Tag: water pump

S70 Replace Water Pump -

S70 – Replace Water Pump

Perhaps this may be obvious to the seasoned DIY’er’s or even some regular guys like me but after mulling it over and with the help of a couple of links I decided to tackle the Water Pump replacement by removing only the Hydraulic Tensioner. There were many other excellent links in the various Volvo forums (this one included) that some may find to be more helpful but the following provided me with the larger picture of what I needed to do.

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DIY: 1998 Volvo S70 Timing Belt Overhaul

The TB (Timing Belt) with 85K on it is still OK, has hairline cracks, but time to replace.
The TB factory Idler and Tensioner Pulleys have slight play and were “free-wheeling”, so time to replace
The WP has no leak, but the bearing has a very very slight play. Technically speaking, you can keep the WP for another 30K. From reading Ozark Lee’s and few others experience with leaking WP at 150K or so, and since I have no time to redo this in 30K, I put in a new Aisin WP.

Head Gasket Change Parts List

You want to do the valve seals while you’re at it. This is not an overkill because they are probably nearing the end of their life cycle and will develop oil seepage (just to make you feel regretful one day that you have to redo the gasket).
On another note, have you ever overheated the engine? Even if you haven’t, the mating surfaces for the head gasket need to be planed. There is usually a reason for the gasket to fail (and not always an apparent one).

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850 Turbo Timing Belt, Water Pump Replacement Marathon

Most of our time was spent on getting the timing marks to line up. We kept getting one tooth off and had to reset the tensioner three times. You can do that fairly quickly if you turn the vise a few degrees till you get resistance, wait a moment, turn again, repeat until it’s back in. I suppose some sort of hydraulic goo is in there that needs to squish back in through a baffle or something.