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Author Topic: Cam Belt Change  (Read 3554 times)

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ScottieMV6

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Cam Belt Change
« on: 11 January 2009, 17:10:44 »
Ok. So I have now got to the point where I am ready to rotate the engine, however the belt looks extremely slack on the upper idler.

Is this ok?? Don't want to rotate without checking. :y
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JamesV6CDX

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Re: Cam Belt Change
« Reply #1 on: 11 January 2009, 17:17:15 »
What position is the arrow in mate?

Got a pic? :y
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ScottieMV6

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Re: Cam Belt Change
« Reply #2 on: 11 January 2009, 18:08:45 »
Arrow in 12 o'clock position as per dvd.

Bit dark for a pic but I can take one tomorrow.
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JamesV6CDX

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Re: Cam Belt Change
« Reply #3 on: 11 January 2009, 18:23:00 »
try turning it anticclockwise a bit until it takes up the slack...
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jonathanh

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Re: Cam Belt Change
« Reply #4 on: 11 January 2009, 18:26:13 »
doesn't sound right to me.  when you rotate, that slack will be taken up by the adjuster.  If there is loads, the adjuster will back off and the belt will jump.  You should actually have a pretty taught belt because you should have roatated the upper idler to align 1/2 with the timing guage.  Can you take the slack up with the adjuster?  if not then it sounds like you are a tooth out
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Marks DTM Calib

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Re: Cam Belt Change
« Reply #5 on: 11 January 2009, 19:28:41 »
There is a little slack between 1-2 and 3-4 bank.....when rotating the crank this will be very quickly taken up.....

If you get to much belt between the banks then you wont get the tensioner fitted and tensioned assuming the belt was put on with the cam locks fitted
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ScottieMV6

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Re: Cam Belt Change
« Reply #6 on: 11 January 2009, 20:31:43 »
The belt was fitted with cam locks in place.

I couldn't get the lower idler in once I had routed the belt so removed the upper idler, removed the belt from cams 3 and 4 while I got the lower idler in, then refitted the belt around 3 and 4 and then put the upper idler back.

Could this have affected it? I didn't see how as you have to set the upper idler to the 12 o'clock position afterwards anyway!
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ScottieMV6

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Re: Cam Belt Change
« Reply #7 on: 12 January 2009, 09:46:24 »
Ok here is the photo I have just taken. Hopefully you can make out the amount of slack. I can move the upper idler by hand very easily.

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Marks DTM Calib

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Re: Cam Belt Change
« Reply #8 on: 12 January 2009, 09:50:37 »
Ok....set the tensioner (set it high) and crank it voer, I suspect it will then adjust up fine!

It certainly wont damage anything.
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ScottieMV6

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Re: Cam Belt Change
« Reply #9 on: 12 January 2009, 09:52:35 »
Tensioner already set to the upper edge as advised in the DVD. Do I set it higher than that or should I rotate as it is?
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Marks DTM Calib

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Re: Cam Belt Change
« Reply #10 on: 12 January 2009, 09:54:47 »
Quote
Tensioner already set to the upper edge as advised in the DVD. Do I set it higher than that or should I rotate as it is?

In this case, set it 5mm higher.

I suspect that the slack is about half a tooths worth and is to be expected with the idlers in the pre-set state
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ScottieMV6

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Re: Cam Belt Change
« Reply #11 on: 12 January 2009, 09:57:33 »
Ok sorry for all the questions but I don't want to mess this up.

Once I have rotated and set the timing should I then set the tensioner back to the upper edge?
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Marks DTM Calib

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Re: Cam Belt Change
« Reply #12 on: 12 January 2009, 10:12:30 »
Quote
Ok sorry for all the questions but I don't want to mess this up.

Once I have rotated and set the timing should I then set the tensioner back to the upper edge?


Yes.

What we are doing is ensuring the tensioner can take up the excess slack for this initial stage  :y
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ScottieMV6

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Re: Cam Belt Change
« Reply #13 on: 12 January 2009, 14:28:07 »
Ok adjusted the tensioner as described and when I went to rotate 3 and 4 moved but 1 and 2 didn't move.

HELP!!!!!!!!!!
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ians

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Re: Cam Belt Change
« Reply #14 on: 12 January 2009, 15:04:44 »
Did the belt slip or what? or did you only move it a fraction?
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