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Old 30 July 2010, 15:00   #1
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Country: UK - England
Town: Honiton
Boat name: Sunrise
Length: 4m +
Engine: Mariner 60 HP
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Mariner engine rebore

Been running a Shetland Cadet for fishing playing etc for ten years with a faithful Mariner 60HP. Always maintained and serviced it is in great condition. Then earlier this year whilst skiing with my brother, one of the pistons let go. I have been told that this is a common problem with theses engines. My problem now is how to resolve? Consulting the workshop manual I think i can rebore the scratched cylinder and replace with an oversized piston.... Or purchase a new block...? Can anyone confirm my suggestions? And if so can they point me in the right direction for the most cost effective solution..
Many thanks
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Old 30 July 2010, 15:03   #2
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Country: UK - England
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Make: Avon SR4,Tremlett 23
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Is it a clamshell Mariner?

Welcome to the forum.
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Old 30 July 2010, 15:19   #3
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Do you refer to the engine casing ' wrap around' or something else?...if so the it does wrap around!


Just dug out details

Mariner 60HP ELPTP 3cyl serial no. OC203404

Thanks for the welcome
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Old 30 July 2010, 15:45   #4
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Yep wrap around is clamshell.
Hopefully this thread may or may not help:

http://rib.net/forum/showthread.php?...ight=clamshell
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Old 30 July 2010, 15:58   #5
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60 `

Your best bet on this AGE of OB was too try and sorce the part's in the USA . Going thru Barrus or any local dealer will cost you a fortune . and looking at your serial number Im pretty sure this is a clam shell OB and if you were to go OS you would need to go .30 oversize . Sutton rebores in LONDON do all my oversize stuff and are pretty good . I just send in the piston and block together and they do the rest .
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Old 30 July 2010, 16:09   #6
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Mariner 60

Great info thanks - the workshop manual says that I only need to rebore the damaged pot and the OB will cope with one oversized piston ..? So do you send oversized piston and block together ? And can you point me in the right direction for the piston.
Many thanks
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Old 31 July 2010, 18:33   #7
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pm sent
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Old 01 August 2010, 06:48   #8
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Mariner 60

Thanks vm will let you know how I get on!
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Old 02 August 2010, 05:58   #9
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Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
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Engine: Merc 60 Clamshell
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Hello & Welcome.

My boring man will be not much use to you, as you are at the other end of the A1, however I ended up using Mallory Pistons, which after a lot of googling, appear to be equivalent to the latest level of the pistons for that machine, but at almost the cost of one Merc piston for the set of three!

Rest of the story is in Chewy's link.


Out of curiosity, which one let go?
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Old 02 August 2010, 10:15   #10
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I needed a 150 Opti rebored a while ago, Barrus directed me to this place.....

http://www.dolphinamericanservices.co.uk/ (they used to trade as L & J Marine)

They not only did the rebore, but supplied the piston as well!
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