Re-timing 1.9 8v

[sport1901966 8]

Hi all,

 

I'm fairly new to the 1.9 gti engine and as a learning opportunity I bought one already out of the car. I plan to gradually re-build it but have no definite plans so far.

 

Basically the current issue is the cambelt tensioner was loose and at some point the timing has gone well out.

 

Is there anyway to re-time the camshaft to the crank as it is and if so how?

 

Sorry if there is something obvious I'm missing but as I say I am fairly inexperienced in this sense.

 

Thanks,

 

Geoff

[Anthony 1,003]

There's a timing hole on both the cam pulley (around 8 o'clock looking side on) and one on the crank pulley (about 11 o'clock looking side on) - line both of these up, refit the cambelt and tension as normal.

[sport1901966 8]

This is what I thought but when I did this and turned over by hand it would get to a point and i would feel resistance and it wouldnt turn any further. I was assumung it was contact between valve and piston?..

[Rom 0]

It could just be compression, try taking the plugs out, see if its will turn over then.

Its normal that its hard to turn over at certain pints on the cycle, but obviously if its lockign there is a problem.

 

Was it running before this ? If so it wont be vavle contact unless it jumped, but youd have known about that

[Tom Fenton 1,542]

If you don't already have one a Haynes manual will be a good investment for you.

[djinuk 2]

just a thought it might be 360 deg out on bottom pulley, although if this is the case i dont think that you holes will line up perfectly, what i learnt was not to use random bolts etc to line up the holes, but instead get some perfect pins (bolts) that are 10mm, to ensure the timing is spot on.

 

to do a timing belt spot on you should time up using the pins, slacken the top cam so its jst resting on the top bolt, slide the belt on top and bottom and run the through the tensinoer (which should be slackened), , then finger tighten the top cam bolt, then release the tensioner, , then you tighten up the top cam bolt.

 

This is how i was taught to do it, and it works spot on and means the cambelt isnt so hard to get on, i was told reason for not tightening the top cam bolt before releasing the tensioner, was that the tensioner can knock the timing out, or even cause the belt to jump.

Edited May 1, 2008 by djinuk

[2-Pugs 57]

just a thought it might be 360 deg out on bottom pulley,

 

how does that work then? If the crank has gone round 360' then surely it's back where it started, and it is once again correct?

 

Surely, if you can get both crank and cam timing dowels in, it must be correct? .

 

But I am willing to be proved wrong, preferably on this board, not my engine

[ablister 31]

just a thought it might be 360 deg out on bottom pulley, although if this is the case i dont think that you holes will line up perfectly, what i learnt was not to use random bolts etc to line up the holes, but instead get some perfect pins (bolts) that are 10mm, to ensure the timing is spot on.

 

 

2-pugs is right, 360 degree turn is back to the same position.

 

Edited May 1, 2008 by ablister

[djinuk 2]

sorry , my mistake i meant 360 on the top cam, (hence it would be 180 degree on the bottom) but like you say if the dowels line up then all should be good

[Tom Fenton 1,542]

sorry , my mistake i meant 360 on the top cam, (hence it would be 180 degree on the bottom)

 

The camshaft turns at half engine (crank) angle, therefore if the camshaft rotates 360 degrees the crank will have rotated 720 degrees.

[djinuk 2]

ill shut up and go play gta4 ,

[sport1901966 8]

Cheers for all the replies guys, the compression would be the obvious answer lol. But yea a haynes is soon on the way as well.

 

Thanks again

[Grim.Badger 15]

ill shut up and go play gta4 ,

 

I don't know if you are getting confused but I know 16v engines can be 180 degrees out on the cam(s); iirc it happens if you let the cams move independantly of each other and time them up again wrong so one will be starting closing the valves when it should be opening them Can't happen on the 8v as it only has one cam

[welshpug 1,657]

Cams move at half crank speed on the 8 and 16v engines. (21T crank to 42T cam IIRC)

 

did you get it timed back up?