Why do you need to lock down the timing belt?
Even though belts will not last as long as a chain, they are quieter and often easier to line up correctly with the cam and crank locked down. Anytime the belt is removed, the cam and crank need to be aligned to TDC No.1, which is where the marks on the crankshaft pulley line up with the pointer on the front cover.
Do you have to be dead on with timing belt alignment?
Because modern vehicles use so many electronics to control the engine with things such as crank and camshaft timing sensors, technicians need to be, as we say in the industry, “dead-on” with the timing belt alignment. The cam gear cannot be off by even a tooth, or the engine will set a DTC.
How can I tell if my timing belt is bent?
You can tell if the valves are bent by trying to rotate the cams. If the valves are bent, they pull the closing rockers down and jam them against the cams, thereby stopping them. Simple check. I recall one 916 coming in that we fitted new belts too and away it went.
What can cause a tripped cam sensor code?
The most common cause of a tripped cam sensor code, according to a belt manufacturer, is the misalignment between the rear cam gear and timing belt. A DTC can be triggered with the cam gear being one tooth advanced or retarded.
Even though belts will not last as long as a chain, they are quieter and often easier to line up correctly with the cam and crank locked down. Anytime the belt is removed, the cam and crank need to be aligned to TDC No.1, which is where the marks on the crankshaft pulley line up with the pointer on the front cover.
Because modern vehicles use so many electronics to control the engine with things such as crank and camshaft timing sensors, technicians need to be, as we say in the industry, “dead-on” with the timing belt alignment. The cam gear cannot be off by even a tooth, or the engine will set a DTC.
How often do timing belts need to be replaced?
While timing belts have been steadily getting replaced by chains due to their longer service life, belt manufacturers have made strides to improve their belt life to more than 100,000 miles, in some cases. Even though belts will not last as long as a chain, they are quieter and often easier to line up correctly with the cam and crank locked down.
The most common cause of a tripped cam sensor code, according to a belt manufacturer, is the misalignment between the rear cam gear and timing belt. A DTC can be triggered with the cam gear being one tooth advanced or retarded.
How can I tell if my timing belt is right?
Another way you can check if you’re in the right ballpark is to remove the spark plug on the number 1 cylinder and put something long (screwdriver or socket extension) in the chamber and turn the crank pulley with the breaker bar and see where the top of the cylinder’s stroke is. Now that the cam and crank are timed correctly]
Can a camshaft be turned without a belt?
However, both camshafts need to be lined up with the timing marks as well as the crankshaft turned to TDC before you install the belt to keep everything lined up correctly. My belt guide also shows this not to be an interference engine, so the cam shafts and crankshafts can be turned independently without causing damage.
What is timing belt cam gear Dot and line alignment?
Timing Belt Cam Gear Dot and Line Alignment HELP! Ok, i’m really confused now. I have a 98 6spd 2JZGTE Engine, and when you align your timing belt, your factory cam gears has both a dots and a lines, and your factory crank pulley has both a white line and a yellow line.
Where are the lines on a cam belt?
The lines on cam gears are exactly 30 degrees from the dots and the grooves on the harmonic balancer are 60 degrees from each other, so as long as the first set of marks line up and the second marks line up as your turning the motor you have the belt on correctly.
How often do crankshafts need to be lined up?
The crankshaft turns two times for every one turn of the camshafts. However, both camshafts need to be lined up with the timing marks as well as the crankshaft turned to TDC before you install the belt to keep everything lined up correctly.
What to do when crankshaft wont turn with wrench to line?
You can get everything lined back up by setting the crank in a position where all the pistons are down. 90 degrees off of TDC works for this. If you can’t turn it in one direction try the other. Then and only then can you turn the camshaft to get it into timing position.
What happens if you try to turn a crankshaft while timing chain is off?
If you are trying to turn the crankshaft while the timing chain is off, you may have an open valve that is hitting a piston. This can be a big deal and you can damage the valve if you try too hard.