N9T head for sale (small crack)

Oskar · December 28, 2007, 01:15:34 PM

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

michaltalbot · December 29, 2007, 09:18:48 PM

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.

Oskar · December 30, 2007, 12:29:06 PM

ok
I save the head for the looks and keep the valves

Anders Dinsen · December 30, 2007, 10:45:03 PM

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

Matra_Hans · December 30, 2007, 10:55:09 PM

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

michaltalbot · December 31, 2007, 11:08:51 AM

Quote from: Anders Dinsen on December 30, 2007, 10:45:03 PM
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.

Anders Dinsen · January 01, 2008, 07:28:56 AM

Quote from: michaltalbot on December 31, 2007, 11:08:51 AM
Quote from: Anders Dinsen on December 30, 2007, 10:45:03 PM
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:

The photo is from www.Espace-Murena.com: http://www.espace-murena.com/articles.html
(click 'Moteur Tagora 2L2' on the left)

michaltalbot · January 01, 2008, 09:33:55 AM

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:

Anders Dinsen · January 01, 2008, 10:27:44 AM

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

michaltalbot · January 01, 2008, 12:42:58 PM

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!