Hi P-Dog
Obviously a lot of variables depending on what you buy, how you use it and its history of maintenance, I can give you an indication of what we have spent over 4 yrs of ownership with twin Cummins 210hp
I mostly have done my own maintenance.
I had strong mechanical background but very little diesel experience prior to purchasing this boat.
Routine maintenance items are fairly predictable and need to be completed every 1 or 2 yrs
- Engine oil and filters
- Fuel Filters
- Belts
- Anodes
- Hoses as required
- Heat exchanger maintenance
- Raw water pump impellors
- valve lash
This is would cost about $750 per engine per year in parts.
Then there is the less regular repairs that crop up that you have to have budget for when it happens.
- I decided to do the head gaskets on both our engines due to coolant seeping down the block externally (many people just leave them) I did water pumps, thermostats etc while I was at it, this cost $3000 all up but it was a big DIY job that could have been double if someone else was doing it.
- Just had a fuel issue and had to have the diesel tank cleaned, 1 injector pump replaced and all the injectors rebuilt (injectors overdue anyway) as well as a lift pump and a bunch of smaller stuff, I have been busy with work so had this done professionally and cost $9000 all up.
-Rebuilt the raw water pumps myself (bearings and seals) costing $750 all up in parts (double that for new pumps)
- I would like to replace all of the engine mounts but this will be another $3-4000, its a large DIY job for the future
- (edited after post) 2x exhaust elbows and 1x new turbo $6000
You can see that there is another (edited after post) $2000 per/engine per/year there so the total is about $2500-3000 per/engine year, the Cummins 6BT 210hp has a reputation for being one of the better engines for maintenance costs, we have done a total of 500hrs running in 4 years and the engines are certainly in better condition now than when we bought the boat.
Also bear in mind that you have gear boxes or legs, propellers, anodes, trim tabs, washdown pumps, toilets, pumps and holding tanks etc, so the maintenance does add up so it makes a huge difference if you are able and willing to do the maintenance yourself.
I did not do a diesel course but I have learned a lot just doing it and finding the information as I needed it, if you engage and build a relationship with a marine engineer from the outset (starts with engineering surveys at purchase) this can be a great resource for you depending on your background knowledge.