1995 GMC Jimmy Distributor Timing Reset

1995 GMC JIMMY
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UNCLESOAP04
  • MEMBER
  • 2 POSTS
I have a 1995 GMC Jimmy... and i replaced the head gasket... and i didnt put the distributor back in the same way i took it out and now i have to find out how to reset the distributor.. i was told that i have to put the number 1 cylinder to top dead center and then set the rotor between the number 1 and number 6 spark plug on the cap.... is that how its done?? because ive been trying to find out how to fix it for like 3 weeks now and its getting frustrating... :D Can you please help me????? im desperate!! thanks again.. chris[/b]
May 5, 2006 at 9:09 AM
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LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
1.Remove no 1 plug. Rotae engine until compression hits. Put a long screwdriver in the hole and rock the engine until u feel the piston at TDC (timing mark on 0).

2.Note #1 spark plug location on the distributer cap

3.The distributer gears are angled so start the distributer back in the hole about 30 degrees left of the rotor.

4.When it drops it will not go all the way because the oil pump shaft needs to be seated. Rotate the engine until the distributer seats all the way.

5.Repeat #1 and check #2. If isn't quite on number one do it again as you might be a tooth off. When you have it right go to step 6

6. replace spark pulg and distributer cap, diisconnect timing spout.

7. start engine and set to specs. Turn off and reconnect spout. It should run fine

8, Good luck
May 6, 2006 at 6:45 AM
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Suggested Repair

Remove the No. 1 spark plug and rotate the engine on the compression stroke until the piston is at TDC with the timing mark at 0. Note the No. 1 terminal on the distributor cap, then install the distributor so the rotor ends up pointing at that terminal, allowing for the angled drive gear. If the distributor does not seat fully, rotate the engine until the oil-pump shaft engages, then recheck TDC and rotor position and correct it if it is a tooth off. Reinstall the plug and cap, disconnect the timing spout, start the engine, set timing to specification, shut it off, and reconnect the spout.

Conversation Summary

The owner of a 1995 GMC Jimmy replaced the head gasket and reinstalled the distributor incorrectly, so the engine timing needs to be reset. An expert explained how to find No. 1 TDC on the compression stroke, align the rotor with the No. 1 cap terminal, seat the distributor on the oil-pump shaft, and set base timing with the spout disconnected before reconnecting it.

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