JD 5403 engine block coolant drain plug

/ JD 5403 engine block coolant drain plug #1  

redkar

New member
Joined
Oct 3, 2025
Messages
6
Tractor
JD5103, JD5403
I have searched the net and cannot find answer. Where is the engine block drain plug for coolant antifreeze? I see a bolt head on the left side of the engine near the fuel pump, but not sure that's it. TBN is a great site. Thanks.
 
/ JD 5403 engine block coolant drain plug #2  
Last edited:
/ JD 5403 engine block coolant drain plug
  • Thread Starter
#3  
Welcome to TBN


Some photos or two of the "bolt" head that might be a block drain would possibly help someone clarify for you.

Try this link to see if it helps.
Thanks for the reply. The procedure in the link is in the owners manual. Removing the thermostat requires removing several other items. Not a quick, easy task. I was hoping to simply drain the block and the radiator, flush and refill coolant.
 

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