Jump to content
  • Welcome to 205GTIDrivers.com!

    Hello dear visitor! Feel free to browse but we invite you to register completely free of charge in order to enjoy the full functionality of the website.

Sign in to follow this  
davemar

Mi16 Cambelt Tension And Alignment

Recommended Posts

davemar

After far too many years I've decided to give the car a cambelt change. The old one looked very good considering its been on there 8 years, but don't want to take risks.

 

Anyway, currently trying to fit the new one and am not convinced I've got it on correctly. The cams and crank seem to be lined up correctly using the pins, but the tension of the belt doesn't feel right on the top run between the two camshaft spockets. It feels very loose, but I can't pull it any tighter as it's not quite a whole tooth stretch to do this.

 

I suppose a good way of knowing whether I've got the belt on correctly is counting the teeth on the run between the two cam sockets. Would anyone know how many teeth I would expect to have if counting between the 12 o'clock position on each sprocket (assuming the engine in a vertical, not the normal tilted, position)?

 

 

Share this post


Link to post
Share on other sites
welshpug

use pins, can't get it wrong then.

Share this post


Link to post
Share on other sites
DamirGTI

Feed the belt on the exhaust pulley first , then make it snug as you can on the inlet pulley ie. between the two , then round the front tensioner , crank sprocket , water pump and finally rear tensioner (obviously lock the cam pulley's before doing so) .. the idea is that you route the belt in such way so that the greatest slack on the belt is arranged round the tensioners .. then up the tension on the front one a bit then the rear remove locking pins and spin the engine few revolutions by hand and re-check the timing and adjust the tensioners some more or less as needed .

 

D

Share this post


Link to post
Share on other sites
davemar

I'm sure I've done it properly now. I think the problem was the sprockets want to spring away from the right place with the pins in ever so slightly, making it tricky to get the belt on correctly. All seems lined up and tensioned well now. :)

Share this post


Link to post
Share on other sites
davemar

Finally got round to getting the engine started again after the cambelt change. The engine sounds and revs nicely, but there's a high pitched whistle now. It does sound like it's from the cambelt end of things but difficult to pinpoint. I've removed the cover just in case it was a rubbing sound, but it is still there. Anyone else experienced this?

Share this post


Link to post
Share on other sites
welshpug

belt too tight probably.

Share this post


Link to post
Share on other sites
davemar

I've tweaked the tension a couple of times now and there's still the sound. I'm not 100% convinced it is the cambelt area that's making the noise, it's very hard to pinpoint the location of it. Could there be anything else that makes the noise?

 

I've removed the fanbelt to eliminate that from the test.

Share this post


Link to post
Share on other sites
jackherer

Does it get worse as the engine warms up?

Share this post


Link to post
Share on other sites
davemar

Haven't run long enough to get properly warm. I think I've narrowed it down after bodging together a stethoscope from a hose pipe and funnel. It seems to be coming from where the inlet manifold attaches to the head, so is probably a tiny air leak causing a whistle.

Edited by davemar

Share this post


Link to post
Share on other sites
davemar

Refitting the inlet manifold after giving the surfaces a wipe down. The sound has now gone, so that fixed it! :)

  • Like 1

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×