Thread: Td5 water pump hose to coolant rail - clearance around coolant hose

Originally Posted by onebob

As part of a comprehensive refurb I have gutted the engine bay of all the coolant system components (coolant radiator, hoses, thermostat, coolant rail, water pump etc) and will replace them all with new ones PLUS a new intercooler and an auxillary auto trans cooler with all new pipes and hose. I’m currently pre-planning ahead of starting the re-assembly and was wondering just how congested is the area surrounding water pump hose where it runs between the water pump cover plate and the bottom coolant rail. Eighteen months have passed since pulling it all out and I can’t remember enough to be able to visualise it. Can someone slip under their D2 and eyeball the area and let me know. I’m considering inserting a temp sender adaptor in the water pump coolant hose if it can be done without creating rub points. If it were possible to get a hand in and grasp the pump hose that would give me an idea …..
cheers
Rob

Rob, unsure as to why you want to locate a temp sensor there as this is the 'cold' side of the waterpump. There is enormous amount of room there, it was where I finished installing the Electric Water Pump (EPW) rather than the lower radiator where it caused flow problems. If you were to install a sensor it would not cause a rubbing issue if done with a modicum of care. Here is a shot of the EWP installed (cut the front rail to locate it but you will see the clearance up to the block inlet. But you can see that there is a fair bit of room around the hose without issues

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But really you should be looking at the top hose from block to the radiator to get the most accurate temp as to overheating issues. This here is the set I have with the Sensor for the EWP and Low Coolant Alarm, but I do not have the down pipe to thermostat. That said, the distance from the down hose to the bleed thread should be sufficient to fit a temp sensor I would suggest. The one supplied with EWP controller actually had a bleed hole but I liked the fact the silicon pipe was raised for bleeding the system.

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There is a sensor I know that you can screw into the radiator housing and set the probe in from there.

The temp differences between this reading and Nanocom Read system temp are roughly 5-15C very rarely are they matching as the fluid temp is higher than the block reading.

Thank you for the pics and putting yourself out to get them for me. As to why I would want to measure coolant temp before the water pump, it is because now with a new radiator, new thermostat, new water pump and a near new viscous fan coupling it’s the perfect opportunity to set things up so I can observe in real time, under various conditions how the coolant temperature is managed from Radiator temp gradient thru to the blending function of the thermostat and it’s effect on moderating the circulating coolant temperature - and in addition also having the temp sensor before the water pump will allow me to see engine entry coolant temps when the thermostat is fully open and bypass is closed. The learnings from this will inform my upcoming thermofan installation. Currently I can see engine exit coolant temp via my Hawkeye diagnostic tool and cylinder head temp via my Engine Watchdog.