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Old 03-18-2006, 01:02 PM   #1
wgknestrick
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Default STI Cam Sprocket/Gear Removal??

I've searched and haven't come up with much on this subject.

1. Gears are brittle, plastic, torqued to 72ft-lbs, and expensive
2. Special Subaru ST tools to remove these are not sold by dealers and sell for $180 and $120 respectively by Kent Tool Co.
3. Many people here have built engines and removed them.
4. STI AVCS cams don't have the uber convienent wrench flat on the cam shaft itself like the non-AVCS cams.
5. Subaru engineers are morons for not designing a simple wrench flat in the cam shafts or at least a better way to remove these. I shouldn't have to buy $300 worth of wrenches to take off $600 worth of parts.

What do we do?

Best idea I have is impact wrench on the nut, while securing the gear with a strap wrench.

The problem with this is clearence between gears and damage to teeth. I don't think I can destroy the timing belt to wrap around a gear (to protect it) AND still get a strap wrench on it. Has anybody made a "strap wrench" out of a timing belt itself to do this?
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Old 03-18-2006, 03:33 PM   #2
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Well there is a flat spot on the cams, i've them many times to remove/install cam gears.
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Old 03-18-2006, 04:47 PM   #3
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Wrap your old timing belt around the crank and one side of the cam gears. Use a vice grip to clamp the belts teeth together at the crank....You now have an inexpensive way to remove your cam gears with out damaging the gears or the cams

Quirt Crawford
www.crawfordperformance.com
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Old 05-11-2009, 11:15 PM   #4
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Quote:
Originally Posted by Crawford Performance View Post
Wrap your old timing belt around the crank and one side of the cam gears. Use a vice grip to clamp the belts teeth together at the crank....You now have an inexpensive way to remove your cam gears with out damaging the gears or the cams

Quirt Crawford
www.crawfordperformance.com


Bad Idea, I just broke the passenger side exhaust (plastic) cam gear doing this.

No substitute for the right tool (unless you are very lucky).


Rafi
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Old 05-12-2009, 10:14 AM   #5
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Don't listen to him.

He's a plant from the Subaru Tool Manufacturer.

Everyone keep using their old timing belts.

Nothing to see here.
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Old 05-12-2009, 10:41 AM   #6
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Quote:
Originally Posted by zombiedog View Post
Don't listen to him.

He's a plant from the Subaru Tool Manufacturer.

Everyone keep using their old timing belts.

Nothing to see here.


Quote:
Originally Posted by RR-racing View Post
Bad Idea, I just broke the passenger side exhaust (plastic) cam gear doing this.

No substitute for the right tool (unless you are very lucky).


Rafi

How on earth did you break the cam gear?!!! I've never seen that happen. Are you sure you were turning the correct direction?
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Old 03-18-2006, 10:54 PM   #7
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Quote:
Originally Posted by sjl1614
Well there is a flat spot on the cams, i've them many times to remove/install cam gears.
WRX cams =/ AVCS cams


Anyways,
Thanks Quirt
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Old 03-18-2006, 10:57 PM   #8
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Is an impact wrench still a "good" idea?
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Old 03-19-2006, 02:57 AM   #9
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Quote:
Originally Posted by wgknestrick
Is an impact wrench still a "good" idea?
It's probably going to have to be a pretty serious impact gun. I think I read someone broke a 3/4" socket. I had great success with like... an 8 foot breaker bar and my heaviest friend hanging on it. Times like that I wish I had the Subaru removal tool.. but Quirt's idea is news to me and I wanna try it next time.
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Old 03-19-2006, 08:53 AM   #10
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The last set of wrx cams had flats on the cams also.....
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Old 03-19-2006, 10:07 AM   #11
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Quote:
Originally Posted by wgknestrick
4. STI AVCS cams don't have the uber convienent wrench flat on the cam shaft itself like the non-AVCS cams.
Quote:
Originally Posted by wgknestrick
WRX cams =/ AVCS cams




Quote:
Originally Posted by sjl1614
The last set of wrx cams had flats on the cams also.....

When did we ever start talking about WRX cam gears in this thread?
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Old 03-19-2006, 10:39 AM   #12
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it takes some serious power to remove gears from the cams...they could not be moved from mine. A place where i had my cams taken off ordered a tool to do it, broke the tool, broke my gear and finally got it off and put a new gear in it. they even tried Infamous' way with a bar and people on it...no luck
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Old 03-19-2006, 01:55 PM   #13
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1000 ft/lb impact gun, 5 minutes and call it a night
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Old 03-19-2006, 08:40 PM   #14
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Quote:
Originally Posted by Peeblesmx445
1000 ft/lb impact gun, 5 minutes and call it a night
900ft/lb gun didn't work for me, i had a 6ft pole with about a 250lb friend of mine hanging on it to have them come free.... it was a mess
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Old 03-19-2006, 09:16 PM   #15
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Quote:
Originally Posted by ejsportcom
900ft/lb gun didn't work for me, i had a 6ft pole with about a 250lb friend of mine hanging on it to have them come free.... it was a mess
worked or me without any problems.
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Old 03-19-2006, 09:25 PM   #16
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Got them off and here is by far the best and most descript way to do it.

