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Old 06-12-2008, 06:01 PM
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need intake manifold bolt torq specs

have lower intake manifold to install on 4.2L block. Haynes manual states torque specs as step 1 at 44 in lbs and step 2 at 89 in lbs. When converting these to foot lbs as my torque wrench is ft lbs I get 4 ft lbs and 8 ft lbs- is this right? Any help on these figures would be great!
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Old 06-13-2008, 02:20 AM
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To convert foot pounds to inch pounds, multiply by 12.
To convert inch pounds to foot pounds, divide by 12.



You might want to invest in a 3/8 drive w/inch lbs. - 1/2" Drives in foot lbs aren't that accurate when dialed down that far - unless you have a real nice one.

Last edited by jbrew; 06-13-2008 at 02:24 AM.
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Old 06-13-2008, 10:57 AM
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the conversion is not the problem, rounding up of course gave me the 2 step #'s. The idea of only torqueing the manifold to 8 ft lbs when thinking of what goes on in the manifold just does not seem right. Going to Ford today and ask, thanks for the tip, also you can x in lbs by .083 to get ft lbs.
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Old 06-13-2008, 12:36 PM
glc glc is offline
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I believe that it's a plastic manifold?
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2003 F-150 XL RCSB 2wd 4.2 M5OD 3.55 LS
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  #5  
Old 06-14-2008, 01:49 PM
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Yea, and sits on those special O-Ring type gaskets that can't have any contamination before install - "Like oil" - You Clean the head w/mineral spirits before install, any oil contamination will cause NEW gaskets to leak.

The light torque numbers - Reason ? You can't smash the gasket or it won't work. It's suppose to compress and sort of stick to a dry aluminum head. My intakes a little different, it's aluminum and has 3 tightening stages to compress instead of just the two. This doesn't require much torque to accomplish.

Hope that's the answer OP was looking for - If you want I'll pull the procedure from the service DVD and email to you if you know the year of yor motor.

Last edited by jbrew; 06-14-2008 at 04:41 PM.
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Old 09-08-2008, 08:47 PM
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[QUOTE=If you want I'll pull the procedure from the service DVD and email to you if you know the year of yor motor.[/QUOTE]

JBrew,
Sent you a PM on this. Can you help me please? Going to be putting my new intake gaskets on tomorrow.
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Old 09-08-2008, 08:47 PM


 
 
 
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