Riser R&R

[FreeBeeTony]

Removed the starboard riser last night.
Definitely needs to replaced, hard to tell if the gasket was leaking after removal of the riser.
Couldn't get a good pic of the inside but there was a lot of "debris" inside when looking into the exhaust side.
I"m wondering if this caused blockage and caused the raw water to back up and put pressure on the block-off gasket.
The gasket seemed to be pushed-out on the manifold side (not sure if this makes sense).

 

[HT32BSX115]

Howdy,


The engine looks closed cooled........... That's a heat exchanger in the picture?

If so, the gasket will be a "Block-off" gasket which would prevent raw water from getting into the manifold.

If the riser(s) is(are) clogged, it will absolutely place pressure on the block-off gaskets, your risers will run pretty hot and the rubber exhaust parts would also run hot and/or burn.

I would be planning to replace both risers and inspect all the rubber couplings, flappers etc.........

 

[FreeBeeTony]

Yes, it is a full FWC system, forgot to mention that.
Don't think the riser was fully blocked, no burnt rubber pcs.
Should have referenced this thread:

http://forums.iboats.com/forum/engi...utdrives/9993302-mercruiser-oem-riser-gaskets

 

[FreeBeeTony]

Removed Port Riser today.
Think this side is where my problem is/was.
Look at the pic of the manifold....looks like salt deposits, hopefully from a leak in the gaskets of riser.
Never hydro locked and no water in oil.


Manifold



Riser

I actually tasted the deposits in the manifold.......definitely salt.
Should I just leave this?
Afraid to try to clean it out, don't want to get it into a cylinder.

 

[Bondo]

I actually tasted the deposits in the manifold.......definitely salt.
Should I just leave this?
Afraid to try to clean it out, don't want to get it into a cylinder.

Ayuh,.... No pictures I can see,....

Either way, whatever ya clean up, even if dropped down the manifold, will come Flyin' out, as soon as ya start the motor,....

 

[FreeBeeTony]

Pics not opening?

 

[Bondo]

Removed Port Riser today.
Think this side is where my problem is/was.
Look at the pic of the manifold....looks like salt deposits, hopefully from a leak in the gaskets of riser.
Never hydro locked and no water in oil.

Manifold

Riser

I actually tasted the deposits in the manifold.......definitely salt.
Should I just leave this?
Afraid to try to clean it out, don't want to get it into a cylinder.

Let's see,....

Nope,... I took the tags off the link, 'n left the [Im... over My head as well,.... Good luck,....

 

[FreeBeeTony]

Can you see them now?
I see them in your reply.

 

[Bondo]

Ayuh,....

You've got Alota cleanin' to do,....

By the looks of the salt trail, it's been leakin' Awhile,....

Have ya got compressed air Tony,..??

If ya Do,....
Do a thorough clean up, includin' the salt trails, pull the plugs on that side, 'n blow air into the cylinders,...
If a valve was open, you'll blow out any crud that got in,....
All the cylinders with closed valves, will blow the crud out, when ya light 'er off,...

 

[FreeBeeTony]

So you see them?
If so, any comments/suggestions?

 

[Bondo]

So you see them?
If so, any comments/suggestions?

Ayuh,.... Showin' great pictures now, but ya gotta clean 'em up to find the failure point,....

Comments edited into post #9,....

 

[FreeBeeTony]

Took pics of manifolds after clean-up.
I put the risers to the curb and when I got home they were gone!.....no pics.





Going to replace risers and use gaskets and block-off plates this time.