See Pics Leaking seam between lower unit to upper

[chrisjt]

Need Help! Reinstalled my lower unit, water leaking between lower unit and upper. How do i fix it? :blue:

 

[metriccrescentwrench]

Re: Leaking seam between lower unit to upper

Re: Leaking seam between lower unit to upper

If you mean between the lower unit and midsection, that's normal. There's no seal there, the midsection fills with water in use, and it has to drain. There probably are a couple of drain holes there as well.

 

[JDusza]

Re: Leaking seam between lower unit to upper

Re: Leaking seam between lower unit to upper

Man, you are so close...
Sounds like the water tube has missed the water pump when the lower unit was re-installed.
Gonna have to drop the lower unit again and realign the water tube to the top of the water pump.
It is a little tricky because you have to make the alignment and try to "catch it" before the "big push" and you don't have a lot of room to see, so you're working blind for a bit.
J

 

[Faztbullet]

Re: Leaking seam between lower unit to upper

Re: Leaking seam between lower unit to upper

If its peeing and cooling correctly its fine and normal for this as stated previously as its a metal to metal mating surface.

 

[chrisjt]

Re: Leaking seam between lower unit to upper

Re: Leaking seam between lower unit to upper

My I have your opinion again after seeing pics, THANKS!!

 

[chrisjt]

Re: Leaking seam between lower unit to upper

Re: Leaking seam between lower unit to upper

The stream of water on the left and right side of the lower unit. Is that excessive???

 

[Bosunsmate]

Re: See Pics Leaking seam between lower unit to upper

Is any water coming out your props exhaust?

 

[chrisjt]

Re: See Pics Leaking seam between lower unit to upper

No water coming out props exhaust.

 

[Bosunsmate]

Re: See Pics Leaking seam between lower unit to upper

Well i just changed a v4 waterpump two weeks ago and it wasnt doing that

 

[bonzoscott]

Re: See Pics Leaking seam between lower unit to upper

That does look excessive, enough to make me pull it apart again. The way it's spraying outta there, all drain holes would have to be plugged and fill the leg to create pressure.

 

[Faztbullet]

Re: See Pics Leaking seam between lower unit to upper

The way it's spraying outta there, all drain holes would have to be plugged and fill the leg to create pressure.

Sorry but cant happen...the whole top of lower unit would have to be sealed off for this. You can loosen all the bolts and tighten the alignment bolts first which are port rear and starboard front then the remainder. A lot a persons do not know that OMC units have alignment holes. If you look these 2 holes will be smaller in the lower housing casting vs the other 2 since no alignment pins like a Mercury. Also pitts and missing paint will cause what you seeing, tighten bolts as above and run a few times and retighten as you have no problem.

 

[metriccrescentwrench]

Re: Leaking seam between lower unit to upper

Re: Leaking seam between lower unit to upper

My I have your opinion again after seeing pics, THANKS!!

In the first photo there's a very strong tell-tale stream, so the power head obviously has plenty of water pressure.

Also, since it's running on muffs in these photos you gotta' realize that the midsection is being pressurized by your hose.

The way it's spraying outta there, all drain holes would have to be plugged and fill the leg to create pressure.

If that's the case those drain holes could be easily cleaned out with a drill bit (held in your fingers).

edit to add: I was posting the same time as Faztbullet - I like his suggestion to retighten the bolts after a few runs.

 

[chrisjt]

Re: See Pics Leaking seam between lower unit to upper

After lowering the lower unit today 1 inch to try to get a better seal and then put it back together, when i started the motor today water is now coming out the prop exhaust.

 

[Bosunsmate]

Re: See Pics Leaking seam between lower unit to upper

Is it leaking less?

 

[chrisjt]

Re: See Pics Leaking seam between lower unit to upper

Leaking the same. I don't know what to do.

 

[rothfm]

Re: See Pics Leaking seam between lower unit to upper

The pics do not show any flow out the ports (series of holes/slots) at the Cav plate? That spray looks excessive. water does seem, and at times flow at that seem, but never seen one "spray" out that far. If it is still doing that, its wierd. If your cooling ok, got prop flow, and some out those holes---You might try a bit of indian shellack at that seam when apart. I do that to avoid the exhaust "stains" on the white housing.

But spraying out that far isnt normal unless the mating surfaces are in bad shape and have gouges/channels to let the water fly out.

 

[Bosunsmate]

Re: See Pics Leaking seam between lower unit to upper

Leaking the same. I don't know what to do.

Id suggest dropping it again, bit of a chore when you have just done it but nice to know its working alright when you are out on the boat and you have something to get home for.
If you drop it again have a look at the rubber mount that seals in the exhaust gaskets, i gasket glue mine in so they dont get moved out of place during reinstall.
Also run a hose on to the water intake pipe and check that water is circulating around the engine ok and isnt coming down somewhere untoward like the shift shaft area

 

[Chinewalker]

Re: See Pics Leaking seam between lower unit to upper

Is the water warm or cold? If warm, I'd bet the rubber gasket that seats the exhaust tube into the top of the lower unit is pinched and you're seeing exhausted water leaking out the side. Easy enough to fix by either reseating the gasket or replacing it entirely. Not a huge problem, but it may make the motor louder.

 

[chrisjt]

Re: See Pics Leaking seam between lower unit to upper

Thank you all for the advice and help it is extremely appreciated. I will try a combination of all the above.

 

[phillnjack2]

Re: See Pics Leaking seam between lower unit to upper

Looks to me like you have massive amount of water pressure on the muffs for tell tale to be so strong !!!!
and looking at it again i see the engine is revving a bit high.
if the water pressure is this high then the spray from the leg is ok.
no way is it bad water tube from th pump,but it could easily be the rubber gasket to exhaust eith not fitting or not even there at all.

take it down and check it properly,1 inch down tells nothing as you cant see a thing untill its off the engine.


phill