Question about 1997 GMC Sierra K2500

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How to set timing on a 1997 v6 4.3l gmc vortec engine need to know specs. I am installing a new motor in the truck.

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  • Master
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On the drives side long the fire wall on the harness, will be one wire from all the other ones, it could be brown or tan, disconnect the that wire, start engine and set timing, turn engine off reconnect wire and check timing again, should be advance now, also some times that will cause an engine light to come on, just disconnect battery for 15 sec. and computer is reset.

Posted on Jul 09, 2010

  • twrench Sep 15, 2010

    The above method will only work on the older 4.3 vortecs, the 97 4.3 will have to be set with a scan tool and set at or – 2 degrees of zero. You can not set them with a light. You can get them to run by setting them by hand and then the computer will take over. This method will get it running long enough to get you somewhere and have it set with a scan tool if you don’t have access to one. Don’t leave it that way though. get it checked and set correctly to keep the mil light off and engine and computer happy.
    There is mention of it in the vortec thread on helpwrench.com
    http://helpwrench.com/forums/showthread....

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SOURCE: Torque Specs for Head Bolts on 1997 GMC Sierra V8 5.0 Vortec?

.0L Torque Specs Belhousing to engine bolts 28-38 ft/lbs Camshaft sprocket bolt 40-45 ft/lbs Camshaft thrust plate to engine block bolts 108-144 in/lbs Crankshaft pulley to vibration damper bolts 35-50 ft/lbs Cylinder head bolts -1979-1992 --Step 1 55-65 ft/lbs --Step 2 65-72 ft/lbs -1993-up --Step 1 25-35 ft/lbs --Step 2 45-55 ft/lbs --Step 3 75-85 ft/lbs Differential shaft lock bolt 15-30 ft/lbs Driveshaft U-joint to pinion flange bolts 70-95 ft/lbs Exhaust manifold bolts 26-32 ft/lbs Flywheel mounting bolts 75-85 ft/lbs Front engine mount nuts 72-98 ft/lbs Intake manifold to head bolts --Step 1 96 in/lbs --Step 2 16ft/lbs --Step 3 23-25 ft/lbs Intake manifold (upper intake to lower) 12-18 ft/lbs Oil filter insert to engine block adapter bolt 20-30 ft/lbs Oil pan mounting bolts -1979 --Step 1 (Large bolts) 11-13 ft/lbs --Step 1 (Short bolts) 7-9 ft/lbs --Step 2 (Large Bolts) 15-17 ft/lbs --Step 2 (Short Bolts) 10-12 ft/lbs -1980 to 1987 9-11 ft/lbs -1988 to 1993 6-9 ft/lbs -1994-up 110-144 in/lbs Oil pickup tube to main bearing cap nut 22-32 ft/lbs Oil pickup tube to oil pump bolts -1979 to 1987 10-15 ft/lbs -1988-up 12-18 ft/lbs Oil pump mounting bolts 22-32 ft/lbs Pinion bearing preload 8-14 in/lbs Pressure plate to flywheel bolts 12-24 ft/lbs Rocker arm fulcrm bolts 18-25 ft/lbs Spark plugs 7-14 ft/lbs Timing chain cover bolts 12-18 ft/lbs Vibration damper to crackshaft bolt 110-130 ft/lbs Wheel lug nuts 85-105 ft/lbs

Posted on Mar 16, 2010

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