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Old 15 June 2015, 16:53   #1
Country: Ireland
Town: Tralee
Boat name: Waverover
Make: Humber
Length: 6m +
Engine: Outboard petrol 115h
Join Date: Jun 2015
Posts: 1
Engine startup

Any advice on starting up a mariner 115 optimax that has not been started in four years

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Old 15 June 2015, 18:09   #2
spartacus's Avatar
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 60hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 3,053
Welcome to the forum!

An engine that's not been turned over in 4 years should be fine, but it depends how it's been stored. If it's been stored inside with a dry ambient temperature, then great. If it's been outside in all weathers, then you've possible condensation to contend with, etc. Basically you're going to have to service it.

First things first. New fuel. That means draining fuel lines and tank, including a new fuel filter on the engine. These Optis use specific DFI oil, so check levels. Conventional TW3 2-stroke oil is no use. Interesting link here on servicing the fuel pump:

Next battery. Put on trickle charge and check voltage. Could start first time, but might take a few attempts for it to kick into life. One word of warning, turn the ignition for only short bursts or you'll burn out the starter motor. The toothed belt should probably be changed too. Visual inspection is no use.

New spark plugs. Grease thread very lightly and don't over-torque when tightening. I'd be inclined to squirt a little DFI oil into the cylinder bores and turn over briefly without the spark plugs (use a rag to towel to stop oil spraying out). Check the cylinders with a torch to gauge condition.

Renew the impeller, new gear oil and lube the drive-shaft Lube the gear linkages too.

Run a length of strimmer wire into the tell-tale. Sometimes it may block with sediment if it's been sitting idle, especially after 4 years.

I'd also be inclined to check the thermostat. You'll need a new gasket. The thermostat can be cleaned with a soft bristle copper wire brush and lightly lube rubber with marine grease. You can test in a pan of boiling water to check it opens.

Connect up muffs, then start it over.

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Old 15 June 2015, 19:25   #3
CJL's Avatar
Country: UK - England
Town: London
Make: Ribcrafts
Length: 5m +
Engine: 150hp/2x115hp
MMSI: 235090215
Join Date: Oct 2002
Posts: 2,098
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Also before you start it turn the ignition on, wait for the beep and check the Smart Craft Gauges for error message. Only once the beep has stopped turn the key to the start position.

Might be worth pulling plugs and if dirty cleaning and reset them. Spark gap is in the service decal under the cowl.

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Old 15 June 2015, 23:08   #4
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Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 6m +
Engine: 2 x 115 Etecs/DF140a
MMSI: 235060745/235111389
Join Date: Feb 2008
Posts: 6,406
Before I did anything, I'd stick a battery on it, take the plug leads off & turn it over once to see if it's seized.
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Old 17 June 2015, 11:24   #5
Country: UK - England
Town: Chesterfield
Boat name: Sea Quell
Make: Picton Cobra
Length: 5m +
Engine: Merc Optimax 175XL
MMSI: 235038298
Join Date: Sep 2003
Posts: 761
Before you spin the engine over, I would also remove the drive belt, put 1-2 drops (and only drops) of dfi oil into the compressor intake and turn it over a few times by hand. Check and replace the belt if necessary
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Old 28 June 2015, 11:12   #6
Country: Canada
Town: Southern Ontario
Boat name: -Unknown-
Make: SeaMax
Length: 4m +
Engine: Merc/Minn Kota
Join Date: Mar 2012
Posts: 216
Check for prop rotation.

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