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Old 04-29-2009, 03:39 PM   #1
subienewb29
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Default EJ25 SOHC Timing Belt Diagram HELP

Im installing a timing belt on a 2001 Impreza RS2.5 SOHC motor. EJ251. I need a timing belt diagram PLEASE. I seached for about 30 mins and found one for a 2.2 and dohc only. Im starting from scratch so need to find TDC. Also do I have to turn the cams so many times to have the valves open or closed? Or do I just line the crank pulley marks up? I know somebodys gonna bitch about not researching. I did so just help me out. Throw me a link or something. Thanks
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Old 04-29-2009, 04:17 PM   #2
AdamMc
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i Researched for atleast a good year! and i purchased the mechanics manuals in PDF form off ebay to help out.

basically this is what you have to do.


Strip down what ever you need to, to get into the timing belt chamber (If you dont konw where this is, let me know and ill explain further).

When you've got to the point where you have the crank shaft pulley off and the timing covers off and you're looking at the timing belt itself - Put the Crankshaft pulley/Crankbolt back on. hand crank the car until your car is at absolute zero.

Absolute zero will be when the timing marks on the gears, sprockets, cams what ever you want to call them - line up with the timing marks on the engine wall. You'll probably also see the belt timing markers centered at the top.

From there, you know that your engine is at absolute zero.

Slowly (Subaru states ~3 mins) depress the tensioner making sure not to go too fast or you'll blow the internals of it. Once you push it down enough - stick an allan key or a nail into the hole to hold it in place (you'll know what i mean when you get there).

If you've got gear locks, use them. They prevent the cams/gears/sprockets, what ever, from turning when you take the old belt off.

basic premise:
Get your engine to absolute zero. Make specific note of all the timing markers on EVERY pulley/gear/cam that the belt is touching - take pictures if you have to, or draw one.

Install the new Timing belt in the exact same position (paying attention to timing markers on the pulleys as well as the timing marks on the belt itself).

When you think you have it right, let the tensioner out slowly.

Put crankshaft pulley/bolt back on and HAND CRANK the engine slowly. You're feeling for any resistence or metal clanking. If you feel like parts are colliding internally - you've done it wrong and you need to back off and Re-assess what you've done w/ your belt/gear/pulley/cams positioning.


I hope that helps a bit. As for a picture - You could search on ebay and buy your mechanics service manuals for Cheap (although im not sure if it was a legal sale: i purchased mine for a 02 impreza 2.5 RS SOHC for $15 canadian off ebay).
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Old 04-29-2009, 04:21 PM   #3
AdamMc
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note: what i call absolute Zero is probably your Top dead Center. You know your'e there when all your alignment marks are lined up.
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Old 04-29-2009, 06:21 PM   #4
subienewb29
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Hey man Thanks for going out of your way. I really appreciate it. I only have on question. What if the belt is already off and I need to find TDC or absolte zero? Can I just turn everything until it lines up with the markings and put the belt on. Or do I turn the cam 180 and the other 180 or whatever. Im just use to a 240sx motor. Cam lupes most be facing up meaning vavles are open. Just wanna know if I gotta do something like that or i just turn the cams spockets until they line up with the marks on motor. Thanks again
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Old 04-29-2009, 06:36 PM   #5
coldturbo
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The End Wrench group have a full write-up for the SOHC, its a 2.2 but should be close to the same as all Subaru engines are like Lego building blocks.

http://endwrench.com/images/pdfs/2.2SingleOverWin01.pdf

http://endwrench.com/images/pdfs/TBeltEWWin05.pdf
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Old 04-29-2009, 08:43 PM   #6
subienewb29
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Thanks
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