Loose Plugs (Again)!

4598 Views 3 Replies 3 Participants Last post by cruze01, Sep 18, 2017

cruze01

Discussion Starter · Sep 17, 2017

I know this has been mentioned before but it's worth saying again, if you haven't checked your spark plugs for a while I recommend you go do it now! I just checked mine because I realized I had set them wrong the last time. It's been about 30K and all four of them were loose as could be! I mean finger loose! When I changed them before I torqued all four to 20flb. I think GM should put this in the manual as a routine maintenance item......

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jblackburn

· #2 · Sep 18, 2017

Never had mine come loose, but then I never used a torque wrench either. Hand tight + a little bit more by a wrench (nowhere near enough to strip) has always worked for me.

Keep in mind that the crush washer on plugs crushes - once - to seal. After that, you'll probably need a bit more torque to keep them snug in the head.

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obermd

· #3 · Sep 18, 2017

Once you pull them out and then put them back in they're more likely to come loose. The crush washer is what keeps them snug on the first installation.

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cruze01

Discussion Starter · #4 · Sep 18, 2017

jblackburn said:
Never had mine come loose, but then I never used a torque wrench either. Hand tight + a little bit more by a wrench (nowhere near enough to strip) has always worked for me.

Keep in mind that the crush washer on plugs crushes - once - to seal. After that, you'll probably need a bit more torque to keep them snug in the head.

This set was new when I put them in 30k ago, the originals were loose when I went to take them out. I did give a little extra this time, 20 on the torque wrench and an extra push!

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