Recommendation for Compression Tester & Spark Plug Spanner
#1
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Team XJS,
As I wince from having to go out and purchase a load of imperial size sockets and spanners to get started as a tribute to the British heritage of my XJS todo list, I thought I should ask for a reccomendation for a compression tester and spark plug spanner. AFAIK my compression is good, but it's always hard to tell with cars such as this and I might as well measure it whilst I'm doing the spark plugs.
I looked at Amazon for a compression tester but the sizes that they were quoting for the threads all seemed metric, such as 12 or 15mm, and I know accessing the spark plugs can be a little challenging, so I thought I'd bounce the question off the collective![Smile](https://www.jaguarforums.com/forum/images/smilies/smile.gif)
Best, Norfolk
As I wince from having to go out and purchase a load of imperial size sockets and spanners to get started as a tribute to the British heritage of my XJS todo list, I thought I should ask for a reccomendation for a compression tester and spark plug spanner. AFAIK my compression is good, but it's always hard to tell with cars such as this and I might as well measure it whilst I'm doing the spark plugs.
I looked at Amazon for a compression tester but the sizes that they were quoting for the threads all seemed metric, such as 12 or 15mm, and I know accessing the spark plugs can be a little challenging, so I thought I'd bounce the question off the collective
![Smile](https://www.jaguarforums.com/forum/images/smilies/smile.gif)
Best, Norfolk
#2
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I believe the spark plugs are 14 mm threads and take a regular old 5/8" spark plug socket for removal. If the Jaguar supplied spark plug removal tool (very handy tool) is missing from your tool kit, I find a U-joint and an extension works pretty well to crack them loose. Then, I usually slip a tight fitting piece of rubber hose over the spark plug to thread them out and the new ones back in. Those threads can get a bit long with my hand in tight places.
As far as the compression tester goes, I rented one from Autozone or O'Reillys (can't remember; most parts stores have them in their loaner tool program). Those kits usually have adapters for most spark plug threads including 14 mm.
As far as the compression tester goes, I rented one from Autozone or O'Reillys (can't remember; most parts stores have them in their loaner tool program). Those kits usually have adapters for most spark plug threads including 14 mm.
The following users liked this post:
Norfolk Enchants (10-16-2015)
#3
![Default](/forum/images/icons/icon1.gif)
I believe the spark plugs are 14 mm threads and take a regular old 5/8" spark plug socket for removal. If the Jaguar supplied spark plug removal tool (very handy tool) is missing from your tool kit, I find a U-joint and an extension works pretty well to crack them loose. Then, I usually slip a tight fitting piece of rubber hose over the spark plug to thread them out and the new ones back in. Those threads can get a bit long with my hand in tight places.
As far as the compression tester goes, I rented one from Autozone or O'Reillys (can't remember; most parts stores have them in their loaner tool program). Those kits usually have adapters for most spark plug threads including 14 mm.
As far as the compression tester goes, I rented one from Autozone or O'Reillys (can't remember; most parts stores have them in their loaner tool program). Those kits usually have adapters for most spark plug threads including 14 mm.
The following users liked this post:
Norfolk Enchants (10-16-2015)
#4
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![](https://cimg9.ibsrv.net/gimg/www.jaguarforums.com-vbulletin/1081x747/jag_tool_kit_5cdf3226d6e1f62cf489f9309ae58f00a9804827.png)
...and I ordered this OTC 5605 compression tester from Amazon.
![](https://cimg2.ibsrv.net/gimg/www.jaguarforums.com-vbulletin/1151x489/compression_tester_1259d456b90fe9df4a236ffe7f4c2e2e055a05ef.png)
Thanks for the help, you guys rock!
Last edited by Norfolk Enchants; 10-17-2015 at 07:58 AM.
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