Ferrari Mailing List: Re: Steel plugs in aluminum heads

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On Nov 16, 2015, at 3:45 AM, Peter Rychel <dino308gt4 [at] hotmail.com> wrote:

 

Okay, so once the plugs are out, what should they be tightened to when put back in?

Ferrari's recommendation for the 308 is at 2 KgM (roughly translates to 14.5 lb-ft or 19.6 Nm). It "feels" about right for an aluminum head. Just as good for the Maserati?

As much as I'm a proponent for anti-seize, I DON'T like using it on spark plugs, because as the carrier evaporates and gets consumed but the engine, you're left behind with micro particles of metal that can fall into the combustion chamber. I've always used a drop of engine oil on the threads (and back off every so slightly on the rec'd torque values as oil tends to ramp up those amounts)...

Peter

---

From: Ferrari <ferrari-bounces+dino308gt4=hotmail.com [at] ferrarilist.com> on behalf of John Ashburne via Ferrari <ferrari [at] ferrarilist.com>
Sent: November 15, 2015 7:01 PM
To: PeterGT4
Cc: The FerrariList
Subject: Re: [Ferrari] Steel plugs in aluminum heads

 

I am taking notes on all of this. Never stop learning!

Good luck, Rick!

John

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On Nov 15, 2015, at 9:57 PM, "Doug & Terri" <dnt [at] dock.net> wrote:

Oh – and try tightening them a bit – just a tug, then try extracting.

DOUG

 

From: Ferrari [mailto:ferrari-bounces+dnt=dock.net [at] ferrarilist.com] On Behalf Of Richard Lindsay
Sent: Sunday, November 15, 2015 2:18 PM
To: DOUG <dnt [at] dock.net>
Cc: The FerrariList <ferrari [at] ferrarilist.com>
Subject: [Ferrari] Steel plugs in aluminum heads

 

Hi Friends,

I need to change the spark plugs in my old Maserati. They are really tight, and may not gave been changed in 20 years! I have not forced them free for fear of thread damage.

What tricks do you guys use to avoid thread damage? Can penetrating oil get past the crush washers? Would it be better to remove the plugs with a hot engine? Should I just avoid the problem all together?

Advice please?

-rick

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