darsdoug Posted October 24, 2018 Share Posted October 24, 2018 At a glance it appeared my non-turbo SOHC 2.5 had been leaking antifreeze from the water pump. I installed a new pump but I still have the leak coming from somewhere above the pump. Could it possibly be the notorious external HG coolant leak that 04 Subaru 2.5L are known for? What is the fastest way to pinpoint the origin of the leak without pulling the intake off? ughh. Quote Link to comment Share on other sites More sharing options...
lmdew Posted October 24, 2018 Share Posted October 24, 2018 Clean the engine, you can then use baby powder and see the coolant trail. Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted October 24, 2018 Share Posted October 24, 2018 04's do not leak coolant from the HG's. 1 Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted October 24, 2018 Share Posted October 24, 2018 (edited) crossover? you can get a rig to pressurize the system while you look for the leak Edited October 25, 2018 by 1 Lucky Texan Quote Link to comment Share on other sites More sharing options...
darsdoug Posted October 24, 2018 Author Share Posted October 24, 2018 (edited) 9 hours ago, GeneralDisorder said: 04's do not leak coolant from the HG's. ah er o.k. Always thought all of them from 2000 up to about 2008 had that issue? I guess that's what I get for thinking? The last time I was thinking I put a heli coil in a tensioner bracket. quack. Edited October 24, 2018 by darsdoug Quote Link to comment Share on other sites More sharing options...
darsdoug Posted October 24, 2018 Author Share Posted October 24, 2018 13 hours ago, lmdew said: Clean the engine, you can then use baby powder and see the coolant trail. I shall try that. Thanks Imdew. Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted October 25, 2018 Share Posted October 25, 2018 99 to 02 leak coolant and oil, 03 to 10 leak only oil. Design change on the gasket. GD Quote Link to comment Share on other sites More sharing options...
3Pin Posted October 25, 2018 Share Posted October 25, 2018 GD, if you replace the HG with the new design on a 09-02, are they leak only oil after that? Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted October 25, 2018 Share Posted October 25, 2018 1 hour ago, 3Pin said: GD, if you replace the HG with the new design on a 09-02, are they leak only oil after that? I suppose - but we use the 642 or 770 turbo 2.5 gasket that doesn't leak either. GD Quote Link to comment Share on other sites More sharing options...
3Pin Posted October 26, 2018 Share Posted October 26, 2018 10-4. Thanks Quote Link to comment Share on other sites More sharing options...
lmdew Posted October 26, 2018 Share Posted October 26, 2018 GD do you still have good results surfacing the heads on a sheet of glass with Abrasive Cloth? Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted October 26, 2018 Share Posted October 26, 2018 Yes that's how we do it. 1/2" glass and this is the cloth we use. https://www.amazon.com/INDUSTRIES-4245-Emery-9-Inch-11-Inch/dp/B000BPNMZ4 We do a 2 step process - we rough both heads down with the new sheet, then we go back over both a second time with the "used" sheet. The grit of the cloth shears down and becomes finer leaving a smoother surface. I check the flatness with a granite surface plate, a machinists straight edge, and then the surface finish with an Ra meter. Ultimately my surface finish is comparable to what my cylinder head shop produces with their CBN flycutter. It's faster for us as there is no wait time for the machine shop and no drop-of/delivery. It's easier to just do it ourselves. GD 1 Quote Link to comment Share on other sites More sharing options...
lmdew Posted October 27, 2018 Share Posted October 27, 2018 A good upper body work out for the day, with no gym fee. 1 Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted October 27, 2018 Share Posted October 27, 2018 It's especially fun when the shop gets up to about 100 degrees. Quote Link to comment Share on other sites More sharing options...
whynot Posted October 30, 2018 Share Posted October 30, 2018 so are you saying that I can use a 642 or 670 on a 99 outback with a 2.5L? Quote Link to comment Share on other sites More sharing options...
Mike104 Posted October 30, 2018 Share Posted October 30, 2018 (edited) 11044AA642 and 770 are the preferred MLS Turbo gasket for SOHC EJ25 engines Edited October 31, 2018 by Mike104 Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted October 30, 2018 Share Posted October 30, 2018 22 minutes ago, whynot said: so are you saying that I can use a 642 or 670 on a 99 outback with a 2.5L? I did not say that. The 642 and 770 gaskets can be used on the SOHC EJ engines from 99 to 2012. They cannot be directly used on the 96 to 99 DOHC engines without changing the pistons. If you use 99 to 05 pistons you can then use the 642 or 770. Otherwise you absolutely cannot use them as the DOHC pistons will hit the chamber. GD Quote Link to comment Share on other sites More sharing options...
whynot Posted October 30, 2018 Share Posted October 30, 2018 great I was a little confused, so I asked. Thanks Quote Link to comment Share on other sites More sharing options...
darsdoug Posted November 18, 2018 Author Share Posted November 18, 2018 It was just the thermostat seal leaking a little. A new one solved that mystery. quack quack quack. 2 Quote Link to comment Share on other sites More sharing options...
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