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 Post subject: Oil in coolant overflow
 Post Posted: Thu Sep 13, 2018 12:20 pm 
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Hornet Warrior
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Joined: Fri Dec 01, 2006 6:50 pm
Posts: 217
Location: S.W. London
Hi folks,

Just thought I'd canvass opinion on places where oil could get into the coolant system. The bike runs fine, I only noticed it when topping up the reserve tank. I know that head gasket would be pretty bad (but I assume if that had gone, there might be running issues etc).

The water pump is only two years old (I changed that after the mechanical seal failed), but it's on my list of things to check. Any other interfaces that could be checked?

Cheers
John


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 Post Posted: Thu Sep 13, 2018 2:26 pm 
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True Horneteer
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Location: In The Garage
Yeah - check the oil cooler - this is a heavy coolant/oil interface with a lot of seals and gaskets present to keep oil and coolant from mixing - if any of these seals and gaskets fail then you are looking at oil/coolant bleeding into each other.

Check out this recent thread for more info on the oil cooler set up:

http://www.hondahornet.org.uk/messageboard/viewtopic.php?f=60&t=34000&p=291469#p291469


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 Post Posted: Wed Oct 03, 2018 7:45 am 
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Hornet Warrior
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Just what HOON said. Been there, done that. :)

_________________
Honda Hornet CB600F 1999
Honda Hornet CB600F 2005


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 Post Posted: Mon Dec 10, 2018 1:34 pm 
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Hornet Lord

Joined: Mon Sep 23, 2013 11:39 am
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Location: Coventry/Sometimes Blackburn
Same with mine. Check if there is coolant in the oil. If not, its the o-rings in the oil cooler getting flattened and not sealing as well. The oil leaks into coolant and not the other way round because the oil system is at an higher pressure than the coolant system.


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 Post Posted: Mon Dec 10, 2018 7:31 pm 
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True Horneteer
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Location: In The Garage
Quote:
The oil leaks into coolant and not the other way round because the oil system is at an higher pressure than the coolant system.


Good to know :D

On balance I guess it's better to have oil in coolant than coolant in the oil (not that you want oil in your coolant for any length of time).


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