water leak from motor

[scoflaw]

It's a drain not a feed. Plug the block and those 2 #10 hoses. It's a gen 1 sbc, been in production for over 60 years. It's not cooled by its drain plugs.

Merc customer support would be glad to email you a flow diagram.920-929-5040
I have that flow manual and it's calling #10 "drain hoses"

 

[True North]

ok thank you, I will look into Merc support as well. The part that still confuses me by what you are telling me is I know that may be a drain- or part of the drain system, but when the hose was disconnected from the male connection on the block due to the push lock fitting being broke, the circulating pump was obviously pumping water through that small hose (part #10 as seen above) -from the hose towards the block, not the other way around? This water was under pressure as there was a steady stream coming out of it and filling my bilge up with water- this wasn't just draining the motor and it only pushed water through with the engine running i.e. pump circulating. To the point that as I was limping the boat back to the dock my bilge pump was pretty much running the whole time to keep up with the water in the bilge. So that leads me to believe there is a purpose of that water to cool the block, however I kept a close eye on the temp gauge and felt the risers/motor by hand it all felt "normal" i.e. no overheating.

From what you explain the hose is in place to allow water to flow from the bottom of the block to the drain system to the lowest point drain i.e. blue plastic valve on port side. But how can that be the case if when connected and engine running the water is being pumped the opposite direction from the hose into the block? It doesn't make sense to me, sorry if I am beating a dead horse, but I just don't want to take a chance of closing off part of the system for fear of overheating issue until I fully understand it. It makes no sense to me why water would be circulating through that hose towards the block but not really needed??? Especially since I did not see any bypass system in place.

Thanks again

 

[scoflaw]

If I had to guess at this, I would say the pressure in that large feed line those 2 block drains go to, part 9, is equal to the water pressure in your block, so there is no flow. Let the Merc boys explain this to you, you will probably believe them.

 

[Ididntdoit]

+1 - I just put a new motor in and eliminated these hoses and plugged the holes - they were always a bitch to detach and reconnect when winterizing.....plugs will be easier to remove

 

[Espos4]

ok thank you, I will look into Merc support as well. The part that still confuses me by what you are telling me is I know that may be a drain- or part of the drain system, but when the hose was disconnected from the male connection on the block due to the push lock fitting being broke, the circulating pump was obviously pumping water through that small hose (part #10 as seen above) -from the hose towards the block, not the other way around? This water was under pressure as there was a steady stream coming out of it and filling my bilge up with water- this wasn't just draining the motor and it only pushed water through with the engine running i.e. pump circulating. To the point that as I was limping the boat back to the dock my bilge pump was pretty much running the whole time to keep up with the water in the bilge. So that leads me to believe there is a purpose of that water to cool the block, however I kept a close eye on the temp gauge and felt the risers/motor by hand it all felt "normal" i.e. no overheating.

From what you explain the hose is in place to allow water to flow from the bottom of the block to the drain system to the lowest point drain i.e. blue plastic valve on port side. But how can that be the case if when connected and engine running the water is being pumped the opposite direction from the hose into the block? It doesn't make sense to me, sorry if I am beating a dead horse, but I just don't want to take a chance of closing off part of the system for fear of overheating issue until I fully understand it. It makes no sense to me why water would be circulating through that hose towards the block but not really needed??? Especially since I did not see any bypass system in place.

Thanks again

Don’t over think it.
Just like Scoflaw stated, put a plug in the block and plug that hose and you’re good to go.

The circulating pump in the front of the motor (conventional automotive water pump looking thingy) is what circulates the water through the block using the passageways in the cylinder head and the opening in the front of the engine block.

 

[True North]

All good, I will go that route. It just concerned me when I noticed the water flowing out of the hose with force vs the other way, wanted to be positive before I did something I would regret! Thank you all for the information, especially Scoflaw!

 

[scoflaw]

Thanks, you may want to think about replacing the rest of the plastic crap on that system, that distribution housing piece is a known weak point. Cracks easily

 

[Wanderer 290]

Maybe pull up a raw water plumbing diagram without the winterizing option and re-plumb accordingly. Probably would need a couple plugs and a couple petcocks.