Leave all the timing belt guides on the engine.
Dont' remove the timing belt.
Make sure you have the timing belt/engine in proper location as to not damage valves.
Put a breaker bar on the crank bolt to hold the crank/belt cams in place
Use another breaker bar on a HARDENED allen socket (broke a craftsmen in about .2s)

The gear bolts break super easy this way, and you don't ruin your timing belt. We had no problem with it jumping teeth or anything.

Most impact guns can't even touch these bolts, as these bolts just laughed at ours.
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Old 03-20-2006, 04:12 PM   #17
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I tried it that way and it keep jumping teeth. I think I'll try it the way Quirt mentioned, even though I have the tools ordered.
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Old 03-20-2006, 07:55 PM   #18
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I've never removed cam gears from a Suby, but I have taken them off of other motors. I remove one cam cap at a time and slip some folded paper under the cap and re-torque the cam cap. This way the cam is held in place and then you can un-bolt the cam sprocket with an impact gun.
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Old 03-20-2006, 09:10 PM   #19
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If you keep the belt guides on the engine, it should keep the belt on the gears. You want a slow, gradual force on the breaker to prevent teeth jumping. We have a pretty serious timing belt on our cars that should hold everything in place.

Once we figured this out, it took us about 1min to break all 4
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Old 04-05-2006, 05:38 AM   #20
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I used a 1 1/8 wrench to hold the Cam as tight as i can and my buddy used a breaker bar with the Allen socket and we got them off pretty easy. This was on a JDM ver.8 motor too.
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Old 04-06-2006, 08:23 AM   #21
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the thing about using the crank bolt to keep the cams from spinning, is that it tightens the **** out of the crank bolt. then you have even more trouble if you need to remove that. if you need to take a cam gear off, just buy a new car. hahaha. what make them so tight, 6000rpm clutch dumps...? haha
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Old 04-06-2006, 12:35 PM   #22
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You can't use the 1 1/8 wrench on an STI. I did it this way. I put two of the flywheel bolts in and used a wrench between them that was long enough to touch the engine stand mounts. That way the crank bolt doesn't tighten and you can use both hands to loosen the cam gear bolts. It also makes it a one person job instead of 2+ like others have needed. I also found out that the Snap-on 10mm 1/2" drive hex socket was very strong and would not break like craftsman and several other that I broke. It lists of $20 but its worth it because you break several $10 sockets and never get one bolt loose.

Last edited by CK02WRX; 02-08-2010 at 06:06 AM.
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Old 06-15-2006, 11:50 PM   #23
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Quote:
Originally Posted by CK02WRX
You can't use the 1 1/8 wrench on an STI. I did it this way. I put two of the flywheel bolts in and used a wrench between them that was long enough to touch the engine stand mounts. That way the crank bolt doesn't tighten and you can use both hands to loosen the cam gear bolts. It also makes it a one person job instead of 2+ like others have needed. I also found out that the Snap-on 10mm 1/2" drive hex socket was very strong and would not break like craftsman and several other that I broke. It lists of $20 but its worth it because you break several $10 sockets and never get one bolt loose.

nice job.. its similar to what quirt had said, which i think is brilliant! ive always used the special tools because they are available to me. but i dont think i would have come up with such a effective method that you guys did. kudos to you guys.

oh almost forgot... snap on tools are the shizz! they dont give like cheaper tools, which round off bolts/nuts, and just leaves your frustrated because you now have to fix something stupid.
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Old 08-09-2007, 10:37 PM   #24
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Quote:
Originally Posted by CK02WRX View Post
You can't use the 1 1/8 wrench on an STI. I did it this way. I put two of the flywheel bolts in and used a wrench between them that was long enough to touch the engine stand mounts. That way the crank bolt doesn't tighten and you can use both hands to loosen the cam gear bolts. It also makes it a one person job instead of 2+ like others have needed. I also found out that the Snap-on 10mm 1/2" drive hex socket was very strong and would not break like craftsman and several other that I broke. It lists of $20 but its worth it because you break several $10 sockets and never get one bolt loose.
I fully endorse this method but I would suggest leaving the other pulleys/guides in place. With them in place the angle is such that more of the gear teath and timing belt are engaged making it less likey to slip.
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Old 08-25-2008, 06:22 AM   #25
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just want to say thanks for sharing this idea, used it today and it worked a charm!
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