blown99 Posted November 8, 2008 Share Posted November 8, 2008 I've got an 03 vt 365 with a no start due to low icp while cranking. Makes 250-400 psi. I pressure test the system through the plug in the rear of the HPOP cover, energize the IPR valve and I have a big leak. Remove the intake and the pump cover. Remove the stc type joint and find the ring inside broken. R&R the pipe from the pump to the branch tube. At this point we have nothing to pressurize the system with the cover off, so I reinstall the cover, pressure test and I still have a leak (with the ipr energized) Boss says to reassemble because I found the broken part, guess what, still a no start. Tear it apart. This time a made a fitting to pressure test the branch tube on out the rails. Zereo leaks. (I did have the valve covers off before and inspected for leaks by cranking the engine with the IPR valve energized. No Leaks were found then) I then shot air into the port on the stc tube that feeds the ipr valve (cover still off) and had air blowing out the hpop seal. I though great, here is the leak, ordered a pump, should be here on Monday. Then I look on this board and see a posting from a few weeks ago about dead heading the 03 pumps and tsb's saying that leakage around the pump seal is normal. So how much is normal. This was a large enough leak to (with the hpop cover on) blow oil out of the turbo oil feed line. With the hpop cover off, it would shoot oil onto the firewall. This is the first 03 series engine I have seen with a high pressure oil system issue so my experience is a big fat 0. Ideas?? Quote Link to comment Share on other sites More sharing options...
GregH Posted November 8, 2008 Share Posted November 8, 2008 Try removing the IPR and look for debris on the screen... Some leakage from the front of the pump is normal... But it shouldn't be much. But there should be very little to no leakage back into the resevoir. Once oil has entered the high pressure system, it should not be allowed to go backwards through the pump again. It seems to me that when you put air to the system, and oil came out of the turbo feed pipe, that air is blowing oil backwards through the pump and up to the oil cooler area... That isn't right at all... I'd say based on that, you need a pump. But debris on the IPR screen would reinforce that belief.... Quote Link to comment Share on other sites More sharing options...
blown99 Posted November 8, 2008 Author Share Posted November 8, 2008 There was a very tiny amount of debris on the IPR valve screen. Not enough to block off oil flow or cause a screen to be sucked in. Looked more like the debris you find on the oil resivoir screen vs metal shavings indicating the failure of a hpop. Quote Link to comment Share on other sites More sharing options...
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