Water fed stern gland

[nimbusgb]

I have a stern gland that is fed from a sea water pump similar to the engine cooling system.

Does anyone know just how much water is required to keep these glands running properly?

My engine ( perk 4-108 ) is fitted with a dual chamber,dual impeller jabsco type pump driven off the end of the camshaft. On reflection I am beginning to think that the pump is so worn ( gasket faces ) that it would benefit from replacement. Jabsco no longer make this pump and cant even identify it so I am going to have to either go with a single high capacity pump or rig up a dual system /forums/images/graemlins/frown.gif

It would be nice if I could split the output of a new single pump to feed both the heat exchanger and the stern gland.

 

[Oldhombre]

Just enough water to flush out any silt in the gland. Problem with splitting output from one pump is if. for any reason the stern gland does get at all blocked with silt mud or whatever, the pressure would direct to the "other" side and not flush out the gland.

 

[nimbusgb]

Thanks.

A differential pressure gauge with a probe in each leg would quickly highlight a flow failure to the stern gland I suppose. Easier than rigging twin pumps.

On the other hand ...
How about flushing the stern gland via an electric pump on with the engine 'ignition' leaving the engine driven one for the cooling alone ?

 

[MoodySabre]

I have a Tides Marine Seal like this and the flow rate is 4 litres a minute at idle.

I split my raw water intake with a T off to the seal - seems to be OK. Initially I didn't do the flow test but after the overheat alarm went I checked it and had to restrict the flow to the seal by putting a jublee clip round the feed and tightening until the flow was right.

 

[JimC]

You can use a single pump. The stern gland does not require a high volume of water flowing through it - just enough to keep the bearing surfaces consistently wet.

 

[jax]

Hi Ian

Our boat in the Med has a direct supply from the through hull for the engine to the stern gland - no pump and no problems. As you are aware when we catch and pass you!

 

[nimbusgb]

[ QUOTE ]
You can use a single pump. The stern gland does not require a high volume of water flowing through it - just enough to keep the bearing surfaces consistently wet.

[/ QUOTE ]

/forums/images/graemlins/smile.gif the stern gland is about .5 m below the water, it should be wet /forums/images/graemlins/smile.gif

[ QUOTE ]
Our boat in the Med has a direct supply from the through hull for the engine to the stern gland - no pump and no problems. As you are aware when we catch and pass you!

[/ QUOTE ]

Not any more /forums/images/graemlins/smile.gif With the new kiwi and a clean bottom you'll have a race on your hands /forums/images/graemlins/smile.gif

 

[essexboy]

Hi ASAP Supplies in Beccles (Do mail order) keep new pumps for Perkins 107/108 Pt No 209781 £101.43p tip for Jabsco dont forget the rubber sealing washer on the end of the shaft, as it makes a big change to flow !