liner height 6nz c15

I just went through this myself, and you probably don't want to hear this, but the only accurate way to measure it is with a new spacer gasket and the spacer on, clamped down with short bolts in place of the head bolts with steel washers on top of fiber washer (available at Cat). The best I understand it, this is to make sure that the liners are pushed down into the block like they will be with the head on, and to make up for any slight imperfections in the deck surface of the block. It is a pain, but it's the only sure-fire way to do it. You're going to need a new spacer gasket anyway, why not just go ahead and measure it the right way?

Having said all that-the spacer is .338" thick and the spacer gasket is about .007" thick once it's mashed down. So I think the numbers you're looking for are roughly .347 to .352. You really aren't going to be able to measure it accurately like that though.

 

That's what happened to me, mine blew between five and six, all of my liners were getting a little low but were within about .002 of each other. Cat makes a thinner spacer plate that's .335 thick, my machine shop told me I was better off buying it than hoping they could get my old one milled down right. I can get you the part# if you need it.

 

The thinner spacer plate is 138-9381 this plate is .003" thinner than the standard plate. The only way you can use this plate is if all the liners are within .002" adjacent to each other and the overall measurements from one end of the block to the other end, the projection is less than .003" with the standard plate. If you have one cylinder at .0035 and the two cylinders adjacent are .0025 when you install the thinner plate the measurements would raise the liner projection to .0065 with the two adjacent cylinders being .0055. You'd be taking a risk of cracking the liner flange on the .0065 cylinder at a later time even though it's within the .002" spec of the liners next to it.

The reason you're taking this risk is the liner is above the max of .006". To have a high liner projection means that the head is exerting more downward pressure on the flange/linner this shears the flange off the top of the liner

 

Your math is correct

You have a major problem with this. Each liner is supposed to be measured in 4 locations around the circumference of the liner while it is torqued down with the spacer plate and gasket. You aren't taking into account the difference from one liner to the next to it and so on. Have you inspected the block deck surface under each liner flange? Do any of them show signs of fretting? Can you still see the original machined surface and machine markings of the block deck where the liners sit? If the answer is no to the first and last questions, and yes to the second question, you're asking for another head gasket failure. Without taking the liner projections of each cylinder and averaging them and comparing them from one to the next and the overall difference for all the cylinders, you can have a head gasket failure

 

If you didn't do it the way it was described in another post, what you did was really pointless.

You have to pull the liners to check the mill marks. If you pull them you have to replace the 3 o-rings and the seal.