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Old 05 November 2003, 05:54   #1
Country: UK - England
Town: Wickford, Essex
Boat name: Seahorse V
Make: Avon Searider
Length: 4
Engine: Mercury 50HP
Join Date: Jul 2003
Posts: 57
Fitting an engine

Hi All,

I will very soon be fitting a different engine on my 4m Avon Searider. The current one that has just been traded in was a Mercury 50HP manual tilt-trim. The new one is a Suzuki DT55 power tilt-trim.

I am told that the holes from my old engine in the transom will not match up with the holes for my new engine. Since I am completely refurbishing my RIB anyway, I intend to fill all the holes and start again.

My question is, is there a particular position that I need to fix the engine ( i.e. is it dead centre of the transom or slightly offset ).

Any help would be much appreciated.


slangley is offline   Reply With Quote
Old 05 November 2003, 06:14   #2
Country: UK - Wales
Town: Pwllheli-North Wales
Boat name: Delta 1
Make: Delta
Length: 6m +
Engine: Mariner 90hp Optimax
Join Date: Mar 2001
Posts: 2,367

it is differnt for evry hull, in the searider manual there will be an offset table.

At a guess it will be 1/2" starboard

JG Marine Services Ltd Specialist Safety Boat Services

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Jono Garton is offline   Reply With Quote
Old 05 November 2003, 07:03   #3
Country: UK - England
Boat name: Won't get Fooled Again
Make: Ribtec
Length: 6.5
Engine: Honda 130
Join Date: Mar 2002
Posts: 888
I now that David Manning did a very good job of changing his Outboard on his sea rider and I believe he took some pictures of it and posted them on the gallery pages. i fancy it was about two years ago, he might be willing to give you some advice.
I need a little bit of Rhythym and a little bit of Blues
thewavehumper is offline   Reply With Quote
Old 15 November 2003, 15:57   #4
Country: UK
Make: Ribcraft
Length: 5.85m
Engine: Mariner 115hp 4 stroke running on LPG
Join Date: Nov 2003
Posts: 31
I would put it about half an inch to three quaters of an inch off set to the right.
Measure the transom from chine to chine and get the centre line of the transom, then measure the offset.
Make sure you get the height right as well, The Cavitation plate (the one above the prop) should be in line or just below the bottom of the hull.

Then before you drill the transom check your measurements again!!.

You can buy transom drilling templates but you might get one with you engine as its brand new.
Drive it like you stole it!
Diesel is offline   Reply With Quote

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