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Hydraulic tilt and trim. Oil leak

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 opposite my finger onthe bow side of the unit some kind of outlet leads forward to a plastic screw bung in the side of the drain well on my deck.

20190506_194337.jpg

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On our trip last sunday A large amount of oil arrived on the deck throughthis bung hole. The bung housing is loose and the oil came round it.

I had filled the reservoir in my pre trip check because it was short. It now needs more.

I fear the worst ie some obscure gasket or ram seal has failed. but it might be something simpler. Before i get the spanners and hammers out, can anyone give me any pointers.

or Are there any profesionals who would service this 35 year old unit?

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This is an ebay image of one of these. The bolt hole along the bottom is just visible. 

Im hoping that a stud with an o ring put in this hole might fix my problem .but it begs tje following questions....

why is it ducted into the boat.?

what purpose does it serve.?

 

s-l400.jpg

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 Is it an auto lube 2 stroke with internal oil reservoir? 

If so I would assume the 2 stroke oil would not be the same as the hydraulic oil in the tilt/trim rams?

 

Possible its an overflow for the pre mix tank and its vented internal to stop any spillage? 

 

Your rams for the engine will normally have a way to release the fluid from them, this is encase the motor  packs up or gets stuck so you can drop the engine back down, maybe its something to do with this? It would normal be a sump bolt with o ring like your gear box oil bolt. check to see if it has one located some where else.

Mike

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Thanks for coming in on this.

No it's not autolube . I have found oil on the deck before and blamed my laggardly crew for slopping2 stroke oil about carelessly, but no this is oil from the hydraulics.

 

The small Rams certainly have plastic bleed plugs on the side. But my attention is drawn to the sump plug as you call it. In the absence of wiser advice my best plan at the moment is to lift the motor off and see what's what. If I'm really lucky all ill need to do is tighten it with a new copper or felt washer or o ring.

 

The plastic deck drain plug might be nothing to do with the hydraulics but just happened to be there and became the route of least resistance for escaping oil.?

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water and oil seeped in while at anchor and all you can see is the oil that has separated? makes sense and may explain the problem with the tilt/trim if its low on oil.

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Finally got the mitpr off. looks like the plug has corroded away. I went to clean it with a scrubbing brussh and oil started rolling out.

Now when its stopped draining ill have to get theremains of the plug out without forcing it on inn. Hmmm?

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I'm not sure if it will help but I have a full Mercury workshop manual for this engine it also covers all others mercury 2 strokes from 1970 I think. I bought it when I had a 1988 115 merc 2 stroke for fault finding and it came with a manual for each 2 stroke model merc made. I can zip it up and email it across if it helps with servicing and checking part numbers.

Send me a pm with your email if you would like it sent across.

 

Mike

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Thanks Mike,

that would be helpful. Getting that plug out will likely be a bit of an ' off piste' procedure.  It will be useful to get a part number and picture of it. Graham is handy on the lathe and given a pattern might be able to make one if it is not available. 

We will look at it one evening next week.

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I would use a set of Easy Out screws see below 

 

Bolt Extractor Set 5 Pieces _ Specialist Drill Bits & Accessories _ Screwfix.com.html

 

Carefully drill out the existing screw using plenty of oil.

Increase the dill size to almost the thread size.

If the existing screw has been hardened you may need to use Cobalt drills.

Wind in the extractor anticlockwise carefully with a Tap Wrench and the old screw should wind out.

 

Failing that its an oversized hole and a re tap of the tread.

Try AllFix  for a 10mm Stainless Steel machine screw or a grub screw if it's a tight fit on the transom.

Fiber washer behind the machine screw head should seal it ok. 

 

With patience it should be as good as new.

 

Good luck

 

Mikey B

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Thank you Mikey B.  Hope fully we will proceed along lines like that. 

I PMed Gonorm the following which explains where we are at with it.....

 

That's really decent of you Mike, much appreciated .

It will be a handy resource  as we try to get a year or three more out of this old equipment.

About  this repair, I'm going to look at it tonight. My engineer mate Graham says we can use so called chemical metal to plug the hole if all else fails. Well on close inspection the hole looks a bit beaten up as in a hammer and chisel job has been used to extract a rounded Allen plug. I suspect the the original plug would have been a steel taper plug with Allen drive . This one is not   Shown on the exploded diagram but another one like it is used elsewhere. 

Anyway I recon a previous owner has had to resort to a bodge repair with chemical metal. I'll let you know how we get on.

 

.........ill try to get a threaded plug in there if  I can....

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