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DIY: SOHC Timing Belt Change w/ Pics! - Subaru Impreza GC8 & RS Forum & Community: RS25.com

22.06.2012 23:25:19http://www.rs25.com/forums/f105/t154453-diy-sohc-timing-belt-change-w-pics.html

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Subaru Impreza GC8 & RS Forum & Community: RS25.com > RS Club Technical > DIY - How / To InstallsDIY: SOHC Timing Belt Change w/ Pics!

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03-25-2011, 01:46 AM #1 (permalink)

pedpro2.0L Car: 95 Impreza Lx w/ Ver5EJ207Fav Mod: RHD SwapMy: Subaru PartsMy: Subaru BlogJoin Date: Sep 2010Location: Glendale, CATrader Rating: (5)Posts: 84

DIY: SOHC Timing Belt Change w/ Pics!

So, it's never be too late to buy a GC chassis Subaruand if your mileage is going high and it's time toreplace those timing belts! Subaru recommends timingbelt to be changed every 75k miles and changing idlergear/pullies and tensioner won't be a bad idea either. Idid this on my 2001 2.5rs MT and it was fairly easytask.

There are a few timing belt DIY around but I'm addingsome photos in there so it can clarify somemechanically-challenged owners.

Tools- 1/2 and 3/8 ratcheting wrenches- 10mm, 12mm, 14mm, 17mm, and 22mm sockets- Breaker bar + extension- small c-clamp- Nose plier- PB Blaster or WD-40- Gloves and goggles for safety

Unplug Spark Plug wires- Remove the 4 spark plug wires toward the top. Just pull them firmly gripping the end and they willpop out. This is crucial for bumping the crank bolt loose.

This image has been resized. Click this bar to view the full image. The original image is sized 800x600.



Removing the radiator fans- Start by going under the car and unplug the radiator fan connectors. There's 1 per fan. Simply liftup little tab and pull it to remove.





- Now that the fans are disconnected, remove the coolant reservoir by removing the 2 10mm bolts(red) and simply lift it up.- Remove the 2 10mm bolts securing the fan (orange) and lift up to remove the driver side fan.


- Remove the 2 10mm bolts on the passenger side fan and lift up to take it out.This image has been resized. Click this bar to view the full image. The original image is sized 800x600.



Removing the Alternator belt- Start by loosening (do NOT remove) the 12mm bolts (red) on the alternator and on the tensioner.Loosen them enough to be able to spin them by hand.- Loosen the 12mm Tensioner bolt (orange). As you loosen this bolt, you can push down thealternator, giving the belt enough slack to remove.


Remove the A/C belt- Start by loosening the idle pulley 12mm (red)- Loosen the 12mm tensioner bolt (orange) so it relieves the tension on the belt.- Finally, remove the 2 12mm bolts (blue).




- Remove the tensioner assembly.This image has been resized. Click this bar to view the full image. The original image is sized 800x600.

- Remove the a/c belt.

Remove the Crank pulley- This part is quite easy. Just place a 22mm socket on your trusty 1/2" ratcher or a breaker bar, finda long enough pipe or extension (mine was a floor jack handle) and rest it on DRIVER'S SIDE ground.




- Sit in the car, then crank your engine. It should come off on the first try. If not, try it again.- Once it's loose, remove the crank bolt and remove the crank pulley.

*EDIT*This is just one of many way to remove the crank bolt. I personally had no problem using this methodsince I don't have any air tools or impact wrenches. Due to popular demand, here's the link toanother way to remove the bolt

The BETTER way to remove your crank pulley!

Remove the Timing belt covers- This 2 piece plastic timing belt cover is held on by 13 10mm bolts (3 on driver's side, 10 onpassenger's side). They can all be reached from the engine bay and remove the driver's side first.


- Continue to the Passenger side and remove the cover.This image has been resized. Click this bar to view the full image. The original image is sized 800x600.



Remove the idler gear and pulley- Remove the lower left idler pulley by removing the 14mm bolt first to gain some slacks.


