Question about 1988 Chevrolet Blazer

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Cannot get timing gear off crankshaft to replace- does not have chain.

I have a 1988 s-10 Blazer 2.5. There is no timng chain, only 2 gears, cam and crankshaft. I need to know how to get the gear off the camshaft.

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  • cbenefield2 Apr 14, 2009

    rasecar,do you remember what the tools were and how you made them? This might help.

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The gear is press fit onto the camshaft. The proper way to repair it is pull the camshaft and have the gear pressed off and a new one pressed on.
At one time I had made tools to do this job without removing the cam from the engine. I no longer have the tools, they were borrowed and not returned.

Posted on Apr 13, 2009

  • rasecar Apr 15, 2009

    The tools were.
    1] a bottoming tap to thread the hole in the cam so the gear can be pressed back on.
    2]a harmonic balancer installer [required modification]
    3a puller for the gear. matco diff. side bearing puller, kent- moore jaws, and a home made adapter.
    the plastic gears would frequently break when removing, and you be very careful not to break the cam retainer plate located behind the gear.


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How to replace timing chain with timing marks both camshaft and crankshaft


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Print


REMOVAL & INSTALLATION

4.3L, 5.0L, 5.7L and 7.4L Engines
See Figures 1, 2, 3, 4, 5 and 6

  1. Remove the timing cover. This will allow access to the timing chain.
  2. Crank the engine until the timing marks on both sprockets are nearest each other and in line between the shaft centers.



0996b43f80219aca.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 1: Crank the engine until the timing marks on both sprockets are in line

  1. On 1996-98 vehicles remove the crankshaft position sensor reluctor ring, if equipped. On 7.4L engines tool J-41371 or its equivalent puller must be used to remove the reluctor ring.
  2. Take out the bolts that hold the camshaft gear to the camshaft. This gear is a light press fit on the camshaft and will come off easily. It is located by a dowel. The chain comes off with the camshaft gear.



0996b43f80219acb.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 2: Remove the camshaft gear retaining bolts


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Fig. Fig. 3: Remove the camshaft gear and timing chain
A gear puller will be required to remove the crankshaft gear.
To install:

  1. Without disturbing the position of the engine, mount the new crankshaft gear on the shaft, and mount the chain over the camshaft gear. Arrange the camshaft gear in such a way that the timing marks will line up between the shaft centers and the camshaft locating dowel will enter the dowel hole in the cam sprocket.
  2. Place the cam sprocket, with its chain mounted over it, in position on the front of the truck and pull up with the three bolts that hold it to the camshaft.
  3. After the gears are in place, turn the engine two full revolutions to make certain that the timing marks are in correct alignment between the shaft centers. Tighten the camshaft sprocket bolts (and nut on the 4.3L) to 21 ft. lbs. (28 Nm) on 1988-95 models. On 1996-98 models, tighten the bolts to 18 ft. Lbs. (25 Nm). On the 7.4L, tighten them to 20 ft. lbs. (26 Nm) on 1988-95 models. On 1996-98 models, tighten the bolts to 25 ft. Lbs. (34 Nm).

When installing the crankshaft position sensor you must use install a new oil ring seal onto the sensor.
  1. Install the crankshaft position sensor reluctor ring (if equipped), onto the crankshaft until it is firmly seated against the crankshaft sprocket. On 1996-98 7.4L vehicles replace the reluctor ring with a new component.
  2. Install the front cover, torsional damper, water pump and the radiator.



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Fig. Fig. 4: A gear puller will be required to remove the crankshaft gear


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Fig. Fig. 5: Timing mark alignment-4.3L, 5.0L, 5.7L and 7.4L engines

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Timing Chain & Gears Removal & Installation To Remove:
NOTE: Keep the cam chain away from magnetic fields.
Crankshaft set at TDC marks hnda_trk_crv_crank_tdc_marks.gif

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  3. Remove the front tires/wheels. Front undercar splash shield hnda_trk_crv_frt_under_splsh_shld.gif

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During most engine rebuilds, a completely new timing assembly should be installed. If wear exists on any component, replacement of the entire assembly is necessary. Wear in the chain, gears, or sprockets means a timing lag, which results in poor engine performance.
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