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3.13.1 - Fitting a XJ6 4.2 water pump to a 3.8 ( Paul Saltwick,  March 11, 2004 )

I know this has been covered before, but can someone remind me which version XJ6 timing cover do I need to get to use an XJ6 water pump on my 3.8?

Hello Niels,

As usual, it depends. There are at least four different XJ-6 pumps, so you are better off getting a timing cover that matches the pump, all the timing covers will fit the block. The problem will be the radiator clearance and the fan. I think the last pump with the final improved impeller and larger bearing (S3) is too long for a small saloon and the pulley shaft is larger so you can't refit the original pulley. For the XJ-6, Jaguar increased the impeller diameter and thickness (3.04" vs 2.75" and 0.625" vs 0.5312"), improved the seal to allow higher pressure and increased the pump speed from 0.9 crank to 1.25 crank speed. Apparently, problems persisted and they improved the impeller again
and uprated the pump bearing and seal again and used an even smaller pump pulley. The best compromise for a 3.8 may be a mid XJ-6 pump and timing cover with the S3 crank damper and pulley. An old timing cover can be milled out, the dimensions should be in the archives. You also need to make a hose pipe adapter for the lower hose.


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