Cobalt Boats Forum

Hi
I have a Cobalt 255 and I’d like to replace the docking lights with stronger ones. Does anyone know what type of bulb the original units use, and if there’s a plug-and-play LED upgrade that fits the existing housings? Any tips or experiences are greatly appreciated.
grtz

Hi everyone,

I have a question about the oil pressure on my Volvo Penta 5.7 GXi. I’ve noticed that the needle sometimes fluctuates quite a bit.

On a cold start, it’s stable at around 40 psi at idle. After about an hour of cruising, idle oil pressure drops to about 10–20 psi and fluctuates ...

Hi all,

I recently discovered a very small crack in one of the exhaust manifolds on my boat with a Volvo Penta 5.7GXi engine. I’m planning to replace both the manifolds and elbows, but I’d also like to pressure test the block to be safe.

Since this is an open cooling system, what is the correct ...

Hi everyone,

I'm working on a custom design for SeaDek type decking and I'm looking for vector versions of the Cobalt logos. Ideally, I’d love to get them in .dwg format for use in AutoCAD, but other vector formats could also work.

If anyone has these files and is willing to share, I’d really ...

Thanks for the feedback! The dark blue colors are really just meant as accents, so hopefully the heat won’t be too much of an issue. I’ve ordered some samples of both upholstery and seadeck materials to get a better idea of how everything will look.

I also may want to keep things as original as ...

Hi everyone,

I’m excited to officially introduce myself here. I’ve already posted a few questions but wanted to take a moment to properly say hello.

I’m the owner of a Cobalt 255 with a Volvo Penta 5.7GXi engine. Our home port is in Belgium, and we’ll mainly be cruising around Europe. We’re a ...

Hi all,

A general question that many boat owners may have faced:
What’s the most effective way to use fenders and mooring techniques for long-term berthing in a marina—especially one located along a canal or in areas with occasional small waves?

Most boats seem to use the classic approach: fenders ...

Hi everyone,

I recently purchased a Cobalt 255 and I'm very happy with the boat overall. However, the upholstery on the seats and other areas is in pretty bad shape. I'm currently considering having everything reupholstered.

I plan to keep the white sections as they are, but I'm debating whether ...

Just a quick update – I’ve reached out to Orca Marine via email to ask about the availability of a closed cooling conversion kit for the 5.7 GXi and to get their advice on the feasibility for an older engine.

Thanks again to everyone for the helpful input! I’ll share any useful info I receive from ...

Thanks for the helpful info, this also aligns with my own preference. I’m seriously considering converting to a half-closed cooling system.

I’m currently looking for a good quality conversion kit. Does anyone have experience with a reliable kit (ideally one specific to this engine), or can ...

Hi everyone,

I recently purchased a Cobalt 255 with a 2005 Volvo Penta 5.7 GXi engine and would like to use it in saltwater. I was wondering if I should modify the cooling system. At the moment, it’s an open cooling system. I’ve searched this forum and the internet for info and kits to convert it ...

Thanks everyone for the information! I'm glad to have found you all, this forum is a wonderful source of information.

RWM250 wrote: Tue Apr 29, 2025 11:52 pm This may help. You can see what years each Cobalt model was built.

https://www.boatsdata.com/cobalt/models

Thx!

03K possibly means 2003, with 'K' being the 11th letter of the alphabet, so November? I'm curious about this too, really interesting info!

Here are some photos.