Timing marks on the 4.9L can be confusing - I've marked the correct ones in white (green fingers) on mine so they show up easily under a timing light. Those indicated by red fingers should be ignored.
IF THE IMAGE IS TOO SMALL, click it.
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V8s are set up opposite, with numbers on the balancer, and a pointer on the engine.
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Always follow the instructions on the VECI label. Note that the correct timing setting has the large notch (10°BTDC) on the stamped steel scale.
To check if the harmonic balancer outer ring (with the timing mark) has slipped on the rubber isolator, remove the #1 spark plug (V8 RHF) and rotate the crankshaft until the pointer aligns with 0. Use a hose to blow into the spark plug hole - if it's easy, and you hear the air coming out the throttle body, rotate the crank 1 full rev back to 0, and recheck. If it's difficult (#1 compression stroke), and ALL the air comes out around the threads, drop a plastic drinking straw into the hole so it rests on the piston and rock the crankshaft gently to make sure you have the piston EXACTLY at top dead-center (straw as high as possible). Then re-check the pointer. If it's slightly off, adjust it so it's dead-on 0. If it's WAY off, replace the balancer.
![timing49.jpg Timing marks on the 4.9L can be confusing - I've marked the correct ones in white (green fingers) on mine so they show up easily under a timing light. Those indicated by red fingers should be ignored.
IF THE IMAGE IS TOO SMALL, click it.
[url=https://www.supermotors.net/registry/media/762729][img]https://www.supermotors.net/getfile/762729/thumbnail/firingorderi6.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/1127070][img]https://www.supermotors.net/getfile/1127070/thumbnail/95f49oilk.jpg[/img][/url]
V8s are set up opposite, with numbers on the balancer, and a pointer on the engine.
[url=https://www.supermotors.net/registry/media/470416][img]https://www.supermotors.net/getfile/470416/thumbnail/sparkwireroute94up_5l.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/1055019][img]https://www.supermotors.net/getfile/1055019/thumbnail/05gray46.jpg[/img][/url]
Always follow the instructions on the VECI label. Note that the correct timing setting has the large notch (10°BTDC) on the stamped steel scale.
To check if the harmonic balancer outer ring (with the timing mark) has slipped on the rubber isolator, remove the #1 spark plug (V8 RHF) and rotate the crankshaft until the pointer aligns with 0. Use a hose to blow into the spark plug hole - if it's easy, and you hear the air coming out the throttle body, rotate the crank 1 full rev back to 0, and recheck. If it's difficult (#1 compression stroke), and ALL the air comes out around the threads, drop a plastic drinking straw into the hole so it rests on the piston and rock the crankshaft gently to make sure you have the piston EXACTLY at top dead-center (straw as high as possible). Then re-check the pointer. If it's slightly off, adjust it so it's dead-on 0. If it's WAY off, replace the balancer.
[url=https://www.supermotors.net/registry/media/1127636][img]https://www.supermotors.net/getfile/1127636/thumbnail/distholddown.jpg[/img][/url]](https://www.supermotors.net/getfile/965006/fullsize/timing49.jpg)