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Old 11 June 2019, 15:24   #1
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Country: UK - England
Town: East Anglia
Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Yamaha 15Hp 2-stroke
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Yamaha 15F 2-stroke. Purchase, check & Service.

As mentioned in another thread I realised after just a year with our Mariner 9.9 4-stroke... despite liking the convenience of no oil mix & quiet smoke free trolling... it was the wrong balance of weight vs power for us. 36kg is the sensible max lift for me so the 15hp 2-stroke hunt started.

I'd always liked the look of the Yamaha quality and heard good reports so as the Mercury/Mariners were well known to me (had 3) thought a change might be interesting.

Hence today this landed. A clean 2003 model with... for me... the benefit of my favourite 25l Quicksilver tank. Also instruction manual, emergency pull cord and flush adaptor. Oh yes and got lucky. It has the expensive... if bought from Yamaha... accessory 12v output.

Went against all the rules buying from a phone call and emailed images. Arrived on a pallet this morning and as follows below got straight on with checking it over and a major service.
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Old 11 June 2019, 15:30   #2
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Country: UK - England
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Whoah! Thatís nice.

Looks brand spanking new.
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Old 11 June 2019, 15:42   #3
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Country: UK - England
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Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
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Knowing I wanted a Yamaha 15F I bought a used workshop manual on Ebay the other day as there were no easy ones available online I could find and a real copy is easier in the workshop.

As the weather is so ghastly I've left the carb check, tuning jobs etc until I can get it in the tub so today was an erratic series of jobs.

I checked the plugs but they were new and correctly gapped. The gear oil was also new... this was obvious as the drain plug wasn't quite nipped up and possibly with the wrong seal so there were drips on the pallet. I have OE seals if needed.

The prop didn't come off easily so I engaged the three leg puller... with Jubilee clips to keep it behind the exhaust flange. It then took very little effort to remove as there was no corrosion just old hardened grease on the splines. The prop was acceptable so I tapped out a few dings and painted.

Oddly it has a 10.5" pitch fitted which would be high in our experience... perhaps it's been on a light skimmy boat.

I greased and oiled all pivots. The tilt tube/saddle pivots were fitted with original screw head plugs not nipples. But filling the thread recess with grease a couple of times and pushing it through by replacing the screws did the job.

For me with an older OB I like to see in the waterways at an early stage, regardless of if it pumps water or not. I removed the thermostat and was pleased to see the channels were free of anything other than tiny deposits. The thermostat tested OK in a saucepan so went back in.

The other thing that makes me nervous about an older OB until I know is... will the lower unit bolts come out OK? I'm putting a full pump/impeller kit in when it arrives tomorrow so for today I was pleased to find all the bolts came out easily. Similarly the bolt holding the large anode underneath the AV plate could be a snapper but came out OK. Anode will do another few years.

Other than that just a wipe down of the powerhead with a WD40 soaked rag and car polish on the leg and hood.

So far it's looking OK.
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Old 11 June 2019, 15:47   #4
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Country: UK - England
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Boat name: Nimrod II
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Yep Chipko it's tidy enough for what I like to see. There are a couple of scratches on the hood and leg that have been touched in with a fairy close match brush but in keeping with the age.

Tomorrow's tasks... Overhaul water pump. Fit "Tiny tach". Test run in tub. Compression test. Put correct gearbox plug seals on. Perhaps put the proper Yamalube gear oil in. Pressure test gearbox (routine, not because of leaks).
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Old 11 June 2019, 15:50   #5
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A friend had one on his Zodiac......ran perfectly for ages! Looks like a nice find
Fresh water use?
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Old 11 June 2019, 16:08   #6
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Country: UK - England
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The anode looks to have done some work and it came from the coast.... but who knows really in its 16yr life. My experience is that 20hp and under leisure use OBs with just basic care/maintenance can stay in great order.
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Old 11 June 2019, 16:22   #7
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Country: UK - England
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Boat name: Bombard, Y-162
Make: Aerotec 380, Y-Class
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Engine: Mercury Mariner 15hp
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Welcome back - once a smoker always a smoker!
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Old 11 June 2019, 16:34   #8
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Yep and I can defer the test tub start up for a nice day when next door has his BBQ so we kind of blend fumes at the fence line.
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Old 12 June 2019, 04:21   #9
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lovely specimen David i did wonder about the 9.9 being fit for your needs looked after that will last years enjoy.
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Old 12 June 2019, 04:59   #10
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A nice bit of kit!
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