 

[Ididntdoit]

Thanks, you may want to think about replacing the rest of the plastic crap on that system, that distribution housing piece is a known weak point. Cracks easily

Not to Hijack, but do you have the proper hose routing and/or part numbers to get rid of all the single point drain stuff on a RWC motor- not sure what to do with the exhaust manifold hoses, etc and what needs to be hooked up where

 

[scoflaw]

Not to Hijack, but do you have the proper hose routing and/or part numbers to get rid of all the single point drain stuff on a RWC motor- not sure what to do with the exhaust manifold hoses, etc and what needs to be hooked up where

That could get expensive, but doable. Order all the molded hoses for a cf2 system from the ps cooler forward, and you would need a t-stat housing from that era.

Would be cheaper to get rid of some of the single point weak links. Like already mentioned. I believe member BT Doctur is making the distribution housing out of copper and selling them.

 

[Ramsey0071]

new to me boat has sprung a leak (2005 SR 260DA with 350 MAG MPI, B3). After close review I am able to determine where it is coming from, however I'm not sure how to go about repairing it. I forgot to take a pic and the boat is now 150 miles away again, so pls bear with me+ I am just now getting familiar with the boat since I have only had it since July 3rd

It is on the starboard side of the motor, on the bottom of the block, down low, right above the oil pan, centrally located, right behind (aft) of the fuel pump/filter "black box". It looks like the older style freeze plugs. It's got a threaded brass part that looks like it's screwed into the block, but has a small diameter hose leading from it. It sits behind a bunch of other water hoses (larger ones). It appears there is one similar to it on the port side of the motor as well. I assume it is part of the cooling system (fresh water cooled). It only leaks when the boat is running i.e. circulating cooling water. I verified it both on the muffs on the trailer and in the water. I can't tell for certain if it is actually leaking from the threads into the block (it appears there may be some type of plumbers putty or some sort of sealer on it) or the hose that is attached to it. There are no hose clamps on either one (port or starboard) so my guess is not a high pressure water route or forgot to put clamps on from the factory??? I will have to remove other hoses in front of it to gain proper access.

So who can tell me what those are and how I should go about trying to repair it? I'm worried about if it is a cross-threaded situation of a plug from the factory-boat only has 300 hours on it. It didn't leak during sea-trial??? It causes enough water in the bilge to run the bilge pump every so often. I have continued to use it with the leak as it doesn't appear to be impacting operating temp. Does anybody have a water-cooling diagram resource of what this could be?

Sorry so detailed, but without a pic wanted to provide as much info. Thank you in advance.

 

[Ramsey0071]

I have a leak similar to what you are describing here's a pic..
Can I get some direction? Hoping it wasn't a freeze plug, leaks while running with muffs and water come out of the bilge pump without turning the pump on

 

[Ramsey0071]

I have a leak similar to what you are describing here's a pic..
Can I get some direction? Hoping it wasn't a freeze plug, leaks while running with muffs and water come out of the bilge pump without turning the pump on

 

[scoflaw]

Looks like the distribution housing but the big hose in the way makes it tough to tell exactly. Common breakage area though, go get another one, cheap enough.

 

[Ramsey0071]

Looks like the distribution housing but the big hose in the way makes it tough to tell exactly. Common breakage area though, go get another one, cheap enough.

Thanks man I'll try and get a better pic.
They usually split right in the middle?

 

[Ramsey0071]

OEM MerCruiser Water Distribution Housing .
Anyone know the part number for 2020 spx 190 or link 4.5/ 200 appreciate it there are so many air acutied ???

 

[Ramsey0071]

Looks like the distribution housing but the big hose in the way makes it tough to tell exactly. Common breakage area though, go get another one, cheap enough.

Would you happen to have a link or product number I've looked and narrowed it down to two options.

 

[scoflaw]

mercruiserparts.com , put in your engine number then go to the page, part numbers will be there.