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Old 23 March 2014, 09:10   #1
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Newbie from Brighton

Hello All

Been reading a few posts for a few weeks and the site looks great. I have an old Mercury outboard 4HP 2Stroke 2 Cylinder (Thinks is a Mercury GNAT) which I attend to use on a Zodiac 285 fastroller. My first problem with the outboard is that the transom clam bolts appear to be sezied. Tried putting loads of penetrating oil on and soaking in boilling water with washing up liquired however they still appear to be stuck. Any one got any tips?

Also another really dumb question is what two stroke oil would I need and what kinda of mix would I need?

Thanks for any help in advanced.
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Old 23 March 2014, 09:28   #2
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Leave out the boiling water and washing up liquid.

Soak in penetrating oil, carefully applied heat is the next step. If they're too 'grown in', you may not get 'em free.

That o/b is a tiddler and only suitable for tenders or as an aux, not as a main. That 285 must be rated to 10hp ish. With an old 4 on it, it'll be flater than a witch's tat.
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Old 23 March 2014, 09:41   #3
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I have soaked them with penerating oil for about 2 weeks. I have sprayed it on both sides of the bolt with no luck. I take you heat the casing not the bolt?

Thanks your your help
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Old 23 March 2014, 12:40   #4
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lean the engine over and let the 2 bolts be in something like a washing up bowl or something like that then 5 litres of diesel or till the bolts are covered, then when you come to loosen them move only slightly backwards and forward and keep doing that
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Old 23 March 2014, 13:19   #5
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Combining the posts from Mollers and Tim&Linda might be another option, i.e., some gentle heat and then diesel. As it cools it will draw diesel into any voids.
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Old 23 March 2014, 18:16   #6
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Bought some diesel and I will just soak the bolts in a bowl before heating. I shall leave it a week and if its still solid will give the heat a go.
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