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tl dr: You've hurt nothing by putting more than a little bit of grease in the boot ... don't worry about it. Dielectric grease serves two purposes: Prevent electrical leakage Keep the boot from sticking to the porcelain of the spark plug According to Wikipedia: Dielectric grease is electrically insulating and does not break down when high voltage is ...


I would not recommend packing either the cap or the space between the bearings. The external cap is only a dust cap and is not meant to hold back grease, just keep the dust out. The story is very similar with the inside seal. The seal is just to keep the dust out. If too much grease is put in, it may get displace and get passed the seals making a mess all ...

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