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Bhen's thundercat crankshaft replacement


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1 minute ago, Carlos Danger said:

THe real question is why should it be necessary to replace a crankshaft that is supposed be in place for the life of the vessel?    

Arctic Cat made it ?????

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3 minutes ago, Momorider said:

Bet that thing dosent turn at 8K :dunno: 

Most of the Locomotive size diesels turn 1000 rpm or less and take a couple of minutes to go from idle to full throttle.  Cruise ships nowadays just have generators with none of the engines attached to a prop shaft mechanically.   

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1 hour ago, Carlos Danger said:

Most of the Locomotive size diesels turn 1000 rpm or less and take a couple of minutes to go from idle to full throttle.  Cruise ships nowadays just have generators with none of the engines attached to a prop shaft mechanically.   

Diesel locomotives are the same. I read that the boat has a 12,000 hour tear down spec on the 5 motors. 3 days crank replacement and 5 days prep work. The crank is 8 tons. 

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25 minutes ago, spin_dry said:

Diesel locomotives are the same. I read that the boat has a 12,000 hour tear down spec on the 5 motors. 3 days crank replacement and 5 days prep work. The crank is 8 tons. 

I have seen big diesel Gen sets that have been in place for 50+ years with original cranks.  Pistons, Heads and wet sleeves get changed out  or repaired but the crank not so much.

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2 hours ago, Carlos Danger said:

Most of the Locomotive size diesels turn 1000 rpm or less and take a couple of minutes to go from idle to full throttle.  Cruise ships nowadays just have generators with none of the engines attached to a prop shaft mechanically.   

We had a guy who worked for us for a while that retired from a grain elevator.  He told us how they'd have to jump start the locomotive from time to time - hook up a welder. 

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2 minutes ago, racinfarmer said:

We had a guy who worked for us for a while that retired from a grain elevator.  He told us how they'd have to jump start the locomotive from time to time - hook up a welder. 

There was one in place in Marshalltown IA that had been in operation since the 1930s.  A monster of a thing two stories tall 30 or 40 feet long probably weighed 100 tons or more.  Last time out there a few years back I think it still ran as a back up from time to time.

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10 hours ago, Carlos Danger said:

I have seen big diesel Gen sets that have been in place for 50+ years with original cranks.  Pistons, Heads and wet sleeves get changed out  or repaired but the crank not so much.

No doubt it was some type of oil starvation issue. I would think that with the cost of that equipment there would be some failsafe measures baked into the driveline to prevent this. My car shuts down if there’s a coolant or oiling issue. 

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