The Marquis has a dubious manifold...
 

OK, so while I have the boat out in the sunlight and have the back
panel off to look for anything that myight need repairs, I noticed
that the previous owner muust have left water in the left exhaust
manifold and it froze and cracked. They have generous globs of JB Weld
over them and it held well, However I noticed that there is a bottom
crack where it seems the JB weld has cracked loose and I can see a bit
of rust.

Due to aftermarke, the price of a lot of these items has really come
down to being reasonable. I probably ought to change out the manifold
but it's a real bugger to take of where it sits. So, I'm going to chip
away at the repair to see how sound it is.

this isn't a presurized system so there's not any steam build up. And
the repair looks like it's held for quite a while, but is starting to
fail.


Does anyone know of a better smear on product to seal the crack? Or
should I jsut bite it and buy a new manifold?

The Marquis has a dubious manifold...
 

On Jul 15, 9:00*am, Tim wrote:
OK, so while I have the boat out in the sunlight and have the back
panel off to look for anything that myight need repairs, I noticed
that the previous owner muust have left water in the left exhaust
manifold and it froze and cracked. They have generous globs of JB Weld
over them and it held well, However I noticed that there is a bottom
crack where it seems the JB weld has cracked loose and I can see a bit
of rust.

Due to aftermarke, the price of a lot of these items has really come
down to being reasonable. I probably ought to change out the manifold
but it's a real bugger to take of where it sits. So, I'm going to chip
away at the repair to see how sound it is.

this isn't a presurized system so there's not any steam build up. And
the repair looks like it's held for quite a while, but is starting to
fail.

Does anyone know of a better smear on product to seal the crack? *Or
should I jsut bite it and buy a new manifold?

BTW, This manifold in question is on a v-8 350 Chevy mercruiser

The Marquis has a dubious manifold...
 

"Tim" wrote in message
...
OK, so while I have the boat out in the sunlight and have the back
panel off to look for anything that myight need repairs, I noticed
that the previous owner muust have left water in the left exhaust
manifold and it froze and cracked. They have generous globs of JB Weld
over them and it held well, However I noticed that there is a bottom
crack where it seems the JB weld has cracked loose and I can see a bit
of rust.

Due to aftermarke, the price of a lot of these items has really come
down to being reasonable. I probably ought to change out the manifold
but it's a real bugger to take of where it sits. So, I'm going to chip
away at the repair to see how sound it is.

this isn't a presurized system so there's not any steam build up. And
the repair looks like it's held for quite a while, but is starting to
fail.


Does anyone know of a better smear on product to seal the crack? Or
should I jsut bite it and buy a new manifold?

BITE!

The Marquis has a dubious manifold...
 

On Jul 15, 9:11*am, "Harold" wrote:
"Tim" wrote in message

...



OK, so while I have the boat out in the sunlight and have the back
panel off to look for anything that myight need repairs, I noticed
that the previous owner muust have left water in the left exhaust
manifold and it froze and cracked. They have generous globs of JB Weld
over them and it held well, However I noticed that there is a bottom
crack where it seems the JB weld has cracked loose and I can see a bit
of rust.

Due to aftermarke, the price of a lot of these items has really come
down to being reasonable. I probably ought to change out the manifold
but it's a real bugger to take of where it sits. So, I'm going to chip
away at the repair to see how sound it is.

this isn't a presurized system so there's not any steam build up. And
the repair looks like it's held for quite a while, but is starting to
fail.

Does anyone know of a better smear on product to seal the crack? *Or
should I jsut bite it and buy a new manifold?

BITE!- Hide quoted text -

- Show quoted text -

Yeah, that's what I'm thinking. Running around a lake where you don't
have far to go to shore is one thing, being out on the Ohio River is
totally another.

Bit still. It wouldn't hurt to have a tube of 'something' on board to
try to make a quick fix if necessary.

The Marquis has a dubious manifold...
 

"Tim" wrote in message
...
On Jul 15, 9:11 am, "Harold" wrote:
"Tim" wrote in message

...



OK, so while I have the boat out in the sunlight and have the back
panel off to look for anything that myight need repairs, I noticed
that the previous owner muust have left water in the left exhaust
manifold and it froze and cracked. They have generous globs of JB Weld
over them and it held well, However I noticed that there is a bottom
crack where it seems the JB weld has cracked loose and I can see a bit
of rust.

