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Author Topic: Timing belt won't!  (Read 2397 times)

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chrisdb

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Timing belt won't!
« on: 18 February 2009, 16:42:16 »
I'm trying to set the timing after fitting a new belt kit. Before starting I line up the camshaft sprockets and fit the belt. Set the adjusters point up on the middle one and left on the right hand one. Set the tensioner and then rotate the engine through 720 degrees. When I check the timing marks, both banks have moved to the left by about just under half inch, and I just cannot bring bank 3/4 round any closer that about 4mm from the marks.

I had the same trouble for a while last year but got there in the end - can't remember how. Anyine know what I'm doing wrong?
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VX1

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Re: Timing belt won't!
« Reply #1 on: 18 February 2009, 16:58:47 »
Might be better if you use the cam locking tool for the cams, makes life easier.

Paul  :y
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Lizzie_Zoom

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Re: Timing belt won't!
« Reply #2 on: 18 February 2009, 17:21:30 »
Quote
Might be better if you use the cam locking tool for the cams, makes life easier.

Paul  :y

Indeed Paul, and the experts on here will tell you that you cannot properly set the cams without the locking kit! ::) ::) ::) ::)

So to avoid engine damage Chris I suggest you obtain a locking kit before you go any further! ;)
« Last Edit: 18 February 2009, 17:22:16 by Lizzie_Zoom »
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chrisdb

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Re: Timing belt won't!
« Reply #3 on: 18 February 2009, 17:27:02 »
Sorry, don't think I explained correctly. I am using the cam locking kit... no problem there... the problem happens when I remove the locks and rotate the engine - as you have to do - when I lock the crankshaft to check and ajust, the timing marks have moved - as expected, because you have to turn the pullies - with the 30mm crank spanner... i cannot bring the timing marks round to line up...

Not sure if I explained that any better either!
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HGV mechanic

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Re: Timing belt won't!
« Reply #4 on: 18 February 2009, 17:30:44 »
to me it sounds like you have not taken enought slack out when tensioning,  realign and re tension, hth :)
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ngrainqey

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Re: Timing belt won't!
« Reply #5 on: 18 February 2009, 18:17:39 »
are you talking about the timing marks on the actual pullies?
if you get the belt on so the slacks on mostly where the tensioner is and where the idlers are is as tight(as little slack as possible) as you can get it on then it should be within quarter of an inch when you turn the crank the 720 degrees :y
HTH
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chrisdb

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Re: Timing belt won't!
« Reply #6 on: 18 February 2009, 18:24:19 »
Thank for the advise. I've tried what HVG said but after rotating 720 degress banks 1&2 are almost spot on - banks 3&4 are about quaryet of an inch before the timing moarks. The only porblem is that turning the lower pulley does not advance the timing at all now... it just turns and does nothing.

I tried doing it the haynes way as oppsoed to the dvd way but that does not work for me either.

I get all of the slack out from the belt when fitting it but there are no marks on my belt to align with the scrokets - could I have it too tight? :-? Gonna start again doing it the dvd way :(
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Marks DTM Calib

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Re: Timing belt won't!
« Reply #7 on: 18 February 2009, 18:40:15 »
Right, the lower right pulley should be set to 3.00 and the upper to 12.00.........sounds like you are setting the lower right one WRONG and hence you have no adjustment available and the belt is going on a tooth out
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Chris_H

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Re: Timing belt won't!
« Reply #8 on: 18 February 2009, 19:30:29 »
As someone who just did his cambelt change 2 hrs ago (not fired it up yet!) I suspect the top tensioner needs dropping i.e. tightening.  That should pull 3 & 4 towards 1 & 2.
If it runs out of adjustment then you need to back it off fully, hop the belt back one tooth on the right bank and re-tension.
My 0.02GBP
Technical or what?
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chrisdb

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Re: Timing belt won't!
« Reply #9 on: 18 February 2009, 19:42:54 »
I've just set it up again and here are some photos of the current state so you can tell if I'm doing something wrong. I'm gonna have something to eat and then rotate the crank, after which, they will be about half inch out and I won't be able to  get any closer that a quarter inch... Moving the belt sounds good though... might just try that :)





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Chris_H

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Re: Timing belt won't!
« Reply #10 on: 18 February 2009, 19:46:54 »
Your top adjuster looks to be on minimum.  Have you set it?

If you pull it down 1/8 inch it should bring the right bank in by 1/4 inch.
You will have to re-set the spring-loaded tensioner though.
« Last Edit: 18 February 2009, 19:49:51 by ChrisH174 »
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chrisdb

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Re: Timing belt won't!
« Reply #11 on: 18 February 2009, 19:48:46 »
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Your top adjuster looks to be on minimum.  Have you set it?

Yes, I set it as Mark DTM said - top one at 12 o'clock, lower one to 3 o'clock...
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Marks DTM Calib

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Re: Timing belt won't!
« Reply #12 on: 18 February 2009, 19:49:25 »
The crank lock should be fitted for a start!

We dont know if the crank is at TDC!
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chrisdb

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Re: Timing belt won't!
« Reply #13 on: 18 February 2009, 19:52:56 »
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The crank lock should be fitted for a start!

We dont know if the crank is at TDC!

Oh, sorry, I had just removed it. I had it 60 btdc while I was setting the cams in place, then I put it on and locked it on tdc, and then removed it after I torqued the bolts - 40nm for the rollers and 20 for the tensioner nut. Incidently, the tensioner has always moved a long way out after turning the crank, even though tightened to 20nm...
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Chris_H

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Re: Timing belt won't!
« Reply #14 on: 18 February 2009, 19:53:52 »
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top one at 12 o'clock, lower one to 3 o'clock...
There's no point in an adjuster if you set it like that. :D
Put the locks back in and set it to take out the slack.
« Last Edit: 18 February 2009, 19:55:58 by ChrisH174 »
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