AutoZone 1996 Ford Medium/HD Trk LN8000 8.3L Turbo Diesel 6cyl | Repair Guides | Engine And Engine Overhaul | Engine Mechanical | Timing Chain | AutoZone.com

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    Chevrolet Full Size Cars 1979-1989

    Timing Chain

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    Click image to see an enlarged view

    Fig. Fig. 1 Before removing the timing chain and gears, make sure the timing marks are in alignment



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    Fig. Fig. 2 Most timing chains are removed along with the camshaft sprocket

    REMOVAL & INSTALLATION



    Buick 231 V6 Engine


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    Fig. Fig. 3 Timing chain and gears 231 V6 engine

    1. Remove the timing chain cover. For details, refer to the procedure earlier in this section.
    2.  
    3. Before removing anything else, make sure the timing marks on the crankshaft and camshaft sprockets are aligned. This will greatly ease reinstallation of parts.
    4.  

    It is not necessary to remove the timing chain tensioners unless they are worn or damaged.

    1. Remove the front crankshaft oil slinger.
    2.  
    3. Remove the bolt and the special washer that hold the camshaft distributor drive gear and fuel pump eccentric at the forward end of the camshaft.
    4.  
    5. Using a pair of prybars, alternately pry the camshaft sprocket, then the crankshaft sprocket forward until the camshaft sprocket is free. Be careful not to damage the sprockets or the ends of the shafts.
    6.  
    7. Remove the camshaft sprocket along with the chain, then finish pulling the crankshaft sprocket off the shaft.
    8.  

    To install:

    1. If the engine has been disturbed, turn the the crankshaft so that the number one piston is at top dead center. With the crankshaft turned to No. 1 TDC, temporarily install the sprocket key and the camshaft sprocket on the camshaft, then turn the camshaft so that the index mark of the sprocket is pointing downward. Remove the key and the sprocket from the camshaft.
    2.  
    3. Make sure the sprocket keys are properly installed. Arrange the sprockets in the timing chain so the marks are aligned at the point closest together. Slide the sprocket and chain assembly on both the crankshaft and camshaft at the same time, making sure the marks remain aligned. An assistant may be helpful as it will be necessary to hold the chain tensioners out of the way while installing the timing chain and sprocket assembly.
    4.  
    5. Install the front oil slinger on the crankshaft with the concave side toward the front of the engine.
    6.  
    7. Install the fuel pump eccentric with the oil groove forward.
    8.  
    9. Install the distributor drive gear on the camshaft.
    10.  
    11. Install the front cover.
    12.  

    Chevrolet V6 and V8 Gasoline Engines


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    Fig. Fig. 4 Timing mark alignment during removal and installation of the chain assembly all V-type engines



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    Fig. Fig. 5 On 1980 and later V8 engines, camshaft timing mark alignment results in these engine timing positions

    1. Remove the timing chain cover. For details, refer to the procedure earlier in this section.
    2.  
    3. Turn the crankshaft until the mark on the camshaft sprocket aligns with the mark on the crankshaft sprocket.
    4.  
    5. Remove the camshaft sprocket bolts, then remove the camshaft sprocket and timing chain assembly. If necessary, remove the crankshaft sprocket with or after removing the assembly.
    6.  

    When installing the timing chain, install the sprockets with the timing marks facing each other; this position is TDC of the No. 6 cyl. (V8) or No. 4 cyl. (V6). To locate the TDC of the No. 1 cylinder, turn the crankshaft one full revolution, the camshaft timing mark will now be at the top of the sprocket.

    To install:

    1. If removed, install the crankshaft sprocket. Make sure the timing mark is at the top of the sprocket so the pistons are properly positioned to set engine timing.
    2.  
    3. Insert the camshaft timing sprocket into the timing chain so the mark on the sprocket is facing downward.
    4.  
    5. Install the bottom of the chain under the crankshaft sprocket as you install the camshaft sprocket to the end of the shaft. Make sure the sprockets are properly installed and seated, then make sure the timing marks are properly aligned.
    6.  
    7. Install and tighten the camshaft sprocket retaining bolts to 13-23 ft. lbs. (18-31 Nm).
    8.  
    9. Install the timing chain cover.
    10.  

