Raw water filter is stuck...

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woodstock

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And another conundrum...

I tried to clear the raw water filter on my boat on sunday. It's bronze and has a bronze cap that unscrews from the top of the cylinder. But here's the problem - it's stuck! All I can do when I try and undo it is unscrew the fitting from the skin fitting - which isn't ideal!! Any tips of freeing bronze from bronze while the boat's in the water?
 
Two pipe wrenches, stilsons, chain wrenches etc, one to hold body and one for cap.

Alternative, shock - use a punch and hammer to tap it loose.

I'd apply Vaseline or grease after - to the cap not to you!
 
RawWater Filter is Stuck

Be careful! I had the same problem with the same sort of bronze filter housinng on mt last boat, also with a 1GM10. When I tried to force it, the inlet snapped off - below the seacock which was immediately adjacent! Fortunately the boat was out of the the water. You may not have the same arrangement in your boat of course, but if you do, take care! I fitted a new seacock and a plastic Vetus filter which was much easier to use.
 
Worth trying a hot air gun, or boiling water, to weaken the grip of the corrosion first ? Plus WD40 or Plus Gas (better). Allow it to soak in as the cap cools. Then the stillsons, with a couple of wooden plugs handy !
 
I have the same problem and solved it by turning the lever to the open position and using a thick block of wood to prop the lever off the nearby bulkhead and thus stop the body turning. I would not have room for the two stilson wrench trick even if I did have a set aboard.

It is important to be able, while at sea, to remove the top to clear this filter. Mine clogged on the way into Loch Ranza due to injesting jellyfish!
 
Raw Water filter......

Another vote for the plastic Vetus type raw water filter-easy to check for weed after each sail/motor nothing to corrode and set at about water level so easy to view and empty.
I was never happy with all the weight on the inlet fitting and the corrosion there. The Vetus is expensive but there may be alternatives available of the same type.
 
Sorry, a wee bit off topic but where can I get a replacement filter for my raw water, via mail order ( UK )

overall dia 35mm
overall length 200mm

002-28.jpg
 
ianat182 said:
Another vote for the plastic Vetus type raw water filter-easy to check for weed after each sail/motor nothing to corrode and set at about water level so easy to view and empty.
I was never happy with all the weight on the inlet fitting and the corrosion there. The Vetus is expensive but there may be alternatives available of the same type.
Click to expand...

A replaced my original bronze filter with a Vetus, or similar - not sure of the make, when I re-engined. Set it well above the waterline, very easy to clean, you don't have to shut off the sea cock, well pleased(and I sold the original on eBay).
 
M33 said:
A replaced my original bronze filter with a Vetus, or similar - not sure of the make, when I re-engined. Set it well above the waterline, very easy to clean, you don't have to shut off the sea cock, well pleased(and I sold the original on eBay).
Click to expand...

My Vetus filter is installed well above the waterline, as you suggest.

I have been told by a Yanmar mechanic that it should have been installed with the centre of the bowl on about the same level as the waterline. This makes sense to me, as it gives the raw water pump less work to do. I haven't moved it yet.

I would be interested to know what the conventional wisdom is?
 
JayBee said:
I have been told by a Yanmar mechanic that it should have been installed with the centre of the bowl on about the same level as the waterline. This makes sense to me, as it gives the raw water pump less work to do. I haven't moved it yet.
Click to expand...

Mine is installed so that the w/l is about 1/2" above the bottom of the filter and it works fine.

Another bonus with having the fiter high is that it's easy to flush through the engine with fresh water from a shore supply when winterising. No need to disconnect any piping. Simply take the top off the filter and let water into it from the hose. Excess water drains away down through the seacock.
 
woodstock said:
And another conundrum...

I tried to clear the raw water filter on my boat on sunday. It's bronze and has a bronze cap that unscrews from the top of the cylinder. But here's the problem - it's stuck! All I can do when I try and undo it is unscrew the fitting from the skin fitting - which isn't ideal!! Any tips of freeing bronze from bronze while the boat's in the water?
Click to expand...

I would dry out alongside a wall or against piles and take the whole thing off to do it. Tap a tapered softwood bung into the hole in the hull, in case you don't finish the job before the tide comes in.
 
I would try the heating method, worked on mine a treat, i found that the threads had been greased with non marine type grease and this in turn had gone very sticky and bound the threads. Heat it up until its kettle hot(it will cool quickly if the boat is in the water) then using two opposing stilson wrenches undo the top.

As to replacing it i think you will have some issues as the seacock you have has one 17mm hole through the hull and then three 6 mm ones around the outside to hold it in. You may Have to do some glassing to fill the outer holes.

Steve
 
Raw water filter...

My suggestion as to a Vetus replacement filter assumes that once the bronze housing has been removed a new seacock of the ball type is fitted and to this feed a bronze hose 19mm i/d hose is attached. The inlet hose(about 3ft long) then connects to the raw water pump housing ,and a short length to the filter(about 4" above water level in my boat)then the outlet from the filter to the engine itself. I paid £20 for my filter,and £6 for the seacock mentioned above.
When bits of weed sometimes clog the raw water inlet,it becomes a simple matter to clear using one of those wire brushes connected to a flexible curtain wire that will pass through the open seacock to the outside without letting water inside the boat, by raising the end above water level.
I have used a pressure pistol type pump for particularly difficult bladder weed blockages.

ianat182
 
ianat182 said:
My suggestion as to a Vetus replacement filter assumes that once the bronze housing has been removed a new seacock of the ball type is fitted and to this feed a bronze hose 19mm i/d hose is attached. The inlet hose(about 3ft long) then connects to the raw water pump housing ,and a short length to the filter(about 4" above water level in my boat)then the outlet from the filter to the engine itself. ianat182
Click to expand...

Surely the filter wants to go between the inlet and the pump? It's certainly like that on my boat. Otherwise you could find the raw water pump being damaged by weed or any other gubbins that is sucked up.
 
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