1998 454xLi TBI Exhaust replacement

[kimosammy]

Getting ready to replace the Manifold and riser on my 1998 454xLi.
Question is, do I need to burp the cooling system?
The raw water goes through the system starting with the water pump, then winds though the trans Oil cooler,
Heat Exchanger, Exhaust riser then out the door.
The rest of the motor is anti-freeze, including the manifolds.
There is a metal plate between the manifold and riser separating the anti-freeze in the manifold and raw water
in the exhaust riser.
If I install the manifold and riser with the metal plate, will there not be a air pocket stuck between
the manifold and riser?

 

[kimosammy]

Been doing more research, not finding anything about an air-pocket problem.

 

[erich]

I don't see why there could be an air pocket, at least not as I understand the flow of water/antifreeze/coolant through the manifold. Doesn't your setup have a hose going to the bottom of the manifold and another on the top? That is what this diagram shows... http://www.marinepartssource.com/crusaderpb/454xlikp57.asp

Erich

 

[fastjeff]

You might have to "burb" it at first start up, but it should be okay after that. Leave the cap off the tank until the motor is up to temperature, then refill to the top.

Jeff

 

[kimosammy]

That is the correct layout....I guess the circulation will take care of it.

 

[kimosammy]

Update - Replaced the manifold and risers about 60 hours ago. Did nothing special...all worked out good.
She dropped about 10 degrees in temp.