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How-To: Timing Belt 1.8L and 1.6L

144K views 14 replies 10 participants last post by  ralph1981  
#1 ·
[h=1]Timing Belt Replacement (1.6L LDE, LXV, 1.8L 2H0, LUW And Lfh)[/h] [h=6]Timing Belt Replacement (1.6L LDE, LXV, 1.8L 2H0, LUW and LFH)[/h] Special Tools

  • EN-6333 Timing Belt Tensioner Locking Pin
  • EN-6340 Camshaft Locking Tool
  • EN-6625 Crankshaft Locking Device

For equivalent regional tools, refer to Special Tools.
Removal Procedure

  1. Open the hood.
  2. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement.
  3. Remove the timing belt upper front cover. Refer to Timing Belt Upper Front Cover Removal.
  4. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
  5. Remove the front compartment splash shield. Refer to Front Compartment Splash Shield Replacement.
  6. Remove the drive belt tensioner. Refer to Drive Belt Tensioner Replacement.
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  7. Set crankshaft balancer in direction of engine rotation until the markings (1) line up with the cylinder 1 at TDC.
  8. Remove the crankshaft balancer. Refer to Crankshaft Balancer Replacement (Refer To List 1).
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  9. Remove the 4 lower timing belt cover bolts (2).
  10. Remove the lower timing belt cover (1).
  11. Lower the vehicle.
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    NOTE
    Note: The right half of the EN-6340 locking tool can be recognized by the lettering "right", arrow, on the tool.
  12. Prepare the right half of the EN-6340 locking tool .
    • 12.1.
      Remove the 2 bolts (2).
    • 12.2.
      Remove the front panel (1) from the EN-6340 locking tool - right.
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    Click to Enlarge
  13. Install EN-6340 locking tool into the camshaft position actuator adjusters.
    • Note: The spot type marking (4) on the intake camshaft adjuster does not correspond to the groove of EN-6340-left during this process but must be somewhat above as shown.
    • Install EN-6340-left locking tool (1) in the camshaft position actuator adjusters as shown.
    • Note: The spot type marking (3) on the exhaust camshaft adjuster must correspond to the groove on EN-6340-right.
    • Install EN-6340 locking tool - right (2) in the camshaft position actuator adjusters as shown.
  14. Raise the vehicle.
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  15. Apply tension to the timing belt tensioner (2) in the direction of the arrow, using an Allen key (1).
  16. Install the EN-6333 locking pin (3).
  17. Lower the vehicle.
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    NOTE
    Note: Note the direction of the belt, if the timing belt will be reused.
  18. Remove the timing belt (1).
Installation Procedure
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NOTE
Note: Threading the timing belt through the engine mount bracket is only permissible in conjunction with the assembly tool supplied with NEW timing belts or otherwise it is possible to damage the toothed belt at this stage by kinking it.

NOTE
Note: If the toothed belt has been used, observe the direction of rotation.

  1. Install the timing belt (1) in the enclosed assembly tool (2).
  2. Guide the timing belt through the engine mount bracket with the assembly tool.
  3. Remove the assembly tool.
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  4. Install the timing belt (1).
  5. Guide the timing belt past the tensioner and place it on the crankshaft sprocket wheel.
  6. Place the timing belt on the exhaust and intake camshaft position actuator adjusters.
  7. Raise the vehicle.
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    Click to Enlarge
  8. Apply tension to the timing belt tensioner (2) in the direction of the arrow, using an Allen key (1).
  9. Remove the EN-6333 locking pin (3).

    NOTE
    Note: The timing belt tensioner moves automatically to the correct position.
  10. Release tension on timing belt tensioner.
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  11. Remove the fastener (1).
  12. Remove EN-6625 locking device (2).
  13. Lower the vehicle.
  14. Remove EN-6340 locking tool .
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    Click to Enlarge
  15. Check the timing.
    • Note: Note the marking at the camshaft sprockets.
    • Turn the crankshaft 720° in the direction of engine rotation by the bolt on the crankshaft balancer.
    • Note: The spot type marking (4) on the intake camshaft position actuator adjuster does not correspond to the groove of EN-6340-left during this process but must be slightly above as shown.
    • Install EN-6340 locking tool - left (1) into the camshaft position actuator adjusters as shown.
    • Note: The spot type marking (3) on the exhaust camshaft position actuator adjuster must correspond to the groove on EN-6340-right.
    • Install EN-6340 locking tool - right (2) into the camshaft position actuator adjusters as shown.
  16. Raise the vehicle.
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    Click to Enlarge

    NOTE
    Note: The crankshaft sprocket and oil pump housing must align.
  17. Check the crankshaft position.
  18. Lower the vehicle.
  19. Remove the EN-6340 locking tool .
  20. Raise the vehicle.
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    Click to Enlarge
  21. Install the lower timing belt cover (1).

    CAUTION
    Caution: Refer to Fastener Caution in the Preface section.
  22. Install the 4 lower timing belt cover bolts (2) and tighten to 6 N·m (53 lb in).
  23. Install the crankshaft balancer. Refer to Crankshaft Balancer Replacement (Refer To List 1).
  24. Install the drive belt tensioner. Refer to Drive Belt Tensioner Replacement.
  25. Install the compartment splash shield. Refer to Front Compartment Splash Shield Replacement.
  26. Lower the vehicle.
  27. Install the timing belt upper front cover. Refer to Timing Belt Upper Front Cover Replacement.
  28. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement.
  29. Close the hood.
 
