![]() ![]() That allows the timing mark on the flywheel time to move into the 0-5-10 window and lets you read the mark in that window. When you dial in, say, 25 degrees of dialback, it looks at the rpm, figures out how long 25 degrees of crank rotation is going to take, then delays the flash that long after it detects spark. It is watching the RPM and a microprocessor is calculating how much time each degree of engine movement is going to take at that RPM. The other is to employ a dialback timing gun like you have. You can just aim the gun at it and read the sticker directly, with the gun set at 0. ![]() The sticker has marks on it up to about 50 degrees. It's a sticker that is indexed to the circumference of your harmonic balancer (this doesn't necessarily apply to the Fiat SOHC). Since the marks only show 0, 5 and 10, you can't really see the mark at full advance (say, around 3500 rpm). Timing Get yourself a timing light, short terminals Te1 to E1 this retards the advance, hook up your light, make sure the pickup is on the 1 Cylinder, then run engine untill completely warmed up, turn off and grab a 12mm box end and loosen the distributor securing bolt just enough so you can move the dist, but leave enough tension so it doesnt. The reason for the dialback function is to be able to test your timing higher up in the RPM range, where the advance is greater. If you dial in 10 degrees on the gun, then you should see the mark on the flywheel move close to the 0 degree mark on the bellhousing window. Using the timing light, you want to line up the degree marks (16 or 12) with the indicator on the timing cover. Under the hood there should be a label that gives you the timing requirements. So if you set the gun to 0, which means "no dialback", in other words the light is going to flash as soon as spark is detected, then you should see the mark on the flywheel somewhere close to the 10 degree mark on the bellhousing window. First, loosen the three small bolts around the distributor cap in case you end up having to retard or advance the timing. Follow the instructions particular to the timing light youre using to hook it up properly. I think that's the way the flywheel marks are on the SOHC. Hook your timing gun up to the power and ground terminals on your cars battery, and hook the sensor that accompanies the timing gun to your number one cylinder spark plug wire. You will need a timing light with the adjustment knob or a balancer with timing tape to see 40 degrees. You may need to re-curve the advance mechanism to get both the 10 to 12 initial and 38 to 40 total. 60° advance dial makes it easier to read and adjust timing advance Trigger activated Clamp-on inductive. The timing light features an LED indicator light to insure proper hookup as well as a rubber nose to protect the unit from damage. Some engines mark 0 (tdc), 5 (btdc) and 10 (btdc) degrees. Ideal initial timing for a stock to mild cam is 10 to 12 (without vacuum advance connected). The trigger-activated timing light’s 60 degree advance dial makes it easy to read and adjust timing advance. But there are generally more than one mark on the engine. The vacuum advance is used to aid part-throttle, light-load driveability, and fuel mileage. ![]()
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