Coming slow up the farm drive the other day after a long hard run I noted that the V12’s temp began to rise a little. 85C up to 87C on the B thermostat and 83C to 85C on the A side. No big deal on its own but idling outside the shed it reached around 92C and 89 respectively, motor still running. This is unusual. The day was about 34C so one could expect some temp increment but the real oddity was that the auxiliary fan didn’t come in. The auxiliary fan operates off the out flow temp of the radiator and is set to 80C. ??inlet coolant filters obstructed.
When I made the change from the coarse to the fine TEFBA filters (as per manufacturer’s instructions) in May this year during the initial filter clean out (TEFBA coolant filter results…. posted May 2018 ), I was concerned how restrictive the fine mesh filter might be. Considering the borderline nature of the XJS it wouldn’t take much gunk and/or silica to cause flow problems. I promised myself then, that I would check them in a couple of weeks but here we are 7 months later and I’m just doing them. My delay in checking them is that I have only travelled about 3000 kilometres.
Pic 1-3 the fine filters as removed today. Obviously a lot of the mesh is blocked.
Pic 4 the silica from the filters in May (LT) and DEC (RT)
Much of the silica etc was in the lower catchment and not in the mesh. I suspect that much of this may have been on the mesh during coolant flow.
Owing to the observation that the fine filter blocked in so few kilometres I have opted to use the coarse filters for the moment. The question that could be asked is that is this something that was going to continue (motor will eventually dissolve into the filters) or is it still the motor cleaning itself out since the flow improvement. Also, considering another block flush or even removing the heads for a gunk-out.
I would be interested in your observations.
PS we will see how she runs tomorrow.