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With Cam Caps loosened, FIRST loosen timing chain tensioner, press it in to loosen tension, Crank using ratchet to TDC (Top Dead Center on crank pully, (to keep from damage to pistons), align Exhaust Cam Timing Mark to mark on #1 Exhaust cam cover, then take up slack between Exhaust & Intake Cams (on top between the cams), Then align the Intake Cam to mark on #1 Cam Cap, "Now" loosen the 17mm bolt to tighten timing chain, rotate engine using rachet two times, reset TDC at the crank, and look at "Cam Timing Marks on both the Exhaust, and Intake Cams. If you did all this correctly the "Timing Marks" should be lined up so TDC,Exhaust, and Intake marks are all the same.
Remove camshaft covrs Remove front cover Remove or fully retract all three timing chain tensioners Remove oil pump Primary and secondary chain guides should remain in place. Rotate crankshaft until sprocket drive key is at about 1 o'clock position. Set crankshaft and intermediate shaft sprockets into primary drive chain with their timing marks asjacent to each other. Install crankshaft and intermediate sprockets over their respective shafts. Rotating crankshaft as necessary to engage crankshaft key in sprocket without changing the timing mark relationship. Install Flywheel Holder Tool (J-39411) to lock crankshaft in position. Install intermediate shaft sprocket retaining bolt and torque to specifications. Route secondary chain for left cylinder head over inner row of intermediate shaft teeth. Route secondary drive chain over chain guide, and install exhaust cam sprocket to chain so camshaft drive pin engages the sprocket notch marked "LE" (Left Exhaust). There dhould be no slack in the lower section of the chain, and the camshaft drive pin must be perpendicular (90 degrees) to the cylinder head surface. Install the intake camshaft sprocket into the chain so the sprocket notch marked "LI" (Left Intake) engages camshaft drive pin, while drive pin remains perpendicular to the head face. Minor adjustments can be made to camshaft position to get pin to engage by using a wrench on the hex cast into the camshaft. Install sprocket retainer bolts and torque to specification. Repet steps as above to install the right secondary chain to the right camshafts. The right camshaft sprockets are marked "RE" and "RI". In addition, the RE sprocket must contain the camshaft position sensor pickup.
Remove the alternator. Remove the drive belt idler. Remove the drive belt tensioner. Remove the water pump pulley. Remove the intake manifold.
Remove the connector bracket from the left cylinder head cover. Disconnect the right ignition coil connector, condenser connector and remove the bracket.
Remove the left cylinder head cover retaining bolts. Remove the cylinder head cover from the engine.
Remove the right cylinder head cover retaining bolts. Remove the cylinder head cover from the engine.
Set the No. 1 cylinder to TDC on the compression stroke. Turn the crankshaft pulley and align its groove with the timing mark T of the lower timing chain cover.
Check that the mark of the camshaft timing sprockets are in straight line positioning on the cylinder head surface. If not rotate the crankshaft 360 degrees. Do not rotate the engine counterclockwise.
Remove the oil pan. Remove the crankshaft damper pulley. Remove the timing chain cover.
Be careful not to damage the contact surfaces of the cylinder block, cylinder head and timing chain cover. Before removing the timing chain, mark the right and left timing chains with an identification mark based on the location of the sprocket because the identification mark on the chain for TDC can be erased.
After compressing the timing chain tensioner, install a set pin. Remove the right cam to cam guide. Remove the right timing chain auto tensioner and timing chain tensioner arm.
Remove the oil pump chain cover. Remove the oil pump chain tensioner assembly. Remove the oil pump chain guide. Remove the right timing chain.
Remove the right timing chain guide. Remove the oil pump chain sprocket and oil pump chain. Remove the crankshaft sprocket, oil pump and camshaft drive gear.
Remove the left cam to cam guide. Remove the left timing chain auto tensioner and timing chain tensioner arm. Remove the left timing chain.
Remove the left timing chain guide. Remove the crankshaft sprocket and left camshaft drive. Remove the tensioner adapter assembly.
Fig. Timing chain and related components-3.8L Engine
Check the camshaft and crankshaft sprockets for wear and damage, replace as required.
Inspect the tensioner arm and chain guide for wear and damage, replace as required.
Check that the tensioner pin moves smoothly when the ratchet pawl is released with a thin rod.
The key of the crankshaft should be aligned with the timing mark of the timing chain cover. This indicates that the piston is at TDC on the compression stroke.
Install the tensioner adapter assembly. Install the crankshaft sprocket and left camshaft drive.
