will4x4 Posted January 9, 2014 Share Posted January 9, 2014 Hi Guys, I have a problem with my 300tdi engine - 120k miles. i have an aftermarket oil cooler and pipes which has worked fine for 2 years however now its building lots of pressure and blowing the ends off. couple of points to note: the oil cooler is not blocked the pressure is high in both return and flow pipe i have changed the oil filter Any ideas why this is happening? - i dont have an oil pressure gauge but i know the flow never used to swell the pipes like that...there must be some reason why the pressure is higher... Any ideas as im really stuck on this one. thank you Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 9, 2014 Share Posted January 9, 2014 Sounds like whatever regulates the pressure is stuck. Quote Link to comment Share on other sites More sharing options...
Tanuki Posted January 9, 2014 Share Posted January 9, 2014 Without a gauge you don't know if the pressure _really_ is higher or if the swelling of the pipes is due to the hot oil having reacted with the rubber and caused it to soften. The other possibility is a stuck oil-pressure relief valve in the pump. Quote Link to comment Share on other sites More sharing options...
will4x4 Posted January 9, 2014 Author Share Posted January 9, 2014 It's definitely higher as I replaced hoses . a pressure relief valve holds pressure with a spring so if all fails it should lose pressure not build right? Quote Link to comment Share on other sites More sharing options...
will4x4 Posted January 9, 2014 Author Share Posted January 9, 2014 http://www.ebay.co.uk/itm/Landrover-oil-cooler-defender-110-v8-/321290927786?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item4ace6e7eaa#ht_82wt_1255 would this fit the ends of my 300tdi oil cooler pipes? my rad is in the back now see. Quote Link to comment Share on other sites More sharing options...
mmgemini Posted January 9, 2014 Share Posted January 9, 2014 Why are you not using the original fit oil to water cooler fitted to the tank in the radiator ? Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 9, 2014 Share Posted January 9, 2014 It's definitely higher as I replaced hoses . a pressure relief valve holds pressure with a spring so if all fails it should lose pressure not build right? It can stick open, closed, or anywhere in between - very few things are good enough to only have one entirely predictable failure mode. Quote Link to comment Share on other sites More sharing options...
will4x4 Posted January 9, 2014 Author Share Posted January 9, 2014 ok ill change pressure release valve. thanks. Rad is in the back now. why can you cut the oil cooler out of it? Quote Link to comment Share on other sites More sharing options...
Gazzar Posted January 9, 2014 Share Posted January 9, 2014 Does the filter housing have the same arrangement as the tdi200? as I recall there's a valve in there. G Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 9, 2014 Share Posted January 9, 2014 Could be anything "upstream" of the cooler really, I'm no TDi anorak, could be a bent or damaged shatner's bassoon for all I know. Quote Link to comment Share on other sites More sharing options...
western Posted January 9, 2014 Share Posted January 9, 2014 Does the filter housing have the same arrangement as the tdi200? as I recall there's a valve in there. G 300tdi oil pump & relief valve are part of the timing case. http://lrcat.com/31/4/53183 oil thermostat part of oil filter head http://lrcat.com/31/4/53190 Quote Link to comment Share on other sites More sharing options...
Ex Member Posted January 9, 2014 Share Posted January 9, 2014 Yes, there should be a thermostat controlling the flow where the feed pipe connects. I would assume there is something blocked in the return side. I would pull and overhaul the adapter housing. Quote Link to comment Share on other sites More sharing options...
mmgemini Posted January 9, 2014 Share Posted January 9, 2014 Putting my thinking cap back on. Have you tried removing the pipes to see what and which way the oil flows ? You said it was blowing the pipes off at the cooler. Are the pipes crimped or hose clip fitted ? I always use two clips to each pipe there. If you check the oil flow. Then you can work through each pipe flow in turn to see if there's a blockage. You did use a NEW cooler ? Never use a cooler from a blown engine as you can not clean all the bits out. Quote Link to comment Share on other sites More sharing options...
smallfry Posted January 9, 2014 Share Posted January 9, 2014 Relief valve jammed shut surely............. OR, is iit at all possible to reverse the connections and the pressure CLOSE the valve instead of opening it ? Or the connections to an oilstat...............if fitted ? Quote Link to comment Share on other sites More sharing options...
Ex Member Posted January 9, 2014 Share Posted January 9, 2014 No, there is no way to put it together backwards. The oil pump is built around the nose of the crankshaft with the PSV off the bottom of the timing case. I'm not sure how the 300TDI is all arranged, but normally...the oil from the pump then goes to the filter housing and through the filter and the cooler (or bypasses the cooler if the t.stat is closed) then into the engine. The normal pressure is set by the flow rate and the restrictions in the engine with the maximum set by the PSV. The PSV would normal only come into effect at low temperature or high engine speeds. You need a pressure gauge on there to see what is happening. The book says 25 to 55 psi. Quote Link to comment Share on other sites More sharing options...
Tetsu0san Posted January 9, 2014 Share Posted January 9, 2014 Do you think that maybe exhaust gasses could be leaking into the sump? Is your engine breathing at all? If you remove the oil filler cap when the engine is running is there any pressure under there? It's just a thought. Quote Link to comment Share on other sites More sharing options...
will4x4 Posted January 10, 2014 Author Share Posted January 10, 2014 Thanks Guys and thanks Tetsu0san, I will check all of the above and report back either way Quote Link to comment Share on other sites More sharing options...
Mutz Posted January 10, 2014 Share Posted January 10, 2014 Mine runs high when cold but when temp is reached drops back to 30psi (ish) That's on a 300tdi. Quote Link to comment Share on other sites More sharing options...
Tetsu0san Posted January 10, 2014 Share Posted January 10, 2014 Mine runs high when cold but when temp is reached drops back to 30psi (ish) That's on a 300tdi. That sounds normal as oil is thicker when cold so the pressure will be higher. Quote Link to comment Share on other sites More sharing options...
will4x4 Posted January 10, 2014 Author Share Posted January 10, 2014 Anyone got an oil pressure gauge in Farnham / Surrey and fancy looking tomorrow morning 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.