1GM water issues

[olly_love]

Just fitted a new head and elbow to our 1gm10,
now we get a lot of exhaust pressure which is great however with our new tides series one seal( water injected)
we dont get any water over the siphon unless we lower the siphon,

new impeller installed checked the water pressure,

im going to try a non return valve in the injection line but think this will just create more issues

anythoughts?

 

[Tranona]

Have you checked and cleaned all the waterways and hoses, particularly the vertical one after the pump and the T union into the block? These get deposits in them that seriously reduce water flow.

 

[olly_love]

yep cleared all these,
it was a bit clogged but no better

 

[Tranona]

How is your antisyphon valve and feed to the seal laid out? The norm would be the valve first in the water pipe from the engine to the injection point and the T for the water feed between the valve and the injection. That way the valve prevents syphoning from both the exhaust and the stern tube. The valve needs to be above the waterline.

 

[olly_love]

So the latest is we have taken the feed from just the impeller and still it doesnt lift over the syphon!,
i have tryed the cover on both ways to check for scoring,
time to take the tides seal out

is there anyone else who has a 1gm and a tides seal?

 

[VicS]

How is your antisyphon valve and feed to the seal laid out? The norm would be the valve first in the water pipe from the engine to the injection point and the T for the water feed between the valve and the injection. That way the valve prevents syphoning from both the exhaust and the stern tube. The valve needs to be above the waterline.

Is this right. If the connection for the seal is between the anti-siphon valve and the exhaust injection point won't it be able to fill the exhaust system and then overflow into the engine ?

 

[VicS]

So the latest is we have taken the feed from just the impeller and still it doesnt lift over the syphon!,
i have tryed the cover on both ways to check for scoring,
time to take the tides seal out

is there anyone else who has a 1gm and a tides seal?

If you are saying that the pump does not develop enough pressure to push water over the antisiphon loop when there are no restrictions and no water peeing out anywhere else then surely the pump is knackered.

If its not going over the loop with the Tides seal not connected then removing the Tides seal is not going to help.

 

[Tranona]

Is this right. If the connection for the seal is between the anti-siphon valve and the exhaust injection point won't it be able to fill the exhaust system and then overflow into the engine ?

I stand corrected. The installation instruction say T off from the pressure side before the anti syphon.

 

[olly_love]

If you are saying that the pump does not develop enough pressure to push water over the antisiphon loop when there are no restrictions and no water peeing out anywhere else then surely the pump is knackered.

If its not going over the loop with the Tides seal not connected then removing the Tides seal is not going to help.

It does push over though with great pressure!,
i wouldn't be so confused about this if there wasn't an identical boat with the same setup and no issues?

got to be the seal taking too much however marine power/tides say there isnt an issue

 

[VicS]

It does push over though with great pressure!,
i wouldn't be so confused about this if there wasn't an identical boat with the same setup and no issues?

got to be the seal taking too much however marine power/tides say there isnt an issue

If the pump is developing "great pressure" then there is a restriction somewhere !

If the seal is "taking to much" then the pressure will fall to a low level.