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Old 07-05-2008, 09:18 PM
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Chicago190 Chicago190 is offline
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How To: Check and Adjust Timing

For the future to save people an hour of learning, here is how to check and adjust the timing on Chevy 350 engines. Excuse my laymans descriptions, but it will show that it takes almost no mechanical ability to set the timing correctly.

Tools needed:
Basic Set of wrenches
Timing Light
White out/chalk for marking pulleys

Time: 30 mins. maximum

1. Disconnect lifting shocks on motor box to open it all the way.

2. Start engine and bring to operating temp. Turn off engine and look at the crank pulley (bottom most pulley with the raw water pump attached). Disconnect the safety lanyard and bump the motor over until you can see the timing marks on the pulley. There will be a line in the middle which is Top Dead Center (see picture).



3. Take white out/chalk and mark the pulley to make it easy to see the Top Dead Center mark when using your timing light.

4. Locate the bracket above the pulley that has the marks for setting the timing. It should have degree readings so you know which to mark. Use the white out/chalk again and mark 10 degrees Below Top Dead Center on the bracket. It will be obvious where to mark when you see it (see picture, yellow mark is 10 degrees BTDC).



5. The timing light will have 3 connectors. Connect the first two to the battery, and attach the third to the #1 spark plug wire. The #1 spark plug wire is at the front right.

6. To set the timing, the engine must be put into diagnostic mode. The easiest way to do this is take a paper clip and use it as a jumper to jump pins A and B of the data connector on the back of the engine. This connector is in the main wiring harness by itself and has a gray and black cover on it (see bad picture). The pins are marked so it will be easy to know where to put the paper clip. Stick one end of the paper clip in pin A and the other end in pin B. When you start the engine it should idle at 1000 RPMs.



7. Start the engine and then point the timing light at the crank pulley. If the timing is correct the markings will match up with each other.

8. If timing needs to be adjusted, loosen the bolt at the bottom of the distributor to allow the distributor to turn. If the timing is too advanced, turn the distributor counter clockwise and vice versa if the timing needs to be advanced. A little turn does a lot so make small changes.

9. Once the timing is set properly, retighten the bolt on the distributor to lock it in place.

10. Remove the paper clip and you're done.
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Last edited by Chicago190; 07-05-2008 at 09:21 PM.
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Old 07-08-2008, 11:39 PM
kah68 kah68 is offline
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Great post, thanks...does anyone have step by step for 351 Indmar/Holley timing?
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Old 07-09-2008, 01:20 PM
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omit step 6. It's pretty much the same.
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Old 07-09-2008, 01:28 PM
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Boat has a 351 but the truck has a 350 ! Subscribed!!
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Old 07-09-2008, 01:30 PM
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and set at idle, not 1000 rpm.
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Old 07-09-2008, 08:18 PM
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Chicago190 Chicago190 is offline
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Quote:
Originally Posted by kah68 View Post
Great post, thanks...does anyone have step by step for 351 Indmar/Holley timing?
I think the #1 spark plug is different on the Ford motors. I want to say front left spark plug, but do a google search to be sure.

As denverd1 said there won't be an electrical connector on the back to jump since its only for the fuel injected motors.
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Old 07-09-2008, 08:40 PM
TMCNo1 TMCNo1 is offline
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Quote:
Originally Posted by Chicago190 View Post
I think the #1 spark plug is different on the Ford motors. I want to say front left spark plug, but do a google search to be sure.

As denverd1 said there won't be an electrical connector on the back to jump since its only for the fuel injected motors.

#1 on the 351W is the first plug on the front of the head on the starboard/right side/driver side of the boat.
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Last edited by TMCNo1; 08-08-2008 at 09:59 PM.
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Old 07-09-2008, 09:15 PM
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Chicago190 Chicago190 is offline
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Just to clarify: when I refered to right and left its when looking at the front of the motor.

Chevy #1 spark plug is at the front of the motor on the port side of the boat/observer's side.

Ford #1 is at the front of the motor on the starboard/driver's side as TMCNo1 said.
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Old 07-10-2008, 10:06 AM
kah68 kah68 is offline
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Thanks guys I will set timing this weekend.

Kirk
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Old 07-10-2008, 10:56 AM
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You forgot to tell them to pull the trigger on the gun! Timing should be checked and adjusted if necessary after installing any EI kit. Shoot for about ~600 rpms at idle. This will drop to ~400 rpm at idle IN gear on the lake.
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