Install the left timing chain guide and torque the retaining bolts 14-18 ft. lbs.
Install the left timing chain. Be sure to install the chain with no slack between the camshaft and the crankshaft (crankshaft sprocket, timing chain guide, exhaust camshaft sprocket, intake camshaft sprocket). The timing mark of each sprocket should be matched with the timing mark (color ink) of the timing chain at installation of the timing chain.
Fig. Left timing chain markings and installation: (D) exhaust camshaft sprocket (C) intake camshaft sprocket-3.8L Engine
Install the left timing chain tensioner arm and torque the retaining bolts 14-16 ft. lbs.
Install the left timing chain tensioner and torque the retaining bolts 7-9 ft. lbs.
Install the left cam to cam guide and torque the retaining bolts 7-9 ft. lbs.
Install the crankshaft sprocket, oil pump and right camshaft drive.
Install the oil pump chain and oil pump sprocket. Torque the retaining bolt to 14-16 ft. lbs.
Install the right timing chain guide. Torque the retaining bolts to 14-18 ft. lbs.
Install the right timing chain. Be sure to install the chain with no slack between the camshaft and the crankshaft (crankshaft sprocket, intake camshaft sprocket, exhaust camshaft sprocket). The timing mark of each sprocket should be matched with the timing mark (color ink) of the timing chain at installation of the timing chain.
Fig. Right timing chain markings and installation: (C) exhaust camshaft sprocket (B) intake camshaft sprocket-3.8L Engine
Install the right timing chain tensioner arm. Torque the retaining bolts to 14-17 ft. lbs.
Install the right timing chain auto tensioner. Torque the retaining bolts to 7-9 ft. lbs.
Install the right cam to cam guide and torque the retaining bolts to 7-9 ft. lbs.
Install the oil pump chain guide. Torque the retaining bolts to 7-9 ft. lbs.
Install the oil pump tensioner assembly. Torque the retaining bolts to 7-9 ft. lbs.
Pull out the pins on both the left and right hydraulic tensioners. Install the oil pump chain cover.
Rotate the crankshaft two revolutions in the clockwise direction. Confirm the timing mark. Be sure to rotate the crankshaft in the clockwise direction.
Apply sealant on the chain cover and on the cylinder head, cylinder block, and lower oil pan. Be sure these parts are free of engine oil and dirt.
Before assembling the timing chain cover, the liquid sealant TB1217H should be applied on the gap between the cylinder head and block. The part must be assembled with five minutes after the sealant is applied.
Fig. Sealant application (1 inch bead width)-3.8L Engine
Apply sealant on the chain cover.
The liquid sealant TB1217H should be applied on the gap between the cylinder head and block. The part must be assembled with five minutes after the sealant is applied.
Fig. Timing cover sealant application-3.8L Engine
Install a new gasket to the timing case cover.
It is important that the dowel pins on the cylinder block and holes on the timing chain cover should be used as a reference in order to assemble the timing chain cover in the correct position.
Remove the timing chain front cover, as outlined earlier in this section.
Rotate the crankshaft clockwise, as viewed from the front of engine/normal rotation, until the camshaft sprocket timing dowel pin holes line up with the holes in the timing chain housing. The crankshaft sprocket keyway should point upwards and line up with the centerline of the cylinder bores. This is the "timed'' position.
Fig. 8: The chain must be in the "timed'' position - 2.3L and 2.4L engines
Fig. 9: Remove the timing chain guides
Remove the timing chain guides.
Raise and safely support the vehicle.
Make sure all of the slack in the timing chain is above the tensioner assembly, then remove the tensioner. The timing chain must be disengaged from any wear grooves in the tensioner shoe in order to remove the shoe. Slide a suitable prytool under the timing chain while pulling the shoe outward.
WARNING Do NOT attempt to pry the socket off the camshaft or damage to the sprocket or chain housing could occur.
If difficulty is encountered in removing the chain tensioner shoe, remove the intake camshaft sprocket, as follows;
Carefully lower the vehicle.
Hold the intake camshaft sprocket with a suitable tool and remove the sprocket bolt and washer.
Remove the washer from the bolt and rethread the bolt back into the camshaft by hand. The bolt provides a surface to push against.
Remove the camshaft sprocket using a three-jaw puller in the three relief holes in the sprocket.
Unfasten the tensioner assembly retaining bolts, then remove the tensioner.
NOTE: The timing chain and crankshaft sprocket MUST be marked before removal. If the chain or sprocket is installed with the wear pattern in the opposite direction, noise and increased wear may occur.