Due to aftermarke, the price of a lot of these items has really come
down to being reasonable. I probably ought to change out the manifold
but it's a real bugger to take of where it sits. So, I'm going to chip
away at the repair to see how sound it is.

this isn't a presurized system so there's not any steam build up. And
the repair looks like it's held for quite a while, but is starting to
fail.

Does anyone know of a better smear on product to seal the crack? Or
should I jsut bite it and buy a new manifold?

BITE!- Hide quoted text -

- Show quoted text -

Yeah, that's what I'm thinking. Running around a lake where you don't
have far to go to shore is one thing, being out on the Ohio River is
totally another.

Bit still. It wouldn't hurt to have a tube of 'something' on board to
try to make a quick fix if necessary.

It wouldn't hurt to carry some JB Weld and Marine Tex in your on board tool
kit.

The Marquis has a dubious manifold...
 

On Jul 15, 10:26*am, "Harold" wrote:
"Tim" wrote in message

...
On Jul 15, 9:11 am, "Harold" wrote:





"Tim" wrote in message

...

OK, so while I have the boat out in the sunlight and have the back
panel off to look for anything that myight need repairs, I noticed
that the previous owner muust have left water in the left exhaust
manifold and it froze and cracked. They have generous globs of JB Weld
over them and it held well, However I noticed that there is a bottom
crack where it seems the JB weld has cracked loose and I can see a bit
of rust.

Due to aftermarke, the price of a lot of these items has really come
down to being reasonable. I probably ought to change out the manifold
but it's a real bugger to take of where it sits. So, I'm going to chip
away at the repair to see how sound it is.

this isn't a presurized system so there's not any steam build up. And
the repair looks like it's held for quite a while, but is starting to
fail.

Does anyone know of a better smear on product to seal the crack? Or
should I jsut bite it and buy a new manifold?

BITE!- Hide quoted text -

- Show quoted text -

Yeah, that's what I'm thinking. Running around a lake where you don't
have far to go to shore is one thing, being out on the Ohio River is
totally another.

Bit still. It wouldn't hurt to have a tube of 'something' on board to
try to make a quick fix if necessary.

It wouldn't hurt to carry some JB Weld and Marine Tex in your on board tool
kit.- Hide quoted text -

- Show quoted text -

Those are on the check list...

The Marquis has a dubious manifold...
 

On Thu, 15 Jul 2010 07:00:17 -0700 (PDT), Tim
wrote:

Or
should I jsut bite it and buy a new manifold?

Yes, and check/replace the risers also. If either one fails you can
hydro lock the engine with disasterous results. In salt water they
have a typical life expectancy of 4 or 5 years.

The Marquis has a dubious manifold...
 

On Jul 15, 11:28*am, Wayne.B wrote:
On Thu, 15 Jul 2010 07:00:17 -0700 (PDT), Tim
wrote:

Or
should I jsut bite it and buy a new manifold?

Yes, and check/replace the risers also. *If either one fails you can
hydro lock the engine with disasterous results. *In salt water they
have a typical life expectancy of 4 or 5 years.

Yes, and these are origionals from 1977. When I do the manifold work,
I'll at least take them to the boat shop and at least have them tested
and evaluated.

The Marquis has a dubious manifold...
 

On Jul 15, 12:47*pm, W1TEF wrote:
On Thu, 15 Jul 2010 07:00:17 -0700 (PDT), Tim
wrote:

buy a new manifold?

Buy the manifold you cheapskate. *:)

Eh, not that cheap Tom. But was weighing out the hassle of the change
out. But it is best to be safe. Like I mentioned, for local running it
wouldn't be a big bother, but doing a 150-200 mile river run (one way)
That's different.

Buy it shall be.

The Marquis has a dubious manifold...
 

On Jul 15, 2:55*pm, Tim wrote:
On Jul 15, 12:47*pm, W1TEF wrote:

On Thu, 15 Jul 2010 07:00:17 -0700 (PDT), Tim
wrote:

buy a new manifold?

Buy the manifold you cheapskate. *:)

Eh, not that cheap Tom. But was weighing out the hassle of the change
out. But it is best to be safe. Like I mentioned, for local running it
wouldn't be a big bother, but doing a 150-200 mile river run (one way)
That's different.

Buy it shall be.

I agree, they are way past their life expectancy. There are a number
of economical after market replacements. Do both the manifolds and
risers. Are they log style or center riser?