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Cummings engine
- Thread starter rhicks
- Start date
Ken Boyd
Well-known member
- Joined
- Jun 2, 2011
- Messages
- 69
- Fluid Motion Model
- C-248 C
- Hull Identification Number
- 2517H809
- Vessel Name
- Kristi Marie
I cannot comment on the Yanmar but a few thoughts on the Cummins QSD 2.0 installed in my R-25.
- Changing the engine oil is straight forward assuming you have a pump to suck it out through the dip stick hole or the oil drain hose at the bottome of the engine.
- The oil filter is out in the open and easy to change though a little messy since the element is the type that mounts inside a cansiter rather than the spin on variety.
- Both fuel filters are out in the open and relatively easy to change.
- Changing the raw water pump impeller is difficult. It would help if you have very long arms and are very thin.
- Changing the oil in the transmission is similar to changing the oil in the engine in that you need to pump it out. Getting the transmission's oil filter out for cleaning is difficult. The instructions in the manual are essentially useless.
- Changing the engine's antifreeze is straight forward if you ignore the instructions in the manual and instead drain it at the two hoses where it routes through the water and the cabin heaters. After you change it, air bubbles form in the system so you will need to keep topping it up at the overflow tank the first few times you run it.
- The engine ground strap installed by Ranger at the factory does not appear to be adequate once it has been in service for a while. I installed a secondary 2 gage ground cable from the engine to the engine battery and the engine starts a lot easier.
- Initially there were some problems with the engine control software but updates seemed to have fixed that problem.
- Finding a mechanic certified to work on the Cummings QSD series of engines is a bit of a challenge.
- Now that Cummins and MercCruiser have parted ways buying parts for the Cummins might get interesting though my local Cummings truck engine dealer has been very helpful in the past.
- The Cummins engine is very economical if you stay at hull speeds. If you push the boat up to 75% or higher engine power, the fuel consumption goes up considerably though you are not really going that much faster. The Cummins is interesting in that MPG peaks at idle. The more RPMs you turn the worse your MPG gets though your speed increases. There is no sweet spot in the Cummins' fuel consumption curve where MPG peaks.
Hope this helps.
- Changing the engine oil is straight forward assuming you have a pump to suck it out through the dip stick hole or the oil drain hose at the bottome of the engine.
- The oil filter is out in the open and easy to change though a little messy since the element is the type that mounts inside a cansiter rather than the spin on variety.
- Both fuel filters are out in the open and relatively easy to change.
- Changing the raw water pump impeller is difficult. It would help if you have very long arms and are very thin.
- Changing the oil in the transmission is similar to changing the oil in the engine in that you need to pump it out. Getting the transmission's oil filter out for cleaning is difficult. The instructions in the manual are essentially useless.
- Changing the engine's antifreeze is straight forward if you ignore the instructions in the manual and instead drain it at the two hoses where it routes through the water and the cabin heaters. After you change it, air bubbles form in the system so you will need to keep topping it up at the overflow tank the first few times you run it.
- The engine ground strap installed by Ranger at the factory does not appear to be adequate once it has been in service for a while. I installed a secondary 2 gage ground cable from the engine to the engine battery and the engine starts a lot easier.
- Initially there were some problems with the engine control software but updates seemed to have fixed that problem.
- Finding a mechanic certified to work on the Cummings QSD series of engines is a bit of a challenge.
- Now that Cummins and MercCruiser have parted ways buying parts for the Cummins might get interesting though my local Cummings truck engine dealer has been very helpful in the past.
- The Cummins engine is very economical if you stay at hull speeds. If you push the boat up to 75% or higher engine power, the fuel consumption goes up considerably though you are not really going that much faster. The Cummins is interesting in that MPG peaks at idle. The more RPMs you turn the worse your MPG gets though your speed increases. There is no sweet spot in the Cummins' fuel consumption curve where MPG peaks.
Hope this helps.
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