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hornet_guy |
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hornet_guy Two Stroke Sniffer
Joined: 24 Jan 2021 Karma :
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Posted: 20:24 - 21 May 2021 Post subject: Water pump o-ring leaking. Sealant? |
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Hello,
I replaced the water pump o-ring 1 year ago and now is starting to leak again (just drops for now). Assuming the o-ring is relatively new, I am considering 2 options:
1 - Cleaning the area and reinstalling the o-ring adding a good amount of gasket sealant around.
2 - Using sealant alone without the o-ring.
I know it shouldn't leak with the o-ring only as it was designed like that, but this is my case, and I want to ensure this doesn't happen again.
What do you think? What would you do?
Thanks
https://i.imgur.com/E8P2DIu.png |
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Tdibs |
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Tdibs Traffic Copper
Joined: 16 Jan 2015 Karma :
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jeffyjeff |
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jeffyjeff World Chat Champion
Joined: 02 May 2020 Karma :
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jaffa90 |
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jaffa90 World Chat Champion
Joined: 06 Apr 2016 Karma :
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hornet_guy |
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hornet_guy Two Stroke Sniffer
Joined: 24 Jan 2021 Karma :
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Pete. |
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Pete. Super Spammer
Joined: 22 Aug 2006 Karma :
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Posted: 13:17 - 22 May 2021 Post subject: |
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O-rings need no sealant. Causes of them not sealing are shrinkage, damage, uneven clamping and a poor sealing face.
Since you replaced it a year ago it won't be shrinkage. Unlikely to be damage too so that leaves uneven clamping and had sealing face.
Remove the cover and inspect the face. If it has any corrosion depsosits or surface damage you'll have to clean it up. A soft wire brush will do a good job on aluminium (but a hard one will score it).
If the face that the o-ring seals onto (and the groove it sits in is clean) then it might be that the cover is warped. This might be just one of those things or it could be that it's bee over-tightened or tightened up without being properly cleaned.
Put up a photo if you're not sure. Show the o-ring, the groove and the face it seals onto. ____________________ a.k.a 'Geri'
132.9mph off and walked away. Gear is good, gear is good, gear is very very good |
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hornet_guy |
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hornet_guy Two Stroke Sniffer
Joined: 24 Jan 2021 Karma :
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jaffa90 |
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jaffa90 World Chat Champion
Joined: 06 Apr 2016 Karma :
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Pete. |
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Pete. Super Spammer
Joined: 22 Aug 2006 Karma :
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bikenut |
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bikenut World Chat Champion
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Pete. |
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Pete. Super Spammer
Joined: 22 Aug 2006 Karma :
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Posted: 10:07 - 23 May 2021 Post subject: |
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Generally speaking o-ring sealed faced always touch. The o-ring groove is sized so that when the mating face is touching the top of the groove the o-ring is properly compressed, it's all in the spec for making o-ring grooves. Foreign matter in the gap (often aluminium oxide on bikes especially water pumps and more especially where the coolant has been replaces with just water) can hold the faces apart and cause the bolt lugs to bend, then the faces will nevr touch. ____________________ a.k.a 'Geri'
132.9mph off and walked away. Gear is good, gear is good, gear is very very good |
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MCN |
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MCN Super Spammer
Joined: 22 Jul 2015 Karma :
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Posted: 12:30 - 23 May 2021 Post subject: |
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New O-ring was possibly nipped on assembly.
Maybe it's the water pump Mechanical Seal is leaking.
The water pump should have a tell-tale (weep) hole near it's lower area.
This allows coolant that leaks past the mechanical seal to drip out the pump housing rather than pass through into the oil side.
If it has a seal and the sealing areas are sound then no sealant is required.
Some compounds can harm the seal material too so that should be considered.
Seals can break up or set hard like concrete.
All that should be applied is a lubricant. Either clean engine oil or some mild soap. ____________________ Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN. |
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sickpup |
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sickpup Old Timer
Joined: 21 Apr 2004 Karma :
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rpsmith79 |
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rpsmith79 World Chat Champion
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MCN |
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MCN Super Spammer
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Old Thread Alert!
The last post was made 2 years, 334 days ago. Instead of replying here, would creating a new thread be more useful? |
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