dave2 said: (quoted from post at 20:36:06 01/17/10) You could have it 180 off.... TDC lines up twice. Dave
WRONG When you line up the cam marks to the engine timing marks, that puts the cam in time.
IF the distributor gear is off, there may be an easy way to "fix" it without tearing it back down, here's how.
First MAKE SURE your crank/ cam marks are in fact correct.
Now remove (at least) the no 1 plug, and stick your finger in the hole. Gently bump the engine around watching for "the marks" As the marks come "up" toward TDC AND your finger gets forced out of the hole, THAT IS the correct stroke (No1 ready to fire)
Now just bump to get the marks anywhere from TDC to 10 BTC, and pull the cap. Wherever the rotor is pointing is where you want No1 wire. If it's off "a little" from any hole, you can diddle the distributor housing to compensate, you just don't want, say, the vacuum advance jammed up against something.
Now just re--install the wiring in relation to the "new" No1 and re--time the engine
The only reason on MOST engines that there is a "specified" plug tower for the no1 wire is
so the assembly line folks can "wrench repeat"
so the wires lay nice
so tune up mechanics "see what they expect"
There ARE a few engines that "matter." These are many V6's--remember "even" and "odd" fire engines: In them the plug towerrs, the pickup unit, or points cam are "paired" so that two cylinders fire close together, then a wide space, and then two more.
In this case you do NOT want the plug wires out just one hole. Someone recently mentioned on here that some Wisconsin (V4's?) have this problem
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