subestyle18 Posted August 28, 2007 Share Posted August 28, 2007 I had an exhaust leak between the block and y pipe. I put in new gaskets (napa brand) and torqued the bolts down. The leak was pretty much gone, you could hear it a little bit. A couple days of driving the leak was back. I retightend the bolts, only 2 were some what loose. Then i moved to Bozeman Montana (MSU) so i've put 800miles on it and the leak continued to get worse, and now is louder then it was orginaly. I've check the bolts and they are tight. I'm about to pull them off and goop some high temp RTV sillicon in there to see if that helps. Any suggestions on a better method would be great. All so i have devoped a nice oil leak on the drive over, seems to leak only when running, and expecialy when im running hard (ie freeways are 75mph here at 5000ft elev.) How much does a reseal on a engine cost normaly. Thanks David Link to comment Share on other sites More sharing options...
Rooster2 Posted August 28, 2007 Share Posted August 28, 2007 I don't think adding some hi temp silicon sealant is going to help. The extreme heat plus the pressure of the exhaust gas will blow the sealant. Suggest that you install a new gasket, and make sure that all remnants of the old gasket are removed, that may have made for a poor seal when you installed the first seal. Attempt to torque the bolts down as evenly tight as possible, so one side is not pulled down tighter then the other side. Use a torque wrench if possible to do this. As far as the oil leak goes, go to an auto parts store and buy an oil additive that helps to swell up existing seals. Once added, it will take some time to work, but it should help slow down your oil leakage, but prolly won't stop the leak entirely. Since your car is a '93, it doesn't make sense to do a major expensive motor tear down just to replace a leaky seal. Also on high milage cars (over 100,000) miles my mechanic recommended using 20w50 weight oil in the summer time, then using 10w40 weight in the winter to improve oil pressure. Using a heavier weight oil also slows down an oil leak. I have been doing that with my two Subies for years with good results. Link to comment Share on other sites More sharing options...
subestyle18 Posted August 29, 2007 Author Share Posted August 29, 2007 The copper rtv is rated for exhaust temps, some of the boats i used to work on just used the rtv and no gasket so i know it handle it. I had scraped both faces smooth with a razer before installing the gasket, and torqued all the bolts evenly. I'm going to pull it a part again and see if maybe one of the gaskets were defective in some way. As for the oil, yeah i probaly need a higher weight, i cheaped out on the quality last change to since i was low on money. In an old engine i used to run 25w50 hd oil and it didnt leak much but is a lot more expencive. Thanks for the adivice Link to comment Share on other sites More sharing options...
subestyle18 Posted September 1, 2007 Author Share Posted September 1, 2007 I pulled the y pipe off to put a new set of gaskets in, and found that one of the 2 to 1 elbows that is pressed fit to the end of the y pipe had come completly detached. A little jb weld and some exhaust repair wrap and it looks like it is sealed up. If not i'll have to find a junkyard and get a new one. dave Link to comment Share on other sites More sharing options...
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