MEP-805B Oil in coolant

[Guyfang]

ABEZ	GRIPPING ACCOMMODATION TYPE	ANY ACCEPTABLE
ABKV	OUTSIDE DIAMETER	4.625 INCHES NOMINAL
ABKW	OVERALL HEIGHT	1.500 INCHES NOMINAL
AGEJ	SYSTEM FOR WHICH DESIGNED	PRESSURIZED
AGEX	CAM QUANTITY	3
AGEZ	RETAINING DEVICE TYPE	CHAIN
AJQT	RETAINING DEVICE LENGTH	7.000 INCHES NOMINAL
ALGN	PRESSURE RELIEF METHOD	MANUAL
BPHD	MAXIMUM WORKING PRESSURE	3.000 POUNDS PER SQUARE INCH
CBBL	FEATURES PROVIDED	BREATHER HOLE AND SUBMERSIBLE
CQST	FILLER NECK DIAMETER FOR WHICH DESIGNED	2.375 INCHES NOMINAL
MARK	SPECIAL MARKINGS	VALVE INSIDE,OPEN-NORMAL CLOSED,FORDING-VAPOR LOCK
MATT	MATERIAL	ANY ACCEPTABLE OVERALL
PRPY	PROPRIETARY CHARACTERISTICS	PACS
SFTT	SURFACE TREATMENT	ANY ACCEPTABLE OVERALL
STYL	STYLE DESIGNATOR	OUTSIDE CAM TYPE
ZZZT	NONDEFINITIVE SPEC/STD DATA	2 TYPE

Above is info on the cap.

We used liquid simple green to get oil out of the radiator. Seemed to work well.

 

[baxter462]

Thanks Guy!

Where it says, "cam quantity 3," does that refer to the lugs that engage with the cam ramps on the filler neck? I swear I only saw two lugs last night, but I'll look again tonight when I get home.

Do you think that might be for the fuel cap? I just realized that is a very large outside diameter too.

 

[Guyfang]

Ahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh!

Yes thats for the fuel cap. I was looking at an old list I made up for every gen set, so I didnt have to look at the parts manual all the time. I will see if I can can come up with tech info on the cap. I am cooking right now, no time!! Be back later!!

 

[155mm]

155mm, you didn't happen to replace the cooling system cap on either of the 805Bs you were working on last year, did you? I'm not having much luck so far trying to find a generic alternative that will work.

the 805b shows a 10# cap, the 804a shows a 7# and the 005a shows a 7#. I did not have to find a cap for the 805, but i did have to build a new gasket to go in it, the original had dry rotted, so i just cut a new one from an old inner tube.

I dont see anything special about the cap, other than the outside is kurled and doesn't have ears. There appears to be enough room to use a standard 'eared' cap.

 

[155mm]

Ahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh!

Yes thats for the fuel cap. I was looking at an old list I made up for every gen set, so I didnt have to look at the parts manual all the time. I will see if I can can come up with tech info on the cap. I am cooking right now, no time!! Be back later!!

Since i am 4000 miles away, I am going to say.... you think that was a senior moment?

 

[Guyfang]

Must have been a senior moment, I hadn't opened up my nightly beer yet.

There should be room to use any cap there. Sometimes we got them with ears, sometimes not.

Your day will come too!

 

[baxter462]

I tried a couple other caps I had laying around, and they all had too large of lugs. Knowing that it is a 10 psi cap certainly helps! I should be able to match one up pretty easily at NAPA with that info. I knew a lot of the other generators use a 7psi cap (such as my 802a), but the 805B was a mystery.

Looks like a Gates 31309 or Stant 10283 might work.

 

[baxter462]

The two part numbers above are not correct. They are really close, but they don't have the large diameter seal for the very top of the filler neck that is required since the generator has a coolant overflow bottle. The correct part number is Stant 10293 if anyone else with an 805B ever needs a radiator cap.

 

[baxter462]

I put the generator back together over the weekend with the new oil cooler o-rings and gaskets, changed the oil, flushed out the cooling system, added new coolant and replaced the cap. Ran it for a few hours with a 20kW load. So far, so good. Thanks everyone for the advice. I think it is fixed.

 

[155mm]

What did you end up using as a flushing media? and how much did you use?

 

[baxter462]

I flushed it twice. First, I used about half a gallon of simple green, then I drained it, rinsed with water, then I used some prestone cooling system flush. I was going to try some powdered laundry or dish detergent, but I already had simple green and the prestone flush, so I figured I might as well use that. It worked pretty well, but there is still a tiny bit of oily residue. I think if I wipe out the filler neck and the bottom of the cap before each use, it'll probably all be gone soon enough.

 

[Guyfang]

Whenever we had this problem, it always was a problem with the radiator being the last place the oil hung up. On gen sets, I simply flushed 1-2 times and wiped the radiator neck out once or twice a month. Sooner or later, most of it came out. Once I ran the set for a month, and let the hot coolest out into a filter I rigged up. Put the coolest back in and called it a day. On HEMMT A5 trucks, you had to remove/replace the radiator anyway, to fix the problem if the coolest/oil was mixing, as it was 99.99% the radiator's fault. I never liked to pressure wash a radiator. Saw a few damaged that way. I think you will be good as it is.

 

[jmenende]

Hi Guys, quick question. Is there a preferred coolant brand and type for my Mep 805B? Im also looking for the best motor oil you would recommend. Thanks

 

[155mm]

so are trying to start a fight amongst friends?

any is good as long as you keep it tested and sca/dca up to proper level

 

[uniquify]

Is there a preferred coolant brand and type for my Mep 805B? Im also looking for the best motor oil you would recommend. Thanks

There are lots of brands that can work.

Since it has a John Deere engine in it, your local agriculture or construction dealership should have the appropriate fluids. No idea what they'll charge you though.