Re: Newbie Questions Restoring 1957 Johnson 18hp FDE-11

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chris-p


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#68458

No I do not like 3M 847 for crank halves. It has fillers in it. You want an Anaerobic product. Like Loctite 515 or 518. The 518 will require an activator.

The Permatex equivalents are 51531 and 51813. As above, the 51813 requires an activator. If you use the 518 or 51813, follow instructions to a tee.

There are many other anaerobic sealers, like the OMC Gel Seal, etc…

Main thing is that it is anaerobic, as in does not harden in presence of oxygen. As you can imagine, if it starts to harden before you get the halves torqued, you will get lumps, which will create crankcase leaks. I personally like the Loctite 515, but not saying it is the best, just what I use.