Originally Posted by Dennis.G
I have a 4 kW Entec generator on my sailboat. It's a Johnson dual unit pump (raw and coolant pumps on single
shaft, engine driven). Have a bad bushing and very worn plates etc. Looking to replace or rebuild
. Anyone have source advice for this pump unit? I have emailed SPX flow and Mastry Engine for help, but looking for any first hand advice on this.
IMHO and FWIW
You can contact Doug Jensen <djense(at)mastry.com> He is very helpful and a quick call +13868721473 is faster to get the answer you are looking for.
The Johnson pump is the weakest link. You have 3 options.
1. Rebuild the pump and continue with the future risk of this pump failing which will allow the salt water
into the FW side. This will corrode your thermostat - this is what happened to mine.
2. Remove the raw water and use a AC 110v March magnetic pump which is what I did. Caution - If you choose this route
, this pump MUST be installed much lower than water line at all angle of heeling.
BC-3CP-MD 115 VOLT PUMP Each 342.00
3. Use a Johnson 12v pump for the fresh water side - a better option. I found out after buying
the March pump .
10-24503-03 PUMP CM30P7-1 12V 1.00 Each 269.00
Entec came with the boat in 2013 - has some 1,100 hours. I added another 200 hours. Rebuild the whole unit. Replaced the fuel
solenoid, valve springs, valves and the thermostat and bought the 110v March pump. I think the 12v path is better, well at least according to mastry's new machine design.
For the initial trouble shooting when I could not get the entec to run according to specs, I had custom injector made for the compression
This little entec needs regular tightening of the valves and all the nuts. The fuel
solenoid is finicky due to the high vibration.
Once caution is the fresh water tank
does not have a breather with a reservoir. So I avoid filling the water to the max and allow some room for expansion or it may create undue pressure and cause leaks
in other areas.
After spending 2.5k (for lots of spare parts
on entec and a new March water pump etc) I came across a Northern Light look alike - a used Kohler 3 cyclinder with 51 hours only. Could not resist the price
and paid for the genset in Feb 2015. Just took delivery
in Jan 2016 and installed the kohler genset in the boat below floor board forward of the main engine.
Since I liveaboard
and on the move with no space/house to keep the good old entec, I have since stripped the entec for parts ie the head
block, injector, valve, valve spring, hx, parts for the pump and the custom injector fitting for compression
test. Will sell them later when I have the time.
Let me know if you need more information on the performance of this unit. My only grip with this machine is I think the 4.2kw rating is a little too optimistic. When the unit gets heated up, the actual output drops - pretty much expected from a single cylinder with a large flywheel. I use it to run the AC so that means running this unit more than an hour - which is not good.
I like all the safety
shut down features and yes do keep a few spare of capacitors.
The best feature of this little genset is the size and its simplicity.