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Old 23 July 2014, 11:54   #11
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Water in lower unit ?

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Originally Posted by Landlockedpirate View Post
Yep, spot on. The gear oil is designed to combine with the water, so even if water gets in, the oil will still do its job. It wont settle back out.:
If the previous owner used the correct oil.

Whenever I've dropped oil out the LU the milky bit is always first out the drain hole.
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Old 23 July 2014, 12:30   #12
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If the previous owner used the correct oil.
.

Fair point
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Old 23 July 2014, 16:12   #13
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Just double checked and found there was no seal or washer on the drain plug, only a rubber O-ring on the vent screw so hopefully that was the source of water.
I will do as you say Alan and run it an hour or 2 then re-check the oil.

Which oil SHOULD i be using ? I have some EP80 w90 gear oil here ( automotive type ) is that fine to use for the time being while i check the engine and this water issue, or should i get marine grade stuff ?

i will grease all the nipples and bushings before starting it for the first time.

What would be a basic step by step starting procedure for the engine since we don't know its history ?


It is a merc 15hp ( not sure of exact year but id say late 80's early 90's )

Fresh fuel / oil mix ( 50:1 ) ?

Just a basic starting routine with regards to the choke setting, priming etc.. or anything else that i should be doing so as not to cause any damage
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Old 23 July 2014, 16:34   #14
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Marine gear oil is designed to emulsify on contact with water and still give protection to the gearbox, automotive oil isnt.

Is your gearbox and your choice.
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Old 23 July 2014, 17:10   #15
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Which oil SHOULD i be using ? I have some EP80 w90 gear oil here ( automotive type ) is that fine to use for the time being while i check the engine and this water issue, or should i get marine grade stuff?
Automotive gear oil is okay temporarily, but I'd switch to Yamlube or Quicksilver for ultimate protection. Use new fibre washers for proper seal on drain and fill plugs.

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I will grease all the nipples and bushings before starting it for the first time
Grease nipple points until you see the old grease forced out. Wipe off excess.

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What would be a basic step by step starting procedure for the engine since we don't know its history?
Killcord in, fuel tank vented, choke out, fuel primer bulb hard, and tiller set to start. Ensure spark-plugs are in good condition, replace if unsure. Take up slack on pull cord, then pull. Might start first time. If it does, allow it to run briefly, then push in choke and reduce revs on tiller handle to idle.

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It is a merc 15hp (not sure of exact year but id say late 80's early 90's). Fresh fuel / oil mix (50:1)?
Use TWC3 2-stroke oil. 50:1 is fine.

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Just a basic starting routine with regards to the choke setting, priming etc.. or anything else that i should be doing so as not to cause any damage
Because you don't know history, look to replace water pump impeller, check condition of sacrificial anodes and renew starter rope. I'd also look at thermostat (renew gasket) if removing to clean.
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Old 23 July 2014, 17:17   #16
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^^^^^^

What he says
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Old 24 July 2014, 16:24   #17
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Remove the prop & check for fishing line around the prop shaft, re-grease the propshaft & re-fit the prop, repeat annually.
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Old 28 July 2014, 17:22   #18
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Hi. I had a 1989 variant of this engine that I bought second hand. Excellent engine. It has already been said but I dropped my gearbox oil refilled with quicksilver gearbox oil, new plugs and dropped the lower unit and replaced the impeller. It was my first outboard service and disconnecting the gear rod was the most difficult part of the process. Best of luck.
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Old 31 July 2014, 15:35   #19
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Thanks very much for the detailed replies guys!
It's amazing how much you can pick up and learn from just small bits of info from different people that helps to give a better overall view of things.

Spartacus thanks too for that reply
I followed each step by step ( other than replace spark plugs ) and tried to start but it wouldn't fire. Took the plugs out ( NGK BUHW ) they were pretty gummed up and black, so gave them a wet clean with some fine emery paper, put them back and it fired up on 2nd pull WOOHOO !!

Got it down to lowest idle soon as possible and left it like that, at first the tell tale was spouting water but then stopped after around 30 seconds. I believe these engines have a thermostat and the tell tale stops and starts as and when needed ?

I let the engine idle for around 2-3 mins but the tell tale never spouted anymore water - is this normal ?
Was starting to get worried incase the thermostat had maybe stuck and overheat the thing so i switched off, what duration roughly should there be between spouts ?

I wired the battery up to the starter motor to see if all was well but the starter will not power up.

Checked the switch with the multi-meter, traced the wiring back and the switch is working, there is also 12+ volt on the main supply cables and on the motor casing itself.

What should i check next ? anyone familiar with starter motor issues like this?
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Old 31 July 2014, 17:19   #20
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The tell tail should always be working. Mostly likely something is plugging it. You could try sucking on it, but blowing with an air gun gently is probably the best bet to clear it out. The tell tail is your way of knowing that the motor has water flow. If it stops flowing the motor needs to be shut down as soon as it is safe. Otherwise you risk damage to the motor.

Engage the ignition switch to the starter and gently rap on it with a hammer. Did it turn over? If you have 12 volts going to the starter, and it still doesn't work, other than a bad ground wire, you need to disassemble the starter and figure out why it is not working. Could just be corrosion, or the brushes may have failed. I doubt it needs replacement.
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