Somkid Posted October 15, 2021 Report Share Posted October 15, 2021 Hi, I have a Sherco 2.9 - its around 2008. Does anyone know the purpose of the small round hole (see picture) that is in the engine casing just below and in front of the water pump? mine starting leaking some 'foam' after I'd submerged the bike a bit, This was due to some water having mixed in with the gearbox oil.. That's all changed and bike running fine, luckily water was clean and I sorted it quickly. Changed the oils, cleaned airbox and have flushed the rad as i suspected oil may some how of got in there (hence white foam). Hole still weeps a couple of drips, clean water now, not foam - but only now and then. I don't know what hole is designed to do - or if its on the water side (its close to pump, or oil side... Could easily just block the hole - but it must serve some designed purpose. Thank you! Quote Link to comment Share on other sites More sharing options...
petert Posted October 15, 2021 Report Share Posted October 15, 2021 I suspect that is for bleeding the cooling system. Remove the bolt clean around the area thoroughly and replace using a new copper washer 1 Quote Link to comment Share on other sites More sharing options...
b40rt Posted October 15, 2021 Report Share Posted October 15, 2021 (edited) At a guess, it's a tell tale that you have a failing seal on your water pump. Edited October 15, 2021 by b40rt 4 Quote Link to comment Share on other sites More sharing options...
tshock250 Posted October 15, 2021 Report Share Posted October 15, 2021 Water pump seal failing as b40 says. 1 Quote Link to comment Share on other sites More sharing options...
zippy Posted October 15, 2021 Report Share Posted October 15, 2021 I believe it is a designed "weep hole" to indicate failing water pump seal(s) as stated by b40rt and tshock250 If I remember correctly that is a 2 seal design, a seal for the coolant side and a seal for the oil side with a gap between. The weep hole is situated in the gap between the seals. Benefit is you can tell which seal is bad by what is leaking out of the weep hole. but I would suggest changing both seals, because they have both been in there the same length of time with same use etc.. 1 1 Quote Link to comment Share on other sites More sharing options...
Somkid Posted October 15, 2021 Author Report Share Posted October 15, 2021 Thanks to all for the replies. I'll Google what's involved in changing the seals. Quote Link to comment Share on other sites More sharing options...
stevec Posted October 15, 2021 Report Share Posted October 15, 2021 This is for earlier Shercos but might still apply. water_pump_seal_replacement.pdf Quote Link to comment Share on other sites More sharing options...
Somkid Posted October 16, 2021 Author Report Share Posted October 16, 2021 Thank you. Petfect Quote Link to comment Share on other sites More sharing options...
cgunzelman Posted November 10, 2021 Report Share Posted November 10, 2021 On 10/15/2021 at 11:55 PM, Somkid said: Thank you. Petfect Is yours actually leaking? Looks pretty dry in the pic. Quote Link to comment Share on other sites More sharing options...
Somkid Posted November 12, 2021 Author Report Share Posted November 12, 2021 It was, I fitted new water side seal, all good now thanks 1 1 Quote Link to comment Share on other sites More sharing options...
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