|
||
|
6th February 2020, 18:09 | #91 |
Loves to post
MG ZT-T 160 Join Date: Dec 2015
Location: Devon
Posts: 288
Thanks: 179
Thanked 70 Times in 53 Posts
|
|
6th February 2020, 18:10 | #92 |
Premium Trader
Rover 75 Join Date: Nov 2010
Location: Devon
Posts: 33,767
Thanks: 8,837
Thanked 14,831 Times in 8,030 Posts
|
Compressing the piston Jonty.
__________________
Lest we forget..
|
6th February 2020, 18:13 | #93 |
Loves to post
MG ZT-T 160 Join Date: Dec 2015
Location: Devon
Posts: 288
Thanks: 179
Thanked 70 Times in 53 Posts
|
|
7th February 2020, 07:44 | #94 | |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,372
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
|
Quote:
Simon
__________________
"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
|
7th February 2020, 18:52 | #95 | |
Loves to post
MG ZT-T 160 Join Date: Dec 2015
Location: Devon
Posts: 288
Thanks: 179
Thanked 70 Times in 53 Posts
|
Quote:
In fact I was last night envisaging lines on a photo of the front belt set up! I was looking at how different tensioner positions would yield different directions to the line of action through the tensioner set-up... and how that would affect the moment through the unit and thus force exerted on the piston once the pulley reaction was resolved in the direction of the piston. I think I would need to do more sketching and head scratching to work it all out. Getting in there would of course allow me to make adjustments and ascertain what the effect is. I have read that the likely optimum position of the eccentric mounting when initially setting the tension is with the hexagonal hole in the pulley (when viewed from the front) looks to be in a '4 o'clock' location. Perhaps when I get in there I can check that for a start. Not had a chance to look at the current position of the tensioner today...will try and pop out there in a bit. UPDATE - piston still in the extended position that I levered it to and has not retreated yet. Last time I ran the engine up to temperature and when fully cooled that was when it had retreated. I will run the engine tomorrow and see if I can assess the tension of the belt when cold with my little FACOM belt tension tool and when hot to make sure things aren't too tight in the belt train. Cheers, Jonty Last edited by drjonts; 7th February 2020 at 23:17.. |
|
8th February 2020, 18:11 | #96 |
Loves to post
MG ZT-T 160 Join Date: Dec 2015
Location: Devon
Posts: 288
Thanks: 179
Thanked 70 Times in 53 Posts
|
Hi folks,
After another 'wait and see what happens overnight' I checked the tensioner position and found it to be still extended where I had positioned it - belt seemed tight (hopefully not too tight) so I cranked the engine a few times and looked at the tensioner piston. Still looked ok. Started the engine no flapping and no undue tight belt type noises - cue happy face! Let it run up to temperature and then stopped the engine for a check and... ...piston pushed back in to where it was when the belt is slack on cold start. Checked now the engine is cool - sure enough, belt is slack once more. So, it appears that my tensioner set-up / pulley adjustment combo is just able to maintain static belt tension and the pulley backplate is free to rotate on the bolt and not jammed. That's good news. But once the engine runs and applies varying dynamic loads which require the damping action to operate, then this just gradually pushes the piston back in which is then unable to spring back to where it was and maintain tension. Whether that is a feature of the pulley set point when fitted or a weak spring in the tensioner is yet to be confirmed. I will be back to fill in the gaps when I've stripped it back to look at the belt run and have some more news. Ciao for now and thanks for reading. Jonty |
8th February 2020, 18:30 | #97 |
This is my second home
Rover 75 cdt club + Rover 2.5 KV6 Conni SE Join Date: May 2008
Location: Birmingham
Posts: 11,393
Thanks: 6,587
Thanked 2,262 Times in 1,729 Posts
|
Hi. In the video I noticed that one of the fastenings holding the cambelt cover on, it looks like it is split. Don’t know if it was done over tightening the cover when the belts were done or if the belt slapping against the cover has caused it. I certainly would not fun the engine until I had found out what was causing the noise. Tensioner I guess.
__________________
Great Barr, Birmingham. Last edited by bl52krz; 8th February 2020 at 18:35.. |
8th February 2020, 18:43 | #98 | |
Loves to post
MG ZT-T 160 Join Date: Dec 2015
Location: Devon
Posts: 288
Thanks: 179
Thanked 70 Times in 53 Posts
|
Quote:
If that was the video on the first page of all this, Wes made the original post about his problem yonks ago - think he got his all sorted with a full belt service in the end. Cheers, Jonty |
|
8th February 2020, 18:46 | #99 |
This is my second home
Rover 75 cdt club + Rover 2.5 KV6 Conni SE Join Date: May 2008
Location: Birmingham
Posts: 11,393
Thanks: 6,587
Thanked 2,262 Times in 1,729 Posts
|
Yea. Cheers jonty Must teach myself to read ALL the posts before coming to a conclusion. Thanks.
|
8th February 2020, 18:52 | #100 |
This is my second home
1979 Capri 1.6L, 1982 Capri 1.6L, 2016 Dacia Stepway Join Date: Jun 2009
Location: Dorset
Posts: 8,595
Thanks: 3,496
Thanked 3,397 Times in 2,218 Posts
|
You're going to have to bite the bullet Jonty and do the same, still sounds like the tensioner is at fault, will you do it yourself?
|
|
|