Question about GMC Sierra 2500

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How do I find top dead center on a 1999 gmc 5.7

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Remove #1 spark plug. Stick your finger in the hole. Have someone tap the key until you feel a noticable burst of pressure. Check the timing mark on the damper to make sure it's at zero. Stick a coat hanger into the spark plug hole & move the engine by hand using the crank pulley, until the hanger tops out. This is top dead center.

Posted on Jun 22, 2009

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Pull plugs so motor rolls easy find #1 hole put finger over hole where plug went roll motor with ratchet on cranhshaft when you start to feel air is coming to top dead center look on crank there should be alignment marks crank till they align thats tdc!!!GOOD LUCK!!!

Posted on Jun 22, 2009

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On the first cylinder (first closes one of right side). After plug is removed, turn motor until piston is at very top of cylinder.

Posted on Jun 22, 2009

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1 Answer

How to get number 1 cylinder top dead center when motor is not running on a gmc 4.3 1991


With truck off, you can turn the crankshaft nut from bottom of engine. To bring to top dead center. Remove #1 plug and insert a straw or similar into plug hole on top of piston. When the piston just starts to go back down from all the way up, that's top dead center, The number one cylinder in the 4.3 V-6 is the front wire on the driver-side of the engine. God-Bless!

Mar 03, 2015 | 1991 GMC C1500

1 Answer

Timing for a 1985 GMC 454 engine


timing is always before top dead centre . Check the specifics but generally 10-15 degrees bftdc

Mar 28, 2014 | 1985 GMC C2500

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Can not get the timing set on 1998 GMC Jimmy 4.3 4x4


oh boy . here we go. this is the hardest timing to set. first lets do it the easy way. pull off the valve cover on the drivers side. why do it. well there is a exhaust top dead center and intake top dead center. on the harmonic balancer has two marks. you want the second make. when you are turning the motor by hand watch the marks and watch to see when the intake valve is at the top.now when you put the distributor in the number 6 on the distributor will be at where the number 1 spark plug ,but the rotor will be pointed between 1 and 5. i have done so many head gaskets on these motor. I have pictures I am going to find and help you

Dec 28, 2012 | 1998 GMC Jimmy

1 Answer

What is the btdc


It refers to the mark on the crankshaft pulley that has the letters TDC (TOP DEAD CENTER), BTDC stands for "BEFORE TOP DEAD CENTER", that is the position of the #1 piston in cylinder just before it reaches the top of it travel on the power stroke measured in degrees of travel on the crank pulley.

Jun 25, 2012 | GMC G3500 Cars & Trucks

1 Answer

Firing order on distributor


Did you pull the distributor out ? Is it a v-8.. If so rotate your engine and bring #1 cylinder up to top dead center. Pull the distributor off and see if the rotor is over the top of #1 plug wire. It should be on top or straight across to the opposite side which is 180 degrees out. Firing order is 1-8-4-3-6-5-7-2.

Sep 02, 2010 | 1991 GMC Safari

2 Answers

How do you set the timing on a 1998 GMC Sierra?


The timing is not adjustable and it is computer controlled, but the distributor must still be clocked in properly and static timed, and here is how it is done.

There is a mark or notch on the distributor housing that the rotor should be pointing to when the engine is on top dead center. This static timing is all that matters and the computer will be able to control the timing as long as the ignition rotor is in that position when the engine is at top dead center.

1. Place the engine at top dead center.

2. Look under the distributor cap and find where the number one terminal runs under the distributor cap, and where that position on the distributor cap corresponds with the distributor housing, and it should match up to a mark or a notch on the distributor housing.

3. With the engine on top dead center the ignition rotor should be pointing to the mark or notch that is on the distributor housing, if it is not then loosen up the distributor and turn the distributor until the ignition rotor is pointing to the mark or notch on the distributor housing, the engine should now be static timed.

Jun 12, 2010 | 1998 GMC Sierra

3 Answers

Need diagram for firing order for 1996 gmc suburban 350 engine w/air


when viewing from the front of the engine, cylinders on the passenger side are 2-4-6-8, drivers side are 1-3-5-7. from the same view, the distributer is, stating at the tower at the 5 o'clock position, 1-8-4-3-6-5-7-2

May 11, 2010 | 1996 GMC Suburban

1 Answer

Need specks for timing a 1989 gmc 2500 v 6


need engine size 5.0/5.7.6.4 with or without deistributor without dist it is automatic with could be anywhere between 3-12*BTDC (before Top dead center)

Jan 21, 2010 | 1989 GMC Sierra

1 Answer

Timing is off


make sure its on the compression stroke tdc and there should be a mark on the dist.
using a scanner is probably the best way.

Apr 10, 2009 | 1999 GMC Suburban

1 Answer

GM 305ci. No start


Make sure you have number one cylinder at top dead center, do this by removing the spark plug and puttin a screw driver in it, when it gets to the top stop, you turn the motor by using a socket on the crank shaft, if you do not get the cylinder to top dead center this will cause the problem, how ever this means you have to remove the chain again and realign every thing.

Nov 22, 2008 | 1991 GMC K1500

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