5tondeuce

Hi all,
Can anyone tell me how to drain the cooling system in a NHC-250 cummins. I've looked through the tech manuals and searched the forum with no luck. I have already drained the radiator but I can not figure out how to drain the block. Thanks for the help!
Chris

WillWagner

The radiator is the lowest point, that should suffice. You will never get all the coolant out unless you pull the liners out of it. There is a 1/4 pipe plug at the exhaust side , rear of the engine. You can take that out, but it all still will not come out.

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73m819

there also a drain under the oil cooler

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Earth

If you're putting in a block heater then the 1/4 in plug Will mentions is lower than the plate for the heater. There was about a gallon in the block after I drained the radiator to install my block heater.

5tondeuce

Thanks very much guys, this helps alot

P.S. I had flushed the cooling system with water so I was just trying to get as much as I could out before I add antifreeze.
Thanks again for the replies
Chris

emr

Then make sure U take the WHOLE petcock out with a think a 9/16 open end, could have been 1/2 but it was a whole 4 weeks ago, ALOT more can come out if U do that,

DOCUSN1

Yep just like emr said pull the whole petcock and blow that out to. Dont forget to add your SCA and check its level when your done.Mark

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M101A1 TRAILER
XM818W/W TRACTOR 1970
XM818W/W TRACTOR 1970
MEP 003A GENSET

5tondeuce

Hi Mark,
At the cost of asking a stupid question, What does SCA stand for?
Thanks,
Chris

DOCUSN1

Hi Chris no cost as I belive the is no stupid question ever. SCA stands for supplemental coolant additive (if I spelled it right) your cummins diesel engine has what is called wet liners and the sca helps stop what is called cavitation, it will contain nitrates and help control PH. You can buy new antifreeze precharged or use regular and go to NAPA and buy a small can of additive. If you have a tractor suppy store near you they carry fleetcharge which is precharged with SCA and only costs 1 dollar more that regular antifreeze. Go to www.fleetchargeantifreeze.com for more in for on SCA and specs. If you have any questions feel free to ask, thats why we are all here to help each other out and enjoy our MV. Mark

__________________
M101A1 TRAILER
XM818W/W TRACTOR 1970
XM818W/W TRACTOR 1970
MEP 003A GENSET

5tondeuce

Hi Mark,
I did not know anything about this additive so thanks for the info.I am familiar with cavitation and ph. Is the cavitation caused from the vibration from a diesel engine.
Thanks again
Chris M

P.S. I bought heavy duty antifreeze from napa but I'm not sure if it is precharged but I will check.