vaccum timing advance

cool thank you i will try it tommorow . now i just have to check my fsm and find what its supposed to read

 

i believe i have a 225 with the prestolite dist. my book tells me it should be 0* unlike the delco which is 5* atdc

 

ok i will double check tommorow thank you for the info

 

Another thing that can happen is the outer ring on the harmonic balancer can slip on the rubber hub it's mounted to. When it does that your timing mark will be off as well.

 

well so the only real way to tell the timing is to put it at top dead center then?

oh and today i took what i think is the anti back fire off the jeep...( bad idea ) and it made it worse so i put it back on and still driving with the choke on. that new dist. needs to get here asap lol

 

Once it's at TDC, you can check the timing tab and the balancer to ensure they line up. If it's good, then you don't have to worry about it.

 

Any time you adjust the points it is mostly likely you have changed the timing. Always check the timing after any point breaker adjustment.

 

ok so my delco dist should be here today. now when i change this can i just pull the old one and put this one in? or do i have to have it at tdc? any special info anyone can tell me, this will be my first time changing a whole dist.

 

Your instructions on the HEI install will probably tell you to set engine at TDC with nr#1 on compression before removing old distributor. Now if it don't you need to do it anyway. Makes thing so much simpler and easier. Locate nr#1 spark plug wire where it goes into existing cap. Mark the dist housing at this tower. Remove the dist cap. A socket and breaker bar on the crank bolt to slowly rotate the engine until the rotor points to the mark previously made on the dist housing. Observe the crank pulley and TDC are aligned. The dist rotor should be lined up with the mark you made on the housing. Note the alignment and direction the rotor is in relation to an engine component. This will help later. Have your new dist handy when you pull your old one. Set the new dist rotor the same as the old one for nr#1 tower and don't let it move. When you pull the old dist, slide it out slowly and you will notice the rotor moving backwards slowly. It will eventually stop moving. Notice how far backwards it has moved. Now rotate the rotor back the same distance the old one moved and insert the dist. It may not drop all the way down into the oil pump shaft so you will have to rotate the engine 2 turns to get the dist rotor to come back around to nr#1 on compression. Note the timing marks should be back in alignment. Be sure to hold some down pressure on the distributor while rotating the engine so it will drop all the way down into the pump shaft slot. Tighten dist so that you can still move it with resistance and go through your timing proceedure.

 

thank you very much that will be very helpful... already got the wrong cap from advanced auto good thing carquest actually had it here in the warehouse

 

and its not the hei dist its just the delco point dist ....i imagine its the same .. probably should have jsut sprung fot the hei, but next summer. right now i just want to get it running right, as it isnt rite now.

 

i have another question about timing. i didnt get the chance to change the dist this weekend cause i had my daughter. but my question is if the tdc on the exhaust stroke would the rotor be pointing at the oposite post like mine


number one plug should be the opposite that the rotor is now. im just wondering if this is possible, or does the rotor land on #1 each time comp. and exh. ?

 

guess im just :dead horse:..........

 

Yes, the rotor turns half the revolutions of crankshaft, IE: 2 to1 .

 

ok good thank you for the info puting the new dist in tommorow at work. i was just out there this afternoon, and decided to look at the rotor positon when the timing mark was at 0*. thank you again

 

FINALLY i changed my dist today at work. jeep definetly runs alot better i still have a hesitation. im thinking now its the carb. but definetly its a step forward. thank you everyone for your info it was a great help. :driving:

 

good to hear. A hesitation off idle, or at any rpm?

 

i think it is more off idle. it runs great if i run the choke with it. but if i just run it at idle and i press the gas to rev the engine it hesitates bad, unless i hit the pedal a few time in a row, to almost build up the speed to rev the engine.. im leaning toward the carb any suggestions?