Welcome to Justanswer ! my name is XXXXX XXXXX i will do my best to assist you with this problem
the cylinder head must be removed to replace the head gasket
to replace the head gasket is a 19.0 hour job to do even for a skilled technician to do
have you ever done a head gasket and timing chain before ?
im am just asking as I do not know your skill level
No I have not done it before.
I really feel this job should be done by a shop that has done this before im sorry to say
im not doubting your skill level at all just with the timing chain alignment and have not done a head gasket before I feel you may get in too deep with this project
this is the procedure here
CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
NOTICE: Be careful not to drop anything inside the timing chain cover.
CAUTION: Cover the paths with a shop rag to avoid oil splashes.HINT: Depending on the air pressure, the camshaft timing gear will turn to the advance angle side without applying force by hand. Also, under the condition that the pressure can hardly be applied because of air leakage from the port, there may be the case that the lock pin can hardly be released.
Do you ever remove the chain cover?