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Longevity of HEPU pump?

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
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Longevity of HEPU pump?

Post by j-dawg » Sun Mar 05, 2017 10:22 am

I've started putting the engine back together after replacing the valve stem seals and I figured that, at ~60k miles, I might as well replace the timing belt while I have it off. Poking around, I noticed that the water pump is a HEPU unit.

Since I've just pushed the timing belt change off by 100k, this HEPU pump will presumably have 160k on it when I change the belt next (assuming the car is still with me at 365k, which is maybe a bit of a question mark). Would a HEPU pump be expected to make it this far? I actually have already bought an Aisin pump, but it wasn't cheap and I'd just as soon not mess with the water pump if it's fine as-is. Sleeping dogs and all that. I see no leaks and feel no play in the bearing.

The tensioner and idler are smooth and quiet, so I'm not planning to replace those. It sounds like water pump failure is the more common belt-snapper.
1999 V70 T5 5-SPD | ~270k mi | burns more oil than gasoline

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misha
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Re: Longevity of HEPU pump?

Post by misha » Sun Mar 05, 2017 11:59 am

I would leave it alone if it doesn't leak and bearing is good.
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Re: Longevity of HEPU pump?

Post by rspi » Sun Mar 05, 2017 1:32 pm

10 Years, 140,000. I have heard of some failing at 35,000, but they usually leak first.
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Re: Longevity of HEPU pump?

Post by beigg » Sun Mar 05, 2017 3:24 pm

I'd change it.
ugh smh 850 Turbo fridge

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Re: Longevity of HEPU pump?

Post by beigg » Sun Mar 05, 2017 3:26 pm

ugh smh 850 Turbo fridge

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Re: Longevity of HEPU pump?

Post by rguzz » Sun Mar 05, 2017 4:08 pm

They were better then than they are now.

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Re: Longevity of HEPU pump?

Post by wizechatmgr » Sun Mar 05, 2017 5:35 pm

If it were me I'd replace all of it. You're already in there - the last thing you want to do is have to be in there again...
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Re: Longevity of HEPU pump?

Post by erikv11 » Sun Mar 05, 2017 8:21 pm

Plus at 264k, if you don't install the Aisin pump now you may never get to it. In your shoes I would replace it, even though the water pump job is one of my least favorite when the engine is already installed. Remove the serp tensioner, it is super easy to do and opens up a lot more room for getting your hands in to the work space for the portions where you are working from above.
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Re: Longevity of HEPU pump?

Post by j-dawg » Sun Mar 05, 2017 9:28 pm

UGH FINE YOU GUYS I'LL DO IT
1999 V70 T5 5-SPD | ~270k mi | burns more oil than gasoline

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Re: Longevity of HEPU pump?

Post by beigg » Mon Mar 06, 2017 1:14 am

glad we could all shame you in the right direction!
ugh smh 850 Turbo fridge

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