GMC 14087014 Chain,Camshaft Timing

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To remove and install the timing chain and sprockets, begin by disconnecting the negative battery cable and removing the front cover. Take off the oil slinger from the crankshaft and rotate the engine to align the cam gear timing marks, ensuring the No. 1 cylinder is on the TDC of its compression stroke. From the camshaft, remove the camshaft thrust button and screw, and discard the thrust button. Slide out the cam gear, crankshaft sprocket, and timing chain as an assembly. To install, clean the gasket mounting surfaces and inspect all parts for wear or damage, replacing as necessary. Assemble the timing chain on the cam gear and crankshaft sprockets, align the timing marks on the sprockets to face each other, and align the dowel pin in the cam gear with the index hole in the sprocket; then slide the assembly onto the cam gear and install the sprocket-to-cam gear bolts, tightening it to 37 ft. lbs. Install the new thrust button and the oil slinger, followed by the front cover. Finally, connect the negative battery cable, refill the cooling system, start the engine, allow it to reach normal operating temperatures, and check for leaks.

Remove the timing chain cover and temporarily install the harmonic balancer bolt and washer in the end of the crankshaft. Turn the crankshaft so that the sprocket timing marks are positioned toward each other, then remove the harmonic bolt and washer without changing the position of the sprockets, using a sharp tap on the wrench handle if necessary. Next, remove the front crankshaft oil slinger and the camshaft sprocket bolts, followed by the oil pan. Use two large screwdrivers to carefully pry the camshaft sprocket and then the crankshaft sprocket forward alternately until the camshaft sprocket is free, then remove both the camshaft sprocket and chain, and work the crankshaft sprocket off the crankshaft. If the chain is not stretched and parts are to be re-used, clean the timing chain, sprockets, and crankshaft oil slinger thoroughly in the proper solvent. If the engine was not rotated while the chain and sprockets were off, install the sprockets and chain with the timing marks perfectly inline, exactly as they were on removal. If the engine was rotated, temporarily install the sprockets and turn the crankshaft until the number one piston is at Top Dead Center and the camshaft O mark is straight down and on the centerline of both shafts. Remove the sprockets and assemble the timing chain on both sprockets, sliding the chain assembly onto the shafts with the O marks in their closest together positions and in-line with the sprocket hubs. Assemble the oil slinger on the crankshaft with the inside diameter against the sprocket, then install the camshaft sprocket bolts and torque-tighten to specifications. Finally, install the oil pan using a new gasket and then install the timing chain cover.

Remove the timing chain cover and temporarily install the harmonic balancer bolt and washer in the end of the crankshaft. Turn the crankshaft so that the sprocket timing marks are positioned toward each other, then remove the harmonic bolt and washer without changing the position of the sprockets, using a sharp tap on the wrench handle if necessary. Next, remove the front crankshaft oil slinger and the camshaft sprocket bolts, followed by the oil pan. Use two large screwdrivers to carefully pry the camshaft sprocket and then the crankshaft sprocket forward alternately until the camshaft sprocket is free, then remove both the camshaft sprocket and chain, and work the crankshaft sprocket off the crankshaft. If the chain is not stretched and parts are to be re-used, clean the timing chain, sprockets, and crankshaft oil slinger thoroughly in the proper solvent. If the engine was not rotated while the chain and sprockets were off, install the sprockets and chain with the timing marks perfectly in line, exactly as they were on removal. If the engine was rotated, temporarily install the sprockets and turn the crankshaft until the number one piston is at Top Dead Center and the camshaft O mark is straight down and on the centerline of both shafts. Remove the sprockets and assemble the timing chain on both sprockets, sliding the chain assembly onto the shafts with the O marks in their closest together positions and in line with the sprocket hubs. Assemble the oil slinger on the crankshaft with the inside diameter against the sprocket, then install the camshaft sprocket bolts and torque-tighten to specifications. Finally, install the oil pan using a new gasket and the timing chain cover.

Loosen the cable on the negative terminal of the battery, right, then remove the vibration damper and crankcase cover. Remove all of the spark plugs from the engine. Loosely replace the crankshaft pulley bolt with several thickness of washer or spacer and rotate the crankshaft in anticlockwise direction to align the timing mark on crank shaft and cam shaft so that the camshaft sprocket and chain will also be properly aligned. Head the camshaft sprocket mounting bolts, held the camshaft sprocket from the camshaft and get rid of the sprocket and chain. If required, employ the special tool of puller to remove the crankshaft sprocket. Fits the crankshaft sprocket on the crankshaft in the same way in which it was removed by using one of the bolts and washers from the puller. Place the timing chain above the camshaft sprocket and provide some tension by having some part of the chain hang over the crankshaft sprocket. When the timing marks perfectly align, then place the chain over the crankshaft sprocket and then slide the camshaft sprocket over and tighten the bolts. After that check the alignment of the timing marks both on camshaft and crank shaft sprockets where camshaft sprocket mark should be made at 6 'o' clock and crank sprocket mark should be made at 12 'o' clock and a line passing through the center of both sprockets must pass through both timing marks. If misaligned, position the camshaft sprocket as it is indicated that upon proper alignment, the engine is set in a manner whereby the number six piston is at TDC on the compression stroke. Last but not the least, pour some drops of engine oil on the chain and fit all the other parts starting from the one, which was removed last.

Start by detaching the water pump and then remove the bolts to separate the crankshaft drivebelt pulley from the vibration damper, using a six-point socket and breaker bar for the tight vibration damper bolt.

Before installing the timing chain cover, use a gasket scraper to remove old gasket material and sealant. Clean the cover and block sealing surfaces with lacquer thinner or acetone.

Install the timing chain cover using a new rubber seal.

Gasket removal and surface cleaning are critical, along with checks and corrections of the cover flange if needed. Proper alignment of keyways is emphasized when installing new parts like the crankshaft sprocket, camshaft sprocket, and vibration damper. Lubrication with engine oil is necessary, and sealant application is required for specific engine types.

If it is necessary to remove the crankcase sprocket, use a puller designed for this purpose.

Begin by removing the torsional damper and crankcase.

Align the balance shaft gears before installing the timing chain and camshaft sprocket, ensuring the timing marks are correctly positioned.

Next, remove the crankshaft balancer, disconnect the wiring from the camshaft position sensor and actuator magnet if equipped, and take off the timing chain cover by removing its mounting bolts, ensuring not to damage the cover.

Most engines use a large bolt threaded into the crankshaft's nose to secure the vibration damper. It should be removed with a puller that exerts force solely on the damper hub to avoid damage.

To separate the timing chain cover from the block, you should remove the cover bolts, breaking the gasket seal if necessary.

The number four piston should be at top dead center (TDC) on the compression stroke before proceeding with timing chain cover removal.

Use a gasket scraper to remove any old gasket material and clean the sealing surfaces.

The number four piston should be at top dead center (TDC) on the compression stroke before proceeding with timing chain cover removal.

Inspect the timing chain and sprockets for wear and damage. If necessary, replace them.

Disconnect the negative battery cable.

Slip the chain over the crankshaft sprocket and draw the camshaft sprocket into place with the retaining bolts, avoiding any hammering that could dislodge the Welch plug.