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Old 05-06-2008, 11:10 PM   #1
Savage-Handbraking
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1995 Impreza L AWD
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Question Timing Belt Question

Hi,

The water pump went out in my '95 Impreza L, EJ18, so naturally I have decided to change my timing belt along with it.
From all I have gathered on the net, when installing the new timing belt, both cam pulleys and the crank sprocket should all have their "marks" pointing to 12 o'clock before installing the new belt. Right now, before taking off the old timing belt, when the crank sprocket is at 12, both cam pulleys are pointing to 10 o'clock. Now I realize that once the belt tensioner/idler is off the car and no belt is installed, the cam pulleys can be rotated seperate from the crank sprocket, but this should have a very severe impact on how the car runs. Before the car broke, it ran well in my opinion, with the marks not lined up, so it makes me wonder if it is severly out of mechanical time, or if this is normal. Has anyone ever ran into the same problem or have any help for me??? Thank you for any help!!!
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Old 05-06-2008, 11:25 PM   #2
silver2004impreza
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When I replaced my timing belt, I made my own marks with a grease pencil, one on each cam pulley, and one on the crank pulley, then I made matching marks on the block. When I was reinstalling the belt, I made sure that all the marks I had made were lined up.

Is your engine running poorly, or not shutting down properly when you turn it off? What I mean by not shutting down properly is does it keep running after you turn the key to the off position? If it's not running bad, or seemingly way down on power, I'd guess that your engine was still timed correctly. I don't know if the EJ18 is an interference motor or not, so I'd be reluctant to move the cams independent of the crank.
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Old 05-06-2008, 11:36 PM   #3
Savage-Handbraking
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Thanks!! I guess I never thought of making my own marks on the pulley. If I set the crank to 12 o'clock, then mark the cam pulleys at their 12 o'clock with a marker, it SHOULD be fool proof when I install the new belt.
No, it doesn't run badly at all right now, but it does have 175K on it, so it doesn't run tip-top. It has decent performance and dies after I turn the key off.
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Old 05-06-2008, 11:47 PM   #4
pwu_1
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http://www.subaru.com/microsites/spt...mation.sptmain
Look for the installation instructions for the STI Timing belt...should be fairly similar on your car...
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Old 05-07-2008, 12:36 AM   #5
birukun
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I used a white paint pen - grease pencil can be rubbed off. You may try that.

It is also a good time to mark the crank pulley's timing mark as well.
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Old 05-07-2008, 03:41 AM   #6
06grayrex
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Quote:
Originally Posted by Savage-Handbraking View Post
Thanks!! I guess I never thought of making my own marks on the pulley. If I set the crank to 12 o'clock, then mark the cam pulleys at their 12 o'clock with a marker, it SHOULD be fool proof when I install the new belt.
No, it doesn't run badly at all right now, but it does have 175K on it, so it doesn't run tip-top. It has decent performance and dies after I turn the key off.
If the cam pulleys were at 10 o'clock then the cams were retarded in relation to the crank. Yes I would make sure that the crank and cam pulleys are set to 12 o' clock when you install the timing belt. Make sure that tensioner is not leaking and that the idler pulleys are in good shape if not then replace them also while you're there because you don't want one of them to fail 10-20k miles later and have to do the job over again and or possibly damage the engine

edit: Are you using the arrows or the straight line marks on the cam and crank sprokets? You should be using the straight line marks on cam sprocket pointing 12 o'clock not the arrows on the inside of the sprocket which should be pointed close to 1:00-1:30. As far as the crank sprocket you should have the straight line mark pointing 12 o'clock and you will see that the tiangle mark pointing 90 degress to the right.

Here is a good thread with pics to help..
http://www.rs25.com/forums/showthread.php?t=28762

Last edited by 06grayrex; 05-07-2008 at 11:12 AM.
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