Science and Energy wrote:
Hello,
I will be replacing the cylinder head (new) and head gasket on my 05 CRD.
What thickness should I get? My guess, the same thickness stamped on the existing one?
Is the stamping visible before the motor is taken apart?
Is there harm in putting the thicker one on? (my guess is yes)
The timing belt, pump, rockers, and lifters were recently done recently. Any other items I should consider replacing while I am in that deep? Turbo seems fine.
Which gasket required strictly depends on the protrusion of the cylinder liner and the piston. The engine is measured on the assembly line for this tolerance.
Based on this, go back with what it came with from the factory since you have not done any liner or piston work.
From the FSM: wrote:
Piston protrusion must be measured to determine cylinder head gasket thickness if one or more cylinder liners have been replaced.
NOTE: If cylinder liner(s) have not been removed, the same thickness head gasket that was removed can be used.
0 holes = 1.32mm
1 hole = 1.42mm
2 holes = 1.52mm
Some simply advocate using a universal two hole thickness for all applications regardless of whatever engine work was performed. But I am of the strong opinion that if the engineers and designers of this engine designed it that way, they would have so stated in the Factory Service Manual. Instead, they went to great lengths and detail to cover the hows and whys in the FSM on the procedure to measure piston liner and piston protrusion to determine the correct head gasket thickness. Will a two hole thickness gasket work for all applications, probably since it has be done by some. Is it the best choice, not always if the head has not been milled in my opinion.
I'm an old mechanic and automotive machinist and I believe in going by the book.
End the end, it is your engine and an owner can make his own choices as to what to use or not.
_________________
Supporting Vendor and Moderator of LOST05 Jeep Liberty CRD Limited
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