Author Topic: Refitting cyl head  (Read 2436 times)

MATT BLACK

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Refitting cyl head
« on: 16:52, Tue 23 November 2010 »
20Nm + 90deg  ( + or - 4deg )

Anyone use any different tolerance settings or do you just go with the standard settings ?

Matt

markey mark (bd)

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Re: Refitting cyl head
« Reply #1 on: 17:03, Tue 23 November 2010 »
Which bolts you using mate?
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MATT BLACK

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Re: Refitting cyl head
« Reply #2 on: 17:13, Tue 23 November 2010 »
Standard Renault ones i took out. Engine is bog standard.

Ash-Lee

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Re: Refitting cyl head
« Reply #3 on: 18:24, Tue 23 November 2010 »
I'm not aware of the angle-tightening method, is this how Renault originally intended?

General rule has been 60Nm for 'normal' bolts, 80Nm for the hi-tensile bolts.

markey mark (bd)

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Re: Refitting cyl head
« Reply #4 on: 18:56, Tue 23 November 2010 »
Quote from: "MATT BLACK"
Standard Renault ones i took out. Engine is bog standard.

As Ash says, 60NM for standard head bolts.

I normally just nip them up then go round them in sequence and do them up to torque setting.
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andybond

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Re: Refitting cyl head
« Reply #5 on: 19:17, Tue 23 November 2010 »
Is it not wise to change the bolts due to potential stretching ?

markey mark (bd)

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Re: Refitting cyl head
« Reply #6 on: 19:38, Tue 23 November 2010 »
I would with standard bolts, the stronger 12.9 ones you can get away with using them a couple of times as there not really automotive stretch bolts.
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5-Mission

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Re: Refitting cyl head
« Reply #7 on: 20:44, Tue 23 November 2010 »
Apparently head bolts should be changed every time they are removed due to the stretching issue although they probably won't be permanently stretched if they were tightened correctly. I need to get hold of an angle gauge and tighten a further 120 degrees on my engine. Can't remember the current torque setting, think it's 60nm.. probably totally different on a C1J anyway

Ash-Lee

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Re: Refitting cyl head
« Reply #8 on: 21:19, Tue 23 November 2010 »
Quote from: "5-Mission"
Apparently head bolts should be changed every time they are removed due to the stretching issue although they probably won't be permanently stretched if they were tightened correctly. I need to get hold of an angle gauge and tighten a further 120 degrees on my engine. Can't remember the current torque setting, think it's 60nm.. probably totally different on a C1J anyway

Not ALL headbolts are stretch type.

Here is a link if your as bored as me.  :?

http://www.aa1car.com/library/torque_to ... t_tips.htm

5-Mission

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Re: Refitting cyl head
« Reply #9 on: 21:52, Tue 23 November 2010 »
Quote from: "Ash-Lee"
Not ALL headbolts are stretch type.

Here is a link if your as bored as me.  :?

http://www.aa1car.com/library/torque_to ... t_tips.htm
I'm not that bored Ash! :lol:  I thought they all stretched tbh. Shows what I know. Must be hardcore high tensile ones the ones you're talking about!

MATT BLACK

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Re: Refitting cyl head
« Reply #10 on: 01:05, Wed 24 November 2010 »
According to Renault ( tech note from Dialogys ) the correct tension is 20Nm  + 90deg ( + or - 4deg ).

Quote....."The standard bolts aren't stretch bolts and you can re-use them several times. If you over tighten the bolts it can shorten the life of the head gasket".

This is info direct from Renault ( will provide tech sheet in morning ) but to me 20Nm doesn't seem that tight even after you've nipped them up.

Anyway - Just finished fitting the head and Im off to bed ( 1.04am & -5 deg outside )


hardcore us 5 lads  :D

fishead

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Re: Refitting cyl head
« Reply #11 on: 10:32, Wed 24 November 2010 »
20 is only the pre tightening youve got another 90' to go on top of that

mr haynes recons 90' equates to 60nm, i dont recon hes to far out
i tested one of the angular therorys out an it was aprox 3nm out, assuming my angle gauge readings were 100% good, which i bet they wernt

MATT BLACK

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Re: Refitting cyl head
« Reply #12 on: 12:35, Wed 24 November 2010 »
You took the words out of my mouth. I ran them up to 20Nm and let them settle for 10 minutes then turned them 90 degrees on the 2nd tightening which measured 60Nm on the torque wrench.

The 2nd tightening angle of 90 deg allows for a 4 degree allowance either way ( 86 deg or 94deg ) hence the - / + 4 instructions.

Setting tappets at 15 inlet and 20 exh.