.:Bullen:. Posted January 1, 2015 Share Posted January 1, 2015 Hi Guys Just looking for a bit of advice ive been building a twin turbo kit out of a Jim Wolf kit I purchased and as the manifolds where no good I had some low mount tubular manifolds made. All pipework etc is all complete they are a ball bearing gt25 turbos and are oil and water cooled. Anyways I have plumbed it all in using the oil restrictor from the Jim Wolf kit i believe its a 0.050" restrictor to bring the oil pressure down. Im using a EXA-Turbowerx scavenge pump to sypthon the oil back to the sump. However the turbos are leaking oil out of both sides into the exhaust & cold side housings. When i first set it up the pump was wired backwards from the factory and so oil was being pumped in from feed & drain only for about 30secs-1minute before I noticed the fault. Now could this have damaged the seals & thats why its leaking ? Or perhaps wishful thinking could it be the oil left over from this now being pushed out? My question is really can I tell if the seals are damaged ? Or perhaps a good way of cleaning the turbos if i remove them and clean excess oil out and re try. Or if anyone has any other input ideas that would be great. hanks in advance Quote Link to comment Share on other sites More sharing options...
Ekona Posted January 1, 2015 Share Posted January 1, 2015 Sounds very much like the seals are gone, if it's leaking both sides. Quote Link to comment Share on other sites More sharing options...
Greg Warnes Posted January 1, 2015 Share Posted January 1, 2015 Some good info here: http://www.turbobyga...ett/oil_leakage Troubleshooting Guide attached. May be worth speaking direct with Garrett Garrett_Troubleshooting_Guide.pdf Quote Link to comment Share on other sites More sharing options...
.:Bullen:. Posted January 1, 2015 Author Share Posted January 1, 2015 I did imagine it was the seals but i was hoping that if I cleaned them both it could of been the excess oil but I guess I will have to send them off for inspection/rebuild. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Greg Warnes Posted January 1, 2015 Share Posted January 1, 2015 Was the engine/turbo's running when the pump was wired up incorrectly? The bearing seal relies on the air pressure through the turbo to stop the oil leaking through the seal, hence why turbos are sometimes a little smoky at low engine rpm (lower pressure through turbo) Quote Link to comment Share on other sites More sharing options...
.:Bullen:. Posted January 1, 2015 Author Share Posted January 1, 2015 Yes the pump was wired incorrectly from the factory I should of checked rotation but presumed it would be correct. But I started the engine and then got out of the car peered underneath & noticed the oil coming out the exhaust flexi. So switched it off straight away hoping to avoid damage Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted January 1, 2015 Share Posted January 1, 2015 (edited) Would there have been excessive pressure generated by the pump running in reverse? turbo seals are pretty strong, they are like a mini piston ring and take considerable pressure to cause failure, a BB turbo uses the same type of seal that a plain bearing turbo , and oil pressures can reach well in excess of 120psi when oil is cold, so I would doubt this is the problem. I would suspect that its just the leftover oil from the pump forcing oil past the seals because it was restricted on the feed side, give it a good few miles to clear, if it doesn't after that then further exploration will be needed. Turbo seals do not depend on air pressure to seal properly, or all turbo engines would smoke during N/A operation. PS. where the turbos new? Edited January 1, 2015 by Tricky-Ricky Quote Link to comment Share on other sites More sharing options...
.:Bullen:. Posted January 1, 2015 Author Share Posted January 1, 2015 No the turbos where not new however had only covered around 5k miles. Oil pressure on startup is 50psi on cold start with the restrictor fitted it brings it down to around 15psi I believe and then the pump pressurising the bottom would be about 30psi I would imagine. So we'll under the 120psi. I have removed the turbos from the car now and tipped any excess oil out any recommendations on how to clean it properly I figured brake cleaner would be ok ? Shouldn't damage any seals ? Also I thought there was a rubber type seal to keep the oil in? At least there is in the rebuild kits they sell for journal turbos Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted January 1, 2015 Share Posted January 1, 2015 Not enough pressure to cause any damage, it feasible that there is past seal damage but time will tell, as I said it probably down to the back pressure, and the fact that the shaft was not turning. No turbo seals are always metal, the rubber O rings in the kit are for the cold side housing to core, brake cleaner will be fine and wont cause a problem. Quote Link to comment Share on other sites More sharing options...
andybp Posted January 1, 2015 Share Posted January 1, 2015 cant see that sort of pressure causing damage, unless they are already worn i reckon cleaning out the oil you forced past the seals should do the trick Quote Link to comment Share on other sites More sharing options...
.:Bullen:. Posted January 1, 2015 Author Share Posted January 1, 2015 Is there any way to check the seals while they are off ? Also just spraying brake fluid down the ports ok ? Or best to remove the snail & exhaust housings ? Appreciate all the help guys Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted January 1, 2015 Share Posted January 1, 2015 No way to check the seals without dismantling fully, if the turbos are off then just spray cleaner down both cold and hot side, if they are still on the car then just start and run/drive for a while, the oil will just burn off with exhaust heat, if its still smoking after 20 odd miles then you have a problem with the seals. Quote Link to comment Share on other sites More sharing options...
.:Bullen:. Posted January 1, 2015 Author Share Posted January 1, 2015 Awesome there off the car so il just thoroughly clean them & hope & pray they are fine ha thanks guys Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
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