MtnClimber wrote:
Yes I’ve been debating ordering the exhaust valves while it’s torn down that far. Figured I would wait to see what shape the rockers are in first and then decide if I’m going to do the ‘Full Monty’ as I’ll need to figure out which head gasket to order so I’ll just order the valves then.
That's a very good move! Always better safe than sorry later down the road.
As to the head gasket, some push just using the two hole gasket in all replacement applications.
I am certainly NOT an advocate of that theory, if you read and study the Factory Service Manual, it lays out in great detail how the original head gasket thickness was determined based on several very close tolerance measurements between the top of the piston protrusion in relation to the head and the clamping force on the piston liners exerted by the head. Can you get away with a "one size fits all" approach, probably as it has been done many times by some, is it the best practice, certainly not in my opinion. I'm an older experienced mechanic who has worked on all kinds of vehicles for the past 50+ years or so including working in an automotive machine for several years.
As for me, I vehemently believe the engineers who designed this engine and wrote the Factory Service Manual were a lot more knowledgeable on its requirements than a few wrench turners who claim they know more than the engineers who originally designed and built this very unique engine.
If I were changing the head gasket and there is NO machining or shaving of the head involved, I would go back with the same thickness head gasket that comes off the engine, i.e. no hole, one, two, or three hole. There is a reason for having different size head gaskets as outlined in the manual.....
If you go to this site:>
http://www.colorado4wheel.com/manuals/Jeep/KJ/you can pull up the factory service manual online for either an 05 or 06 and read all about how the correct head gasket thickness is determined based on precise measurements. See Section 9, 2.8L COMMON RAIL DIESEL ENGINE, then read: STANDARD PROCEDURE - MEASURING PISTON PROTRUSION.
But as always, it's your engine, make your own choices based on facts....
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Supporting Vendor and Moderator of LOST05 Jeep Liberty CRD Limited
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