RD38eti cylinder head machining

[sm69]

Hi all. I am a mechanic by trade but havent done it for a few years. Bought a GU patrol with a faulty head or head gasket (new it had an issue) and am now in the process of fixing it. It looked like head gasket and took the head in to get it tested and machined if the test was OK as it was. When I got it back (apparently they had to do 2 or 3 runs to face it) the first valve has some taken off it. All the other valves look OK but this one is protruding approx .457mm. I have the thickest head gasket but to me this looks like it will be an issue. I have attached some photos which I hope show it better. The photo showing the ruler on the face (checked the ruler on the block and it was flat) shows the area i took the reading (approx 140mm point.
Your thoughts apprciated.

RD28Head2.jpgRD28head1.jpg

[mudnut]

Hi all. I am a mechanic by trade but havent done it for a few years. Bought a GU patrol with a faulty head or head gasket (new it had an issue) and am now in the process of fixing it. It looked like head gasket and took the head in to get it tested and machined if the test was OK as it was. When I got it back (apparently they had to do 2 or 3 runs to face it) the first valve has some taken off it. All the other valves look OK but this one is protruding approx .457mm. I have the thickest head gasket but to me this looks like it will be an issue. I have attached some photos which I hope show it better. The photo showing the ruler on the face (checked the ruler on the block and it was flat) shows the area i took the reading (approx 140mm point.
Your thoughts apprciated.

RD28Head2.jpgRD28head1.jpg

Welcome to the forum. Pop that valve out and check the seat. It may have moved due to cracking or overheating. If that's ok compare that valve another one, to see if they are the same.

I had an RB30 head machined recently, and found the timing belt tensioner was nearly out of spec. The fix for that is to machine a bit of tube to be an interference fit. Cool the tensioner, heat the machined tube and fit it. This takes up the extra slack from the timing belt.