Changed air cleaners and the new one an Arlen the crank case bolts have worked themselves loose now twice.
What is the best thing to use?

Thanks

 

Blue loctite

 

In most cases Blue Loc-Tite will work on most "medium duty fasteners Save the Red and Green fir the serious stuff

 

Used blue but it might be old..

Thanks

 

throw out the old......get some new stuff.......

 

And make sure everything is clean!

 

Yes! Wire brush the bolts, clean the female threads and the male threads as best as possible, then spray with brake clean. Let dry or blow dry, then use blue loctite. If they are parts that gets hot, then you might need a heat resistant loctite. Also if you can, store the loctite in the fridge when not in use. It keeps allot longer. YD