General Timing

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General Timing

bellini006

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Hi there wonder if anyone can help me out with little problem please. I rebuilt my punto gt turbo, got it all back together and running ?, but runs very lumpy. Wen I put the belt back on I put the pulley 's on the marks I made (belt loose) wen I tighten the belt the cam pulley moves anti clockwise 1 tooth but crank stays same, so I compensated for it by taking the belt off turning the pulley 1 tooth clockwise past my mark putting, belt on, tightening it and marks line up. Should I of left it the first time? Can anyone help please thanks.
 
If the marks you made before doing the job line up then the timing should be fine and you need to look elsewhere I'm afraid.
 
Hi there wonder if anyone can help me out with little problem please. I rebuilt my punto gt turbo, got it all back together and running ��, but runs very lumpy. Wen I put the belt back on I put the pulley 's on the marks I made (belt loose) wen I tighten the belt the cam pulley moves anti clockwise 1 tooth but crank stays same, so I compensated for it by taking the belt off turning the pulley 1 tooth clockwise past my mark putting, belt on, tightening it and marks line up. Should I of left it the first time? Can anyone help please thanks.

Presumably this is the same procedure for the later mk2b's? If you are worried you have totally messed it up you can check your method with a 10mm allen key in the exhaust cam locking tool access point and two lengths of metal/wood marked with tape - at the same point relative to one set of rod ends - so that when the pistons are almost at the same height the tape is almost level near the top of the cam housing so you can easily see the relative differences of the rods - if the marks on the rods are much higher than the top of the cam housing (the reference point) it is very hard to see if they are level..
 
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So the pulleys moving when you tension the belt is because you have to put it on as tight as you can with the slack bit ending up the right place... But below is how i timed up a GT last time i did it...


If not out already remove cylinder 1s spark plug, or all of them to make turning the engine over by hand easier.


Set the bottom end to TDC:

ON the engine block is a casting mark in the shape of a point, it is at 12o'clock as you look at the end of the crank. Line up the keyway nodge on the end of the crank to this cast mark as shown in this pic
time2.jpg


larger pic
time3.jpg


Using a small screw driver, make sure the engine is at TDC by feeling for a piston in chamber1, if you feel no piston rotate the crank another 360degrees, and feel again.

When the bottom end is set to TDC, rotate the camshaft until it reaches this point below.
time1.jpg


There is a small notch in the camshaft pulley, it is on the outside (visible side) and on the inside (against the plastic cowling). Line this notch up with the nodge on the timing belt cover when the viewing window is fully open. You can see the nodge directly above the belt on the photo above, also shown below
time4.jpg


Now carefully apply the belt around the camshaft pulley, then the oil pump drive pulley, the crankshaft pulley and then the belt tensioner. Try to leave as little slack between the camshaft pulley and oil pump pulley as possible because when you take the slack of the belt up with the tensioner you dont want this to pull the belt and turn either of the two main pulleys out of time.

The amount of slack you leave on the belt is a matter of opinion, on the longest run between the top pulley and oilpump pulley i leave enough belt to almost put a step with my fingers, hard to explain, best to discuss this with someone who has done one in person.


After you timed the crank and camshaft together remove the phase sensor, below:
time6.jpg


line up the small notch in the wheel inside the phase sensor by rotating the shaft until it lines up with the larger line in the view glass as shown below
time5.jpg



Now place the phase sensor carefully back, being careful not to rotate the phase sensor, best to take your time and keep trying until you get it spot on, tighten the securing bolt and voila.
 
Thanks so much blu73 very very helpful. Much appreciated
 
blu73;4037697 larger pic [ATTACH said:
150981[/ATTACH]


Using a small screw driver, make sure the engine is at TDC by feeling for a piston in chamber1, if you feel no piston rotate the crank another 360degrees, and feel again.:confused::confused::confused::confused::confused:

360 surely you mean 180..:confused::confused:

When the bottom end is set to TDC, rotate the camshaft until it reaches this point below.


as 360 would be back where you started..,
Charlie
 
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