Mark the crankshaft sprocket and timing chain outer surface for reassembly, then remove the chain.
Clean the old sealant off the bolt with a wire brush. Clean the threaded hole in the camshaft with a round nylon brush. Inspect the parts for wear and replace as necessary. Note that some scoring of the chain shoe and guides is normal.
To install:WARNING Failure to follow this procedure may result in severe engine damage.
Position the intake camshaft sprocket onto the camshaft with the surface marked during removal showing.
Install the intake camshaft sprocket retaining bolt and washer, tighten to 52 ft. lbs. (70 Nm) while holding the sprocket with a suitable tool. Use GM sealant 12345493 or equivalent on the camshaft sprocket bolt.
Place GM tool J 36008, or equivalent camshaft aligning pins, through the holes in the camshaft sprockets into the holes in the timing chain housing. This positions the cams for correct timing.
If the camshafts are out of position and must be rotated more than 1?8 turn in order to install the alignment dowel pins, proceed as follows:
The crankshaft MUST be rotate 90°clockwise off of TDC in order to five the valves adequate clearance to open.
Once the camshafts are in position and the dowels installed, rotate the crankshaft counter clockwise back to TDC.
WARNING Do not rotate the crankshaft clockwise to TDC; valve or piston damage could result.
NOTE: The side of the timing chain that was marked during removal must be showing when the chain is installed.
Place the timing chain over the exhaust camshaft sprockets, around the idler sprocket and around the camshaft sprocket.
Set the camshafts at the timed position and install the timing chain. Remove the alignment dowel pin from the intake camshaft. Using GM tool J 39579, rotate the intake camshaft sprocket counter clockwise enough to slide the timing chain over the intake camshaft sprocket. Release the camshaft sprocket wrench (J 39579 or equivalent). The length of the chain between the two camshaft sprockets will tighten. If properly timed, the intake camshaft alignment dowel pin should slide in easily. If the dowel pin does not fully index, the camshafts are NOT timed correctly and the procedure must be repeated.
Leave the alignment dowel pins installed. Raise and safely support the vehicle.
With the slack removed from the chain between the intake camshaft sprocket and the crankshaft sprocket, the timing marks on the crankshaft and cylinder block should be aligned. If the marks are not aligned, move the chain one tooth forward or rearward, remove the slack and recheck the marks.
Fig. 10: Timing chain assembly retaining bolts - 2.3L and 2.4L engines
Reload the timing chain tensioner assembly to its "zero'' position as follows:
Form a keeper from a piece of heavy gauge wire, as shown in the accompanying figure.
Apply slight force on the tensioner blade to compress the plunger.
Insert a small prytool into the reset access hole, and pry the ratchet pawl away from the ratchet teeth while forcing the plunger completely in the hole.
Install the keeper between the access hole and the blade.
Fig. 11: Reloading the tensioner to its "ZERO'' position, then install to the chain housing
Install the tensioner assembly to the timing chain housing. Recheck the plunger assembly installation, it is correctly installed when the long end is toward the crankshaft. Install the tensioner retaining bolts; tighten to 89 inch lbs. (10 Nm).
Carefully lower the vehicle enough to reach and remove the alignment dowel pins.
WARNING Severe engine damage could result if the engine is not properly timed.
Rotate the crankshaft clockwise (normal rotation) two full rotations. Align the crankshaft keyway with the mark on the cylinder block and reinstall the alignment dowel pins. The pins will slide in easily if the engine is correctly timed.
Install the timing chain guides, then install the front (timing chain) cover.
Need to Know what SIZE Engine to give this Internal Technical Info to you. Externaly The Crank Sensor picks it up from Harmonic Ballancer and so there are NO EXTERNAL Marks Nor Does the Manufacturer Provide this Info
There is a 2.4L DOHC Engine and there is a PROCEDURE Rather than MARKS on the 2.4L and Requires you to Fallow EACH STEP EXACTLY and in a Very Long Texting . But On the> 3.4L Engine and INTERNALY on the 3.4L the Marks Alighn With #1 @ TDC CAM Mark is STRAIGHT DOWN and the CRANK MARK is SRTAIGHT UP < This is Internal marks on the 3.4L Engine
GM does not provide timing chain timing marks, or information to perform timing chain service without the special tools shown in the timing chain service procedure
Well I just looked up the specs for you for the 2.7 ltr. I hope this is what you want.
Cam Caps 105 in.lbs.
