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Sorry for the delay. I am personally going back to answer your unanswered question. I do not know if you still need the answer, but I am going to answer it in case you still do.
Click on the following direct Link. It has the Timing Belt/MARK(S) Diagrams that you will need.
It is possible you are looking at the page for the 1994 960 and not the 940. The 960 had one (serpentine) belt. Your 940 has three. Hopefully chiltons has the repair order for the 940s as well.
TAKE FRONT COVER OFF(AFTER REMOVING FAN, BELT S, PULLEY AND FAN SHROUD).THEN REMOVE CRANK SHAFT PULLEY. WHEN COVER IS REMOVED YOU'LL SEE 3 SPROKETS, SUGGEST TO BRING CRANK TO TOP DEAD CENTER UNTIL YOU SEE ALL 3 MARKS FOR THE TIMING BELT. REMOVE BELT/INSTALL NEW AND REVERSE PROCEDURE.
I hope you've solved the problem by now, but there are alignment marks on the crank shaft (top pulley), idler (lower side), and cam shaft (smaller, bottom pulley) which should be aligned with stationary marks on the timing belt rear cover.
The belt has marks that align with the aforementioned marks (lines). The double marks on the belt align with the camshaft marks and the single marks with the others.
Loosen the tensioner clamp (nut) to allow the spring loaded tensioner to press on the belt and retighten the nut.
Rotate the crank shaft (clockwise, probably two revolutions) and make sure the pulley marks realign to the marks on the cover (they don't have to realign with the marks on the belt).
Rotate the crank shaft a full revolution once the belt is on and check that alignment is preserved.
Periodically loosen and retension the tensioner nut (access through a hole in the cover) to ensure that tension is maintained as the belt relaxes.
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