Is this head scrap?
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- J4BPX
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Is this head scrap?
Cleaning up a set of 79 heads just in case my the valve seats on my 75 heads are beyond salvage. The left hand cylinder head had quite a lot of calcium deposit under the gasket once I'd cleaned it off and a couple of the cooling channel holes were fairly blocked up. It was almost as if the PO had been using straight tap water in the heads. Where I cleaned off the calcium the heads are pitted and there is also some erosion around the edge of the valve depression. Is this acceptable or is this head scrap and / or could it be salvaged with a skim? Heads seem to be easily available in the US but not in the UK so I am just interested if it is worth saving.
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A little inaccuracy sometimes saves tons of explanation - Saki
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- MSGT-R
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Re: Is this head scrap?
Pin hole corrision is never good. I may be clear through to the water jacket.
The gasket surface must be clean and flat or it won't seal.
You can try a clean-up pass, but if a couple of thousandths won't do it, I would suggest to go find another head.
The gasket surface must be clean and flat or it won't seal.
You can try a clean-up pass, but if a couple of thousandths won't do it, I would suggest to go find another head.
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- Whiskerfish
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Re: Is this head scrap?
The ridge deterioration around the combustion chamber would be a concern. I would take a head gasket and lay it on there to evaluate how much impact that might have on the sealing surface of the gasket.
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"The book is wrong, this whole Conclusion is Fallacious" River Tam
2008 GL1800 IIIA "TH3DOG"
1975/6/7/8/9 Arthur Fulmer Dressed Road bike
1975 Naked Noisy and Nasty in town bike
and a whole garage full of possibilities!!
Psst. oh and by the way CHANGE YOUR BELTS!!!!
- backyardbob
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Re: Is this head scrap?
I had a similar condition on my 77, machined .007 off the surface and it worked out ok.
i finally made it past the junkyard dogs!!
- MSGT-R
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Re: Is this head scrap?
Use a thicker head gasket or a gasket shim if a lot comes off to keep the timing belts from having too much slack.
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- robin1731
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Re: Is this head scrap?
I wouldn't worry about that. The tensioners are there for that. But too much and you start getting in to valve to piston clearence issues.MSGT-R wrote:Use a thicker head gasket or a gasket shim if a lot comes off to keep the timing belts from having too much slack.
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and a rotation of various purchases
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1985 Honda Elite
1976 KZ900 Dragbike
1992 ZX7 Dragbike (KZ900 style motor w/NOS)
and a rotation of various purchases
Randakk approved Carb Rebuilder
- MSGT-R
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Re: Is this head scrap?
..and that's at least 10 thousandths or more.
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- J4BPX
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Re: Is this head scrap?
Sorry. I'm metric - is 10 thousandth equal to .254 mm?
A little inaccuracy sometimes saves tons of explanation - Saki
1976 UK GL1000 K1 'Trog' restored.
What's next?
The restoration at http://www.aeromount.com
1976 UK GL1000 K1 'Trog' restored.
What's next?
The restoration at http://www.aeromount.com
- ericheath
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Re: Is this head scrap?
Yup.
Whatever I suggest here should be given ample time for a moderator to delicately correct. I apologize in advance.
77 WING, 1200 engine with 77 heads, cams, gl1100 foot pegs, Magna V65 front end, 764A carbs, [-gone Suzuki M109 monoshock--, replaced with gl1100 shocks] gl 1200 swing arm, gl1500 final drive, wheel and rear brakes Valkyrie seat, Meanstreak tank, Sportster pipes, Power Arc ignition off crank.
77 Wing. black
83 Wing, in pieces
"Continuing education is important even if the subject matter is fairly useless (as in this case)."---Greg Foresi
77 WING, 1200 engine with 77 heads, cams, gl1100 foot pegs, Magna V65 front end, 764A carbs, [-gone Suzuki M109 monoshock--, replaced with gl1100 shocks] gl 1200 swing arm, gl1500 final drive, wheel and rear brakes Valkyrie seat, Meanstreak tank, Sportster pipes, Power Arc ignition off crank.
77 Wing. black
83 Wing, in pieces
"Continuing education is important even if the subject matter is fairly useless (as in this case)."---Greg Foresi
- MSGT-R
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Re: Is this head scrap?
Oops.. sorry about that.
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