Chevrolet Cobalt Service & Repair Manual: Timing Chain Tensioner R & R
| 1. |
Disconnect the negative battery cable. |
| 2. |
Remove the camshaft cover. |
| 3. |
Remove the timing chain tensioner,
Fig. 1. |
| 4. |
Remove the seal from the tensioner. |
| 5. |
Reverse procedure to install, noting
the following: |
| |
a. |
Inspect the timing chain tensioner.
If the timing chain tensioner, O-ring seal, or washer is damaged,
replace the timing chain tensioner or O-ring seal as applicable. |
| |
b. |
Measure the timing chain tensioner
assembly from end to end. If the timing chain tensioner is to be
replaced, a new tensioner should be supplied in the fully compressed
non-active state. A tensioner in the compressed state will measure
2.83 inch (a) from end to end. A tensioner in the active state will
measure 3.35 inch (a) from end to end. |
| |
c. |
If the timing chain tensioner is not
in the compressed state, perform the following steps: Remove the
piston assembly from the body of the timing chain tensioner by pulling
it out. Install tool No. J-45027-2 (2) into a vise, then install
the notch end of the piston assembly into tool No. J-45027-2 (2).
Using tool No. J-45027-1 (1), turn the ratchet cylinder into the
piston, Fig. 2. |
| |
d. |
Torque timing chain tensioner
to 55 ft. lbs. |
| |
e. |
Torque camshaft cover and bolts
to 89 inch lbs. |
|
Fig. 1 Timing chain tensioner replacement
Fig. 2 Timing chain tensioner Installation
1.
Remove the engine coolant temperature
sensor, Fig. 1.
2.
Remove the thermostat and water feed
pipe retaining bolts, Fig. 2.
...
Caution: With the timing chain
removed, avoid turning the camshaft or crankshaft. If movement is required,
exercise extreme caution to avoid valve damage caused by piston contact.
...
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