KAD 32 Raw water filter and Impellor - Will I sink

[Bigplumbs]

I am reading the KAD 32 instruction book that came with the boat and It is a bit confusing as it is combined with about 9 other engines. In the section about replacing the raw water impellor and cleaning the Raw water filter it suggests that water could enter the boat and I must close the Reverse Gear Seacock.

This is on a Sealine S24 With DP leg. Is this reference talking about something else as I don't get the whole Reverse Gear Seacock thing. Have I even got one.

Basically can I just clean the raw water filter and change the Impellor with the boat on the water or will I sink the moment I open the top of the raw water filter :O

Sorry for what is probably a very stupid question

 

[[2068]]

There is no seacock on an outdrive KAD32.
You will not sink if you clean the strainer and replace the impeller.

Well, I didn't sink.

But if you undo the hose from the outdrive that feeds the seawater pump and drop it, you will definitely sink.
So don't do that.

Also, probably a good idea to wait some time after running the engine before doing it.
I found that if I took the strainer cap off immediately after running the engine, water went everywhere, mostly over the alternator.

.

 

[simonfraser]

+1

as long as the opening is above the water line and there is no siphon loop - which there should not be, you'll be ok

pull the impelor out with some thin nosed pliars, make a note of which way the vanes fit in, i put mine back in with some grease

if you get salt water over the engine / alternator rinse it off and spray with ACF-50

 

[Bigplumbs]

+1

as long as the opening is above the water line and there is no siphon loop - which there should not be, you'll be ok

pull the impelor out with some thin nosed pliars, make a note of which way the vanes fit in, i put mine back in with some grease

if you get salt water over the engine / alternator rinse it off and spray with ACF-50

Many thanks for this and it all makes sense. Especially cleaning the raw water filter which is my first job as this should be cleaned regularly. Just that the KAD 32 Book said risk of water penetration and this thing about the reverse gear seacock... Extract attached

Dennis

 

[oldgit]

Advice about closing the raw water intake valve before doing anything to cooling system is really for shaft drive boats. It is good idea however and the older the boat the more important, to make sure the valve handle/ wheel is actually able to shut valve. Due to the daft locations of many seacocks , hidden away out of plain sight, they become difficult/ impossible to shift without considerable force due to lack of use.This could result in the handle detaching itself from the shaft. Replacement valve is boat out job which might ruin your day a bit. Just turning them on and off every so often does the trick. Not all shaft boats are the same, on my old Broom you could clean filter with valve open, on my Princess, try the same trick and you will be in Davy Jones locker in no time .

 

[Bigplumbs]

Advice about closing the raw water intake valve before doing anything to cooling system is really for shaft drive boats. It is good idea however and the older the boat the more important, to make sure the valve handle/ wheel is actually able to shut valve. Due to the daft locations of many seacocks , hidden away out of plain sight, they become difficult/ impossible to shift without considerable force due to lack of use.This could result in the handle detaching itself from the shaft. Replacement valve is boat out job which might ruin your day a bit. Just turning them on and off every so often does the trick. Not all shaft boats are the same, on my old Broom you could clean filter with valve open, on my Princess, try the same trick and you will be in Davy Jones locker in no time .

I have been told on the sealine forum that I don't have one on my Sealine S24 with DP Leg and cant see one. But all rather confusing

 

[[2068]]

"There is no seacock on an outdrive KAD32"

 

[petem]

"There is no seacock on an outdrive KAD32"

+1. Anything relating to "Reverse Gear" in your manual can be ignored as it relates to shaft drive versions of the engine. My KAD44 manual is confusing in the same way.

 

[stelican]

Early 290DP drives had a seawater shut off valve mounted inboard on the transom shield.
Switch off engine prior to cleaning filter.

 

[julians]

I've always wondered why outdrive don't have a shutoff valve in the raw water intake, it seems like a significant risk of flooding if one of the hoses below the water line springs a leak? Or am I missing something which means it's a low risk.

You don't seem to hear of many boats suffering from this problem

 

[[2068]]

Could be that with an outdrive install, it’s VP stuff along the water path. Very thick hoses, double clipped. An inboard install - boat builder could have done anything?

 

[stelican]

I've always wondered why outdrive don't have a shutoff valve in the raw water intake, it seems like a significant risk of flooding if one of the hoses below the water line springs a leak? Or am I missing something which means it's a low risk.

You don't seem to hear of many boats suffering from this problem

I removed the shut off valve on mine blanked off the fitting and fitted a more accessible through hull and two way ball valve.
The two way ball valve allowed the seawater pump of the engine to be used as an emergency bilge pump, also fitted a freshwater flush in the cooling line. Bit overkill but completely open centre console.

 

[Momac]

am I missing something which means it's a low risk.

You don't seem to hear of many boats suffering from this problem

Must be very low risk then .............................. Or no survivors ?

 

[QBhoy]

You don’t have a seacock for sure. Cleaning the filter will certainly not see ingress of water on that boat and engine and most unlikely will it do so changing the impeller.
Only know because I’ve done it and to put your mind at rest even further...should you leave the lid off the strainer, not even the running engine driven water pump will pull water through the system, so unlikely to siphon, haha. I know this from a failed attempt at trying to pump antifreeze round the raw water system with the lid open. Antifreeze poured into filter didn’t disappear until the lid was put on.