Cam Sprocket 250 in.lbs.
Crank Dampener 125 ft.lbs.
Cylinder Head Cover 105 in.lbs.
Here is an illustration of the timing chain set up. Be aware these marks are lined up with the three sets of plated links on the chain. You should easily identify them if you have a new chain. You may have to clean an old chain to see them.
Good luck with this and let me know how it goes for you.
Here is All Lititure But Pictures Wont show up on FixYa for some reason, I can Email it ALL to you Just Send Me A Request to my Nickname here @aol.com
SPECIAL TOOLS REQUIRED (or equivalents)
J-36008, Camshaft sprocket timing alignment pins.
J-39579, Camshaft sprocket wrench.
The timing chain on the 1996 LD9 (VIN T) Twin Cam Engine is not to be replaced with the timing chain from any other model year. The timing sprockets are different on the Twin Cam Engine and the shape of the links matches the sprockets. Engine damage may result if the wrong timing chain is used.
The timing chain and crankshaft sprocket MUST be marked so that they are reinstalled with the same side facing out at the time of reassembly.
Failure to follow the removal and installation procedures could result in severe engine damage.
Ensure slack in timing chain is above tensioner assembly, then remove chain tensioner. The timing chain must be disengaged from grooves in tensioner shoe to permit removal of shoe. Position a suitable screwdriver under timing chain while pulling shoe outward. If difficulty is encountered in removing tensioner shoe, proceed as follows:
Lower vehicle, then while holding the intake camshaft sprocket with J-39579, remove sprocket bolt and washer.
Remove washer, then install bolt into camshaft by hand.
Position a suitable three jaw puller into intake camshaft sprocket relief holes and remove sprocket. CAUTION: Do NOT pry on camshaft sprocket as damage to sprocket or timing chain housing may result.
Tensioner assembly attaching bolts and tensioner assembly.
MARK CRANKSHAFT SPROCKET AND TIMING CHAIN outer surface for reassembly.
INSTALL OR CONNECT
Intake camshaft sprocket onto camshaft with surface marked during removal showing.
Intake camshaft sprocket retaining bolt and washer, torque to 70 Nm (52 ft lbs) while holding the sprocket with J-39579 (if removed).
Timing pins, J-36008, through holes in camshaft sprockets into holes in timing chain housing to position camshafts for proper timing. If camshafts are out of position and must be rotated more that 1/8 turn to insert timing pins:
Crankshaft MUST be rotated 90°clockwise off of TDC in order to give the valves adequate clearance to open.
Once the camshafts are in position and the timing pins have been installed rotate crankshaft COUNTERCLOCKWISE to TDC. CAUTION: Do NOT rotate the crankshaft clockwise to TDC, valve or piston damage could occur.
Timing chain over exhaust camshaft sprocket, around idler sprocket and around crankshaft sprocket.
Set camshaft sprockets at timed position and install timing chain. Remove timing pin from intake camshaft. Using J-39579, rotate the intake camshaft sprocket counterclockwise until timing chain can be installed over sprocket. Release J-39579 after timing chain has been installed over sprocket. The length of chain between intake and exhaust camshaft sprockets should tighten. The timing pin should easily fit through intake camshaft sprocket timing hole into timing chain housing timing hole. If timing pin does not fully index, the camshafts are NOT timed correctly and the procedure MUST be repeated.
With timing pins installed, raise and support vehicle.
With slack removed from timing chain between intake camshaft sprocket and crankshaft sprocket, timing marks on crankshaft and engine block should be aligned. If the marks are not aligned, move timing chain one tooth forward or rearward to align marks. Remove slack and recheck marks.
Reload tensioner assembly to zero position as follows:
Form a keeper out of heavy gauge wire into a U-shaped piece with a half inch opening.
Apply slight force on tensioner blade to compress plunger.
Insert small screwdriver into reset access hole and pry rachet pawl away from ratchet teeth while forcing the plunger completely in the hole.
Install keeper between access hole and blade.
Tensioner assembly to chain housing and recheck plunger assembly installation, noting long end is toward crankshaft.
Lower vehicle to point where timing pins can be removed from camshaft sprockets.
Rotate crankshaft two revolutions in the clockwise direction. Align crankshaft keyway with the mark on cylinder block and reinstall timing pins through camshaft sprockets into housing timing holes. Timing pins should slide easily through timing holes. If timing pins cannot be inserted easily, repeat procedure to properly time engine. CAUTION: If the engine is not correctly timed, severe engine damage could occur.