Hello.

I am installing a new water pump in my mothers 1998 XJ8. I need the new torque setting for the .40 mm crush gasket.

Please note I am installing the (updated version) water pump with the new gasket, metal impeller and no plastic parts.

The updated water pump has a .40 mm 'crush' gasket and no o-ring.

As many of you may well know, the original equipment water pump had a 1.5 mm gasket with rubber inserts imbedded into the gasket. It also had an inferior plastic impeller and a plastic housing where 2 O-rings reside. Both of the latter result in the water pump failing prematurely.

Because I am installing this newer designed .40 mm crush gasket I need the new torque settings.

This is my second attempt to get a crush gasket to seal properly. During my first attempt I did not have the torque settings and thus did not torque the last crush gasket correctly and caused an improper seal and consequently a minor leak to develop. I have had to wait 3 weeks to complete this otherwise simple water pump replacement, due to shipping delays on receiving a replacement crush gasket.

I am quite confident that the torque settings provided in the JTIS 21 CD are for the old design of water pump. The torque setting of 8Nm + 90 degrees turn, is for the 1.5mm gasket with rubber inserts. That is not the correct torque range for the new crush gasket of .40mm

I realize I need to tighten the bolts in a star pattern.

Please help. I don't want to ruin another crush gasket and turn this into a month long project.

Thanks for your time reading the above and for the correct torque setting.

 

First off, ensure the mating surface is spotless and flat, I use a straight edge block and crocus paper/water.
Torque values for water pumps are CORRECT, 12 N/m for the pulley.