K series VVC Cambelt change questions...

18 posts / 0 new
Last post
Peter G
Online
Last seen: 42 sec ago
Joined: 17/04/2014

Thanks for all the pointers everyone, belts all changed and all seems good, but before I fire it up, how is the tension on the manual belt tensioner set? The spring I have with it doesn’t seem to move the backing plate much and it’s leaving the belt loose in my view, any ideas?

SM25T
SM25T's picture
Offline
Last seen: 1 hour 26 min ago
Joined: 17/04/2014
Spring hooks on bolt you fit in hole above tensioner. With both tensioner bolts loose, it pulls the tensioner to the required level. However, I dont like/trust it either. I move the tensioner with a finger until long strand of belt feels right. Mid span, can't quite twist it to 90 degrees. Then torque up both bolts ... with a spot of loctite. Turn engine over 720 degrees with a ratchet on the crank bolt. Then check tension again. Do remove the spring and bolt.
Peter G
Online
Last seen: 42 sec ago
Joined: 17/04/2014

I ended up doing the first bit and it felt a bit tighter, and when it fired up the lower section of belt below the water pump was moving around quite a bit, I realise the longer length from the exhaust cam to the crank pulley is in tension, but I couldn’t see that with the bottom cover on. I’ll leave it for now it’s still worn till June 1st, so I’ll give it a gentle run and then have another look and if needs be put a bit more tension on it. Thanks Ian.

revilla
Online
Last seen: 2 min 24 sec ago
Joined: 17/04/2014
You'll find the belt on the VVC engine runs quite a bit looser than on other engines, this is to protect the front VVC mechanism main drive bearing. If you tension the belt as far as you would on other engines the bearing will wear prematurely. There is a different part number for the tensioner spring for a regular K and a VVC.

SV VVC 170 - 170.4 bhp @ 7100 rpm - 142.4 ft.lb. @ 4900 rpm

Peter G
Online
Last seen: 42 sec ago
Joined: 17/04/2014
Cheers Andrew. After I posted I went back out and i could see the spring working this time so left it as intended. It seemed to be sticking earlier so perhaps something was out of line. Thanks again.
SM25T
SM25T's picture
Offline
Last seen: 1 hour 26 min ago
Joined: 17/04/2014
You mean you slackened off the tensioner bolts this time :-)
Peter G
Online
Last seen: 42 sec ago
Joined: 17/04/2014
Dodgy eyesight probably.....