XJ40 ( XJ81 ) 1986 - 1994

AC compressor

 
  #1  
Old 09-19-2018, 06:29 PM
Senior Member
Thread Starter
Join Date: Jun 2015
Location: Florida
Posts: 684
Likes: 0
Received 188 Likes on 131 Posts
Default AC compressor

My AC compressor clutch took a crap yesterday. I am trying to locate the proper compressor, using Oriellys, Autozone and Advance Auto.
When they put in my year,make and model 1990 XJ6, their websites are coming up with an A6 compressor which is the one used on the Series 3 Jaguars.
My compressor is a Sanden Unit - SD-709.
I had them search that number, but its useless since the SD-709 comes in many, many variations. According to the Sanden website SD-709 is for R12 and was used in many vehicles, hence the variations. It does not state which is the replacement compressor for R134a.
My compressor has the AC lines attached with a plate and a single bolt on the back but the ones they are showing, have the AC lines connecting on the top and use a multi grove belt. Mine uses a V-belt.
The serial # an model# are not legible on the tag.
Can anyone help me with the proper numbers so I can purchase the proper AC compressor without the fear of having to return it because it is the incorrect unit.
My other option is to replace the clutch only. The only problem with that is the possibility that something in the compressor caused the clutch to fail (so says my AC tech)
My compressor looks like this.
 
  #2  
Old 09-19-2018, 08:13 PM
Join Date: Dec 2009
Location: Decatur,TX
Posts: 7,931
Received 4,191 Likes on 2,734 Posts
Default

I have seen SD 510 and SD 709 compressors mounted to the AJ6 engine.

Jaguar has recommendations.

Sometimes you need to combine parts to get the correct compressor and rear plate as well as the clutch/pulley assy.

I have had to buy a compressor and swap some parts around to get the correct combination to work on a specific model from the original unit.

Good luck.

bob
 
Attached Files
The following users liked this post:
Don B (09-29-2018)
  #3  
Old 09-20-2018, 10:32 AM
Senior Member
Join Date: Dec 2012
Location: Rhode Island, USA
Posts: 481
Received 219 Likes on 139 Posts
Default

Check out RockAuto.com and look for the Sanden compressor. Your car should be using the SD-709 and not the older Harrison style GM compressor. Only VERY early XJ40s used them.

I would NOT recommend replacing just the compressor. Almost all the work is getting the compressor in and out of the car. Lots of metal brackets, nuts bolts and washers for these cars. Lots of busted nuckles and tight spaces.

All current new/rebuilt compressors will have seals fitted that are compatible with R-134a. If you’re still using R-12 they are backwards compatible. The issue is R-134a is a much smaller molecule and will leak if you’re using R-12 seals, so no problem the other way.

Nick
 
The following users liked this post:
Don B (09-29-2018)
  #4  
Old 09-20-2018, 12:10 PM
Veteran Member
Join Date: Sep 2012
Location: Victoria BC Canada
Posts: 1,909
Received 1,238 Likes on 773 Posts
Default

Originally Posted by NTL1991 View Post
Almost all the work is getting the compressor in and out of the car. Lots of metal brackets, nuts bolts and washers for these cars. Lots of busted knuckles and tight spaces.
Nick
Tell me about it!
I just changed my compressor belt, couldn't believe there were so many mounting bolts!

Larry
 
  #5  
Old 09-20-2018, 04:51 PM
Senior Member
Thread Starter
Join Date: Jun 2015
Location: Florida
Posts: 684
Likes: 0
Received 188 Likes on 131 Posts
Default

After much research, we finally found a reman compressor, that is the correct fit with no modifications whatsoever.
The parts guy at Oriellys refused to give up and the came up with the following.
Part # MRY 57586. (Single wire)This reman compressor is for a 1990 Jaguar XJS V12. (Pictured below)
This compressor is for R134a. The discharge port on the compressor is larger(3/8") than the one on the R12 compressor(3/16"). I also replaced the dryer and a new V-belt.
I replaced the old R12 Expansion Valve for a new R134a valve. The difference is the size of the orifice.
I drained out the 3 ozs of oil that came in the compressor and added 6 ozs of PAG oil (recommended by Jaguar). I pulled a vacuum on the system for about an hour and put 30 ozs of R134a. (Recommended)
The R12 system for my car called for 40 ozs of R12. So 75% of 40 = 30 ozs.
Air temp at vents 43 degrees. Outside temp 96 degrees.
If I replace the OEM condenser, the inside temperature will drop even further. I will mull on that further.
Thank you all so much for your input.

 
The following 2 users liked this post by sanchez:
Don B (09-29-2018), motorcarman (09-20-2018)
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
slownlo
XJ XJ6 / XJ8 / XJR ( X350 & X358 )
0
06-10-2017 08:12 PM
john_cook12
XJ6 & XJ12 Series I, II & III
5
08-10-2016 11:37 AM
OhioX
X-Type ( X400 )
15
05-13-2012 01:51 PM
crewd62
XJ6 & XJ12 Series I, II & III
3
05-20-2007 10:16 PM
crewd62
Exterior
0
05-20-2007 09:33 PM

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

Thread Tools
Search this Thread
Quick Reply: AC compressor


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: