Cobalt Boats Forum

In case anyone would like to know how this turned out:

The dealer replaced the Helm Control Unit, but when I tested it, the symptoms returned after 10 mins of idling (water temp at 167 deg). Today they replaced the impeller (not sure why, based on symptoms this wasn't done earlier) and it tested OK ...

Quick update: the dealer's tech took a look today and determined that "...the brain that's in your whole assembly is bad." (quote from their email). So, apparently not a cooling or exhaust temp issue (assuming they're right).

Shakes our confidence in the boat (our second new Cobalt) to have it ...

Thanks - I will mention the flush port to the dealer. The boat is in the water, so I can't get to the port you mention.

That is interesting that yours reads the same 1330 degrees - the value must mean something else or as you say, a dummy value from EVC. I checked the two sensors today and there were both plugged in securely (I had hoped for something simple). I removed both and checked with ohmmeter and they both ...

I found the Volvo service manuals site: https://www.volvopenta.com/your-engine/manuals-and-handbooks/ as well as the parts site: https://www.volvopenta.com/shop/0 - so my next step will be to examine the two exhaust temp sensors, make sure they didn't get disconnected/broke somehow and perhaps pull ...

Hi all - a quick update: Given the feedback that the exhaust temp reading of 1330 degrees F was super high - I used the Volo Easy Connect app to check the exhaust temp reading prior to and just after starting the engine. Turns out - it reads 1330 degrees before even starting (and also just after ...

Thank you - I will check these. I assume (but will check) that the impeller was changed at the 100hr service. And the water temp stayed at its normal 167 degrees the whole time - but I supposed the same system is supposed to be delivering cooling water to the exhaust manifolds and that might not be ...

Thanks for the information jhnmdahl and stifflkd - I appreciate it. I was able to use the Volvo Easy Connect app yesterday to get some info while I reproduced the problem.

I ran the engine in idle for 5-10 mins until the same error occurred:
Exhaust temperature too high
Engine power is reduced ...

Hi all,

We took our R5 w/Volvo 350 (Surf, but otherwise same as regular R5) out for first time this season after 100 hour service + winterization last fall, and now de-winterized and ran into an issue:

The engine started, warmed and ran normally as we idled out in the marina. I put the engine ...

Update: Dealer got the part in after three weeks, pulled the engine and installed it this week. I took it out for a test drive yesterday and while the coupler works fine, I noticed the steering was very heavy, especially turning to the right. The power steering fluid was very low and the cylinder to ...

An update - after 3 weeks, the engine coupler part should arrive soon.

The dealer said: "Your engine will need to be removed to make the repairs. it’s a very big complex job. We normally only preform this sort of work in the off season,..."

Of course I am concerned about finding the root cause of ...

Bruce gets the remote boat diagnostic award :). Here's what the service tech said:

"We were out at your boat today, and found that the coupler on the rear of the engine has failed. It’s not engaging the driveshaft for the outdrive.
Our technician double checked and it’s unfortunately not an ...

Thanks Bruce, I bet you're right. Seems like an odd thing to fail under low load, maybe was not attached well and worked itself loose. I'll post what dealer finds.

Thanks jhnmdahl. I took a look again today and here's more info (will talk to dealer tomorrow - of course this happens on the first summer weekend here in Seattle...)

Props look fine. The noise is coming from the back of the engine - I am no expert, but it seemed odd to me that I can see this ...

Hello,

Today we were cruising at 6 knots in our 2021 R5 Surf w/ 350 Volvo. We heard the engine start making a new high pitched buzz and propulsion stopped as if we'd shifted into neutral. Throttle advanced rpms but no propulsion in fwd or Rev. The buzz seems to come from rear of engine. I shut down ...