Go Back   The 75 and ZT Owners Club Forums > The 75 and ZT Owners Club Forums > Technical Help Forum
Register FAQ Image Gallery Members List Calendar Mark Forums Read
Notices

Reply
 
Thread Tools Display Modes
Old 16th November 2019, 12:23   #1
Fred Byrne
Avid contributor
 
Rover 75 Saloon

Join Date: Jun 2018
Location: Ballynahinch
Posts: 194
Thanks: 69
Thanked 60 Times in 23 Posts
Default Engine Timing inlet camwheel

Rover 75 2.5l
I inherited this car from my brother who was offered only scrap price when trading it in for a new electric machine. Good luck to him I say! On listening to the engine sound i realised that there was a problem with timing; it just didn't sound right. I hvae now got to the nitty gritty problem. Who ever fitted the last timing belt not only fitted a belt which was too long but also lost the engine timing. My problem is that he fitted the camwheel on the rear shaft with the part number facing inwards towards the engine block and the cam wheel on the front shaft he fitted the cam wheel with the part number facing out from the engine block. Obviously he was 50% correct!! I have a set of the proper timing tools. When I fit the locking tool to the front shaft (ie the one wth the part number facing out wards) and I check the rear cam wheel marks I find the inlet cam mark on the rear camwheelat about 20 degrees to the left of the correct position whereas the exhaust cam wheel mark is correct. What do I do? This is the first time that I have worked on this car so am not overtly familiar with it. Advice would be gratefully received.

Fred
Fred Byrne is offline   Reply With Quote
Old 16th November 2019, 14:27   #2
Fred Byrne
Avid contributor
 
Rover 75 Saloon

Join Date: Jun 2018
Location: Ballynahinch
Posts: 194
Thanks: 69
Thanked 60 Times in 23 Posts
Default Engine timing inlet camwheel

I think that I have solved this. The correct way round for the cam wheel is with the part number towards the engine block. Everything seems to line up then. Proof of the puddnig will come when I bar the engine over. Many thanks to any one who read this pearl of wisdom.

#Fred
Fred Byrne is offline   Reply With Quote
Old 16th November 2019, 15:06   #3
chris75
same car since 2005
 
chris75's Avatar
 
2001 Rover 75 2.0 v6 Connoisseur Saloon

Join Date: Nov 2006
Location: Ellesmere Port , Cheshire
Posts: 3,810
Thanks: 379
Thanked 549 Times in 466 Posts
Default

Well done ; that didn't take long !
Did you get the right size belt ?
__________________
Who said it was simples ?
chris75 is offline   Reply With Quote
Old 16th November 2019, 16:47   #4
SD1too
Doesn't do things by halves
 
SD1too's Avatar
 
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model.

Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,265
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
Default

Quote:
Originally Posted by Fred Byrne View Post
When I fit the locking tool to the front shaft ... and I check the rear cam wheel marks I find the inlet cam mark on the rear camwheel at about 20 degrees to the left of the correct position whereas the exhaust cam wheel mark is correct. What do I do?
Hello Fred,

It's been discovered that, with the flywheel/drive plate pin inserted on a correctly timed engine, the rear sprocket marks don't quite align. This isn't a fault and it isn't covered by the workshop manuals.

So, to remove the rear sprockets with their belt, it is first necessary to remove the flywheel/drive plate pin and turn the engine very slightly until the rear sprocket marks align.

I thought that you'd like to know that otherwise you'll think it's impossible to time your engine correctly.

By the way Fred, how did you come to the conclusion that the front belt is too long?

Simon
__________________
"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
SD1too is online now   Reply With Quote
Old 20th December 2019, 14:01   #5
Fred Byrne
Avid contributor
 
Rover 75 Saloon

Join Date: Jun 2018
Location: Ballynahinch
Posts: 194
Thanks: 69
Thanked 60 Times in 23 Posts
Default

Hello Simon sorry for my slow reply. I came to the conclusion that the old belt was too long because the new belt supplied by Rimmers was much shorter and just fitted beautifully. I have not finished this job just yet but hope to do so within the next few weeks. If the old belt stretched the timing must have been out by a mile . There was always the possibility that a slack belt could jump a tooth. Stll learning about this beautiful engine.

