1986 mercruiser transom plate bolt hole size?

lime4x4

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Apr 25, 2007
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Installing a new transom in boat. What size drill bit do i need to drill thru the transom for the mounting bolts for the transom plate?
 

Don S

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Re: 1986 mercruiser transom plate bolt hole size?

9/16 or 5/8" are typical. The MUST be perpendicular to the transom surface.
 

zbnutcase

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Sep 19, 2009
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Re: 1986 mercruiser transom plate bolt hole size?

1/2 in will work too and easier to find. 'nutcase
 

Bondo

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Re: 1986 mercruiser transom plate bolt hole size?

Ayuh,... 1/2" is Fine, it's the size of the studs though, Which means No wiggle room...
 

jaxnjil

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Re: 1986 mercruiser transom plate bolt hole size?

Installing a new transom in boat. What size drill bit do i need to drill thru the transom for the mounting bolts for the transom plate?
lime when i changed my transom assembly this summer, i used 5/8". they were plenty snug when i put it on.
 
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