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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #1  
Old 03-28-2012
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Raw water circuit

The first picture shows the hose that is connected to the raw water pickup of the engine going into a manifold of some kind beneath the gearbox.
I don't know what that red thing is. It is a plastic tab that slides over the hose anyplace you want to put it.

What is the story with this design?
Are there any maintenance issues with this setup?


The second picture shows the raw water hose not quite making it to the through hull. I did not decommission this boat so am I right is guessing that someone misplaced and elbow somewhere?
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Old 03-28-2012
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Re: Raw water circuit

david :

The connection to the gearbox looks like the coolant feed to the gearbox.
From there, it will probably meet with the coolant pump, then to the motor coolant jacket.
Take some more pictures of what is next in the coolant circuit.
What is the motor? Is it raw water cooled or is there a heat exchanger somewhere?
I would not worry much about the red tab.
You have to feed coolant. That hose must be connected to the through-hull.
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Old 03-28-2012
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Re: Raw water circuit

Quote:
Originally Posted by davidpm View Post

I don't know what that red thing is. It is a plastic tab that slides over the hose anyplace you want to put it.
I think the "little red thing" is the protective sleeve for inserting the shaft into the shaft seal, or the seal over the shaft. If so, it should have a split in it to be able to remove it after use.

It looks like the one I have for when/if I have to remove and replace the shaft, or for initially fitting the shaft seal.

Am I right in thinking that you have a Volvo rubber seal at the end of the stern tube, with the shaft running through it?

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Old 03-28-2012
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Re: Raw water circuit

Quote:
Originally Posted by Rockter View Post
david :

The connection to the gearbox looks like the coolant feed to the gearbox.
From there, it will probably meet with the coolant pump, then to the motor coolant jacket.
Take some more pictures of what is next in the coolant circuit.
What is the motor? Is it raw water cooled or is there a heat exchanger somewhere?
I would not worry much about the red tab.
You have to feed coolant. That hose must be connected to the through-hull.
Yes there is coolant reservoir.
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Old 03-28-2012
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Re: Raw water circuit

Quote:
Originally Posted by PhilipStevens View Post
I think the "little red thing" is the protective sleeve for inserting the shaft into the shaft seal, or the seal over the shaft. If so, it should have a split in it to be able to remove it after use.

It looks like the one I have for when/if I have to remove and replace the shaft, or for initially fitting the shaft seal.

Am I right in thinking that you have a Volvo rubber seal at the end of the stern tube, with the shaft running through it?
It is a Volvo and the red sleeve sure looks exactly the same. Next time I'm at the boat I'll double check. Thanks
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Re: Raw water circuit

Now that Philip told me what to look for I found this.
http://www.volvopenta.com/SiteCollec...ox%20(Eng).pdf

I have to take another look to be sure but I'm pretty sure that is what I have.
If this exists why don't everyone use them. It seems a lot simpler than the traditional stuffing box with a tighting nut and packing.
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Re: Raw water circuit

I'm still looking for a little more understanding on picture 1 where the hose at the top with the red tag is cumming from the through hull and goes into a fitting below the transmission then exits through the ridged tube at the bottom of the picture and on to the raw water impeller at the front of the engine.

That looks odd to me. It looks like the transmission is raw water cooled, is that possible.
If it is I would think that there is some service required but can not find anything about it.
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Re: Raw water circuit

I'm still missing something in picture 2 where the raw water intake hose seems to be too short to reach the through hull.
It is unlikely that the hose is too short so there must be another part that connects the two. Any idea what I'm looking for?
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