Cracked exhaust manifolds

[ddubose]

The Texas freeze cracked both exhaust manifolds on my 2004 Caravell. Volvo Penta 4.3l GL-D, the oil looks good no water. Winterized it by draining the block but didn’t do the manifolds. Live and learn. My question is can I start it with the manifolds cracked without doing further damage? I’d like to know for sure if that’s the only damage.

 

[Lou C]

No do not do that, it can put water right in a cylinder. Get new manifolds & elbows and save the engine. Why did you not drain the manifolds?

 

[Bondo]

My question is can I start it with the manifolds cracked without doing further damage? I’d like to know for sure if that’s the only damage.

Ayuh,..... Along with Lou's fear of internal cracks, another good reason not to run it is,.....
The exhaust water will run outa the cracks, rather than mixin' with the exhaust to cool it, 'n not burn up all the rubber parts downstream in the exhaust system,.....

 

[Scott Danforth]

The Texas freeze cracked both exhaust manifolds on my 2004 Caravell. Volvo Penta 4.3l GL-D, the oil looks good no water. Winterized it by draining the block but didn’t do the manifolds. Live and learn. My question is can I start it with the manifolds cracked without doing further damage? I’d like to know for sure if that’s the only damage.

did you drain the intake manifold thermostat well? if not, plan on an intake manifold.

 

[ddubose]

Thanks for the replies. I’ve never drained the exhaust manifolds in 20 years. I’ve always just drained the block. I live in South Texas, San Antonio area. Looks like my luck ran out. The other reason is the drains are at the back of the manifolds and my current boat has a walk through transom, no room to do much maneuvering.

 

[Scott Danforth]

You are getting off easy. Many people in texas buying new motors. Estimated about 30,000 to 50,000 I/Os in Texas that are not properly winterized

 

[Lou C]

You know you can simply disconnect the feed hoses at the front of the manifolds to drain them? Also there is a drain plug that is on the forward edge of the intake manifold on the Vortec models that needs to be removed so the water passage under the thermostat housing can fully drain. This was not needed on the older pre Vortec models.