Ensure Cam sprockets are aligned.



Ensure Crank Pulley is aligned to the TDC Peg.



Ensure Auxilary Pulley Pointer is central to the Half Circle.



It all should like this.



Belt tensioner


Belt tension

 

just to add, as a rule of thumb, in the longest run of belt.. there should be just enough tension in it to be able to twist the belt through roughly 90 degrees. as a final check wind the engine round twice on the bottom bulley with the plus out and check the alignment of all the above points again

 

Don't you have to feed the belt round the pulleys anticlockwise too ? Starting at the crankshaft ?

Cosrush, these are superb pictures, about time we got something better than ford's low res diagrams
You might just have saved a few peeps some valves, etc...

 

Edited to say that if the above is wrong I will take it out before someone gets in trouble on my account

 

Thanks

I took them before i dismantled mine, and thought others could benefit from them...

 

By the way...

Those pictures were taken in my old kitchen where i dismantled it

My wife didn't mind though

 

and if u notice , ever so slightly the left hand cam pulley is just out of plonk a smidgin - this is what justifies the need to vernier timing pulleys, if you are running a wild cam and it was out by that very small amount , you could end up with bent valves. on a std engine with std cams the EXACT mechanical timing is not quite so crutial.

 

i have a couple of points toadd, based on experience.

1) the crank pulley should be lined up so that the leading edge of the square peg is in line with the blade of the timing marker, rather than the centre of it as pictured (according to the YB service manual).

2) tensioner. the manual says to tension the belt by turning the tensioner clockwise and locking it. if you do this, the belt is trying to turn the tensioner anticlockwise which has a loosening action against the locknut. i had this happen that the locknut loosened and the cambelt loosened and jumped and fucked all 16 valves.

if you tension the belt by rotating the tensioner anti-clockwise, the belt pushes against it and keeps it tight against the locknut.

 

i've re-read the manual, and point 1 is described as the 'flank of the tooth', whatever that means.

 

from doing a google, the 'flank of the tooth' would seem to be the leading edge, rather than the flat top.

 

is this the same for a greentop 4x4 saff engine then (200 block) ?

 

Couple of points to add:

1) Trailing edge is the correct TDC point.

2) The tensioner MUST be done clockwise to centralise the belt in the runners.

 

Ive edited these pictures a little.
Hope this is an improvement, and clears up any ambiguity

***these have now been amended at the top of tis post***

 

and if you try to tension it anticlockwise, the belt rubs on the thermostat housing

 

Nice edited pics.. very clear indeed

 

Would anyone mind if I add my two pence worth?

Don't assume that if the Aux Drive pulley is aligned as shown that the dizzy will be aligned correctly - Take the dizzy cap and shield off, put the rotor back on and align the centre of the rotor contact with the mark on the rim of the dizzy

Neil.

 

i don't understand what you mean Stu. Do you mean where the belt comes out of the front cover near the crankshaft pulley?

i've got my tensioner done up anticlockwise, and the belt does not contact either the front cover or anywhere near the thermostat housing. but you've got me worried now. but i really don't want to change it as to me it's risky when it's clockwise and trying to undo it's locknut. i know that's how ford and cosworth say it should be done and that's how thousands are running.

CosRush, great pics. has clarified the crankshaft tooth position brilliantly as well.

 

Personally, I too agree with your reasoning, and I deliberately tried to tension mine anticlockwise when I last changed the belt, to see how it would fit, and the belt rubbed firmly on the thermostat housing flange/bolt in that position... (mine is 4x4 if it makes a difference to the thermo housing..)

 

Thanks for the comments on my pics....

If they help anybody then thats got to be good

 

yes it does rich, well they're different parts anyway, so they could well be differently shaped in that area.

 

For anyone on verniers tha arent clear on where the pulleys should line up or might have been apart and put back wrong, the woodruff key is opposite the triangle, so starting point should be the two woodruff keys facing away from each other (ie the opposite way to the triangles, so facing apart not facing together)

 

Great thread

I am tackling my belt/tensioner this week

Thanks

 

good point

on kent verniers, the word 'cams' is in the position where the arrows would be,like this ( kinda hard to see sorry )



http://img.photobucket.com/albums/v2...s/IMG_3811.jpg