Why the water pump went on my 2009 a theory - Page 2 - Toyota Yaris Forums

DarkShadowFox · 08-06-2018, 10:16 AM

the engine itself isnt really designed to race in the beginning. try adding a coolant with a higher boil off point and a TRD sport thermometer.

unfortunately you have to get the Sport thermo from japan.

CoryM · 08-06-2018, 01:45 PM

I bought my car when it was 3 years old with under 40,000km, and the belt had some cracks in it already. I left it on for as long as possible because:
-I know the w.pump bearings are weak and didn't want to replace the w.pump.
-I was curious to just how bad a modern belt can get before it breaks.

I replaced the belt a few months ago as I was doing a couple track days in it and didn't want to risk a mechanical issue. I used a good belt, and was as light as possible on belt tension (to the point that I actually had to adjust it a few days later... I am a mechanic and haven't had to re-adjust a belt in years). Car now has 100,000 km, 9yrs, ~100 autoX events, two track days, two days of TSD rally on the OE water pump. I don't think driver abuse is the cause of the failure. Most cars have auto-adjusters on them and belts last much longer than they used to. I think people just don't remember/know how to manually tension belts anymore. Not a poke at anyone, just an observation. I would also expect if everyone looked at their maintenance records there would a correlation between belt replacement (or belt R&R) and w.pump replacement less than a year later.

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08-06-2018, 10:16 AM	#1
DarkShadowFox Banned View User's Garage Drives: 2015 Yaris LE 3door 1F7 Join Date: Feb 2017 Location: Massachusetts Posts: 963	the engine itself isnt really designed to race in the beginning. try adding a coolant with a higher boil off point and a TRD sport thermometer. unfortunately you have to get the Sport thermo from japan.

08-06-2018, 01:45 PM	#2
CoryM Drives: 2009 5-door, 5-speed Join Date: Sep 2011 Location: White Rock BC Posts: 687	I bought my car when it was 3 years old with under 40,000km, and the belt had some cracks in it already. I left it on for as long as possible because: -I know the w.pump bearings are weak and didn't want to replace the w.pump. -I was curious to just how bad a modern belt can get before it breaks. I replaced the belt a few months ago as I was doing a couple track days in it and didn't want to risk a mechanical issue. I used a good belt, and was as light as possible on belt tension (to the point that I actually had to adjust it a few days later... I am a mechanic and haven't had to re-adjust a belt in years). Car now has 100,000 km, 9yrs, ~100 autoX events, two track days, two days of TSD rally on the OE water pump. I don't think driver abuse is the cause of the failure. Most cars have auto-adjusters on them and belts last much longer than they used to. I think people just don't remember/know how to manually tension belts anymore. Not a poke at anyone, just an observation. I would also expect if everyone looked at their maintenance records there would a correlation between belt replacement (or belt R&R) and w.pump replacement less than a year later.