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1993 Mercury Grand Marquis Spark Plug Torque Spec

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  • friskyfrankie
    replied
    Guess they were being overly careful - maybe to prevent lawsuits?

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  • GM_Guy
    replied
    It is. reports of plugs loosening becuase they where not tight enough.

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  • friskyfrankie
    replied
    Seems the more recent spec (approximately 13 LB FT) is a little more appropriate than the original one of about 7.

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  • sly
    replied
    Since there was no change in the heads themselves 92-00, I'd go with the later specs myself and consider the original specs the absolute minimum. That's just me though.

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  • friskyfrankie
    replied
    Dug out the official manual and specs are as follows:

    9-12 N m or 6.6 -8.8 LB FT

    Seems a tad low but I guess they don't want the plugs "crucified" into the heads!

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  • sly
    replied
    Go with the 2000. That's the last NPI engine spec.

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  • friskyfrankie
    replied
    Originally posted by GM_Guy View Post
    And just for added fun, the low spec end of the spec got superceeded by a higher spec at some point.
    Makes you just want to ditch the entire "torque wrench thing" and let experience guide me!

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  • GM_Guy
    replied
    And just for added fun, the low spec end of the spec got superceeded by a higher spec at some point.

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  • friskyfrankie
    replied
    Your conversion is basically correct (14.75) but that is posted in more than one place in the manual (inside and on the back cover) so not really sure what the real deal is?

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  • friskyfrankie
    replied
    Originally posted by sly View Post
    9-20Nm doesn't match up to 6.6-7.3 lb-ft... that would be 6.6-15 lb-ft.
    Not certain of the conversion but I am only stated what it said. Misprint?

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  • sly
    replied
    9-20Nm doesn't match up to 6.6-7.3 lb-ft... that would be 6.6-15 lb-ft.

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  • friskyfrankie
    replied
    Just dug out the Official Ford Manual for this car and the spark plug torque is stated as 6.6.7.3 Lb-Ft (9-20 N.m). Not sure if they recommend anti-seize compound or not as I have yet to find it.

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  • friskyfrankie
    replied
    Still need to consult my manual to see if they say something different. Who knows?

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  • sly
    replied
    Yeah... kinda need an inch pound wrench for that.

    I think I still used 12-15 lb-ft on my 93 with the original engine. *shrugs*

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  • friskyfrankie
    replied
    So we're figuring about 7 ft/lb. Wondering if it even pays or just a slight tightening past snug (which I have done before)? Guess it all depends upon the accuracy of the torque wrench.

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