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General Category >> Rubber Side Down! >> Spark Plug Gets Loose
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Message started by Savageman on 06/17/17 at 14:42:18

Title: Spark Plug Gets Loose
Post by Savageman on 06/17/17 at 14:42:18

I have seen this issue on several Savage's. When I change the spark plug the old one is very loose almost finger tight in some cases. Of course it lowers the compression and power band.
Any usable ideas or comments for a fix? I don't want to over torque the plug or use loctite on it. :o

Title: Re: Spark Plug Gets Loose
Post by justin_o_guy2 on 06/17/17 at 15:07:46

You're not leaking anything out around all those threads unless you can see the plug is backing out. The gaps on the ring ends are huge in their areas that allow gasses to pass compared to the threads. If you have to use a tool to spin the plug the threads are pulled into contact with each other.

I've seen two stroke model plane motors that ran harder and faster than others that showed a crescent of light around the piston. The power pulse creates a strong but very short high pressure event.

Title: Re: Spark Plug Gets Loose
Post by Savageman on 06/17/17 at 15:22:52

The spark plug is for 2 purposes. One to create a spark for ignition and 2 to seal the combustion chamber so it will build and sustain compression for the the big bang. If it's leaking then it won't allow as big of a bang period.

So why the hell do the plugs get loose and how do you keep them tight?

Title: Re: Spark Plug Gets Loose
Post by justin_o_guy2 on 06/17/17 at 15:51:50

If you used a tool, it wasn't leaking.
Use antisieze.
I've found plugs surprisingly easy to turn. IDK why.

Title: Re: Spark Plug Gets Loose
Post by eau de sauvage on 06/17/17 at 16:02:02

@S, if it bothers you, you might be a candidate for the 'swing the head cover door out of the way without taking the tank off' mod.

Title: Re: Spark Plug Gets Loose
Post by verslagen1 on 06/17/17 at 16:11:59

4D7F687F797B737F702B281E0 wrote:

The gasket on the sparkplug is not for sealing, it is to prevent it backing out.
The fit of the threads is enough to prevent leakage.

Title: Re: Spark Plug Gets Loose
Post by Savageman on 06/17/17 at 16:31:43

Other than old wives tales I could just use some epoxy on the threads.

After all the black stuff around the threads isn't because it's leaking compression it must just be some kind of burned oil or dirt and oil that just smells like combustion. IDK either? ::)

Title: Re: Spark Plug Gets Loose
Post by batman on 06/18/17 at 18:53:38

Why not use a torque wrench? torque 7-15 ft/lbs for a 14mm plug,15-20 ft/lbs for a 18mm plug. the head bolts are torqued why not the plug?lube the threads oil or antisieze.