1990 sea cock and hose sizes?

[KWKloeber]

I am trying to determine the sea cock and hose/hose barb sizes,  I checked the MK-1 manual, but the layout of the thru hulls doesn't indicate any sea cock thread or hose/hose barb sizes.

Can anyone help me fill in a few of these blanks?:

Are the Marelon raw water, sink, head, etc, sea cocks all 3/4" thread?
Hose size, sea cock to strainer?
Inlet and outlet thread size?  3/4"?
Galley sink drain hose size?
Head inlet and sink drain hose sizes?

Thanks for ANY help!
Ken

[MarcZ]

on my 93 I have

Head Sink                                                thru hull  1/2
Head Inlet / Shower Sump Outlet            thru hull  1/2
Engine Raw Water                                   thru hull  1/2  -> 1/2 Strainer
Galley Sink & Ice Box                               thru hull  3/4 
Macerator                                                thru hull  3/4  barb 1"  (?)

[rmbrown]

If only that was a simple question!

Macerator Outlet
Thru Hull Thread OD – 1.03" 
Hose Barb OD – 1.08"
Hose Barb Configuration – 180
Thru Hull Configuration – flush

Head Sink Outlet
Thru Hull Thread OD – 1.02"
Hose Barb OD – 0.85"
Hose Barb Configuration – 180
Thru Hull Configuration – flush

Head Inlet / Shower Sump Outlet
Thru Hull Thread OD – 1.02"
Hose Barb OD – 0.84"
Hose Barb Configuration – double 90
Thru Hull Configuration – flush

Engine Raw Water Inlet
Thru Hull Thread OD – 0.81"
Hose Barb OD – 0.67"
Hose Barb Configuration – 180 female pipe
Thru Hull Configuration – flush

Galley Sink and Ice Box Outlet
Thru Hull Thread OD – .82"   
Hose Barb OD – 1.09"
Hose Barb Configuration – single 180
Thru Hull Configuration – flush

Galley Raw Water Inlet
Thru Hull Thread OD – 0.82"
Hose Barb OD – 0.52"
Hose Barb Configuration – single 90
Thru Hull Configuration – mushroom


All that said, the two hose barbs that are 1" are on 3/4" valves and thru hulls and my engine raw water is 1/2" which seems way too small, so I think I'll glass over the holes and redrill for valves that match the hose.

[Noah]

Jon- do you recall what size your replacement thru hulls and flanged seacocks were?

[Jon W]

I have 5 total. From memory (a risk lately) 3 x 3/4" flush thru hulls and flanged sea cocks; plus 2 x 1/2" flush thru hulls and flanged sea cocks. For some reason I'm thinking the galley sink drain is 1" not 3/4".

[Noah]

Did the yard have issues with the new flush thru-hulls fiitting the existing hull countersunk holes/angles, or did they glass over and redrill?

[Jon W]

I don't know those details sorry.

[rmbrown]

I finally got mine ordered today...  I decided to glass in and redrill and go with mushrooms rather than flush mounts since none fit the countersinks already in my boat.

I left my galley sink raw water in at 1/2.

I upsized my engine cooling water intake from 1/2 to 3/4.  (It steps down to a 5/8 hose anyway, but I'm replacing the strainer, mounting it off the valve, and running 3/4 from the valve to the strainer and strainer to engine before stepping down to 5/8.

I upsized my galley sink drain and macerator output to 1" to match the hose barbs.

I left my head inlet / shower outlet and head sink drain at 3/4.

I ordered them all from Forespar since I couldn't find the configurations I wanted of the OEM 93 Series used on the new boats anywhere else.

[Noah]

Since you opted to "glass-in and re-drill", why did you decide not go back with flush thru-hulls instead of mushrooms? Too much work/expense?

[MarcZ]

You can re-drill old flushed thru-hulls and use them as "washers" for new mushrooms - no glass work needed.
Possibly not most elegant solution but no compromise on strength either.

[rmbrown]

I'm dumbfounded.  That's brilliant!