71 LA 340 timings moved!! how?? looking for help
What have you actually DONE, besides play with the timing? I outlined how to check timing marks which in my head is absolutely essential
in addtion, "there is" some possibility that the cam drive has slipped. If you read through some of the factory service manuals, there is a procedure in there to check that. Otherwise, simply "wrench" the engine back and forth and "feel" for the play in the timing chain while watching the distributor rotor. The object is to estimate how far the crank moves (linear measurement or degrees rotation) before the rotor moves. When you do this a few times, "back and forth" you can "feel" where the chain takes up slack
A backfire can be several things, including timing, an open plug wire or other high voltage "open," a valve hanging open or burned, or even just no/ poor shot from the carburetor accelerator pump
Download service manuals:
Free service manuals
and
MyMopar - Mopar Forums & Information - MyMopar Tools/Reference
I could SWEAR I posted this, I've done so "so many" times. CHECK THE TIMING MARKS!!! for accuracy. You need a piston stop. I made this one and have had it since the early 70's
You can buy them online, make certain you figure a way to lock the plunger so it does not move.
Unhook the battery for safety. Remove no1 plug, make sure the piston is "down a ways." Install the stop device, and "wrench" the engine around until the rotation stops on the device. Make an accurate temporary mark onto the balancer, under the TDC mark on the timing tab.
Rotate the engine opposite direction until it again stops, and make a second temporary mark under the timing tab. Now you have two marks, and true TDC will be halfway in between. If the original mark is accurate, that is where it will be
READ THIS ARTICLE, it has been posted here many many times...........post 4 of this thread. I would have posted this directly, l but the "new improved" software on this site sucks so bad I am not going to spend the time arguing with it
Ignition timing chart
What have you actually DONE, besides play with the timing? I outlined how to check timing marks which in my head is absolutely essential
in addtion, "there is" some possibility that the cam drive has slipped. If you read through some of the factory service manuals, there is a procedure in there to check that. Otherwise, simply "wrench" the engine back and forth and "feel" for the play in the timing chain while watching the distributor rotor. The object is to estimate how far the crank moves (linear measurement or degrees rotation) before the rotor moves. When you do this a few times, "back and forth" you can "feel" where the chain takes up slack
A backfire can be several things, including timing, an open plug wire or other high voltage "open," a valve hanging open or burned, or even just no/ poor shot from the carburetor accelerator pump
Download service manuals:
Free service manuals
and
MyMopar - Mopar Forums & Information - MyMopar Tools/Reference
I could SWEAR I posted this, I've done so "so many" times. CHECK THE TIMING MARKS!!! for accuracy. You need a piston stop. I made this one and have had it since the early 70's
You can buy them online, make certain you figure a way to lock the plunger so it does not move.
Unhook the battery for safety. Remove no1 plug, make sure the piston is "down a ways." Install the stop device, and "wrench" the engine around until the rotation stops on the device. Make an accurate temporary mark onto the balancer, under the TDC mark on the timing tab.
Rotate the engine opposite direction until it again stops, and make a second temporary mark under the timing tab. Now you have two marks, and true TDC will be halfway in between. If the original mark is accurate, that is where it will be
READ THIS ARTICLE, it has been posted here many many times...........post 4 of this thread. I would have posted this directly, l but the "new improved" software on this site sucks so bad I am not going to spend the time arguing with it
Ignition timing chart