R25 Maximum RPM and battery charging

[Wolfboy]

This past weekend we were out on Slipaway and I noticed a couple of things. First, while I've read that the 110hp Yanmar has a maximum RPM of 3400, I can't get it to go beyond 3000 at WOT. I don't know if that's normal, if I need to make a throttle adjustment, or if it's more involved than that. Any ideas?

Second, the engine battery does not seem to be charging while the engine is running. The house battery charges just fine. It will charge off the generator but unfortunately I'm not in a slip that I can try charging off shore power. I have a suspicion that it would charge off of shore power, if that were an option. I can work around it by switching the engine and house parallel switch to On but I'm not sure that's a good idea and regardless, I'd rather have it getting it's own charge at all times. I suspect the charging relay but I don't know for certain. Has anyone else experienced this?

 

[TexasEye]

Turbocharger would be on my list. All the basics, intake filter, timing, fuel injectors etc, but turbo is guilty quite often

 

[NorthernFocus]

This past weekend we were out on Slipaway and I noticed a couple of things. First, while I've read that the 110hp Yanmar has a maximum RPM of 3400, I can't get it to go beyond 3000 at WOT. I don't know if that's normal, if I need to make a throttle adjustment, or if it's more involved than that. Any ideas?

The most common cause of not reaching WOT is the wrong propeller, typically too much pitch.

Second, the engine battery does not seem to be charging while the engine is running. The house battery charges just fine. It will charge off the generator but unfortunately I'm not in a slip that I can try charging off shore power. I have a suspicion that it would charge off of shore power, if that were an option. I can work around it by switching the engine and house parallel switch to On but I'm not sure that's a good idea and regardless, I'd rather have it getting it's own charge at all times. I suspect the charging relay but I don't know for certain. Has anyone else experienced this?

Is your boat fitted with automatic charging relays(ACRs) between banks? If so that would be the first place to look. There are LED indicators on the relay to indicate when it is open/closed. You can download the spec sheet with functional description from the Blue Sea Systems web site.

https://www.bluesea.com/products/7610/SI-ACR_Automatic_Charging_Relay_-_12_24V_DC_120A

In short, the relay should close 30 seconds after the engine starts connecting the additional banks to the alternator.

The ACRs are not in the circuit when on shore/generator charge because the charger connects directly with all three battery banks(assuming you have the "standard" charger supplied with the boat.

Hope this helps.

 

[doke01]

It's happened to me. Dirty fuel filter.

I think your boat is too old, since you say it has a Yanmar 110HP, and doesn't have that fancy ACR noted above, same as mine. I would pull on the battery cables and follow them doing the same. It's likely one is loose at the connector and has corroded, but you won't see it until you wiggle the cables. I had this happen at the battery itself. You could literally pull the cable out of the connector.

 

[stevevoyce@yahoo.com]

So my starting battery does not charge from alternator either. It is a 2008 Ranger 25 classic with the 110 Yanmar. It does not have ACRs and I have no idea how the alternator charge voltage is supposed to get to the starting battery. Any info you find would really help me. I will let you know what I discover also. On another note it looks like my 12 volt cooling water pump comes on with the ignition switch so I am assuming it is being powered by the starting battery.

 

[gdumore]

The ACR's have an issue combining the batteries, if the voltage drops to low on the battery bank serviced by the ACR. This happened with our house batteries on our last trip. I ran the engine, but the house batteries would not charge. I looked at my solar panel controller to confirm what voltages I had in my house and starter battery. The fix for this is to switch the emergency parallel battery switch "on" for a few minutes with the engine running and combining the voltage of the house and starter batteries and activating the ACR. Just do not forget to switch the emergency parallel switch back to the "off" position. If you are plugged into shore power and the battery charger is on, the battery voltage will increase the voltage of the depleted battery resulting in the ACR working properly with the next engine operation. I hope this helps.

Cheers
Glenn
Also an afterthought you can add an indicator light to show when the ACR's have combined the batteries. We have these on our fire vehicles and you see that it sometimes takes a few minutes to activate and combine the batteries.