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[TheBoy]

all engines use the same belt as far as I know.. and if markings correctly positioned , they come to correct position after 2 turns..
 
ps: Fit the cambelt so that the DOUBLE white line is aligned to the crankshaft
notch at 6.0 clock

nope

yep.. old age .. this is the correct sentence
tensioner set to the top quadrant should come down to the centre mark once the crank is turned 2 revs..

nope

[cem_devecioglu]

all engines use the same belt as far as I know.. and if markings correctly positioned , they come to correct position after 2 turns..
 
ps: Fit the cambelt so that the DOUBLE white line is aligned to the crankshaft
notch at 6.0 clock

nope

yep.. old age .. this is the correct sentence
tensioner set to the top quadrant should come down to the centre mark once the crank is turned 2 revs..

nope

nope. this is correct its from the notes of a vx factory worker. and I have experienced it..  not that much alzheimer

[Entwood]

all engines use the same belt as far as I know.. and if markings correctly positioned , they come to correct position after 2 turns..
 
ps: Fit the cambelt so that the DOUBLE white line is aligned to the crankshaft
notch at 6.0 clock

nope

yep.. old age .. this is the correct sentence
tensioner set to the top quadrant should come down to the centre mark once the crank is turned 2 revs..

nope

nope. this is correct

I don't know how many V6 omega cam belts you've ACTUALLY changed, but I can assure you that once the crank is rotated the lines mean nothing, the only way is to use the correct timing kit.

There is a wealth of experience on this forum who have, between them done a few hundred belts... so why do you insist on arguing with folks just for the sake of it

It is becoming boring

[cem_devecioglu]

here are the notes

"I. You should have the sparkplugs fitted when you fit the belt otherwise you will not be able to set the tension correctly!!!!
2. The top roller you show with the grease leaking out of it - needs changing thats the fail mode - very rare to see a belt on the V6 go - its always the rollers first!!!
3. The proper tool set (kent moore) has a timing gauge that goes onto the cam gears to set them correctly
4. If you set the rollers up correctly - you get the timing set first time

Top roller - set to 12 o clock to put belt on then set to just before 9 oclock
bottom roller - set to 3 o clock to put belt on set to around 12 0 clock - nip up just as the cam gear starts to move.
tensioner set to the top quadrant (as in pic) should come down to the centre mark once the crank is turned 2 revs - over tension will reduce the life of the rollers!!!"

[TheBoy]

That last bit is misleading - it will eventually fall to the mid marker after a few hundred/thousand miles, but most certainly not after 2 turns.

[cem_devecioglu]

That last bit is misleading - it will eventually fall to the mid marker after a few hundred/thousand miles, but most certainly not after 2 turns.

I have seen that happen.. (tensioner marker positioning)

[dubiez]

Well, belt is on on and all the timing adjusted.
I must have done 20 cam revolutions and adjustments to get it right but I got there in the end   
Not having markings on the belt makes it a bit more tricky though, after I first fitted the belt, I starting rotating the crank and the belt jumped off it 
Cams did not move at all at that point so I was able to rotate the crank counter clockwise to come back to TDC (not sure you're supposed to do that but I'd done maybe 1/8th of a turn on the crank).
The other tricky bit is setting the timing with the rollers, you need a 30mm spanner and I didn't have one, I managed to get one from my local parts shop but they did not have one that was offset enough so it would fit snug onto the nut. It turned into a 2 man job, with one holding the spanner and the other torquing the centre bolt.

To settle the argument between cem and theboy, the tensioner does not come down to the centre mark after 2 crank revs, it comes back to exactly where it was set (top quadrant for a new belt).

I just need to finish the job now, change the cam cover gasket and put it all back together, turn the key and marvel at the fact I have saved myself >£400, or cry as my engine explodes and I've wasted £150 and 2 days of my life 

[cem_devecioglu]

correctly setting the tensioner is not an easy job.. I have seen many mechanics fail in that resulting tensioner failure .. 

