Kurt Posted March 4, 2019 Share Posted March 4, 2019 Just put a new rad on and went for a drive for 17 or so miles engine up to temperature. Popped the bonnet on returning home to check for leaks and have noticed the oil cooler pipes are cold? Is this normal? I did notice on taking my old leaking rad off that when I undid the bottom cooler pipe little oil came out I seem to remember more coming out in the past when I have had to remove it. Stuck thermostat maybe? The engine has been stood out of vehicle for over a year due to chassis upwards rebuild. Quote Link to comment Share on other sites More sharing options...
Ex Member Posted March 4, 2019 Share Posted March 4, 2019 You need to drive more than that for the oil to get up to the oil thermostat temperature. Quote Link to comment Share on other sites More sharing options...
Kurt Posted March 4, 2019 Author Share Posted March 4, 2019 Thanks Red90 I will try and give it a long run on the motorway tomorrow and re check. One thing that has passed through my mind is if I have got the pipes connected to the cooler positions correctly. I have the pipe that you would remove to access and remove the thermostat going to the bottom connection of the cooler can anybody with a 300tdi confirm this is correct? Quote Link to comment Share on other sites More sharing options...
monkie Posted March 4, 2019 Share Posted March 4, 2019 As Red90 says. Even though the coolant gauge may show the engine is at operating temperature, that doesn't necessarily mean the engine oil will be to temperature. Engine oil temperature lags quite alot behind coolant temperature. Quote Link to comment Share on other sites More sharing options...
Ex Member Posted March 4, 2019 Share Posted March 4, 2019 35 minutes ago, Kurt said: Thanks Red90 I will try and give it a long run on the motorway tomorrow and re check. One thing that has passed through my mind is if I have got the pipes connected to the cooler positions correctly. I have the pipe that you would remove to access and remove the thermostat going to the bottom connection of the cooler can anybody with a 300tdi confirm this is correct? Yes. I'm pretty sure it is impossible to fit them any incorrect ways. Quote Link to comment Share on other sites More sharing options...
western Posted March 4, 2019 Share Posted March 4, 2019 (edited) the upper oil cooler pipe/hose goes to the oil filter head rear connection nearest the engine block, the lower oil cooler pipe/hose goes to the oil filter head oil thermostat top hat housing next to the oil pressure switch IIRC the oil thermostat opens at 74 degrees, [that's stamped into the end of my 200tdi's oil stat body] Edited March 5, 2019 by western error amended Quote Link to comment Share on other sites More sharing options...
Kurt Posted March 5, 2019 Author Share Posted March 5, 2019 Hi Western. Is the 200tdi plumbed differently than the 300 though? I managed to find this pic online below of 300 tdi cooler lines. Shows the line from thermostat top hat to bottom connection this is the same as i have mine. Quote Link to comment Share on other sites More sharing options...
western Posted March 5, 2019 Share Posted March 5, 2019 I've gone by the diagram in parts book & looking at the pipe rear end connections.they match yours, my earlier reply is now amended. tap the top hat housing off & see if the stat & spring are fitted. 1 Quote Link to comment Share on other sites More sharing options...
Kurt Posted March 5, 2019 Author Share Posted March 5, 2019 Thanks western. I have ordered a new thermostat and o rings as the system is so simple i may as well replace at the same time as checking. Could be ok as i had not exactly been pushing the limits of the engine before i noticed the pipes were cold. Just a little stop start traffic and 30mph roads on my way home from work. Quote Link to comment Share on other sites More sharing options...
Kurt Posted March 6, 2019 Author Share Posted March 6, 2019 Quick update. Following a slightly more spirited drive to work this morning involving a few more hills the oil cooler does appear to be working as it should ( sigh of relief! ) Thank you everybody for the helpfull suggestions. 2 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.