Author Topic: draining coolant 5A  (Read 2449 times)

Offline codretaw1

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  • 1965 mci 5A south lyon, michigan
draining coolant 5A
« on: April 04, 2013, 03:08:43 PM »
hi guys any tricks on drainig coolant from 8v71 replacing hoses and thermostats also flushing rads

Offline bevans6

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  • 1980 MCI MC-5C
Re: draining coolant 5A
« Reply #1 on: April 04, 2013, 04:17:58 PM »
My 5C has a drain plug on the lowest coolant tube leading towards the water pump.

Brian
1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
Allison MT-647
Tatamagouche, Nova Scotia

Online lostagain

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Re: draining coolant 5A
« Reply #2 on: April 04, 2013, 04:44:18 PM »
Mine doesn't have a convenient plug. I remove a hose that is low and let it drain in a pan.

JC
JC
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1977 MC5C, 6V92/HT740

Offline Ed Hackenbruch

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Re: draining coolant 5A
« Reply #3 on: April 07, 2013, 11:02:10 AM »
When you refill, if you do it slowly and give the water time to settle down thru all of the lines, you can avoid having an air lock somewhere.  :)
1968 MCI 5A with 8V71 and Allison MT644 transmission.  Western USA

Offline luvrbus

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Re: draining coolant 5A
« Reply #4 on: April 07, 2013, 11:09:04 AM »
Most should all have a drain plug at the bottom of the oil cooler on a 71 or 92 series or on the connection to it
Life is short drink the good wine first

Offline codretaw1

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Re: draining coolant 5A
« Reply #5 on: April 14, 2013, 12:21:57 PM »
thanks guys found drain at lower rad tube , all done new thermo stats and all new hoses

Offline bevans6

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Re: draining coolant 5A
« Reply #6 on: April 14, 2013, 01:36:44 PM »
Make sure you open the tap on the cross-over tube between the two thermostat housings to let the air out.  You will probably find it takes a while for the coolant level to settle down as the air works it's way out of the engine.  You may have to bleed the driver's heater at the front of the bus if you got air in that system.

Brian
1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
Allison MT-647
Tatamagouche, Nova Scotia