MEP-8xx oil draining info

[Daybreak]

Howdy,

Any skid based MEP-8xx makes it difficult to do a oil drain. You can pick up a pipe to hose connector to temporally use to drain your oil.


For trailer mounted MEP-8xx gensets, part of the BII
pipe to hose fitting should have been installed.

 

[TNriverjet]

Great info Mike! Thank you. I will be doing this for my next oil change.

 

[Guyfang]

Works like a charm! No mess, no fuss.

 

[DiverDarrell]

I have done the same. Works great!!!

 

[Daybreak]

Howdy,
Any generator on a trailer should have the elbow and hose installed. It makes the oil change clean and painless.

 

[Light in the Dark]

What is the size of this elbow, or what thread dimension should I be looking for? Gravity drain without control sucks. Thanks!

 

[Daybreak]

Howdy,
I believe its 3/4"

NSN 4730-00-940-0947 part# MS24519-7 ELBOW,PIPE TO HOSE

You just need a 3/4" pipe to hose barb elbow. The hose is listed being 18 inches. I just installed a 3 ft piece and then cut it to where I wanted. So, the length would drop right into a 5 gal bucket.

 

[Light in the Dark]

Howdy,
I believe its 3/4"

NSN 4730-00-940-0947 part# MS24519-7 ELBOW,PIPE TO HOSE

You just need a 3/4" pipe to hose barb elbow. The hose is listed being 18 inches. I just installed a 3 ft piece and then cut it to where I wanted. So, the length would drop right into a 5 gal bucket.

I looked that up on another site, and came up with this

Nominal Inside Diameter Hose Accommodated (CWDW): 0.375 inches 2nd end

Nominal Pipe Size Accommodated (AAAR): 0.250 inches 1st end

Nominal Thread Size (CQJX): 0.250 inches 1st end Which a 3/8 NPT would have an OD of about .675 (3/8 ID). I bought two straight adapters at NAPA on my way home earlier... gonna try out the 3/8 and see if she works (and will report back).

 

[Light in the Dark]

Ok, so it was the 1/2" NPT fitting that works perfectly. NAPA didnt have anything in stock in right angle, but this one works great. Nickel plated and $3. Got a single ft. piece of rubber tube to fit over it and we are golden.

Draining and hopefully playing with my new 802A today.

Fitting - https://www.napaonline.com/napa/en/p/NTH90666/NTH90666
Hose (1ft) - https://www.napaonline.com/napa/en/p/WH_H10110/WH_H10110
and a .99 hose clamp

 

[Light in the Dark]

 

[Daybreak]

Howdy,

The trailer power units package came with a pipe to hose elbow for the purpose of draining oil. A generator skid can use this method too. Just a staright 3/4 pipe to hose barb piece works good to not have oil dribling along the side.

 

[c5jener]

View attachment 647760View attachment 647761

Like that idea - cheap and prob have all the parts in garage!

 

[Guyfang]

Thats what the elbow is for, and its a rather well thought out idea. But what ever works for you!! Main thing, you are happy with it.

 

[jimbo913]

I have seen everything from 3/8”NPT, 1/2”NPT and 3/4”NPT listed in this thread. Is anyone positive of the thread size at the outside genset housing so we can close this properly?

 

[Guyfang]

I assume you mean Item #1?

NOMINAL THREAD SIZE

0 1/2 INCHES EXTERNAL

 

[Light in the Dark]

1/2-14. The stock plug that goes into that drain hole I believe accepts the square shank of a 3/8" socket (though I feel like over the years I've also had machines in with an Allen wrench hex on the inside).

 

[jimbo913]

I assume you mean Item #1?

NOMINAL THREAD SIZE

0 1/2 INCHES EXTERNAL

View attachment 914044

Yes, 1 or 11. Thanks for confirming.

 

[jimbo913]

Yes, 1 or 11. Thanks for confirming.

Actually 1 or 6…

 

[Ray70]

LITD is correct that the fitting on the outer gen enclosure is 1/2" NPT.
The confusion might be due to a couple factors, the holes in the engine itself are 3/8" NPT threads and the 002/003 series machines are 3/4" NPT threads.
Now, to add to the confusion... EVERY trailer mounted 802 and 803 I have ever received with an ( always unused ) right angle fitting and extension hose in the tool box has been a 3/4" NPT thread. So it seems that somewhere along the line the military forgot that the oil drain thread went from 3/4" to 1/2" when they went from the 002/003 to 802/803.

 

[jimbo913]

LITD is correct that the fitting on the outer gen enclosure is 1/2" NPT.
The confusion might be due to a couple factors, the holes in the engine itself are 3/8" NPT threads and the 002/003 series machines are 3/4" NPT threads.
Now, to add to the confusion... EVERY trailer mounted 802 and 803 I have ever received with an ( always unused ) right angle fitting and extension hose in the tool box has been a 3/4" NPT thread. So it seems that somewhere along the line the military forgot that the oil drain thread went from 3/4" to 1/2" when they went from the 002/003 to 802/803.

Great point. I think my 803 had that hose in the trailer box and I recall it being very large and never using it.