1974 OMC 15hp Manifold Bolts

2

2shallow2sail

Seaman Apprentice
Joined
Jul 28, 2008
Messages
30
Does anyone know the proper hole configuration for the manifold bolts? Part #0306409 and #0306418 are listed on the 80's diagram, 5 long bolts and one short. Does anyone know which hole the short one goes in? The diagram doesn't show it, and I tried a long one in each hole and was able to get them to go all the way down. I have a feeling its either the top right hole or the middle hole. I checked Leeroy's and didn't see it mentioned. thanks guys.
 
T

the machinist

Senior Chief Petty Officer
Joined
May 7, 2002
Messages
711
Re: 1974 OMC 15hp Manifold Bolts

If you really look at this intake manifold, you will see that the thickness under the heads of 5 bolts are greater than the top port side bolt. Therefore the shorter one goes there.
 
2

2shallow2sail

Seaman Apprentice
Joined
Jul 28, 2008
Messages
30
Re: 1974 OMC 15hp Manifold Bolts

Thanks Machinist, I'm looking forward to continue re-assembly and have this little powerhouse back on my inflatable this year! I had a broken reed valve causing a lot of issues. Your write-ups were very helpful in the process of diagnosing and executing the repair, thanks again.
 
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