2002 Honda CRF 450 R Logo
Posted on Jan 13, 2010
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I have antifreeze leeking out a pin hole under the water pump

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  • Posted on Jan 13, 2010
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Hi there. Your problem is a common thing on all watercooled motorcycles. The coolant leaking out of the small hole( by-pass hole ) located directly under the water pump, is indicating that your water pump seal is leaking.
If the water pump seal leaks, coolant will leak out of this hole to indicate this problem.
There is also a seal on the same shaft ( called the back-up seal ) on the inside of the clutch cover to prevent two things from occuring.

  1. In the event of the waterpump main seal leaking, coolant will leak from the by- pass hole & the pack-up seal prevents coolant entering the gearbox.
  2. The back-up seal prevents gearbox oil from entering the back of the main water pump seal. If this seal leaks, oil will leak out of the by-pass hole.
You will need to replace the waterpump seals ( both main & back-up ) as well as the bearing that you will need to remove during the process.If you undertake this job yourself you will need to remove the clutch cover to do so.

I have outlined the cause of your leak & can further assist you if you intend to DIY, but I suggest you would best have a workshop manual to assist you in doing so.
Any further questions please don't hesitate to ask!

Regards Andrew Porrelli

mxtras

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  • Expert 194 Answers
  • Posted on Jan 13, 2010
mxtras
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It is very likely the water pump seal. It is always a good idea to replace the bearing while you have it opened up.

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