cts1950 wrote:
I understand the head gasket is a no hole which was the thickness of the original. I carefully measured the piston popup as outlined in the engine manual and came up with the proper measurement for a no hole or thin gasket. The head that I got had been surfaced but it still maintained the min spec in the service manual. This is a clip from the add in ID s web site. It appears that this is a new kit is possibly different from the ones you have used I can not say
ARP Head Stud Kit (Liberty CRD)
ARP
OEM Part Number: IDP4044
Manufacturer Number: IDP4044
** 2018 UPDATED DESIGN **
We updated this design to include 18 studs that are all the same length. We also use studs that are not undercut to increase strength.
Set of 18 ARP head studs, nuts and washers for the Jeep Liberty CRD.
This kit includes:
18 x ARP2000 studs that can fully bottom inside the block for easier installation, especially important with the higher torque inner bolts.
See, I got a set of equal length studs too, in May, but the 4-5 (can't remember, not that far into re assembly yet) are threaded further.. so they can be screwed into the block deeper. and the final 'stick out' will be proper height. Edit; There are 4 of the longer threaded studs.
I went and measured all the block holes. For all practical purposes, they are 1.53- 1.54 inch deep. This for 'usable' threads, not the tapered bottom.
My studs (regular length threads) won't come close to 'bottoming out'. They have just short of 1.100 inch of rolled threads.... so 'forcing' them in to a 1.5 inch deep hole, thinking they are bottoming out is not cool. Even adding in .250 depth of counter bore, it's still going to be just short of bottoming out (run out of threads) All you are doing is putting tension on the block deck by 'wedging' the stud's non threaded surface into the threaded part of the block. The holes are counter bored, so the tension probably won't be felt across the actual face of the deck.
My extended thread studs, come close to actually bottoming out... let me do the math:
These all measure 5.754 inch, (5 3/4 for practical purposes) The 'short' threads measure 1.1 inch, the 'long' threads measure 1.35 inch. Add in the counter bore of .250, for a total of 1.60 inch, and those would probably bottom out before the threads ran out.
So, I plan on running them down just so a little tension is felt, then 'hold' them from going any further when torqueing the nut.
Those 4 'special' studs go into the position where clearance in the cam area is needed.. So they'll get screwed into the block deeper in those places.