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 Search Today's Posts Mark Forums Read
Notices

Reply
 
Thread Tools Display Modes
Old 14th October 2020, 09:58   #21
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: Middlesex
Posts: 17,094
Thanks: 981
Thanked 2,856 Times in 2,464 Posts
Default

Quote:
Originally Posted by Teflon View Post
New pistons and liners ...
Thanks Cliff. What was the mileage at the time and was a reason found for this rare condition?

Simon
__________________
"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
SD1too is offline   Reply With Quote
Old 14th October 2020, 16:01   #22
Teflon
This is my second home
 
Teflon's Avatar
 
Lagoon 2.0 V6 75 Conn SE Saloon

Join Date: Nov 2006
Location: Chertsey
Posts: 4,775
Thanks: 2,534
Thanked 2,592 Times in 1,423 Posts
Default

Mileage was around 76K, so pretty low. Speaking with Russell and subsequently another ex MGR mechanic, I don't think the issue is as quite as rare as you may imagine, rather it simply goes undiagnosed, or mis-diagnosed. By no means common though.

As for the root cause, it's up for debate. Russell used to work for a main dealer some years back, and said the issue was quite common in low mileage 1.4 K series. One common factor was that the cars in question had all lead a very gentle life and been treated with "kid gloves" as they say - much as I treat mine (it rarely goes over 3K revs). Russells advice going forward was to let the engine work a bit every now and then. No driving like a loon, but just hold it in a low gear a little longer than normal once in a while to give it some excercise.

Interestingly, whilst I had a shed full of engine bits, I was finally able to check the pin holes in the cam covers. Both were perfectly clear - not sure why that should surprise me, but it did nonetheless .

Cliff
__________________


No. 4 of 6
Teflon is offline   Reply With Quote
Old 14th October 2020, 16:45   #23
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: Middlesex
Posts: 17,094
Thanks: 981
Thanked 2,856 Times in 2,464 Posts
Default

Quote:
Originally Posted by Teflon View Post
Mileage was around 76K, so pretty low ... As for the root cause, it's up for debate.
Thanks for this Cliff.
Quote:
Originally Posted by Teflon View Post
I was finally able to check the pin holes in the cam covers. Both were perfectly clear ...
Congratulations! Could it be down to diligent oil changing maybe?

Simon
__________________
"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
SD1too is offline   Reply With Quote
The Following User Says Thank You to SD1too For This Useful Post:
Old 15th October 2020, 19:46   #24
bl52krz
This is my second home
 
bl52krz's Avatar
 
Rover 75 cdt club + Rover 2.5 KV6 Conni SE

Join Date: May 2008
Location: Birmingham
Posts: 9,606
Thanks: 4,954
Thanked 1,751 Times in 1,359 Posts
Default

Quote:
Originally Posted by Teflon View Post
Here's what mine sounded like - more of a knocking than a grinding (noise starts at around the 18 second point):



The knock would only occur when the engine was stone cold, and only for a few seconds (1 minute max), after which all sounded fine. Opinions ranged from tappets, main bearings, idler / tensioner noise etc, however Russell used a long screwdriver as a stethoscope and correctly identified it as piston slap. He suggested the engine would probably out live me and was nothing to worry about at this stage, but being a picky so & so I wanted the noise gone, so he pulled the engine apart and sorted it .

It's worth mentioning, Russel is mobile and has been known to travel a fair distance for jobs. This week he is due to be in Liverpool (though I guess that plan may change with current restrictions). Having said that though, I guess a long trip just to listen and diagnose may not be the most economic approach.

Cliff
Dry tappets?
__________________
Great Barr, Birmingham.

Last edited by bl52krz; 15th October 2020 at 19:49..
bl52krz is offline   Reply With Quote
Old 15th October 2020, 21:15   #25
Teflon
This is my second home
 
Teflon's Avatar
 
Lagoon 2.0 V6 75 Conn SE Saloon

Join Date: Nov 2006
Location: Chertsey
Posts: 4,775
Thanks: 2,534
Thanked 2,592 Times in 1,423 Posts
Default

Quote:
Originally Posted by bl52krz View Post
Dry tappets?
Nope, piston slap



Cliff
__________________


No. 4 of 6
Teflon is offline   Reply With Quote
The Following 2 Users Say Thank You to Teflon For This Useful Post:
Old 15th October 2020, 22:07   #26
edwardmk
Loves to post
 
edwardmk's Avatar
 
MG ZT 260

Join Date: Feb 2013
Location: Camborne
Posts: 299
Thanks: 519
Thanked 117 Times in 78 Posts
Default

Quote:
Originally Posted by Teflon View Post
New pistons and liners, plus new main bearings (it just made sense whilst everything was in bits), new gasket set, and a new clutch.

A lot of work, but it's nice and quiet now as it should be

Cliff
Very interesting post for me. I 'd have to fix a noise like that too. Useful to know.
edwardmk is online now   Reply With Quote
The Following User Says Thank You to edwardmk For This Useful Post:
Old 17th October 2020, 17:21   #27
roverbarmy
This is my second home
 
roverbarmy's Avatar
 
1999 Cowley V6 Auto Zircon Silver

Join Date: Aug 2014
Location: East Norfolk
Posts: 5,146
Thanks: 443
Thanked 1,489 Times in 1,081 Posts
Default

Just a thought but the V6 has a low end induction "growl" which changes as the VIS balance valve opens and closes, between 1000 and 2000 revs approx. This could be mistaken for a grinding noise. (not to be confused with a definite ticking noise)
__________________
Oil in my veins!
roverbarmy 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 +1. The time now is 21:26.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Copyright © 2006-2020, The Rover 75 & MG ZT Owners Club Ltd