pump.

My engine is 4d56, adventure. Can you give me an idea how much will it cost. Thanks in advance.