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04-28-2021, 01:24 PM | #1 |
Scooby Newbie
Member#: 517340
Join Date: Aug 2020
Location: Philadelphia
Vehicle:2007 WRX STI |
07 STI Cleaning AVCS Gears and Solenoids
After thorough research I came to the conclusion that the AVCS gears can not be properly and safely reassembled without a specific Subaru tool. Outfront motorsports made their own thing that works very well and will clean and reassemble each gear for $50. My motor had metal shavings in oil from being run very low on oil for presumably quite awhile, so I am doing a full rebuild. There really isn't a lot of metal flaking compared to other bearing failures I have seen. These are my questions.
1. Should I just say **** it and soak my AVCS gears in gasoline and let that clean them out? I can't imagine there is a ton of metal in there and whatever could be left over might just get picked up in the filter. Don't feel like spending over 300 dollars on new ones. Considering sending them out to Outfront but it would probably take awhile to get them out and back and I'm trying to get the motor together. 2. Is it possible to clean the AVCS solenoids? The car has 140k or so miles on it anyway so they might be running out of life as it is but they're 160+ bills to replace. Not necessarily pinching pennies here but am trying to save money where I can if I feel something is unnecessary.
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04-28-2021, 03:03 PM | #2 | |
Scooby Specialist
Member#: 193940
Join Date: Nov 2008
Location: Philly
Vehicle:2004 WRX STI Black RalliSpec Shortblock |
Yes AVCS solenoids can be cleaned with brake cleaner. I ordered 2 brand new ones and after cleaning my old solenoids i just sold the new ones. Use brake cleaner and spray in all the groves and use a plastic or rubber poker to move the solenoid as you spray. Should do the trick.
Quote:
https://www.outfrontmotorsports.com/...gear-servicing Here is a Nasioc HOW TO step by step https://forums.nasioc.com/forums/sho....php?t=2441411 Last edited by BlackFighter; 04-28-2021 at 03:43 PM. |
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04-28-2021, 04:06 PM | #3 |
Scooby Specialist
Member#: 34361
Join Date: Mar 2003
Chapter/Region:
MWSOC
Location: MI
Vehicle:04.7 STI WRB IG @got2boostit2 |
Hey Rookie,
You cannot adequately clean the AVCS cam gears without complete disassembly. The exhaust gears require synching when rebuilding and the tool OutFront made is needed. Buy new at $300 a set versus $3000 plus because metal shavings lodged in the gears led to bearing failure. |
04-29-2021, 11:26 AM | #4 | |
Scooby Newbie
Member#: 517340
Join Date: Aug 2020
Location: Philadelphia
Vehicle:2007 WRX STI |
Quote:
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04-29-2021, 12:16 PM | #5 | |
Scooby Newbie
Member#: 517340
Join Date: Aug 2020
Location: Philadelphia
Vehicle:2007 WRX STI |
Quote:
The issue doing it yourself being that if there is any misalignment during reassembly the gear can bind and eventually break and then I am rebuilding the motor again. My point was if I could avoid taking them apart at all I would, but I am not willing to risk disassembling and reassembling them incorrectly and starting from square one again. |
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04-29-2021, 01:40 PM | #6 |
Scooby Specialist
Member#: 193940
Join Date: Nov 2008
Location: Philly
Vehicle:2004 WRX STI Black RalliSpec Shortblock |
Ship them to outfront for cleaning or buy new from the dealer. The way I look at thing, if someone can do it, why can't I do it, so I would go for it, its not to difficult, Just take your time and double check your work.
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04-30-2021, 08:44 PM | #7 |
Scooby Specialist
Member#: 34361
Join Date: Mar 2003
Chapter/Region:
MWSOC
Location: MI
Vehicle:04.7 STI WRB IG @got2boostit2 |
Jay,
I took a couple apart and tried cleaning them in the ultrasonic tank. I really didn't like the look of the plastic wipers in both of the AVCS gears so I bought new. |
05-01-2021, 12:57 AM | #8 |
Scooby Newbie
Member#: 518830
Join Date: Sep 2020
Chapter/Region:
RMIC
Location: Colorado
Vehicle:2009 WRX dark grey metallic |
You definitely won’t get them clean without taking apart. I had a ton of metal flecks that were stuck in a varnish like substance that took a lot of work to get clean. Don’t risk it!
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05-01-2021, 11:01 PM | #9 | |
Scooby Specialist
Member#: 419354
Join Date: Apr 2015
Chapter/Region:
MAIC
Location: Newark, Delaware
Vehicle:2007 STI Crystal gray metallic |
Quote:
If you still think gasoline will do it, check out the inside of mine from a few years ago: https://youtu.be/3AwDpxrDEec At 140k, replace the AVCS solenoids your engine will thank you with revived low end pick-up. Tired control valves won't kick a CEL, but lagging performance can be seen in data logs. OCVs can be had for ~$90 if you shop around. Heuberger subaru usually has very competitive pricing ($98 ea): https://parts.bestbuysubaru.com/p/Subaru_2007_STI-25L-TURBO-6MT-4WD-SEDAN/Engine-Variable-Valve-Timing-VVT-Solenoid/49223110/10921AA080.html I have an 07 STI as well. Be 100% certain to get the correct control valve part number for your model year & cylinder head (V25). 2007 is a black-sheep year. The number should be 10921AA080. |
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05-02-2021, 10:20 AM | #10 |
Scooby Specialist
Member#: 515308
Join Date: Jun 2020
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Ship em out, buy a set here, or pull them apart, I took mine apart(intake only) you can clean them, put them together using a cam if u must and test it with compressed air.
Mine were ruined by improper installation before me, the alignment pins had jacked up the gear partially closing an oil port on each. I can give u one if U want to practice on it. |
05-03-2021, 12:37 PM | #11 | |
Scooby Newbie
Member#: 517340
Join Date: Aug 2020
Location: Philadelphia
Vehicle:2007 WRX STI |
Quote:
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05-03-2021, 01:24 PM | #12 |
Scooby Newbie
Member#: 518830
Join Date: Sep 2020
Chapter/Region:
RMIC
Location: Colorado
Vehicle:2009 WRX dark grey metallic |
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05-04-2021, 12:49 AM | #13 |
Scooby Newbie
Member#: 480942
Join Date: Jan 2018
Location: Bay Area, CA
Vehicle:2005 Forester XT Maroon |
Mine had the same black crud. Almost a real heavy tar like deposit. No metal but man, maybe an hour per gear with a toothbrush and brake clean to get that tar out.
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06-25-2021, 08:46 PM | #14 |
Scooby Newbie
Member#: 458218
Join Date: Nov 2016
Chapter/Region:
RMIC
Location: Denver, CO
Vehicle:2008 Outback XT White |
+1 for getting them professionally rebuilt- it is not worth the risk. ZF Design in Denver also does rebuilds and sometimes has sets in stock to exchange for cores. If you rattle gunned the cam gears off it would be worth checking the alignment pin receiving holes, which can ovalize from using an impact.
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