Kendo11 Posted February 1, 2017 Share Posted February 1, 2017 Thought you chaps may like to have a look at what happened to me earlier this week. Basically my water pump jammed somehow causing the viscous clutch fan to shear itself straight off the shaft, slicing a belt and obliterating the fan shroud into roughly 1000 pieces. Absolutely no idea what caused it but luckily for some reason I had the foresight to have ordered a new water pump just before Christmas. Luckily I had just made it to the spray shop rather than hurtling down a motorway or something. Answers on a postcard as to what may have caused this. (replacement clutch, belts and other bits on the way to go with the new pump). Quote Link to comment Share on other sites More sharing options...
T2 MSW Posted February 1, 2017 Share Posted February 1, 2017 Ouch Not good at all. Any other damage or you spot it before it over heated?? Quote Link to comment Share on other sites More sharing options...
BoGlE Posted February 1, 2017 Share Posted February 1, 2017 Wow. Would like to know why it suddenly seized like that Quote Link to comment Share on other sites More sharing options...
Kendo11 Posted February 1, 2017 Author Share Posted February 1, 2017 Ouch Not good at all. Any other damage or you spot it before it over heated?? Non aside from the unit itself, shroud, clutch and belt. Well at least as far as I can tell Quote Link to comment Share on other sites More sharing options...
Kendo11 Posted February 1, 2017 Author Share Posted February 1, 2017 Wow. Would like to know why it suddenly seized like that /QUOTE] Same! Never heard of it before Quote Link to comment Share on other sites More sharing options...
absz Posted February 1, 2017 Share Posted February 1, 2017 Don't think them bolts are standard on the waterpump flange I'm sure its studs that screw onto the flange itself Quote Link to comment Share on other sites More sharing options...
evinX Posted February 2, 2017 Share Posted February 2, 2017 No undertray..water getting onto it and causing corrosiom over time? Knackered fan clutch putting extra strain on the pump? Non oe? Quote Link to comment Share on other sites More sharing options...
Ric Posted February 2, 2017 Share Posted February 2, 2017 Did you have antifreeze in the coolant? or just water? possible that it froze? Quote Link to comment Share on other sites More sharing options...
Kendo11 Posted February 2, 2017 Author Share Posted February 2, 2017 Normal coolant as far as I remember and I'm not aware as to whether it was oem or not Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted February 2, 2017 Share Posted February 2, 2017 Coolant gets into the bearings through tired seals, bearings heat then seize, inertia sheers off shaft. Or viscous unit is knackered and allowing fan and unit to be out of balance fatiguing shaft over time. Does the pump still turn freely? Quote Link to comment Share on other sites More sharing options...
Kendo11 Posted February 2, 2017 Author Share Posted February 2, 2017 Coolant gets into the bearings through tired seals, bearings heat then seize, inertia sheers off shaft. Or viscous unit is knackered and allowing fan and unit to be out of balance fatiguing shaft over time. Does the pump still turn freely? Relatively freely. I have a new pump, fan clutch and a thousand other bits too. Once the pump is removed are there any markings to show whether it's OEM or not? Any recommended tests to identify the issue in case it's related to anything else? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted February 2, 2017 Share Posted February 2, 2017 Right, I put my glasses on, we have a text book ball bearing seizure failure here. See the heat bluing on the shaft and flange? See where the shaft has failed at the base of the U channel where the balls run? And the granular nature of the break is typical of torsional shear? The bearing partially seized, got MAD hot, seized totally, and inertia span the viscous unit and fan off shearing the shaft at the base of the groove, which was probably red hot at the time. Coolant leakage cooled it and the pump is now free as the bearing is effectively none existent now. A new pump will come with proper studs for the flange rather than the Heath Robinson bolts. Check the viscous is neither seized nor too free, has no axial or radial play and is quiet, and it should run again. Quote Link to comment Share on other sites More sharing options...
T2 MSW Posted February 2, 2017 Share Posted February 2, 2017 Not a fan of Heath Robinson jobs then Chris?? Quote Link to comment Share on other sites More sharing options...
Kendo11 Posted February 4, 2017 Author Share Posted February 4, 2017 Right, I put my glasses on, we have a text book ball bearing seizure failure here. See the heat bluing on the shaft and flange? See where the shaft has failed at the base of the U channel where the balls run? And the granular nature of the break is typical of torsional shear? The bearing partially seized, got MAD hot, seized totally, and inertia span the viscous unit and fan off shearing the shaft at the base of the groove, which was probably red hot at the time. Coolant leakage cooled it and the pump is now free as the bearing is effectively none existent now. A new pump will come with proper studs for the flange rather than the Heath Robinson bolts. Check the viscous is neither seized nor too free, has no axial or radial play and is quiet, and it should run again. Makes sense. New pump does indeed have the correct studs as opposed to bolts. Possibly a bodge in previous ownership somewhere down the line. Quote Link to comment Share on other sites More sharing options...
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