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Old 09-19-2005, 01:22 PM   #1
tonyakavw
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Default Timing Belt install questions

I'm replacing the timing belt on my 2001 2.5RS engine and after cutting off the old one I noticed that I hadn't rotated the engine such that the cams have their indicator pointing straight up. Is this a problem? When I go back to put the new belt on, how can I ensure that the alignment is still on? Could I possibly get it on pretty close (within a tooth or two), rotate the engine to the correct position and then do the final alignment that way?

Also, the idler pulleys have some surface rust on them due to the fact that this engine was stored for some time with a broken/missing timing belt cover. The worst ones are the ones where the outside of the belt runs over. The toother one is not bad at all, just very light surface roughness. Is this sometihng I could sand smooth with some 400/600 sand paper and then polish? Or should I just buy new ones?

-Tony
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Old 09-19-2005, 02:12 PM   #2
Tim Sanderson
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Car in neutral.e-brake on. battery negative disconnected
pull the plugs.(easier to rotate motor and "feel" it)
Rotate the crank and align the timing mark(it's the single slash on the rear tooth, not the triangle)
Rotate the cam sprockets to align their timing marks.

I recommend using only oem subaru belts. They have install marks on them. and You can pretty much trust that they are correct.

Good luck.
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Old 09-19-2005, 04:27 PM   #3
Hayes
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The crank must have the timing mark up when #1 piston is at top dead center on the compression stroke and not the exhaust stroke. The idler pullies should be smooth or replace them. I think crocus cloth is the best way to try to polish them.
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Old 09-19-2005, 05:04 PM   #4
Tim Sanderson
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Quote:
Originally Posted by Hayes
The crank must have the timing mark up when #1 piston is at top dead center on the compression stroke and not the exhaust stroke. The idler pullies should be smooth or replace them. I think crocus cloth is the best way to try to polish them.
That is incorrect sir. When the crank sprocket timing mark is aligned all four pistons are half way up the cylinders. The timing mark is not tdc anything.
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Old 09-19-2005, 07:49 PM   #5
Texas25RS
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Cut the TB off... why does the soudn of that worry me... You shouldn't have need to do that...
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Old 09-19-2005, 09:27 PM   #6
Legacy777
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Quote:
Originally Posted by Tim Sanderson
That is incorrect sir. When the crank sprocket timing mark is aligned all four pistons are half way up the cylinders. The timing mark is not tdc anything.
Ditto.

Here's scans for the 2.2 liter, but should be the same for the SOHC 2.5's

http://www.main.experiencetherave.co...ming_belt1.jpg
http://www.main.experiencetherave.co...ming_belt2.jpg
http://www.main.experiencetherave.co...ming_belt3.jpg
http://www.main.experiencetherave.co...ming_belt4.jpg
http://www.main.experiencetherave.co...ming_belt5.jpg
http://www.main.experiencetherave.co...ming_belt6.jpg
http://www.main.experiencetherave.co...ming_belt7.jpg
http://www.main.experiencetherave.co...ming_belt8.jpg
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Old 09-19-2005, 09:39 PM   #7
Hayes
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Tim is correct. I was thinking about a camshaft that turns at 1.2 crank speed. sorry. ed
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Old 09-19-2005, 10:59 PM   #8
Tim Sanderson
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That's awesome legacy777! IF people decide to search they would find some good info there. Sometimes people get baffled with the old style tensioner.

Thanks for the links man.

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Old 09-20-2005, 08:40 AM   #9
Legacy777
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Welcome.
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Old 09-21-2005, 10:12 PM   #10
John2.5RS
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Exclamation woah!

You don't want the pistons at TDC. they should be half way so you don't bang the valves with the pistons. Make sure you rotate the crank slowly by hand, then line up the cams after the crank. The Crank doesn't have a exhaust/compression stroke, that has to do with the cam position, the crank maintains the same rotaton, and doesn't care about the exhaust or compression strock, per say. The crank will rotate the same regardless of the camshafts' postion, but to make the engine run, you will have to line up the timing marks. The driver side pulley can be a pain to keep on it's mark sometimes, If I were you, If you have an adjustable rubber oil filter band wrench or something to keep the cam from rotating out of position, have a friend hold the camshaft sprocket while you put the belt on. I've done it myself several times but the first time was a PITA.
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Old 09-21-2005, 10:13 PM   #11
John2.5RS
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Thumbs up A little FYI

I may be a little off right now, I just got off aof work a couple of hours ago and I had a couple jack n cokes.
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Old 09-22-2005, 12:24 PM   #12
tonyakavw
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Default

Thanks for all the tips. I have the engine sitting on a furniture dolly currently, so access to the front of the motor is very good.

After reading the comments and looking at the factory service manual, I'm almost wondering if I even need to move anything at all. As long as I get the lines lined up on the crankshaft and cams, it seems like the timing will be on. And since the motor is out of the car, there is no problem with being able to see that things are lined up.

-Tony
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