New raw water inlet for engine.

[robertager1962]

Hi all

I am fitting a new raw water inlet for my engine and was planning to put a Vetus strainer in the engine bay.
I currently have a bronze, pot type filter fitted which will no longer fully close off the seawater.
The Vetus strainer needs to be above sea level and the issue I have is the seawater supply to my lipseal on the prop shaft will need to be placed between the sea water inlet and the new Vetus filter, meaning the water to the lip seal is unfiltered.
Can anyone offer advice please.

 

[Keith-i]

I have a Vetus filter but it is not above the water line, it sits about midway above. I’m surprised you have a lipseal drip feed coming off the raw water inlet as I would have thought the engine impellor would create negative pressure and draw water up the feed pipe. This may not be a problem of course if the lipseal just needs venting rather than a supply of water.

 

[ChromeDome]

My Vetus strainers are slightly above the waterline - can remove the lids [Edit: with] without water flowing out.

Water to lube the shafts is taken off the impeller-pressurized side of the flow.

 

[robertager1962]

Many thanks. My lip seal does not have a pressurised feed. It is a Tidesmarine Lip Seal and I guess the supply is a way to equalise the internal pressure between the outer and inner seal.

 

[robertager1962]

I have a Vetus filter but it is not above the water line, it sits about midway above. I’m surprised you have a lipseal drip feed coming off the raw water inlet as I would have thought the engine impellor would create negative pressure and draw water up the feed pipe. This may not be a problem of course if the lipseal just needs venting rather than a supply of water.

Thanks Ķeith. Just checked and actually have a Seaflo filter and the instructions do say that it needs to be fitted above the waterline. I have a TidesMarine lip seal and the supply pipe is just to equalise the pressure (so not.pressure fed)

 

[VicS]

Many thanks. My lip seal does not have a pressurised feed. It is a Tidesmarine Lip Seal and I guess the supply is a way to equalise the internal pressure between the outer and inner seal.

It should have a pressurised water feed .

This is an extract from Vyv Cox's website

 

[B27]

If possible, fit the strainer so you can poke something right through to the skin fitting.
Ideally a straight hose, but a curve is OK.
I once had to clear a plastic bag from the inlet using a flexible sail batten.

 

[robertager1962]

It should have a pressurised water feed .

This is an extract from Vyv Cox's website

View attachment 162055

..and this is why I value the help of this forum. You are absolutely right and now I understand what is going on! It also makes my job easier as the raw water is also filtered. Thank you so much!

 

[Tranona]

This is the installation instructions for the seal.
https://www.tidesmarine.com/shop/pr...haft-seals-kits/seriesone-3-4/#product-tabs|4

 

[robertager1962]

This is the installation instructions for the seal.
seriesOne 3/4" - Tides Marine | Marine Industry Products

Thanks very much.

 

[vyv_cox]

It should have a pressurised water feed .

This is an extract from Vyv Cox's website

View attachment 162055

Thank you Vic.