MC-1 and Mercruiser 120. Need Bolt Sizes for transom

[dezmond]

Good Morning everyone,

Hoping you might be able to help me out. I want to drill my holes through my transom today as well as steering relief holes. I am not sure what size to drill for either... Could someone help me out?

Thanks all

Dezi

 

[Bt Doctur]

Just measure the studs in the housing ,almost sure there 7/16 ths

 

[dezmond]

Thanks. That’s what size I got. The transom template holes are 1/2”. I figured I would drill oversize, fill with PB, re drill to 1/2” and use 5200 when I install the bolts. Does this sound right?

 

[Bondo]

and use 5200 when I install the bolts. Does this sound right?

Nope,..... No 5200,..... If the transom ever had to come off,............ it Won't,.......

I drill the holes 1/2", 'n use a new fresh Merc transom gasket,.....

 

[dezmond]

Perfect thanks . Any idea what the hole size is for the steering relief cut outs?

 

[Bondo]

Ayuh,..... I just did one last summer, but don't remember which hole-saw I used,......

1, 1/2" maybe,..??

 

[fishrdan]

Make sure you get the right gasket, there are 2 different transom gaskets for the MC-1 drives.

http://mercstuff.com/images/transomgasket1.jpg

 

[dezmond]

FisherDan Thanks for that. I checked and my old gasket measured 1.250. I will get a new one for sure when I get closer to putting the gimbal and transom plate back on. I also measured my transom thickness and as of now I am at 1.870” thick. I believe I need to be at least 2” for Mercruiser correct?

 

[Bondo]

I believe I need to be at least 2” for Mercruiser correct?

Ayuh,..... 2" to 2, 1/4",.....