View Full Version : 1904 International cylinder head part 2

bob ward
04-11-2010, 11:28 AM
Once I knew I had a good surface I could bolt the head to the rotary table and centre it. I need to be able to just skim the edge of the raised section with my cutter.

There was .010" difference from high to low on the mating surface, so I went around and took that 10 thou off first, then another 10 thou, and then another and called it done. The mating face is not perfect but it is way better than it was and should be adequate for duty.

Next comes the real tricky part, milling the bits under the hold down nuts. I clamped the head best I could, released one hold own at at a time and milled the little patches.

I thought the head would move at this stage and it did, so I just went down with the cutter a little at a time until it feathered in. More like carpentry in steel than proper machine work, but it actually worked quite well. It looks a lot worse in the photo than it really is.

The head has gone back on and the head gasket no longer leaks water, which is good. The cylinder head saga is not quite over yet, unbeknowns there were 2 problems, the second one being a crack from the water jacket to the inlet tract. I'm not going to volunteer for that one.

The Fixer
04-11-2010, 11:39 AM
that crack is prolly not that hard to fix..... installing small say 1/4" or so tapered plugs (1/16" pipe plug?) overlapping each other along the crack is a common method used for repairing cracked cyl heads. In your application it could even be done across the valve seat area which is then reground.


Don Young
04-11-2010, 11:38 PM
Bar's Leaks or a similar product should easily solve the crack problem. Of course there are lots of other alternatives: welding, brazing, stitching, perhaps even epoxy. It depends on accessibility, available skills, and risk judgements.

04-12-2010, 07:58 PM
I would have held the head to the table thru the valve guide holes.
Just my idea.


04-12-2010, 08:00 PM
Looks good to me,the crack since it's on intake,just vee and braze would be my pick.