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Old 04-20-2018, 09:58 PM   #1
Commander Keen
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Default Keen's Engine-Out Thread (FB20)

This thread is an ongoing log of my current engine-out project. Pictures of the engine removal process will go in a separate thread.

The story so far: My 2012 manual Impreza trashed its throwout bearing after 111K original miles.



Wear marks on the clutch fingers from the spun bearing:


Inside of the throttle body. AC Delco filters seem to be doing a good job:


Here you can see what terrible things Mobil1 does to Subaru engines:

The engine was run on either Mobil1 0W20 Advanced Fuel Economy or Extended Performance with Purolator PL14459 filters changed every 5K miles. It's also equipped with an Amsoil EaBP90 bypass filter.

The engine was well maintained but also driven hard and redlined daily. After 111K miles, there's zero sludge, buildup or even varnish. No additives, flushes or detergents were ever used in the oil.

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Last edited by Commander Keen; 04-21-2018 at 02:24 AM.
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Old 04-21-2018, 02:28 AM   #2
Commander Keen
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Timing cover removal:
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Old 04-21-2018, 06:52 AM   #3
flyboy1100
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Old 04-21-2018, 08:53 AM   #4
GuyLR
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Great pictures and a well cared for engine.
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Old 04-21-2018, 11:53 PM   #6
Commander Keen
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Pulled sump, water pump, thermostat.



Degreasing with Harbor Freight engine washer:



Intake manifold removed, tumble generator valves up close:



Further cleanup with brake cleaner:

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Old 04-22-2018, 01:14 AM   #7
subypete
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Great work Keen! Thanks for sharing.
Found this video amusing, thought I'd share. Though I don't think you are replacing your shortblock.

SUBARU FB20 SHORT BLOCK REPLACEMENT TIME LAPSE
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Old 04-22-2018, 07:45 PM   #8
flyboy1100
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timing chain/gears look pretty good. are you really going to change them? seems a bit unnecessary and defeats the purpose of a chain.
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Old 04-22-2018, 08:06 PM   #9
Commander Keen
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They do look good. Teeth are symmetrical as far as my eyes can tell, so I'm going to leave them alone.

I think head gaskets will give me problems before the chains do.
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Old 04-22-2018, 08:18 PM   #10
flyboy1100
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Hopefully neither do
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Old 04-22-2018, 09:15 PM   #11
Commander Keen
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Quote:
Found this video amusing, thought I'd share. Though I don't think you are replacing your shortblock.
Right, I'm not pulling the heads or splitting the block. Nice video.

Also, I ordered a timing cover gasket, but there's nothing on my timing cover but grey gasket maker. Did Subaru switch at some point?
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Old 04-22-2018, 09:43 PM   #12
flyboy1100
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Quote:
Originally Posted by Commander Keen View Post
Right, I'm not pulling the heads or splitting the block. Nice video.

Also, I ordered a timing cover gasket, but there's nothing on my timing cover but grey gasket maker. Did Subaru switch at some point?
i would use Yamabond 4 or whatever Threebond product subaru uses
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Old 04-22-2018, 10:11 PM   #13
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I got a tube of Permatex Ultra Grey. It's supposed to be equivalent to Threebond and it held fine when I did a valve cover at 30K.
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Old 04-22-2018, 10:50 PM   #14
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Quote:
Originally Posted by Commander Keen View Post
I got a tube of Permatex Ultra Grey. It's supposed to be equivalent to Threebond and it held fine when I did a valve cover at 30K.
i rebuilt a transfer case with Yamabond 4 a few years ago, it is some awesome stuff. technically just a semi-permanent anaerobic sealer. if i have anything in the future that is a machined to machined metal surface to seal i will be using Yamabond i think.
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Old 04-23-2018, 10:12 AM   #15
DieselDorf
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Seems unnecessary to do the water pump and hoses, are the hoses getting flimsy already?
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Old 04-23-2018, 11:55 AM   #16
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Nice work Keen!

Nice to see that Mobil one is working well for you as I will be changing to this oil on my next service. I was running Castrol the entire time I have had this car and they just put the Mobil One Advanced Fuel Economy for half price at my local auto store so I stocked up.

Also seeing that degreased engine has me jealous, I am going to have to give mine a real good cleaning.
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Old 04-23-2018, 01:48 PM   #17
Commander Keen
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Nothing went wrong with the engine so all of those parts are preventive replacements.

It's cheap insurance against lost time, coolant and a tow.
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Old 04-23-2018, 09:16 PM   #18
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I like to test for oil pressure before reinstalling an engine by cranking with the plugs removed, but the FB20 mounts the starter through the transmission, so a 50mm spacer is needed.

I designed this in Blender (a free 3D modeling program for all major OSes):



Last edited by Commander Keen; 04-24-2018 at 12:17 PM.
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Old 04-24-2018, 10:01 PM   #19
Commander Keen
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Cam clearances look good.



Spec for intake is 0.10-0.16 mm. Measured:

.127-.152
.127-.152
~.152
.127-.152
~.127
.127-.152
.127-.152
.127-.152

Spec for exhaust is .21-.27mm. Measured:

.203-.254
~.254
.203-.254
.203-.254
.203-.254
.254-.267
.203-.254
.203-.254

Last edited by Commander Keen; 04-26-2018 at 01:12 AM.
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Old 04-24-2018, 10:35 PM   #20
flyboy1100
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so much more detailed that expected for throwout bearing replacement

clutch set here yet?
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Old 04-24-2018, 10:52 PM   #21
Commander Keen
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Quote:
so much more detailed that expected for throwout bearing replacement

clutch set here yet?
Right, well it's nice to know the top end is within spec.

I've been planning this work for a while. The throwout bearing gave me a reason to do it.

Amazon says Thursday on the clutch kit.

Last edited by Commander Keen; 04-25-2018 at 09:51 AM.
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Old 04-25-2018, 12:09 PM   #22
flyboy1100
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i hope it fits! lighter flywheel w/ bigger clutch should make pretty much no difference you think? or think might need higher rpm anyway for takeoffs?
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Old 04-25-2018, 12:28 PM   #23
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Cutting nearly half the flywheel weight should be very noticeable. Also matters where the weight is. The BRZ flywheel has holes along the perimeter where the weight reduction is most effective.

Launches will probably need more attention but from what I've read, it's not too bad.
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Old 04-25-2018, 02:07 PM   #24
Angelus911
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I'm somewhat jealous - I wish I knew 1/100 of what you know regarding cars.

Hopefully everything fits together fine and there aren't any major issues!
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Old 04-25-2018, 06:45 PM   #25
flyboy1100
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Quote:
Originally Posted by Angelus911 View Post
I'm somewhat jealous - I wish I knew 1/100 of what you know regarding cars.

Hopefully everything fits together fine and there aren't any major issues!


Just takes tools, time, and a place to work
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