Go Back   Jaguar Forums - Jaguar Enthusiasts Forum > Jaguar Models ( Modern ) > XJ ( X308 ) XJ8 / XJR
Sign in using an external account
Register Forgot Password?
Search

XJ ( X308 ) XJ8 / XJR 1997 - 2003

Welcome to Jaguar Forums!
Welcome to JaguarForums.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Jaguar Forums community today!


Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 04-11-2010, 07:07 PM
JWT JWT is offline
Senior Member
 
Join Date: Dec 2009
Location: Calgary Alberta Canada
Posts: 204
Thanked 32 Times in 19 Posts
Default Loud Grinding Noise on Startup

This past week my 98 XJR produced a loud noise on start-up. I immediately switched the engine off when I first heard it (2 or 3 seconds). When I tried again the noise was gone and everything sounded fine. I thought perhaps the starter had remained engaged, but a couple of days later, it did it while at idle, about 10 seconds after start-up, so I assume it is not the starter. It happened once again yesterday on start-up, then gone on re-start. I am wondering of it may be a belt tensioner or idler pulley. That may be wishful thinking as it is quite loud and ominous sounding, like something trying to seize up. On all three occasions it disappeared on the next start. It is hard to describe, but it is like a medium pitched whine with a bit of grind to it and is quite loud inside the cabin. If anyone has any ideas, I would appreciate hearing.
Reply With Quote
  #2  
Old 04-11-2010, 08:19 PM
QuadManiac's Avatar
Senior Member
 
Join Date: Oct 2009
Location: San Diego, CA
Posts: 893
Thanked 69 Times in 61 Posts
Default

Have you replaced your secondary timing chain tensioners? This may not be your sound, but a 'grind' at start up is a common reference to the sound that is heard as the old, plastic tensioners are about to give up the ghost.

Probably best to open the hood and have someone else start it up while you try to locate the are from which the sound is generated - if it's near the front of either valve cover, the tensioner is a good bet.
__________________
2000 XJ8 Anthracite/Charcoal
Reply With Quote
  #3  
Old 04-12-2010, 08:43 PM
JWT JWT is offline
Senior Member
 
Join Date: Dec 2009
Location: Calgary Alberta Canada
Posts: 204
Thanked 32 Times in 19 Posts
Default

I have replaced all 4 chains, tensioners & guides.
This sound is very loud. Now that I have heard it five or six times for 3 or 4 second intervals, it seems to be a grating noise, perhaps a bearing about to blow up. I am now suspicious of the air conditioning compressor. It has been hard to pinpoint, as it disappears as quickly as it appears. I am sure it will only get worse, which will likely help identify it. I will take your advise and have someone else start the motor. It seems to happen only at start-up, no trouble after that... so far. I am not sure if I can DIY the compressor or not, but would like to, if it is the culprit. No experience with A/C though.
Reply With Quote
  #4  
Old 04-12-2010, 08:59 PM
H20boy's Avatar
Veteran member

 
Join Date: Mar 2007
Location: Ft Worth, TX
Posts: 11,064
Thanked 816 Times in 615 Posts
Default

definitely worth looking/listening to the idler pulley, they go quite often, then possibly the tensioner pulley. Of course, this coming from the guy who thought it was one, then the other, and turned out to be the power steering pump wailing from the lack of fluid due to a leak on the system. Of course, mine was very intermittent at first...just at the start of the engine cranking, but progressively, it was all of the time.
__________________
Matt | 2003 XK8 CvTbl | 2005 SuperV8
My Jag Galleries



Go Texas Tech!


Reply With Quote
  #5  
Old 04-12-2010, 10:21 PM
JWT JWT is offline
Senior Member
 
Join Date: Dec 2009
Location: Calgary Alberta Canada
Posts: 204
Thanked 32 Times in 19 Posts
Default

Thanks. I'll try the stethoscope on the idlers, (if I can, and carefully). But you gave me another good idea. I have not checked the power steering fluid level yet. I would be pleased if it was just an idler.
Reply With Quote
  #6  
Old 04-13-2010, 08:48 PM
JWT JWT is offline
Senior Member
 
Join Date: Dec 2009
Location: Calgary Alberta Canada
Posts: 204
Thanked 32 Times in 19 Posts
Default Grating & Grinding

I have pretty much confirmed that I have an A/C compressor that is complaining loudly on start-up.

With a stethoscope I was able to hear the grinding by placing the probe just behind the pulley on the compressor. The belt idlers seemed fine.

Can anyone advise on whether it is possible to change the clutch only and avoid disconnecting the lines and purging the A/C refrigerant? Changing the compressor out seems fairly straight forward, but dealing with the refrigerant... not so simple for a DIY. I would still prefer to repair this myself if at all feasible, so any instruction from someone who has done this would be greatly appreciated. Every time I fix something on this car... it is a first time. I spend more time figuring out how to do it. I would need sage advice this time I think, rather than charging in with wrenches.
Reply With Quote
  #7  
Old 04-14-2010, 05:02 AM
Veteran Member
 
Join Date: Mar 2008
Location: Ellijay
Posts: 4,192
Thanked 616 Times in 534 Posts
Default

There are lots of AC help sites on the web. On a previous car I had an AC problem, bought a complete set of gauges, vacuum pump, etc. from Harbor Freight for about $125. Fixed the problem and then sold the stuff on ebay for just about what I paid for it.

