310 Sundancer Port Engine Overheating?

[Scott-F]

We're looking at buying a 2009 310 Sundancer (in Florida) with twin v-drives. It recently had the Port Engine Impeller replaced. On one of the preliminary test runs, after about 30 minutes, the Port Engine started to overheat. Throttling back dropped the temperature and then it ran fine for the next 20 minutes. I think the Broker had seen this happen a couple of times. The broker had the mechanic check it out and said "there was some growth on the through hull and in the main water line for the port engine, we've flushed and de-scaled that line and will run her again."

Is that a practical explanation for this issue or is there something else we should look at? I'm new to v-drives and not so familiar with them.

The official survey is later this week and I'll be sure to have them fully check that and the engines.

Thanks!

 

[Caveman22]

If the raw water pump impeller was replaced, I would hope they checked the trans cooler inlet for the old impeller fins and removed them. This could cause a blockage of cooling water also.

 

[garybly]

Could also be exhaust manifolds as it was in my case, unless you have closed cooling system

 

[Scott-F]

Thanks for those suggestions. They ran the boat again after descaling and still encountered the issue. Then they thought it was the circulation pump and replaced that. Now the broker is telling me he suspects there is an issue with the head gasket. That sounds pretty serious to me.

 

[wyrman]

It's time to move on from that one.

 

[Gulf Bob]

+1 on the impeller debris. They can backflush the system and I'll bet you will find pieces of old impellers.

 

[Espos4]

We're looking at buying a 2009 310 Sundancer (in Florida) with twin v-drives. It recently had the Port Engine Impeller replaced. On one of the preliminary test runs, after about 30 minutes, the Port Engine started to overheat. Throttling back dropped the temperature and then it ran fine for the next 20 minutes. I think the Broker had seen this happen a couple of times. The broker had the mechanic check it out and said "there was some growth on the through hull and in the main water line for the port engine, we've flushed and de-scaled that line and will run her again."

Is that a practical explanation for this issue or is there something else we should look at? I'm new to v-drives and not so familiar with them.

The official survey is later this week and I'll be sure to have them fully check that and the engines.

Thanks!

At some point the broker will tell you that everything is fixed.

Trust but verify.

Another sea trial is a must. A 20-30 minute cruise with a bit of WOT will be the true test to see if it’s been fixed.

Also watch the temperature coming off plane. Any spikes when going from a 3500 rpm cruising speed back down to idle speed are cause for concern.

 

[Scott215]

Just be careful. Test the boat how you will be using it