ZF SD10 seacock replacement

[coconha]

Hi there, first time posting here. This forum is a great resource!

My question:
Does anyone know the thread spec of the seacock and nipple of this saildrive?

Long history behind the question: I have a SD10 behind a Nanni. Last week, the seacock handle broke on my hand. The handle seems made out of aluminium and it was porous and brittle. Tried to pry the remains of the handle and managed to snap the seacock shaft. . No leaks so far.
However it did brake too easilly and I am not keen in replacing it with another of the same type. Would like to use glass reinforced nylon replacement. I would like to source one before the next haul out and can't get the part out to check the thread myself.

[coopec43]

I don't follow the problem.

I assume the SD10 is a sail drive behind a Nanni Diesel?

But wouldn't the sea-cock be mounted on the hull? Any Boat chandler would have skin fittings with a suitable ball valve to replace your broken one.

My preference is SS but I note others prefer Marelon

https://www.google.com.au/search?q=s...w=1059&bih=587

[GordMay]

Greetings and welcome aboard the CF, coconha.

[coconha]

Yes, thanks for the welcome and excuse the the lack of details on the question.

The raw water intake does not come through the hull, rather through the saildrive. The seacock is threaded directly into the saildrive's aluminium body.

[coopec43]

Originally Posted by coconha

Yes, thanks for the welcome and excuse the the lack of details on the question.

The raw water intake does not come through the hull, rather through the saildrive. The seacock is threaded directly into the saildrive's aluminium body.

coconha

You'd probably be interested in this thread

http://www.cruisersforum.com/forums/...nt-189166.html

I can see now where the sea-cock fits the sail drive. Are you sure you can't buy a generic one that fits from the local boat parts outlet? (Ask them if it is OK to return it if it doesn't screw in)

There would be nothing really technical about them: they are just a tap)

[Dsanduril]

If you believe this manual from Vetus (that uses the SD10) - go way down to page 98 - it is a G1 thread. There is a G1 female thread in the block of the saildrive, then a G1-G1 male-male nipple threaded into the block, then a G1 stop valve. The final outlet connection is a G1 to 19mm hose barb, so if you have 19mm/3/4-inch hose then that might be a bit of confirmation.

G1 is a designation for a British Standard Parallel Pipe Thread, 1-inch nominal diameter, parallel thread type (as opposed to tapered pipe threads).

[Edit] if you want to go non-metallic you might try the TruDesign 90242 valve (despite the rant thread currently running elsewhere on CF). Use caution, plastic valves are generally much larger so getting it to fit in the space may be tricky [/Edit]

[coconha]

Thanks Dsanduril, that is exactly the answer I was looking for. The seacock looks identical to mine.

I wish the Nannidiesel or the ZF parts catalogue was as detailed as the Vetus one. The seacock on my SD10 has a "25" number engraved and the ZF parts catalogue is in Italian. It made me suspect it could be some unusual metric thread.

I am pretty confident it is the 1" BSPP now.

[coopec43]

Originally Posted by coconha

Thanks Dsanduril, that is exactly the answer I was looking for. The seacock looks identical to mine.

I wish the Nannidiesel or the ZF parts catalogue was as detailed as the Vetus one. The seacock on my SD10 has a "25" number engraved and the ZF parts catalogue is in Italian. It made me suspect it could be some unusual metric thread.

I am pretty confident it is the 1" BSPP now.

I'm quite sure that none of the through hull fittings have tapered threads.

[Dsanduril]

Originally Posted by coopec43

I'm quite sure that none of the through hull fittings have tapered threads.

It's not a through hull, it's a connection to the saildrive casting/block. My engine has a ton of tapered thread fittings for things like hoses, pressure senders, etc. so it's not always clear when it's an attachment to an engine whether it is parallel or tapered.

[coopec43]

Originally Posted by Dsanduril

It's not a through hull, it's a connection to the saildrive casting/block. My engine has a ton of tapered thread fittings for things like hoses, pressure senders, etc. so it's not always clear when it's an attachment to an engine whether it is parallel or tapered.

Not that it applies here but apparently female threads of gate/ball valves have tapered threads. From my rudimentary knowlegge that would make sense.
" Most all available ball valves or gate valves have NPT or tapered threads and most ..."

[Midnight Son]

The handle broke off in your hand! Porous!! Electrolysis anyone? I think you have a larger problem than just the Valve failing.
I am hoping to be wrong.
Best of luck

[coconha]

The first saildrive leg of this boat was lost to electrolisis by the previous owner. I understand it was a combination of wrong HF radio grounding and a leaky current from a berth neighbour.
The source of the problem was addressed and the leg replaced.
I suspect (and hope) the porous handle is old damage. At this stage, I dont have any reason to believe otherwise.
This seems to be changing the topic of the original question, but if you have any tipsfor me, they are most welcome.

[Midnight Son]

coconha The valve should have been replaced with the leg as it is attached! When you get the valve off, check further. Hate to have you fix this one issue, to have it come back and bite you, real hard.
Please take care.