Engine re-assembly - what grease?

[diver 1]

I've had to completely strip 2 Mariner 40HP engines to replace all the shot engine mounting bushes. Bi-metallic corrosion had seized many of the stainless bolts into the aluminium and I ended up have to very carefully drill 6 of them out and re-form the threads.

I'm now almost ready to re-assemble (just waiting on new bushes from Bill Higham marine) and wondering which grease to use to reduce corrosion should the engines ever have to come apart again. I have super red and tacky marine trailer bearing grease and anti seize copper brake grease and teflon based waterproof bike grease. Which would be the best bet?

Already thoroughly cleaned all the threads of all the holes and will use new 316 bolts,nuts and washes where possible.

It was such a painstaking job I never want to have hassle with it again!

[spartacus]

I'd personally use a Duckhams marine grease. This isn't a job you're likely to do again anyway. Trailer bearing grease is fine, but odds are you'll service the bearings every other season. Copper-ease is a good anti-sieze product, but not in a marine environment. And for the Teflon bike grease, I'm sure it's fine and dandy, but probably isn't up to the job. Wear latex or nitrile gloves when using.

More details here: http://www.castrol.com/castrol/multi...tentId=7055324

[Nos4r2]

Don't use copper based grease-you'll have corrosion issues.

I use Corrosion Block grease for reassembly now.

[mitchc]

Be wary about using grease on critical bolts(mains, big ends, head bolts) you can change the clamp load characteristic of the bolt which can cause snapped/sheared bolts when taken up to the recommended torque.
For most of my engine builds if I need a non critical bolt to come out again I use silkolene rg2. Been using it for years ands it's never let me down.

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[martini]

The best stuff to use to prevent galvanic corrosion, perfect for ss bolts in aluminium is tef-gel. It's expensive, but you don't need to use much.

[jyasaki]

Originally Posted by mitchc

Be wary about using grease on critical bolts(mains, big ends, head bolts) you can change the clamp load characteristic of the bolt which can cause snapped/sheared bolts when taken up to the recommended torque.

Lots of opinions on this one. One school is that the torque holding force is due to the threads tightening down on each other; another is determined by a combination of friction in the threads and the head of the bolt, and a certain amount of stretch; another is that it's all in the stretch (which distorts the threads, locking them in place)More than likely there are a bunch of others.

Use of grease or advisement against doing so would depend on which school you believe.

jky

[Turbodiesel]

Quicksilver special Lube 101.

[ADI]

Quicksilver special Lube 101

Any Mercury dealer will supply it to you. It is the best I've used

[Damien.]

Quicksilver 101.

It looks like The Hulks load but its amazing stuff.