PDA

View Full Version : Cylinder sleeve protrusion



mallard
11-20-2009, 04:53 PM
Just got the crank back from the machine shop today so I'm going to try again to get the engine put back together. After a trial fit with the liners I found these numbers on the liner protrusion. Using the steel figure 8s I had 003-004. Using the copper I had 007-008. I understand the correct measurement should be 003-0055. I was wanting to use the copper F8s because I thought I might get a better seal because I have some minor pitting in the block. These measurement were taken with the sleeves held in place with some large washers on the studs with about 20lbs of torque on the nuts. All was dry also. I was thinking the copper F8s would compress some, but 0035 would be alot of compressing. Any idea how much the copper gaskets will compress with the head torqued down?

TR4nut
11-20-2009, 04:59 PM
I'm curious on this one too - I wonder if you have a old or sacrificial head gasket, can you just torque down the head to spec, then recheck deck height? If good, a fresh head gasket and your are ready to go. Someone will shoot that thought down I bet!

TR3driver
11-20-2009, 07:50 PM
My experience has been that the copper Fo8 gaskets will spring back to within .001" or so of their initial height.

My feeling is that you would probably be fine with .007-.008 & a stock composite gasket. It crushes a long way as you torque the head, and all you are risking is a little less clamping force against the block where it seals only oil & water.

However, you could probably work them down a bit if you want. Or I believe Mordy will make them for you in custom thicknesses.

mallard
11-20-2009, 09:34 PM
Randall would you consider a little sealant around the oil and water passages?

TR3driver
11-21-2009, 07:19 PM
would you consider a little sealant around the oil and water passages? Sure. Couldn't hurt, might help. Even the book recommends 'Wellseal', which seems to be slightly similar to Permatex Aviation. (I think TRF still sells genuine Wellseal if anyone is interested.)