200 Tdi Head Gasket, Can the head be milled? - Defender Source
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  #1  
Old October 4th, 2015, 06:09 PM
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200 Tdi Head Gasket, Can the head be milled?

I Need to have the head gasket done, can the head be milled if need be or is to better to source a reman? Anyone have experience with ACR: Land Rover Cylinder Heads - ACR - Automotive Component Remanufacturing Ltd Or know of a reputable supplier stateside?
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  #2  
Old October 4th, 2015, 07:05 PM
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Have a read of the manual. IIRC it allows a small skim.

They are like hens teeth to find as they die when overheated and new ones have not been available for many years.

What is happening with it? Why do you think it will need a skim?
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Old October 4th, 2015, 07:34 PM
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It's been done twice, 4 years ago, Shop replaced it and it leaked oil at the gasket, took it back they re-did it with a number 3 AND some sort of goop, real professional like and it still had a bit of a weep. It is now blowing coolant out of the expansion tank which looks like a frothy bubbly cauldron when peering in. I assume it's warped, pitted or something or maybe the original repair was more botched than I thought.
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  #4  
Old October 4th, 2015, 07:41 PM
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Ahh. You need to have a look then. Like I say. Very hard to source. Some people have converted to a 300tdi head but there is a bit involved.
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Old October 4th, 2015, 08:15 PM
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Hopefully there is enough meat left if it needs to be skimmed.
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Old October 4th, 2015, 08:48 PM
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I looked through the workshop supplement and book 2, I can't find the spec for skimming depth, Anyone know off the top o' the noggin where to find that? Found on the web .020" max, must be true??
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Old October 4th, 2015, 08:52 PM
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Have you thought about getting the head flame sprayed before being reskimmed?
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Old October 4th, 2015, 09:14 PM
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Quote:
Originally Posted by sonoronos View Post
Have you thought about getting the head flame sprayed before being reskimmed?
No, never heard of it. What is the process, who does it and why?
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Old October 4th, 2015, 10:49 PM
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The purposes of flame spraying are manifold, but in your case, it can be used to restore material to a block or head that have been machined too small.

Thermal Spray Coating & Non-Stick Industrial Finish Services - Saint Paul, Minnesota
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Old October 4th, 2015, 10:51 PM
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I would not attempt flame spray or welding on a cast aluminum head.

The head needs to come off and inspect it. Typically they crack and then are scrap.
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Old October 4th, 2015, 11:05 PM
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Red,
What are the issues with either route? I'll be working with my mechanic on it and he suggested sending it out for welding material in then polishing flat any low/pitted areas.

Sonoronos, have you tried flame spray?
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Old October 4th, 2015, 11:10 PM
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Their website states they can flame spray aluminum. If you need to add thickness at least you have an option if the head isn't cracked.
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Old October 4th, 2015, 11:11 PM
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If I can get an ACR or similar refurb, I'm going that route, just looking for contingency plans.

------ Follow up post added October 4th, 2015 11:13 PM ------

Quote:
Originally Posted by javelinadave View Post
Their website states they can flame spray aluminum. If you need to add thickness at least you have an option if the head isn't cracked.
I saw that, seems like a possibility but would like to talk to them regarding this application.
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Old October 4th, 2015, 11:18 PM
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It messes up the metallurgy of the casting. Doing it properly would cost many times more than a replacement head. Everyone I know that has had a head welded has had it fail at the weld.
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  #15  
Old October 4th, 2015, 11:31 PM
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Spray transfer metal isn't adding a bunch of heat to a specific area like if you were welding a crack or two pieces of metal together. There isn't a "root" being fused. The heat is spread over the entire surface and then it is machined flat. If I needed to add thickness I would hesitate to use this method.

https://en.wikipedia.org/wiki/Thermal_spraying
http://www.cntrline.com/knowledge-do...lioArticle.pdf
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Old October 4th, 2015, 11:45 PM
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Quote:
Originally Posted by Red90 View Post
It messes up the metallurgy of the casting. Doing it properly would cost many times more than a replacement head. Everyone I know that has had a head welded has had it fail at the weld.

Same situation for flame spray?

Thanks for the input all, appreciated.
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  #17  
Old October 5th, 2015, 08:54 AM
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Quote:
Originally Posted by javelinadave View Post
Spray transfer metal isn't adding a bunch of heat to a specific area like if you were welding a crack or two pieces of metal together. There isn't a "root" being fused. The heat is spread over the entire surface and then it is machined flat. If I needed to add thickness I would hesitate to use this method.

https://en.wikipedia.org/wiki/Thermal_spraying
http://www.cntrline.com/knowledge-do...lioArticle.pdf
Yes, good point hadn't seen this before my last post. Thanks for the links. ACR, Rimmer bros. have nothing available, no surprise there I guess. Hope I don't find anything terminal when we pop it.
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  #18  
Old October 5th, 2015, 09:26 AM
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The flame spraying approach would be a last ditch, IMHO. You would have to find somebody who is willing to do it properly.

So I want to make it clear - the only reason I even suggested flame spray was only in response to this statement by the OP:

Quote:
I assume it's warped, pitted or something or maybe the original repair was more botched than I thought
In other words - pitting and warping. The person doing the job would have to know exactly what the required surface height of the cylinder head is.

If, like Red says, the head is cracked, then there's no way flame spray is helping with that.
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