MatraSport Forum
General Matra related => Marketplace => Topic started by: Oskar on December 28, 2007, 02:15:34 pm
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is has been repaired at exaustvalve 2 and reinforced.
now it has a small crack at exaustvalve 3... I know the cooling is a joke in this head and not to mention the headgaskets waterholes...
it has all 8 valves, nothing else
located in Lund
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You can demount the valves and throw it into the bin :(
My one and last experience with repaired cyl.head on my old silver Murena was bad bad bad and means only next new cyl.head gasket, 4 ltrs of new oil and a lot of work :( Sorry but repaired head could bring more problems than somebody can imagine.
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ok
I save the head for the looks and keep the valves :)
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I think Hans has positive experience having a cracked head repaired? There's probably two factors determining the success or failure: (1) The competence of the welder, and (2) the nature of the crack. Since this has cracked once and is now cracked again, I don't think it's worth much.
I have a spare head which has suffered from corrosion, not cracking, and I think it can be repaired if I need it.
- Anders
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No I have had bad expirience with repair. The rapair as such was done OK, but the repair shop did not repair all cracks, so my money was wasted.
Hans
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The competence of the welder...
- Anders
Good point Anders, because of big temperature differences during the welding, there are changes in material structure and the result is that after few kms (7000 in my case) it's broken again. Good welder will warm up the head before welding but after welding the cooling must be controled and very slowly. And welding like this is as expensive as another (used but good) cyl.head.
Murena has very similar head as Tagora and it is the same as on Chrysler 180 (there are "hundreds" of used Chrysler heads here in CZ) but unfortunately Murena has special 3-point holder on exhaust side and nobody still found the way how to supply this.
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The competence of the welder...
- Anders
Good point Anders, because of big temperature differences during the welding, there are changes in material structure and the result is that after few kms (7000 in my case) it's broken again. Good welder will warm up the head before welding but after welding the cooling must be controled and very slowly. And welding like this is as expensive as another (used but good) cyl.head.
Murena has very similar head as Tagora and it is the same as on Chrysler 180 (there are "hundreds" of used Chrysler heads here in CZ) but unfortunately Murena has special 3-point holder on exhaust side and nobody still found the way how to supply this.
Nice info, I don't know much about welding ;)
It appears that there are some Tagora heads available with have the three studs (though no threads), they look like this:
(http://www.espace-murena.com/Images/Articles/MoteurTagora/culass2.jpg)
The photo is from www.Espace-Murena.com: http://www.espace-murena.com/articles.html (http://www.espace-murena.com/articles.html)
(click 'Moteur Tagora 2L2' on the left)
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I'm on my cottage, and Murena is in garage in Prague, so I can't go to control it, but think that this (yellow) point is unuseable:
(http://sweb.cz/michaltalbot/culass2j.jpg)
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As far as I can read the french on the page ;) they adjust the hole and extend it to an M10. I'm not sure, but it may be angled incorrectly. But it should be ok. According to the article, at least ;)
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Aha! I haven't read it before but now I did, and it seems like newer heads could be used! On the flywheel side of older Murena/Tagora heads there is cap for camshaft and it is fitted with 3 screws, but newer ones (which were also used at Peugeot) have this cap fitted with 5 screws! I think that maybe just these heads are those which could be used also for Murena!
