4.3 L exhaust 90 degree drain cracked in manifold

[Stan78734]

looking for help. I am looking to purchase a boat (inexpensive). Problem I have to test motor is that the 90 degree drain valves in the exhaust manifold froze and broke right at the surface of the manifold. In other words the threads of the 90 degree drain are still in the manifold.

Without tearing the whole manifold out to access these threads, looking to this group for recommendations.

I have ordered some 3/4 inch pipe easy outs to see if that would work. But are there any other tricks to consider vs using a hacksaw blade for 30 minutes in a 2x2 space?

 

[Bondo]

Ayuh,..... Welcome Aboard,..... Why would you want to buy a boat with a frozen busted motor,..??
It probably has a frozen busted block too,....

 

[Stan78734]

That is what I am trying to find out. Is the block cracked as well.

 

[achris]

Just pressure test the block (and heads).

 

[Stan78734]

Hmmmm. It is a $2000 boat. Trying to do the shady tree diy thing. Replace what I know is broken for $15. Then power it up to see if there are any other leaks or water in the oil.

 

[Eric 3.7LX Alpha 1]

You might be able to use a rubber expansion type plug to pressure test the engine. They make different sizes... I wouldn't know what size you'd need. Something like these: Rubber expansion wing nut plug

 

[alldodge]

On muffs there will be very little if any pressure. Go to hardware store and pick up a hand full of rubber or wood plugs and a roll of electrical tape. Push the plugs into the manifold elbows and if need be wrap so tape around them.

Put muffs on a fire it up. Once its running the guy your buying it from may decide its worth more

 

[Stan78734]

You might be able to use a rubber expansion type plug to pressure test the engine. They make different sizes... I wouldn't know what size you'd need. Something like these: Rubber expansion wing nut plug

This makes a lot of sense. I can plug the water jacket of the manifold to test to see if there are other leaks. Awesome recommendation. Thanks!

 

[Stan78734]

On muffs there will be very little if any pressure. Go to hardware store and pick up a hand full of rubber or wood plugs and a roll of electrical tape. Push the plugs into the manifold elbows and if need be wrap so tape around them.

Put muffs on a fire it up. Once its running the guy your buying it from may decide its worth more

I like this as well. I just need to block off this ports to test. Thanks!

 

[Rick Stephens]

I would posit that the only thing more expensive than a cheap fixerupper boat is a cheap fixerupper airplane.

 

[Stan78734]

“IF” (notice that is BIG) it is only the 90’s drain there is no work to do. Everything else is in good shape. I will flip it for couple thousand profit. If problems, it stays with the buyer. No risk here.