Fred
Fred Byrne is offline   Reply With Quote
Old 21st December 2019, 13:37   #6
SD1too
Doesn't do things by halves
 
SD1too's Avatar
 
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model.

Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,265
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
Default

Quote:
Originally Posted by Fred Byrne View Post
If the old belt stretched the timing must have been out by a mile.
In that event Fred your engine would run very badly or not at all. I'm not convinced by this stretching theory. If that were to happen, the enlarged teeth would no longer grip the sprocket wheels and the tensioner would run out of adjustment with catastrophic results.

Having done it myself, comparing the length of two belts is actually quite difficult with any degree of accuracy. You'll know that they are not pliable and the new one will tend to have adopted the shape dictated by its packaging. If you followed this subject on the forum last year you'll remember that my belts had covered the maximum mileage recommended by MG Rover and had exceeded the time limit by over three times. I found no evidence of stretching on any of them.

I hope that the rest of the job goes well for you Fred.

Simon
__________________
"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
SD1too is online now   Reply With Quote
Old 22nd December 2019, 14:16   #7
Fred Byrne
Avid contributor
 
Rover 75 Saloon

Join Date: Jun 2018
Location: Ballynahinch
Posts: 194
Thanks: 69
Thanked 60 Times in 23 Posts
Default

Hi Simon. I measured the two belts very carefully and the original belt was one and a quarter inches longer. It literally fell off the pulleys/sprockets as soon as I released the tensioner. i reckon my brother was a very lucky man! I have to admit that replacing the exhaust cam cap seals is the most difficult part of this job. I think it is made more difficult because the engine moves away from you as soon as you start to squeeze them in. Perhaps one should wait until the engine mount has been replaced but access is probably very difficult then.

Fred
Fred Byrne is offline   Reply With Quote
Old 22nd December 2019, 22:12   #8
mh007
This is my second home
 
mh007's Avatar
 
MG ZT260 SE, MG ZT190+, MG ZTT 160, R75 Conn SE 2.0, R75 Conn SE 2.5 X 3, R75 Club SE 1.8, P5B Coupe

Join Date: Jul 2009
Location: Keynsham, Bristol
Posts: 4,211
Thanks: 65
Thanked 635 Times in 499 Posts
Default

Quote:
Originally Posted by Fred Byrne View Post
Hi Simon. I measured the two belts very carefully and the original belt was one and a quarter inches longer. It literally fell off the pulleys/sprockets as soon as I released the tensioner. i reckon my brother was a very lucky man! I have to admit that replacing the exhaust cam cap seals is the most difficult part of this job. I think it is made more difficult because the engine moves away from you as soon as you start to squeeze them in. Perhaps one should wait until the engine mount has been replaced but access is probably very difficult then.

Fred

I've done many belt changes on the KV6 (always with the locking/setting tools, just my personal choice) & never known the old belts to be 'stretched' to any extent, especially the amount mentioned here. The belts are the same for the 2.0ltr & 2.5ltr engines so goodness knows what went on there.


With regards to the camshaft caps, you could always fit standard camshaft oil seals.
mh007 is offline   Reply With Quote
Old 20th December 2019, 16:42   #9
Fred Byrne
Avid contributor
 
Rover 75 Saloon

Join Date: Jun 2018
Location: Ballynahinch
Posts: 194
Thanks: 69
Thanked 60 Times in 23 Posts
Red face Engine timing inlet camwheel

Hello Simon sorry for my slow reply. I came to the conclusion that the old belt was too long because the new belt supplied by Rimmers was much shorter and just fitted beautifully. I have not finished this job just yet but hope to do so within the next few weeks. If the old belt stretched the timing must have been out by a mile . There was always the possibility that a slack belt could jump a tooth. Stll learning about this beautiful engine.

Fred
Fred Byrne is offline   Reply With Quote
Old 4th February 2020, 15:48   #10
trikey
Premium Trader
 
trikey's Avatar
 
Rover 75

Join Date: Nov 2010
Location: Devon
Posts: 33,710
Thanks: 8,837
Thanked 14,831 Times in 8,030 Posts
Default

The driveshafts are the easy part of the job!


Sent from my iPhone using Tapatalk
__________________
Lest we forget..
trikey is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 12:43.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright © 2006-2023, The Rover 75 & MG ZT Owners Club Ltd