Mi16 Head Gasket

[eob 7]

Did an exhaustive search to no avail (surprised at that) but I'm just looking for the bolt tightening sequence and the torque/degrees to turn settings for an all-alloy Mi16 (D6C).

 

In particular I'm interested the Peugeot way (someone mentioned 300 degrees in one of the threads?) versus other peoples own methods (incrementally tightening it using torque settings).

[James_m 0]

There was a thread on this subject a few months back so dont give up! which had some good information.

I think the general concensus is that the Peugeot method is overkill, and a bit risky on 20 yr old aluminium blocks.

 

Personally, i torqued mine to 75ibs ft maybe a little less on threads that felt a bit fragile and ive had no problems.

I think the important part is that the head is flat, and the tightening sequence is adhered to.

[welshpug 1,657]

torque settings - http://i47.photobucket.com/albums/f169/wel...cs/PICT0013.jpg

 

tightening sequence - http://i47.photobucket.com/albums/f169/wel.../PICT0015-1.jpg

 

1.9 cam cover tightening sequence - http://i47.photobucket.com/albums/f169/wel.../PICT0016-1.jpg

 

there's also a special tightening sequence to the cam carriers

[eob 7]

You guys are not just men but the men. How your better halves sleep at night without being overcome with fear of losing you is beyond me. I'm, err, downloading a 405 manual (rhymes with 'James') in order to get the tightening sequence for the cam carriers as I just nipped those up by hand. Those pictures are really going to help but I'm still interesting in hearing how other people do the tightening sequence. I think you're right on the whole Mi16 overkill on tightening thing as I spotted that in a few threads. Someone was suggesting 75lb/ft per head bolt, then tighten to 101lb/ft?

[DamirGTI 342]

Im using this method , for both the 8v and 16v 1.9 engines :

 

1. stage - 30Nm

2. stage - 55Nm

3. stage - loosen each bolt 1/8th turn and re-tighten back to 55Nm

4. stage - 80Nm

5. stage - 95Nm (70lbf ft)

 

More info here :

http://forum.205gtidrivers.com/index.php?s...4&hl=torque

http://forum.205gtidrivers.com/index.php?s...323&hl=head

 

Rgs !

Damir

[eob 7]

Much appreciated Damir! I actually read your article on your tightening sequences elsewhere on the site and, after weighing up my options, even if the head isn't torqued enough, that means a failed HG which can be fixed. On the other hand, if I over tighten it (aka the Peugeot method) then it means helicoiling and all that hassle. I'd rather 'risk' a failed HG than helicoiling a 20 year old aluminium block.

 

Thanks man

[DamirGTI 342]

Don't worry , just spend some time cleaning/preparing the block surface and you'll be fine i've been using this method for some time now and didn't have any problems/blown gaskets yet and you can reuse all the head bolts afterwards you tight them this way cos they wont stretch , even my high CR engine on which i've been using this same tightening method still goes strong , and it really has quite high compression ratio which could blow the head gasket easily if theres any doubt in sealing strength ...

 

As said , take your time , don't rush spend some time in preparation first .. oh and this is very important - skim the head prior to refitting and check/measure the liner protrusion ..

 

Have fun !

Damir

Edited June 27, 2008 by DamirGTI

[eob 7]

Just tightened them up to 55nm for the first time. This is quite scary. Seems to be serious torque to put into some metal bolts that are going into twenty year old aluminium. Gonna leave them sit for the night at 55nm to settle and have another crack at it tomorrow. I'm going to go with 95nm as the final torque setting and then pray some. I'd feel better, too, if they didn't use the Torx heads on these and had proper hex heads instead.

 

Nerve wrecking stuff.

[j_turnell 137 3 Cars]

It always helps to use some copper grease on the bolts when doing them up.

[James_m 0]

Just tightened them up to 55nm for the first time. This is quite scary. Seems to be serious torque to put into some metal bolts that are going into twenty year old aluminium. Gonna leave them sit for the night at 55nm to settle and have another crack at it tomorrow. I'm going to go with 95nm as the final torque setting and then pray some. I'd feel better, too, if they didn't use the Torx heads on these and had proper hex heads instead.

 

Nerve wrecking stuff.

 

Tell me about it! I needed a lie down and a cold drink after i did mine up.

[eob 7]

For me, it just got that bit scarier:

http://forum.205gtidrivers.com/index.php?showtopic=92064