YW Sin Posted May 12, 2003 Share Posted May 12, 2003 Now this is new and no body could find the cause yet My 1.7 X-flow oil pressure drops to 1 bar from 2 when revved. Lower end of the engine has been opened up and all the bearings are found normal. I have installed high capacity oil pump from RK but same result. ( just better pressure when at idle ) Have been calling around but no body has any clue. Anybody has any idea? A ll standard, Classic 1.7 X-flow Edited by - yw sin on 12 May 2003 14:30:19 Link to comment Share on other sites More sharing options...
julians Posted May 12, 2003 Share Posted May 12, 2003 I had a similar thign with my zetec, oil pressure would drop from 4 to 3 bar at anything over 4500 rpm, turned out to be an air leak in the oil pick up pipe in the sump. Link to comment Share on other sites More sharing options...
YW Sin Posted May 12, 2003 Author Share Posted May 12, 2003 This was my guess too but the oil pressure on mine drops immediately as soon as the rev starts! ☹️ I will ask the man at the garage to double check the pick-up pipe anyway. Link to comment Share on other sites More sharing options...
Robert Lane Posted May 12, 2003 Share Posted May 12, 2003 What type of pressure gauge ? Electric or capillary? Has the engine been checked on another gauge? Link to comment Share on other sites More sharing options...
YW Sin Posted May 12, 2003 Author Share Posted May 12, 2003 We did check with two different types of mechanical guages and results were the same! Link to comment Share on other sites More sharing options...
Bare Posted May 12, 2003 Share Posted May 12, 2003 Often Oil pressure Relief valves behave badly. Perhaps you should pull it out and replace the Piston with a comparable sized Ball bearing (more Reliable).. also replace the spring if Possible. Not much else to try. Link to comment Share on other sites More sharing options...
I.Mupferit Posted May 12, 2003 Share Posted May 12, 2003 The oil pressure relief valve is fitted to the pump on the X/Flow so the new pump would have sorted that but I would very strongly suspect the pick up pipe could be allowing air to leak in somewhere above the oil level. Once the oil is in the pump it is under pressure from there rather than suction so I can't envisage any other scenario that would cause the pressure to drop when the engine is revved. My first thoughts when I read your post was 'faulty gauge or sender' but you seem to have eliminated that so it definitely sounds to me like a pick up pipe problem. Brent Bloody thing won't start ☹️ Link to comment Share on other sites More sharing options...
YW Sin Posted May 12, 2003 Author Share Posted May 12, 2003 I will call the garage man (Mr. Claude Rucheton of Ruphil garage-boid colombes. He was an ex-chamion of lotus seven race France years back I think) to double check the pick up pipe tomorrow. He is also very curious to find out what is causing all this 😬 Link to comment Share on other sites More sharing options...
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