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Hi,
I don’t know how you are counting the teeth on the belts but I doubt the belts themselves vary with numbers of the teeth all that much.
Every belt I have ever used went on without any problems and have 123 teeth in total.
The total length of the belt is actually almost considered irrelevant as long as the tooth spacing and its form matches as the tooth pitch on the sprockets.
That thing could go out and around out the fenders as long as it’s taut between the three sprockets, on the pulled side and the marks line up.
Nothing is going to get out of time unless the belt is NOT taut!
That’s why there is an adjustment service interval required!
When an engine stops, the Pistons can actually equalize themselves in the cylinders, due to compression build up and can back up slightly.
If the belt gets too loose that’s when the belt can jump a tooth or a rapid acceleration or stall out can move it more than one tooth!
It’s very important to reset the tension during every other 7,500 mile oil change. It only takes a moment!
You really don’t need any marks on the belt as long as you keep the marks in place, when the right side taut between the sprockets on either side of the distributor sprocket. That it the timing part!
Counting Line to Line, of which, is the top of each tooth “on the belt” is how it works for only the belt!
The sprockets count on the bottom of a tooth root where it’s suppose to go.
You only start out counting over from dot on any LENGTH between either of the sprockets to one!
You cannot count both dots.
If you cross from the top to a bottom engagement system, it won’t come out right.
Otherwise you end up one tooth off!
44 teeth on the upper length spacing and 27 on the bottom. That is what I count with those lines drawn on the belt.
That leaves 52 on the backside to go back to the top of which is “all” tensioner location take up.
Nobody wants to count, but the snafu is, the crankshaft sprocket does not get wrapped with the belt upon installation.
The last tooth engages over, if you use lines, to mark bottom.
You have to imagine that belts teeth laying over to the bottom of the tooth that will line up to the marked tooth.
Remember you can only count one mark on either end of a set length.
So the last line, is up on the left, about three teeth high, if I remember correctly.
I know that sounds odd but the crankshaft has to divide equally into diameters to get a TWO
to ONE ratio up top. Those other things travel at half speed on four stroke engines and all that sounds even!
Well!
Luckily the crankshaft rotates the belt around at about six times slower than the engines RPMs
I’m saying the belt itself slowly rotates it’s length around and around within a 360 degree circle.
This is why after you rotate the engine, to double check your marks for synchronization, those painted lines on the belt never line up again unless you turn the engine over and over several, several times!
I’m suspicious that its about three degrees of rotation with each trip around on that 123 tooth belt.
With a longer, out to the fenders belt, it would even take longer!
What’s nice is this helps to rotate the wear around the belt, ever so slightly so it never stays in one place over and over. Like it could…(:)
Yeah right, now I bet that plays with one’s mind!
So it shows that only “one side” of the belts location is doing the timing of anything and it’s a round thing and there are no “sides” except the inside and outside? (:) Do edges count? (:)
So please don’t count those teeth anymore or you could go blind! Adjust the belt regularly and call it good!
Also, for better maintenance practices, don’t ignore the cleaning of the teeth in your head, as they will skip out and go away too! (:)
Phil
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