Tight Wad Tom
__________________
2002 XK8
2001 Honda GL1800A
1982 Volvo 245 Ford 302 V8 http://forums.turbobricks.com/showthread.php?t=250257
1981 Volvo Bertone Coupe - 25k original miles http://forums.turbobricks.com/showthread.php?t=256460
Reply With Quote
  #8  
Old 04-15-2010, 01:23 AM
JWT JWT is offline
Senior Member
 
Join Date: Dec 2009
Location: Calgary Alberta Canada
Posts: 204
Thanked 32 Times in 19 Posts
Default

I will do some research, but if anyone knows of a good writeup, please let me know. I saw an excellent one for an XJS, but the pump is much easier to access, allowing for clutch removal without disconnecting any refrigerant lines. On an XJR the pump is tucked away. It may be easier to replace the entire unit, but I would need some schooling on purging and re-charging, provided I can get the required tools. A/C seems to work fine. If it seems too daunting, I may have to take it in, but that would be no fun.
Reply With Quote
  #9  
Old 04-17-2010, 03:24 PM
JWT JWT is offline
Senior Member
 
Join Date: Dec 2009
Location: Calgary Alberta Canada
Posts: 204
Thanked 32 Times in 19 Posts
Default A/C Compressor

Upon closer inspection, I have discovered that rubber section in the outer hub on the clutch has deteriorated, allowing it to contact the inside wall of the pulley. That is what makes all the racket. Perhaps I can replace that component for now and avoid opening the system up. Born Again Air in Texas handle the parts I believe. Just hoping I can get it apart without having to remove the compressor. If not... might as well replace the whole thing.

If anyone has done this, I would appreciate hearing about it.

Best Regards
Reply With Quote
  #10  
Old 04-17-2010, 05:50 PM
QuadManiac's Avatar
Senior Member
 
Join Date: Oct 2009
Location: San Diego, CA
Posts: 893
Thanked 69 Times in 61 Posts
Default

Quote:
Originally Posted by JWT View Post
Upon closer inspection, I have discovered that rubber section in the outer hub on the clutch has deteriorated, allowing it to contact the inside wall of the pulley. That is what makes all the racket. Perhaps I can replace that component for now and avoid opening the system up. Born Again Air in Texas handle the parts I believe. Just hoping I can get it apart without having to remove the compressor. If not... might as well replace the whole thing.

If anyone has done this, I would appreciate hearing about it.

Best Regards
I had the same issue with a Ford product a few years back - a Mustang. In that case there was room to remove/replace just the clutch assy... don't know about the Jag.

Rock Auto shows a replacement AC compressor clutch assy for a 98 XJ8 for $145. DENSO Part # 4730308 - Compressor Clutch #MCA7300AE
__________________
2000 XJ8 Anthracite/Charcoal

Last edited by QuadManiac; 04-17-2010 at 05:55 PM.
Reply With Quote
  #11  
Old 04-17-2010, 08:32 PM
JWT JWT is offline
Senior Member
 
Join Date: Dec 2009
Location: Calgary Alberta Canada
Posts: 204
Thanked 32 Times in 19 Posts
Default

Thanks Quad,
I had a look and it seems somewhat feasible with the compressor in the car, but I may have to take the sway bar off. Perhaps the radiator too if I need extra room for a puller. Will get the parts and go from there.

Wayne
Reply With Quote
  #12  
Old 04-17-2010, 11:12 PM
QuadManiac's Avatar
Senior Member
 
Join Date: Oct 2009
Location: San Diego, CA
Posts: 893
Thanked 69 Times in 61 Posts
Default

Hmm, a bit painful, but still beats opening the sealed system, IMO.
__________________
2000 XJ8 Anthracite/Charcoal
Reply With Quote
  #13  
Old 05-24-2011, 08:06 AM
Member
 
Join Date: Apr 2008
Location: NYC
Posts: 37
Thanks: 0
Thanked 1 Time in 1 Post
Default

Has anybody confirmed that this sound is the a/c compressor? For like a year now upon startup in the morning I get one loud but short grind sound. I've had my whole tensioner setup replaced awhile ago so I don't think that's it.

Thanks.

Last edited by poisonpill; 05-24-2011 at 09:54 AM.
Reply With Quote
Old 05-24-2011, 08:06 AM
 
 
 
Reply



Tags
ac, car, compressor, grind, grinding, grinds, jaguar, loud, noise, pulley, smells, start, startup, xj6, xjr



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are On
Pingbacks are On
Refbacks are On


Advertising

Featured Sponsors
Vendor Directory
Our Sponsors
All times are GMT -5. The time now is 06:02 PM.

Copyright © 2010 Internet Brands, Inc. All rights reserved.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014 vBulletin Solutions, Inc. All rights reserved.
JAGUAR and its logo are the registered trademarks of Jaguar Cars Limited. Jaguar Cars Limited is not affiliated with JaguarForums.com.