    Oldsmobile 307 V8 Engine


    Click image to see an enlarged view

    Fig. Fig. 6 Timing mark alignment Oldsmobile produced 307 V8 engine

    1. Remove the timing chain cover. For details, refer to the procedure earlier in this section.
    2.  
    3. Turn the crankshaft until the mark on the camshaft sprocket aligns with the mark on the crankshaft sprocket.
    4.  
    5. Remove the crankcase oil slinger, then remove the camshaft thrust button and spring.
    6.  
    7. Remove the fuel pump and discard the gasket.
    8.  
    9. Loosen and remove the camshaft sprocket retaining bolt, then remove the fuel pump eccentric.
    10.  

    Be sure that the timing marks are in alignment before removing the timing chain and the camshaft sprocket.

    1. Remove the camshaft sprocket and timing chain assembly.
    2.  
    3. If necessary, remove the spark plugs to ease compression should the crankshaft need to turned. Engine and ignition timing will be lost if the crankshaft is turned while the timing chain is removed.
    4.  
    5. If necessary, remove the crankshaft key and use a suitable sprocket puller to remove the crankshaft sprocket.
    6.  

    To install:

    1. If the crankshaft sprocket was removed, place the timing chain on a flat surface and install the gears in the chain with the timing marks correctly aligned. Install the timing chain assembly to the engine.
    2.  
    3. If the crankshaft sprocket was not removed, position the camshaft sprocket in the timing chain, then position the chain under the crankshaft sprocket and install the assembly to the engine.
    4.  
    5. Install the fuel pump eccentric, flat side toward the engine, then install the camshaft sprocket retaining bolt finger tight.
    6.  
    7. If the crankshaft sprocket was removed, rotate the crankshaft as necessary until the keyways are aligned, then carefully tap the crankshaft key into position using a brass hammer. Tap until the key bottoms.
    8.  

    When the timing marks are aligned at the point of travel closest together, the NO. 6 piston is at TDC. When both timing marks are on top, No.1 cylinder is in the firing position.

    1. Tighten the camshaft sprocket to 65 ft. lbs. (88 Nm), then install the camshaft thrust button and spring.
    2.  
    3. Install the crankshaft oil slinger.
    4.  
    5. If removed, install the spark plugs.
    6.  
    7. Install the timing chain cover to the engine.
    8.  
    9. Install the fuel pump assembly using a new gasket.
    10.  
    11. Start and run the engine, then check for proper operation and for leaks.
    12.  

    Diesel Engine
    1. Remove the timing chain cover. For details, refer to the procedure earlier in this section.
    2.  
    3. Align the timing marks for ease of installation.
    4.  
    5. Remove the oil slinger and camshaft bolts, then remove the camshaft and crankshaft sprockets along with the timing chain as an assembly.
    6.  
    7. If replacement is necessary, remove the fuel pump eccentric from the crankshaft.
    8.  

    To install:

    1. If removed, install the key in the crankshaft and/or install the fuel pump eccentric.
    2.  
    3. Position the sprockets in the timing chain with the timing marks aligned. Install the camshaft and crankshaft sprockets along with the timing chain as an assembly.
    4.  
    5. Make sure the timing marks are still in alignment, then install and tighten the camshaft sprocket bolt to 65 ft. lbs. (88 Nm).
    6.  

    When the two timing marks are in alignment at the point they are closest together, the number six cylinder is at TDC. To obtain TDC for number one cylinder, slowly rotate the crankshaft one revolution. This will bring the camshaft sprocket mark to the top and the number one piston will then be in firing position.

    1. Install the oil slinger.
    2.  
    3. Install the timing chain front cover.
    4.  

    Any time the timing chain and gears are replaced, it will be necessary to retime the injection system. Refer to diesel engine injection timing in of this guide.

     
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