Mase 2.5 dies E82

[Ken Boyd]

Be surprised if the black foam insulation inside of the 2.5 Mase Generator cover has anything to do with engine cooling. How could it? Mine partially melted as a consequence of an overheating episode and the unit still cools fine. I suspect the black foam insulation is only there for sound deading purposes.

If you have good water flow through the system, suspect your problem lies either in the fan that circulates air through the heat exchanger or the sensor circuit detecting the overheating condition. This assumes your are operating the generator with the cover installed since it needs to be in place for the system to cool properly.

The fan should be fairly easy to check out by starting the generator with the cover removed and checking the air flow. If your air flow is good, your problem probably lies somewhere in the sensor circuit that is detecting the overheating condition and shutting the engine down.

 

[Namaste]

Well, it looks like 45 minutes of run time is the max I will get. After that it still shuts down with the overheat code. Water is pumping through the system fine. The only thing I have yet to do is replace the burnt insulation. I am now putting the boat up for the summer so "we will get them next year."
Thanks to all !

 

[knotflying]

I would think the Mase has a heat exchanger and perhaps some of the coils are blocked. Even though water is passing through you may not be getting a full flow.

 

[HRowland]

Some time ago I searched for an online copy of the Mase 2.7 service manual. I could not find one but did download a 2.5 service manual hoping it has a number of things that would apply to the 2.7 installed in my R27. Per the manual the 2.5 has two temperature sensing switches related to your issue, one on the engine and one on the exhaust at a point after the seawater is injected. If either of these trip then the E82 is displayed. The manual shows the location and provices the temperature sensing point so you can test them. They are normally open and close above a trip point.
The cooling on these gensets is a closed loop air flow by an engine driven fan. The air cools the engine and generator, heat is transfered out via a raw water heat exchanger, much like a heater core. As Mike said make sure the raw water flow is not partially blocked. You also said the insulation is damaged, this is used for noise purposes. You should check that no loose pieces have blocked any of the air passage channels or air side of the heat exchanger. It is possible that the insulation also helps keep the closed loop airflow working properly, verify that no air bypasses have occured which may reduce effective cooling airflow.

I am not able to access my home computer right now but a search should locate the service manual, I believe it was posted by a Mase source in another country. The Mase North America web site is very out of date.

Howard

 

[swillmerchant]

I just had the same problem with our generator this weekend, with only 13 hours of use. Tonight, I cleaned the strainer, but that didn't help, as no water was in the discharge. I shut it off quickly, opened the strainer a bit with the sea cock open to hopefully prime the pump a bit, closed the strainer and started it up again. That didn't work either and I noticed a slight burning smell. I guess I killed the impeller. I'll look into that and replace it as soon as I can order one.

How have others primed the water pump after cleaning out the sea strainers? I'm not very familiar with generators or engines, so I could use some advice.

When I inspected the strainer, I found it covered by blotches of an odd gray sponge-like material. When I scratched it, it kinda crumbled like dry clay. I have a BS in marine science and took invertebrate zoology in college, but I've never seen this stuff before. Has anyone seen similar stuff in their strainers? I got it off with a wire brush, but I'm baffled to know what it is.

 

[Capt Rob]

A very timely threaded discussion. my boat sat up for a year and now has algae in the main tank which has blocked the main and generator fuel lines, so I am working through problems with my MASE 2.5K generator installed on my 2010 Ranger 25. How do i get rid of the algae in the tank?

As a side note, my generator was installed after it left the factory. The local installer just T connected the generator fuel line from the main fuel tank. There is no generator in line fuel filter nor a water separator that is recommended by the MASE technician. I am currently in the process of locating where to put those items. Any Suggestions?

Also, I need suggestions on how to remove the generator fuel pump. I have gotten the top white shells off and removed the bulkhead access panel inside the cabin by the battery switches but still find it hard to get at the pump. I am thinking of just by passing the old pump and installing a new one. I just dont know where too put it or if that is a good idea.

Any Thoughts?