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Old 03 July 2016, 17:50   #1
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Country: UK - England
Town: Bournemouth
Boat name: Lucky Heather
Make: Whaly
Length: 4m +
Engine: 30hp Mariner
Join Date: Mar 2015
Posts: 95
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So finally the mariner rebuild is done.

Firstly I'd like to thank all those how gave their 2 pennys on this project.

Brief history, I bought a 1992 Mariner 30 (689 version) a while ago of ebay (first mistake) it seemed clean and looked after and it was a good price at 500 so stuck it on my whaly and first problem was the clutch dog was on back to front, which took a few weeks to sort out. Anyway, problem solved and it did the trick through the summer but lacked a little luster, took it out last November and it just wasn't happy so I decided to rebuild it over the winter.

Split the engine easy enough and only had on bolt snap, found that the mariner was made by Yamaha and 99% of the parts including pistons are inter changeable. Had the block rebored +50 new pistons, rings and gasket set. rebuilt it, started first time then 20 mins later the electrics pack up, I ended replacing the CDI, coil, trigger and spark caps. Started again but wasn't happy, found out that the intake gasket was different and not sealing, fixed that. Next the flywheel woodruff key snapped and throw out the timing, 2 days of head scratching before I fixed that. Next the gear support bracket snapped which I had re welded.

So their I am with all that work done, too deep in the work to just quit and replace it, pulled start and it fires into life again, wonderful....until the crank bearings shat themselves 10 minutes in and called for another rebuild!! Again too deep to quit, new bearings sourced (non original as some were no longer available) crank rebuilt and balanced and finally it runs sweet with 3 hrs run in. Here's to a dry wind free summer! Bit smoky as its running a little premix with the auto lube but better safe than sorry at this point!
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Old 03 July 2016, 17:53   #2
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Country: UK - England
Town: Bournemouth
Boat name: Lucky Heather
Make: Whaly
Length: 4m +
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Posts: 95
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better vid clip
Attached Files
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Old 04 July 2016, 17:55   #3
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Country: Ireland
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Make: Rimini
Length: 5m +
Engine: dt85
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Posts: 237
Wow that's dedication!
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Old 04 July 2016, 19:13   #4
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Country: UK - England
Town: Bournemouth
Boat name: Lucky Heather
Make: Whaly
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Posts: 95
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Nah, that's a head ache! Can't wait to install in on a new adjustable jack plate.
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Old 05 July 2016, 01:36   #5
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Country: UK - England
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Just as a matter of interest ,how did you know the crank bearings were shagged? Nik
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Old 05 July 2016, 03:35   #6
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Country: UK - England
Town: Bournemouth
Boat name: Lucky Heather
Make: Whaly
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Join Date: Mar 2015
Posts: 95
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They started to get a little rattly on the deceleration and then just started to grind. All the bearings sizes are available from most bearing supplier, they don't have the location pins to stop them spinning in the case but I got around that by using loctite high strength bearing retainer. I put the cam in, tweaked the bolts up and the put the upper oil seal in, under the flywheel, cranked that down, turned the engine by hand then tightened the block bolts.
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Old 05 July 2016, 17:58   #7
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Country: UK - Scotland
Town: Fort William
Make: Humber Destroyer
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Cam??
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Old 05 July 2016, 19:20   #8
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Country: UK - England
Town: Bournemouth
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cranks sorry!
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Old 06 July 2016, 02:14   #9
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Country: Netherlands
Town: amsterdam
Boat name: Osprey 18
Make: Osprey
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Join Date: Oct 2015
Posts: 33
Congrats on the rebuild.
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Old 22 July 2016, 19:18   #10
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Country: UK - England
Town: Bournemouth
Boat name: Lucky Heather
Make: Whaly
Length: 4m +
Engine: 30hp Mariner
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https://www.instagram.com/p/BH75K61B...joehartdesigns so far so good!
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