- Then, remove the idler gear by removing the 14mm bolt on the center.This image has been resized. Click this bar to view the full image. The original image is sized 800x600.



Remove the tensioner- Remove the tensioner by removing the 14mm bolt.- If you're planning on reusing the tensioner, you must compress the tensioner's hydraulic thingi. Youcan use a c clamp, or a table vise. Just remember to compress it slowly or it may damage thehydraulics. Compress the tensioner enough so you can insert a small nail, pin, or 2mm allen wrenchto hold the tension.


- Once the tensioner is out, remove the old belt.

Line up the Cam positions- On SOHC engines, the aligning the timing mark is quite easy. All you need to do is to line up 3markings. Period.




- First, line up the crank cam. There's a difference between a timing mark yellow) and the arrow (red). Line up the marking as shown.


- Next, line up the driver's side cam. Use 17mm socket wrench to turn the cam and align the marking.*This can be tricky because when the timing mark get closely align, you'll be fighting compression soyou'll have to use some force turning the gear. Don't use brute force! or it'll pass the timing mark andyou'll have to turn it again.




- Finally, line up the passenger side's cam. This one is easy. Just like the driver's side, use 17mmsocket wrench to turn and align it to the proper marking.


Install the new timing belt- I use the OEM Mitsuboshi timing belt and it came with TDC (top dead center) marking and other 2timing mark. In most cases, the new timing belts will have markings already printed.- On the FSM, teeth counts were supposed to be 44/40.5 tooth between the cams, but mine were44/47 tooth. Just go by the markings on the belt and you'll be fine.- Start by reinstalling the Tensioner assembly first. Install the 14mm bolt and tighten it to 39±4 N·m(4.0±0.4kg-m, 28.9±2.9ft-lb).

- Line up the Crank first.This image has been resized. Click this bar to view the full image. The original image is sized 800x600.



- Next, the driver's side.This image has been resized. Click this bar to view the full image. The original image is sized 800x600.

- Finally the passenger sideThis image has been resized. Click this bar to view the full image. The original image is sized 800x600.



- Let the belt sit as shown.This image has been resized. Click this bar to view the full image. The original image is sized 799x510.

- Since the driver's cam is quite unstable, I used a small c clamp to hold its belt location so I don'tlose my alignment. Don't clamp it too hard or you'll damage your new belt!




- Install the gear idler pulley and tighten it to 39±4 N·m (4.0±0.4 kg-m, 28.9±2.9 ft-lb).This image has been resized. Click this bar to view the full image. The original image is sized 800x600.

- Install the smooth idler pulley and tighten it to 39±4 N·m (4.0±0.4 kg-m, 28.9±2.9 ft-lb).This image has been resized. Click this bar to view the full image. The original image is sized 800x600.



- MAKE SURE the belt is still aligned to the timing belt before proceeding to the next step or you mayhave to start all over again!


- Now for the final step. Grab a nose plier and remove that grenade pin. Once the pin is removed, thehydraulic will kick in and tighten the belt.

This image has been resized. Click this bar to view the full image. The originalimage is sized 600x800.



- Now, use the 17mm socket wrench to turn the gears around. You'll be fighting the compression soyou'll have to use some force turning the belt around. Since the crank cam 24 teeth gear opposed todriver/passenger 48 teeth gear, the marking should align every 2 revolutions. Keep turning the beltaround to see consistence in timing alignment.


- When everything looks good, pat yourself in the back for a good job and reinstall everything inreverse order. Fire up the car and you're set for another 75k miles!

DisclaimerI am not responsible if you mess up your car by reading this DIY. I'm posting this DIY for referencesand some insights on this tedious install. If unsure about installing, please consult a professionalSubaru mechanic.

Last edited by pedpro; 06-04-2011 at 10:56 PM..

pics! - subaru impreza gc8 & rs forum & community_ rs25

Documents

rs forum amp

subaru impreza

17mm socket

12mm tensioner

rsti forum

idler gear

crank pulley

sized 800x600