Question about 1985 GMC C2500

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454 timing All I need to know is what the timing needs to be set at on my 454 engine and if it is before or after top dead center

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Http://www.ehow.com/how_7580123_set-timing-chevy-454.html
have a look to this link

hope it helps

Posted on Apr 07, 2014

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Posted on Jan 02, 2017

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SOURCE: 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.

Posted on Apr 19, 2009

techbuster
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SOURCE: 1993 gm 454 engine fan belt assembly

Go to www.autozone.com and click on repair info and enter in car info and then click on repair manuals and a manual for your vehicle will come up and it should be listed in that manual. Sometimes the diagram is on the hood of the vehichle rather than on the engine compartment but you probably already looked there... Hope this helps
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Posted on Jul 08, 2009

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When setting valve timing at what degrees crankshaft pulley mark be?


Finding TOP DEAD CENTER (TDC) Casually

mgaguru.com/mgtech/engine/cs111a.htm
Other times it needs to be a bit more accurate, like setting the crankshaft straight ... assembled engine, and you can use the timing mark on the crankshaft pulley to ... are 360 degrees apart, or offset by one complete rotation of the crankshaft. With TDC on the compression stroke the intake and exhaust valves are both closed.

Finding top dead center on No.1 cylinder when timing marks ...

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Feb 21, 2010 - The crankshaft on a 4 cycle motor in never 180 degrees off between ... Because of this; the timing mark on the crankshaft pulley will be in exactly the same ... So it isn't necessary to know that distinction when setting ignition timing. ... If the exhaust valve spring is about to become fully relaxed, while the ...

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How do i set timing chain on sprockets ,ie top dead centre.


I don't know what car you have, so here's what was needed on mine:
1. Bring engine to Top Dead Center, ready to fire #1. There should be a mark on the front pulley or on the flywheel. Move cams to the TDC mark, too. My car was twin cam, the front cams needed to face apart, and set the marks....

Yours may be different.

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Timing for a 1985 GMC 454 engine


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

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1 Answer

1992 Chevrolet Tahoe timing


timing on the chevy motors do not very much.
most of the older 350's timing are set about 8 deg before top dead center. some california smog certified 350 timing were set back to 0 deg or, at top dead center. check under the hood for a smog decal. it should have the timing specs, or it might say "timing not adjustable" or N/A. if it is missing the decal i would set it at 8 deg, road drive it, and listen for enging pinging on accelerating under load. if no ping i would leave it at 8 deg,if there is slight pinging i would ****** the timing in 2 deg increments until the pining stops. i would stop if i reach reach 0 deg or top dead center.

Sep 12, 2012 | Cars & Trucks

1 Answer

Rebuilt my 454 engine, installed distributor with rotor at 0 TDC on #1 cylinder. Engine ran fine but ses light was on. Code was P1345-- disagreement between cam sensor and crank sensor. Scanner showed...


The ignition timing is not adjusted with a timing light or with the engine running, and to set the ignition timing follow these procedures.

There is a mark or notch on the distributor housing that the rotor should be pointing to when the engine is on TDC. (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 TDC.

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 (usually has a #6 for 6 cylinder engines or a #8 for 8 cylinder engines) indicating the number one TDC alignment position.

3. With the engine on top dead center the ignition rotor should be pointing to the number one TDC alignment 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 and aligned with the TDC alignment mark or notch on the distributor housing and then tighten down the distributor, the engine should now be "Static" timed. (The more precise that you are aligning the TDC alignment mark with the ignition rotor the better the engine will run, and it will be less likely that there will be a camshaft to crankshaft correlation problem)

If the distributor can not be turned enough to align the ignition rotor with the number one TDC alignment mark on the distributor housing, or the distributor does not set properly and will not allow the installation of the spark plug wires then the distributor is not installed correctly and is most likely a tooth off and it will need to be re-installed correctly. (The distributor should set like it is shown in the firing order diagram when it is properly installed)

Here is a firing order diagram to also help assist you.




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1 Answer

Settings for points for 454 engine86 chev c30 scotsdale one ton truck


You have a 1986 454 engine with an old style breaker point ignition distributor, GM has not used a breaker point ignition for their V-8 engines since 1974, is that an older distributor or something after-market?

The ignition points dwell angle for that engine should be set at 29-31 degrees dwell (a dwell meter would be the most accurate way to set the ignition points), or a .019 in. point gap.

The spark plug gap for that engine would be .035 in. and the timing should be set at 10 degrees before top dead center.

Jun 29, 2010 | 1986 Chevrolet Chevy

2 Answers

IS SETTING THE TIMING AS SIMPLE AS GETTING THE TIMING MARKS LINED UP? IF SO I HAVE DONE SOMETHING WRONG ANY SUGGESTIONS WOULD BE APPRECIATED


You have to make sure the engine is at top dead center on number one cylinder (all valves closed on number one cylinder) - if distributor installed check that #1 is on firing position so is not on exhaust stroke and or remove spark plug and put plastic straw in hole to see if piston is at TDC (top dead center) ready to fire on compression stroke.
After setting timing always rotate engine 4 times to bring back to same location and that nothing like pistons bump into valves etc. and make sure that timing marks are at the location. If you install backwards on some engines the oil pump will not be in line to accept oil and will not get oil pressure - I believe this true of 3.1 chev or was it 3.8 I messed up on, lol

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1 Answer

How do I set the timing on a 93 Chevy truck with a 454, Also what should it be (dergees)


first you have to find you #1 spark plug, take this out and bring your piston to top dead center.the distributor should be facing the same .

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8 degrees before tdc

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Ignition timing should be set at 10 degrees BTDC (before top dead center), with vacuum advance hose disconnected and plugged, engine idling at 800 rpm or less.

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