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Old 26 October 2004, 17:26   #1
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Any tips for taking "open" engine back into service?

So, my new parts have arrived, back in late august i'd hope that i would get them within a week or two.. turns out to be a month or two!

All this time, the lower unit has been sitting without oil (however, with plugs in) and sparkplugs removed, and carb drained. Do you think it might be worthwhile shoving in some 3 in 1 oil just for the sake of it? to get the piston rings freed up again? I only have one fueltank so cant really mix a oilrich fuel up because the tank has about 20L in it at this moment...

wil to much oil harm it? or will it just burn off as black smoke in our lovely greenhouse polluted ozone layer thingemie in a SSSI area?

Help appreciated.

Thanks,
Daniel
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Old 26 October 2004, 18:03   #2
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Daniel, put the plugs in and fill the gearbox (from the bottom) and fire her up

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Old 26 October 2004, 20:49   #3
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i semi remember cleaning the cyclinders with something... and i expect all lubrication that WAS there has now gone, perhaps prime it and pull over a few times until petrol gets into crankshaft housing?
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Old 27 October 2004, 09:21   #4
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Daniel,

As Pete says just fill the gearbox and fire her up - nothing to worry about. If your using pre-mixed fuel and its been sitting for a while give the tank a gentle shake to make sure the oil/petrolís mixed.

I certainly wouldn't put 3in1 oil in anyway - use the same oil you mix with the fuel.
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Old 27 October 2004, 09:31   #5
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Quote:
Originally Posted by Mr-d
i semi remember cleaning the cyclinders with something... and i expect all lubrication that WAS there has now gone, perhaps prime it and pull over a few times until petrol gets into crankshaft housing?
If you wish to be cautious (no problem with that) then prime cylinders with a little of you oil used for mixing, turnover with plugs out then refit plugs and go for it. Whoops nearly forgot put oil back into the gearbox

Good luck.


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Old 08 November 2004, 09:15   #6
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Okay, gearbox is filled up (someone needs to redesign the quicksilver tubes / Mercury filling system.. no wonder you need 2 tubes, as half a tube leaks out during fill!)

Managed to fit the coils with some Ty Rips, put a piece of squishy rubber foam under them to absorb any vibrations/movement (and to stop them breaking) Fitted the new cables/sparkplugs, turned it over a few times with the sparkplugs out.. 2 very healthy looking nice sparks!

Stuck the sparkplugs back in.. primed the thing, left the cables off and tried to turn over... the first few times i managed to get the flywheel to rotate halfway (and then solid on compression/friction), took the plugs out again, sprayed some mixed petrol down the hole... turned it over freely again, stuck the plugs back in and pulled, this time got 1,5 rotation out of it... but im still to scared to touch it.. if i cant even rotate it by hand (By pulling) how in earth will it start without yanking the cord out of my hand, and smashing my hand up against the cover (which has a VERY sharp edge!)

im a bit reluctant to start it as the last thing i remember of it is backfiring + when starting pulling over was very easy

Any more solutions to a stiff outboard engine? i think i used engine degreaser in it which eats the carbon away.. and the carbon must be floating around inside around the pistons.... 3 in 1 seems a easy option! or should i try some sunflower oil or something?
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Old 08 November 2004, 10:03   #7
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Before we go any further, how old is this engine and wots it worth to you ?

Looks like you have a choice, pull start the thing or pull it to pieces, but I am not sure you are going to be able to rebuild it and manage to get good seals around the crank cases, needed for compression if its old.

You could try double mixing a small quantity of petrol and just go for it. When the engine fires you know that the oil/petrol is getting to the crank, bearings and up into the cylinders.

The pull start should not pull you hand back into the engine, but it might hurt if you get one piston top dead centre,

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Old 08 November 2004, 10:11   #8
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Umm, just spent 220 quid on it (well, my mum did.. she's a bit angry with me for spending 220 on it) but then again its a 1978 engine... and when it worked it worked like a tank... (and that was with broken coils!)

i think ill just give it a yank, wear a big glove and hope it wont backfire, locking the starting mechanism up and drawing the cord it at approx 1M/s or something (It has done it before..... and each time i managed to get my hand off JUST in time)

Okay.. where are my skiing gloves...
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Old 08 November 2004, 10:36   #9
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Riiiiight.. just tried.. no pull cord jerked out of hands (even though i was wearing gloves! )

Emm, backfire through exhaust sending water flying approx 6ft high... my guess is either the ignition that is to late, or excess of petrol that lights up when the exhaust port is "Open" causing what is in the cylinder to set alight to whatever is in the exhaust, creating backpressure failing the cylinder to take the next wave of fuel in.....
So, we got Air, we got fuel, we got a spark and we got a bang... but something in that chain is wrong

or is this something else?

Thanks,
Daniel.
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Old 08 November 2004, 10:52   #10
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Quote:
Originally Posted by Mr-d
Riiiiight.. just tried.. no pull cord jerked out of hands (even though i was wearing gloves! )

Emm, backfire through exhaust sending water flying approx 6ft high... my guess is either the ignition that is to late, or excess of petrol that lights up when the exhaust port is "Open" causing what is in the cylinder to set alight to whatever is in the exhaust, creating backpressure failing the cylinder to take the next wave of fuel in.....
So, we got Air, we got fuel, we got a spark and we got a bang... but something in that chain is wrong

or is this something else?

Thanks,
Daniel.
Silly question but have you connected the new coils correctly?? backfire could be because there in the wrong order!

Brian
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