Gummage Posted May 9, 2019 Report Share Posted May 9, 2019 This is the tilt and trim unit on my mercury 75. Quote Link to comment Share on other sites More sharing options...
Gummage Posted May 9, 2019 Author Report Share Posted May 9, 2019 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. Quote Link to comment Share on other sites More sharing options...
Gummage Posted May 9, 2019 Author Report Share Posted May 9, 2019 in this pic it is fainlu visible just behind the red bilge pump cover Quote Link to comment Share on other sites More sharing options...
Gummage Posted May 9, 2019 Author Report Share Posted May 9, 2019 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? Quote Link to comment Share on other sites More sharing options...
Gummage Posted May 9, 2019 Author Report Share Posted May 9, 2019 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.? Quote Link to comment Share on other sites More sharing options...
gonorn Posted May 10, 2019 Report Share Posted May 10, 2019 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 Quote Link to comment Share on other sites More sharing options...
Gummage Posted May 10, 2019 Author Report Share Posted May 10, 2019 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.? Quote Link to comment Share on other sites More sharing options...
gonorn Posted May 10, 2019 Report Share Posted May 10, 2019 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. Quote Link to comment Share on other sites More sharing options...
Gummage Posted May 18, 2019 Author Report Share Posted May 18, 2019 Quote Link to comment Share on other sites More sharing options...
Gummage Posted May 18, 2019 Author Report Share Posted May 18, 2019 Finally got the motor 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 the remains of the plug out without forcing it on inn. Hmmm? Quote Link to comment Share on other sites More sharing options...
gonorn Posted May 18, 2019 Report Share Posted May 18, 2019 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 Maverick Martin and Stuie 2 Quote Link to comment Share on other sites More sharing options...
Gummage Posted May 18, 2019 Author Report Share Posted May 18, 2019 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. Quote Link to comment Share on other sites More sharing options...
Mikey B Posted May 20, 2019 Report Share Posted May 20, 2019 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 Quote Link to comment Share on other sites More sharing options...
Gummage Posted May 20, 2019 Author Report Share Posted May 20, 2019 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.... Quote Link to comment Share on other sites More sharing options...
Gummage Posted June 7, 2019 Author Report Share Posted June 7, 2019 .......no I won't. Enginerr/Welder Graham checked it over with me. neither the ebay photo nor gonorns service manual show this second hole. Its a bit rough roundthe edges because it is a sea corrosion hole. luckily Graham is a qualified aluminium welder. If i could get the unit off and back to his shop he could weld the hole up. Gonorm, your workshop manual was invaluable in its description of how to strip the unit off first undo the large crossbar nuts...despite its age they swung undone easily!undo the three bolts on the side of the unit.... they yielded except the last one which sheared undr the head ....knock the sides apart.......reluctantly they wiggled over and after stripping the wiring...out it came. over the Graham's and.. and he worked his magic. now.... hoping the welding hasnt wreaked havoc with seals etc and i can remember how to pput it back together....the weekend project. Jim, 2006holmwood, Stuie and 3 others 6 Quote Link to comment Share on other sites More sharing options...
gonorn Posted June 8, 2019 Report Share Posted June 8, 2019 Nice Job! I'm glad the manual was off use to some one. If it helps squeeze another couple of seasons out of the engine it will be worth the trouble to take it apart. Mike Hooky 1 Quote Link to comment Share on other sites More sharing options...
Gummage Posted June 13, 2019 Author Report Share Posted June 13, 2019 looksasgood as new. so good ive uploaded it twice! 20190613_094049.mp4 20190613_094049.mp4 gonorn and Hooky 2 Quote Link to comment Share on other sites More sharing options...
Hooky Posted June 13, 2019 Report Share Posted June 13, 2019 Glad to see your getting her all ready I have plan Quote Link to comment Share on other sites More sharing options...
Jim Posted June 13, 2019 Report Share Posted June 13, 2019 Looks like a new one ! Quote Link to comment Share on other sites More sharing options...
Gummage Posted September 24, 2019 Author Report Share Posted September 24, 2019 It took until last Wednesday before Endeavour3 made it back to the water and we gave it all a good run. Hydraulics all worked fine! We had some starting problems as the electric choke wasn't functioning. (Why did they put the manual choke under all the cladding on these? Are all outboards like that?) Anyway it's another little thing to investigate and hopefully not such a big challenge. Obviously this is a fairly minority interest thread, but I'd like to thank everyone who showed an interest and helped especially Gonorm and the people that run this site and club......it really is a powerful information exchange. and the fishing.........we and all the undersized specimens in the bay practiced hard for next year and had fun doing it. Stuie, sparky, Jim and 2 others 4 1 Quote Link to comment Share on other sites More sharing options...
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