Engine removal

Slowboat said:
I have a 2000 340 sundancer. The exhaust manifolds need to be replaced. The bolts are rusted and cannot be removed by wrench. I plan to drill off the head of the bolt and remove the manifold off the stud. Problem being it seems impossible to drill the two inside manifolds. Therefore I want to remove the engines. My question is can the engine and trans come out at the same time.
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How bad are the heads of the bolts rusted, have you tried bolt extractors?

 
The bolts are rusted so bad that a 9/16 wrench will not even attempt to turn the bolt before slipping. I also tried a professional grade extractor.
A professional marine mechanic may get it done. It would be interesting to see how they would approach this tast.
 
1988 340 dancer, been there and done that. Picked up a set of "metrinch" sockets. Picked the socket
that was just a little too small. Using a ratchet extension, the socket and a 2 lb mallet I just beat the socket
on. Got all the rusted bolts out of all 4 manifolds. by the time I was done the extension and socket had to go
in the trash. way better than pulling the engines or trying to grind off the bolts
 
Happy hour IV. You were able to get the socket beat on the two middle manifolds . There is not much room. How did you approach this.
 
Solution…
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In fairness, not one thing works for every bolt. It just takes time and patience. Drilling bolts works if you have enough bits and a right angle drill head. Beating a metric six point socket on also works sometimes.

You have the same problems to solve whether it is in or out of the boat.

Start with the easiest things to use and keep progressing toward drilling or grinding the head of the bolt off. Eventually all of them will come out.
 
Slowboat said:
Happy hour IV. You were able to get the socket beat on the two middle manifolds . There is not much room. How did you approach this.
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Keep in mind that the manifold bolt is angled down towards the bolt head due to the sloping side of the head. This allows a short swing angle for the mallet under the other engine manifold. Do an outside manifold bolt first. Once you get the idea that works you can then tackle the between the engine manifolds. I didn't need it, but thinking now, a small impact with a wobble extension might work between the engines
 
Just a thought. I am in saltwater and have gotten my fill doing valve jobs due to the two problems with saltwater taking out valves and once an engine. So I converted to 496 dry joint manifolds and slightly changed the geometry of the elbow down angle. And as long as I was at it I moved my oil coolers to the top of the engine so
I do not need to pull an engine to replace them in the future
 
Answer to your original question is yes, engine/transmission can come out at the same time. I pulled both of my engines/trans out of my boat November 2022.
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