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Recently, I bought a brand new idler pulley for serpentine belt system. When I opened the package, it included the idler and its bolt (picture 3) + a plastic dust cap (picture 2) + a piece of cardboard (picture 1) which I'm not sure what should I do with it! Is the cardboard thing also a kind of dust cap? Should I install it on the back of the pulley? Guide me please! I have seen plastic dust caps before but I have some concern regarding the use of them. The plastic cap can prevent dust and water from entering the bearing but I think it can make it harder for the bearing to dissipate heat because it covers the whole surface area. Correct me if I'm wrong and tell me whether you think the dust cap should be installed or not.

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LFY MP7.3
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1 Answers1

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The "cardboard thing" is just there to keep the bolt in place while in packaging. Discard it as it's not needed. Leave the cap off during installation, then place after everything's together. It's basically a dust cap. It isn't truly needed, but will help with longevity.

Pᴀᴜʟsᴛᴇʀ2
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