[05omegav6]

Well, belt is on on and all the timing adjusted.
I must have done 20 cam revolutions and adjustments to get it right but I got there in the end   
Not having markings on the belt makes it a bit more tricky though, after I first fitted the belt, I starting rotating the crank and the belt jumped off it 
Cams did not move at all at that point so I was able to rotate the crank counter clockwise to come back to TDC (not sure you're supposed to do that but I'd done maybe 1/8th of a turn on the crank).
The other tricky bit is setting the timing with the rollers, you need a 30mm spanner and I didn't have one, I managed to get one from my local parts shop but they did not have one that was offset enough so it would fit snug onto the nut. It turned into a 2 man job, with one holding the spanner and the other torquing the centre bolt.

To settle the argument between cem and theboy, the tensioner does not come down to the centre mark after 2 crank revs, it comes back to exactly where it was set (top quadrant for a new belt).

I just need to finish the job now, change the cam cover gasket and put it all back together, turn the key and marvel at the fact I have saved myself >£400, or cry as my engine explodes and I've wasted £150 and 2 days of my life 

Sounds like you've got there in the end

My first attempt was as traumatic, but the issues are forgotten when you first fire it up

[al brown]

Had a nightmare the first time it changed my cam belt (before I knew about oof). When I set the timing marks the marks on the belt where all lined up on the cams too. Imagine my dismay and panic when I rotated the engine after fitting the new belt to find the belts marks a few teeth out!!!  After removing checking and refitting a few times the internet was consulted, which is when I found oof. I remember then saying why on earth put marks on the belt, I know I was unlucky that when I took mine apart the marks just happened to be lined up, but they really didn't help.

[dbug]

Well, belt is on on and all the timing adjusted.
I must have done 20 cam revolutions and adjustments to get it right but I got there in the end   
Not having markings on the belt makes it a bit more tricky though, after I first fitted the belt, I starting rotating the crank and the belt jumped off it 
Cams did not move at all at that point so I was able to rotate the crank counter clockwise to come back to TDC (not sure you're supposed to do that but I'd done maybe 1/8th of a turn on the crank).
The other tricky bit is setting the timing with the rollers, you need a 30mm spanner and I didn't have one, I managed to get one from my local parts shop but they did not have one that was offset enough so it would fit snug onto the nut. It turned into a 2 man job, with one holding the spanner and the other torquing the centre bolt.

To settle the argument between cem and theboy, the tensioner does not come down to the centre mark after 2 crank revs, it comes back to exactly where it was set (top quadrant for a new belt).

I just need to finish the job now, change the cam cover gasket and put it all back together, turn the key and marvel at the fact I have saved myself >£400, or cry as my engine explodes and I've wasted £150 and 2 days of my life 

Done a few V6 cambelt kits now and agree that if tensioner set as recommended (top quadrant), it stays there even if crank rotated quite a few times (had one where setting timing took a while!)
Also confirm that I checked one that I'd done around 20K later (needed to change water pump so took the opportunity whilst stripped), and timing was still spot on and tensioner mark was at centre

[Entwood]

Tensioner mark and marks on belts are two totally different aspects that have no relevance to each other whatsoever... other than being on the same engine

Apples and bananas ..  both live in a fruit bowl but look and taste totally different ...

[slowboy]

changed mine last year belt had two sets of white marks and two sets of yellow .followed all instructions ziif.in the end used the crank and com markes .it workes

[dubiez]

All back together now.
It took quite a while, I took the opportunity to repair all the fixings that were broken by Halfords when they changed the radiator 6 months ago 
The engine sounds a bit rough at idle on the side of cams 3 and 4 (valve like sound), that clears up when revving up. Clackety sound comes comes back as soon as idling back.
Any idea what it could be?

[Andy B]

.....
 Clackety sound comes comes back as soon as idling back.
Any idea what it could be?

Sticking hydraulic lifters.

you could try something like http://www.ebay.co.uk/itm/Wynns-Hydraulic-Valve-lifter-Treatment-Petrol-and-Diesel-325ml-/181164281684?pt=UK_Vehicle_Oils_Lubricants_Fluids&hash=item2a2e3b8f54