Pretty good water leak after solid mount install

[MWB]

Just installed solid mounts and I have a good pressurized stream of water shooting from the port side top mount. This is not the noraml dripple of water this is a stream. Reading here some suggest o-rings on the solid mounts, the question is where do they go?

Would this stream be caused by a damaged/torn exhaust gasket or the solid mount? Should I use some rtv around the mounts and bolt it back together?

What do you guys think?

[Ray Neudecker]

You need to revisit your gasket installation. Not sure what o rings would do on the mounts.

[rock]

The o-ring, as some call it, is really a rubber flat washer that slides over the mount on the engine side tween the plates. That washer plus a touch of sealent will stop your leak.
Rock

[MWB]

Thanks Rock

Any idea on the size of the washer. Does it need to be the same size as the mount on the motor side or should it be larger?

[transomstand]

http://i221.photobucket.com/albums/dd58/transomstand/clamp.jpg

P/N 66921 from Merc




.

[RiceKiller]

I have always rubbed Silicone all over the mounts Before i install them and never used the rubber gasket washers and never had a leek

[Bruster]

You need to revisit your gasket installation. Not sure what o rings would do on the mounts.

The rubber washers are just bumpers and they have nothing to do with sealing the mounts. You need to look at your adapter halves and make sure they are flat so the gasket can seal properly. There shouldn't be any cooling water that touches the mounts on the way to the powerhead. Nowhere does the Mercury manual instruct to "seal" the mounts with silicone or any other type of sealer during assembly. Now if you put a dab of sealer on the mounts with the intention of keeping saltwater out of the mount cavity, that could be understood. End of story.

[TEXAS20225]

if you have water squirting out any where the gasket has not sealed !!!to run unrepaired will be a mistake my .02

[transomstand]

Nowhere does the Mercury manual instruct to "seal" the mounts with silicone or any other type of sealer during assembly. End of story.

I'm sorry, that is incorrect.

http://i221.photobucket.com/albums/dd58/transomstand/mounts-1.jpg

[rock]

Thanks Pete. I was confused since I just fixed a leaker by putting the rubber washers in with a little sealent. Thought it might have been a fluke for a second there.
Rock

[croSSed]

I'm sorry, that is incorrect.

http://i221.photobucket.com/albums/dd58/transomstand/mounts-1.jpg

Which manual is this from? Those pics don't exist in mine (factory manual).

TG

[transomstand]

Which manual is this from? Those pics don't exist in mine (factory manual).

TG

Something old (all my stuff is old):D

Published 1990, covers mid 1980's to 1990 V-6

The number on it is 90-814098--1 190

[Bruster]

I stand corrected, however... The sealant (Perfect Seal) isn't to keep the cooling water out of the mount area, the gasket does that, and that is what we are talking about here, right? The perfect seal is to keep the seawater (saltwater) out. If you look further you will see they say to put perfect seal on the bearing carrier and retainer nut on your lower unit too. Helps when the next guy takes it apart.


I'm sorry, that is incorrect.

http://i221.photobucket.com/albums/dd58/transomstand/mounts-1.jpg

[transomstand]

I stand corrected, however... The sealant (Perfect Seal) isn't to keep the cooling water out of the mount area, the gasket does that, and that is what we are talking about here, right? The perfect seal is to keep the seawater (saltwater) out. If you look further you will see they say to put perfect seal on the bearing carrier and retainer nut on your lower unit too. Helps when the next guy takes it apart.

And the prop shaft too:D

In the case of the engine described in this thread, the primary problem is the gasket, the author stated that belief himself, and no one disagreed. He requested information about the orings/washers and it was provided. If the purpose of those washers was to keep water out, rather than provide a secondary seal to the gasket, why are they so deep in the adapter? Why not in front of the mount, and why have so many "dribblers" been cured by installing them?

I have to say, if the purpose of that design is to keep salt out, it is a dismal failure, I've seen motor mount cavities literally filled with salt on more than one occasion.

[Bruster]

Explain how those rubber washers could ever seal anything. The only function of the rubber washer is to act as a bumper between the fixed and movable parts of the engine and serve no use what so ever when the solid mounts are installed.



And the prop shaft too:D

In the case of the engine described in this thread, the primary problem is the gasket, the author stated that belief himself, and no one disagreed. He requested information about the orings/washers and it was provided. If the purpose of those washers was to keep water out, rather than provide a secondary seal to the gasket, why are they so deep in the adapter? Why not in front of the mount, and why have so many "dribblers" been cured by installing them?

I have to say, if the purpose of that design is to keep salt out, it is a dismal failure, I've seen motor mount cavities literally filled with salt on more than one occasion.

[specboatops]

Great info Pete:thumbsup: ....always helping.......:thumbsup::thumbsup:

Chris

[transomstand]

Explain how those rubber washers could ever seal anything. The only function of the rubber washer is to act as a bumper between the fixed and movable parts of the engine and serve no use what so ever when the solid mounts are installed.

I suppose I can't, I can't explain why a paper gasket would seal anything either. It would seem reasonable that a rubber washer, held against the the gaps in metal parts by a steel washer, would provide some sealing benefit.

If rubber washers are required only for cushioning the movement of the rubber mounts, why would they not be used on the lowers?

[Bruster]

If you look at the washers you may notice they just hang loose on the mount, they are not held against the gaps. I suppose the reason they aren't required on the lowers is the lower mounts are twice the size of the uppers. I would also think the lowers act more as a pivot point forcing the upper mounts to move when under power. Look at how a motor with rubber mounts moves when under hard acceleration, it moves back, the spacer then becomes pinched between the mount and big steel washer so there is no metal to metal contact.


I suppose I can't, I can't explain why a paper gasket would seal anything either. It would seem reasonable that a rubber washer, held against the the gaps in metal parts by a steel washer, would provide some sealing benefit.

If rubber washers are required only for cushioning the movement of the rubber mounts, why would they not be used on the lowers?

[transomstand]

How come they'll seal your entry water, but they won't seal my exit water:p:D:D

I'm also not saying they won't cushion movement of the bolts.

Any time I've done a mount install, the rubber washers seemed pretty snug, the flat washers seemed to compress them a bit.

The other thing to consider, is the condition of the exhaust plates we're using. The stuff in my inventory is not exactly pristine. Even if the sealing benefit is unintentional, if it helps a beat up plate not dribble water, I'm happy to accept it.