#6 ·
Re: EN-6625, it doesn't tell you when to do it because this isn't a 100% complete step by step set of instructions. It is installed during the steps that need to be done to remove the balancer.

Re:EN-6340, the first time you install it it is to hold the cams timed while you have to belt off and are installing the new one. You remove them so you can spin the engine over, and you them back on to verify the timing.
 
#11 · (Edited)
In replacing the timing belt on the 1.8, perhaps the biggest stumbling block for me was getting the new belt on the tensioner. I fought that thing for quite a while trying to slip it over the wheel. I even tried to slip it partially off the crank gear to provide more slack at the tensioner, but to no avail.

I called my wife and daughter out, and had them helping me up top while I was working from below by the crank. We fiddled with it for quite a while. Finally, in frustration, I over-torqued the allen wrench and, voila, I got another 20 or 30 degrees rotation out of the tensioner, enough to easily slip the belt in place. Needless to say, I was greatly relieved.

I wasn't sure how I managed that, but I did check it on the old tensioner to verify how it works. Apparently, the tensioner has a 2-stage spring in it. The first spring allows about 30° of rotation, then it feels like you've hit the stop. But if you torque harder on it, you can get another 20-30 degrees of rotation, enough to finally get the belt around the pulley.

None of the guides I was using mentioned that (Haynes hardcopy, Chilton on-line).

Knowing that would have saved me close to an hour. Hopefully, this helps someone else avoid this migraine.

To turn the tensioner, I used a socket handle and 6mm allen socket. The fit seemed a little loose in the tensioners, both the old one and the new, yet a ÂĽ" allen wrench was too big to insert. The only choice was the 6mm, but a tighter fit would have been preferred (to give more feel).

I was able to remove the belt from the old tensioner without using the locking tool (EN-6333 above). I was surprised the new tensioner lacked the hole for the locking tool ! But again, it was not needed during the installation.

Similarly, the tool kit includes a locking pin (EN-6349) for the drive belt tensioner, but it was not needed, either.

So neither of the tensioner locking tools were really needed. But knowledge that the timing belt tensioner had a 2-stage spring was critical.

Doug

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#12 · (Edited)
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On the 1.8, the other tricky part was installing the cam locking tool. It is two pieces which must be slid in between the two cam gears. Extra hands are needed. Someone has to be slightly rocking the crank while the other is up top holding the two pieces against the two gears while trying to line them up with each other. You gotta hold your tongue just right.

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Book time on this job is about 2 hours. I probably have 6 times that. I was taking my time, taking lots of pics, reading and re-reading the manuals, and making sure I was following the Mechanocratic oath: "First, don't break anything."

But with a couple more go-rounds, I could maybe get it down to 2 hours :)

As for the $22 tool kit, below are some high-ball prices I culled form Google for the genuine Kent Moore pieces. They make Snap-On look very affordable! That said, the actual KM tools can be had for less, but are still expensive. The $22 no-name brand stuff was more than up to the task.

KM-6340 cam locking tool
$331.24

KM-6625 flywheel/crank locking tool
$83.35

KM-6349 drive belt tensioner locking tool <-- didn't use
$19.99

KM-6333 timing belt tensioner locking tool <-- didn't use
$65.75

KM-45059 angle meter <-- used mechanical version instead
$728.32

As mentioned earlier, I didn't use either of the locking pins - neither of the tensioners really needed to be locked.

In lieu of the expensive electronic angle meter, I bought a 15 dollar mechanical unit at Autozone. It's not as easy to use, but I can afford it.

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I will say, the angle meter is kind of tricky to use, and I probably didn't get very close on the numbers. IIRC, the procedure is to tighten the tensioner mounting bolt to 15 ft-lbs, then turn it another 120°, then turn it another 15°. My 120 was probably ±30 And it might have taken two pulls to get there rather than one continuous crank.

The 15° turn was probably within ±10° of spec, I hope.

Using the mechanical angle gauge requires some practice, and, despite me working at it, I still struggled with it. Also, there's not always a place for the hook on the back to rest against. The hook is supposed to hold the dial face steady while you rotate the wrench and corresponding needle on the face of the dial.

Anyway, this torque-to-yield stuff is out of my area of expertise, and I try to respect the engineering behind it, but my internal BS detector keeps me wondering how critical those angles are.

Nevertheless, I try to go by the book. A lot less stuff gets broken that way.

Overall, I have less than 40 bucks in these tools. Add another 25 for the reverse torx socket set I recently purchased. So despite some daunting numbers for the Kent-Moore stuff, the actual cost is very acceptable. By doing this myself, I still saved lots of money despite needing special tools for it.

Never start a project unless you can get some new tools out of it :)

Doug
 
#13 ·
On aligning the crank at top-dead-center, despite looking in the right place, the alignment marks were not obvious. I had to look closely to find them. But, once you see them, they're easy to use.

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This wasn't really necessary, but it's something I did just to satisfy my own concerns.
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I removed the #1 plug, inserted a wooden dowel, and turned the engine close to top-dead-center, then marked the dowel. Next I rocked the crank back and forth until I got the mark as high as possible, then put another mark below it even with the tape, knowing that was TDC.

About that time, I remembered there were marks on the crank pulley and realized I didn't really need this :)

Doug
 
#15 ·
I like this guys guide. Timing belt replacement on a cruze 1.8l with 130k miles. 30k miles beyond recommended interval. He used an aftermarket kit though, not Gates.

In researching the cheap timing kits fail because of bad bearings in the tensioner or idler pully. Possibly because of worker slacking off at the factory. Not enough grease.