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MEP-8xx oil draining info

Daybreak

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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.
oil drain pipe to hose for skid based.jpg

For trailer mounted MEP-8xx gensets, part of the BII
pipe to hose fitting should have been installed.
oil drain pipe to hose for trailer.jpgoil drain pipe to hose for trailer 1.jpg
 

Daybreak

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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

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

Daybreak

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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

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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).
 
Last edited:

Light in the Dark

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Last edited:

Daybreak

2 Star Admiral
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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.
 

jimbo913

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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?
 

Ray70

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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

Active member
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Location
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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.
 
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