timing for M278

Hey, I have a 2014 GL450 with a CEL and code P001685. I intend to retime the engine and have some questions. That is where I am at. Do I need to remove the heads to replace the chain guides? I ordered a timing kit and it included, among other things, only the black plastic guides and open chains. The metal guides were not included. So is the procedure for that those parts to cut... timing for M278

Hey,

I have a 2014 GL450 with a CEL and code P001685. I intend to retime the engine and have some questions.

That is where I am at.

Do I need to remove the heads to replace the chain guides?

I ordered a timing kit and it included, among other things, only the black plastic guides and open chains. The metal guides were not included. So is the procedure for that those parts to cut...

timing for M278

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