New water pump needed with cam/timing belt replacement?

Post by **coflynn** » 27 Jun 2013, 13:54

Many have argued in favor of replacement, reasoning "value of time and labor" is far greater price to pay

Almost all parts which haven't been burned-in follow a 'bathtub curve' (see http://en.wikipedia.org/wiki/Bathtub_curve). In my mind unless you are at pretty high miles where it's wearing out, you are equally likely to suffer a failure BECAUSE you replaced it as you are due to a premature failure. For my second timing belt change I may replace the water pump. Likewise if you aren't using OEM & getting an off-brand water pump (e.g. not AISIN), you may even be worse off...

Post by **DGM** » 28 Jun 2013, 08:57

Thanks “coflynn” for this link and all the information.

I do what "coflynn" proposed. Volvo water pumps have acquired good reputation over the years and they are reliable compared to other domestic products or Asian counterparts.

As a rule of thumb they are normally replaced every other timing belt change. It makes sense since Volvo has extended its timing belt interval on P2 models.

The pump when failing let’s escape fluid through a weep hole near the input shaft. The water then follows a channel made in the belt casing to exit at the bottom near the right axle. It can be traced by looking for white residue left by the coolant when drying.

If the coolant is replaced periodically with a quality product (ex: Volvo or Zerex G-O5) the water pump should normally last two cycles. Personally I prefer Aisin since it is OEM.

537playing · Post by **537playing** » 28 Jun 2013, 21:02

IMO
The timing belts are in great condition at the suggested replacement. I have two Volvos and wondered why I changed the belts after seeing their conditions. Its all about peace of mind.
But to change the water pump seems unneccessary. I've read where the replacement water pumps failed very quickly because they were made from inferior parts and tolerances.
I would keep these water pumps in place until they fail. I have yet to read about someone's original pump fail!
Perhaps this suggestion of replacing water pumps with timing belts are for other car makers.