I like to see my engines run before I button everything up. If you can run the engine for even a few seconds with the timing cover off, you'll have confidence in your work as you're putting everything together. This will be with no water pump, alternator, power steering pump, and given enough time, oil spraying around.
After you do enough of these, you become confident, and even complacent, and tend to stop paying such close attention to detail. That's when things go wrong and you have to take things apart again. The good news here is you don't have a lot of new technology to make this a confusing job. This is just a basic 318 c.I. With two cylinders lopped off. 318s never had the fiber tensioner on the side of the chain. Regardless, you're still looking for the same thing. Rotate the crankshaft by hand with a socket and ratchet two times, then recheck the timing marks. That's clockwise as you're sitting in front and looking at the front of the engine. If you're ever confused on another engine, just look at where the crank sprocket is pulling the timing chain tight, (right side in this case). When you're turning it the right way, all of the slack in the chain or belt ends up on the side with the tensioning device.
For future reference, while the 318 is not an "interference" engine, it's still good practice to rotate the crankshaft twice by hand, not with the starter motor. I can share that some of the Neon engines are interference engines. If the timing belt is off by just one tooth, the Engine Computer will see that, turn on the Check Engine light, and set the diagnostic fault code, "cam and crank sync". At two teeth off, the computer will shut the engine down to protect the valves. At three or more teeth off, the open valves will hit the tops of the pistons when they reach TDC. The valves will be bent, requiring a lot more work. My reason for sharing this is many people try to cut corners and don't replace the hydraulic and spring-loaded belt tensioners when replacing the timing belt. Improper installation procedures also can lead to the belt being off by three or more teeth. If you use the starter to try to start the engine in that state, it's strong enough to bend the valves, then a head gasket and valve job are required. If you were to rotate the crankshaft by hand first, you'll feel it come to a sudden, solid stop when the pistons hit the valves. You can't bend the valves by hand. That tells you the job has to be rechecked. But no damage was done.
Friday, April 15th, 2022 AT 4:52 PM