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05-01-2020, 11:05 PM | #1 |
Scooby Newbie
Member#: 483823
Join Date: Mar 2018
Location: Stone Ridge, NY 12484
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2006 forester 2.5 non Turbo 5 speed
I posted about what appears to be excess oil consumption. Several quarts between changes. 176,000. Great shape otherwise.
Looking to get an idea of the best path forward should major work be required. Simple head gasket, valve job w/seals, pistons and ring, or more, up to a complete reqbuild or short block? Just looking for paths forward. Is this a feasible rebuild for a competent back yard mechanic, or are there secret pitfalls for those new to Subaru engines?
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05-07-2020, 12:12 PM | #2 | |
Scooby Specialist
Member#: 283429
Join Date: May 2011
Chapter/Region:
South East
Location: Down yonder.
Vehicle:2016 Fuji Sunfire 03 Silver |
Quote:
If you have not diagnosed the cause then no, I would say you should not attempt the repair. The first step is proper diagnosis. I say this only because an N/A EJ25 in great shape, even at that mileage, usually does not require that level of repair unless neglected or repeatedly overheated. |
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05-07-2020, 12:38 PM | #3 | |
Scooby Newbie
Member#: 483823
Join Date: Mar 2018
Location: Stone Ridge, NY 12484
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Quote:
I have only done a visual inspection of the underside and that was a while ago. Do plan to change out the PCV valve when I can get access to the vehicle for a day. The other tests I will have to look into doing as I am not familiar with doing them on a Subaru. Probably not too different, but not being a day to day mechanic, some research is called for. I do have the tools, but not the experience with this configuration. |
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05-07-2020, 01:38 PM | #4 | |
Scooby Newbie
Member#: 483823
Join Date: Mar 2018
Location: Stone Ridge, NY 12484
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Quote:
Perhaps you can give me some pointers? |
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05-10-2020, 12:59 PM | #5 | |
Scooby Specialist
Member#: 283429
Join Date: May 2011
Chapter/Region:
South East
Location: Down yonder.
Vehicle:2016 Fuji Sunfire 03 Silver |
Quote:
Here's a quick chart to get you started: |
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05-10-2020, 01:24 PM | #6 | |
Scooby Newbie
Member#: 483823
Join Date: Mar 2018
Location: Stone Ridge, NY 12484
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Quote:
Anyway, soon as I can, I will figure out where my vacuum gage is, or buy a new one, and give this a go. |
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07-14-2020, 03:31 PM | #7 |
Scooby Newbie
Member#: 516711
Join Date: Jul 2020
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NO severe leaks on the outside? It's burning the oil?
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07-18-2020, 11:34 AM | #8 |
Scooby Newbie
Member#: 348982
Join Date: Mar 2013
Chapter/Region:
NESIC
Location: Shoreham, VT
Vehicle:2002 TS Multi |
I think what Bass is trying to get at is over time the intake valves will have build up on them from carbon and other deposits the PVC drops back in our intake to be re-burned. When the valves are no longer sealing right due to the carbon build up or the guilds are worn out, it allows oil to leak by into the combustion chamber. A vac test will confirm the valves are in proper working order and are sealing right for if they are not your problem could be with your heads and not the piston rings.
Intake valves are normally the problem as most engines do not get hot enough to burn off the carbon build up on them. exhaust valves how ever can see acquitted temperatures to burn off the carbon deposits if run for long enough. One other thing you can do is if you have a bore snake with a camera, remove spark plugs and look into the cylinder and look for oil sitting on top of the piston. I picked up one cheap at lowes for like $80 bucks back in the day. Hope this helps |
07-18-2020, 12:43 PM | #9 | |
Scooby Newbie
Member#: 483823
Join Date: Mar 2018
Location: Stone Ridge, NY 12484
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Quote:
I do not have a usable vacuum gauge at the moment, but can get one. Just realized I have no idea where to hook it up for the test, but can probably find that somewhere. I do have a couple of those el-cheapo "bore scope" snakes that plug into phone or tablet via USB. I can give that a try as well. |
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07-18-2020, 06:18 PM | #10 |
Scooby Newbie
Member#: 348982
Join Date: Mar 2013
Chapter/Region:
NESIC
Location: Shoreham, VT
Vehicle:2002 TS Multi |
Your welcome, The vacuum system on the subaru is very basic for our non turbo engines. It runs under the intake manifold along the bottom down by the fuel injectors, should be a valve with a wire going to it on the pass side behind the PS pump, then they continue to the drivers side again down by fuel injectors and the very bottom small line with fuel lines. The break booster obviously connects to the intake manifold ect ect same with PCV valve from motor. Only 2 hoses that will not give you any readings are the valve cover ones venting to the intake box.
You El- Cheapo bore scope, thank you for the word, I was hung over this morning, will work, I use it mostly on small engine repairs but it has come in handy for the older EJ251's and earlier DOHC 2.5's with known head gasket issues. Hope you find your answer |
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