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slack on cam belt


 
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drew m
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Joined: 01 Oct 2016
Posts: 46
Location: falkirk

PostPosted: Sun May 19, 2019 9:38    Post subject: slack on cam belt Reply with quote

Hi,
Just done cam belt on my 1999 1kzte, gates belt and new ntn tensioner from roughtrax all went well with some reading on forum but seems as if there is excess slack in long part of belt opposite tensioner, starts to get tight when twisting belt to  90%, anybody else noticed this or am I being over careful.
Cheers Drew
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PostPosted: Sun May 19, 2019 9:38    Post subject: Google Ads keep this community free to join!


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Juddian
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Joined: 31 Jan 2015
Posts: 222
Location: Sunny Northamptonshire

PostPosted: Mon May 20, 2019 10:09    Post subject: Reply with quote

Being able to twist the longest run by 90' and not really any more was always the rule of thumb for cambelt changes when people used to service their own cars.

The tensioner spring is very very strong,  you wouldn't want such tension acting directly on the belt, hence the amount of leverage involved in the tensioner pivot action, if i recall i couldn't compress the old tensioner directly when i tried putting my entire weight on it.
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drew m
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Joined: 01 Oct 2016
Posts: 46
Location: falkirk

PostPosted: Mon May 20, 2019 20:35    Post subject: Reply with quote

Hi,
Thanks for the reply, on thinking about it more,t I turned the engine over with a socket and bar on the crank shaft and the belt tightened up immediately so I'm happier now, the crank maybe moves back a fraction when engine stops giving a bit less tension on the belt, my old tensioner was showing signs of weepage from the top so decided to change it.
Cheers Drew
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Roger Fairclough
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Joined: 24 Oct 2007
Posts: 1605
Location: Redditch Worcestershire

PostPosted: Tue May 21, 2019 9:56    Post subject: Reply with quote

The tensioner needs to be compressed in a vice and a steel pin inserted through holes to keep the tensioner set ready for fitting. You then turn the cam sprocket to tension the belt before pulling the pin out.

Roger
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drew m
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Joined: 01 Oct 2016
Posts: 46
Location: falkirk

PostPosted: Tue May 21, 2019 10:57    Post subject: Reply with quote

Hi guys.
Yeh I did all that except tension the belt by turning the cam sprocket, does the tensioner apply tension all the time if so it should be OK, I would think it has to apply tension all the time.
Cheers Drew
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Roger Fairclough
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Joined: 24 Oct 2007
Posts: 1605
Location: Redditch Worcestershire

PostPosted: Sun May 26, 2019 11:27    Post subject: Reply with quote

The idea of turning the cam sprocket anticlockwise is to remove the slack in the section of belt between the cam and driven sprockets. This will confirm whether or not the sprockets are lined up. Yes, the tensioner is always maintaining tension.

Roger
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