Hi
Car: Jaguar XJ12C.
I have put an IRS back together but I have a feeling the car ended up way too high.
Maybe I assembled the shock/spring assembly incorrect (or I got the wrong shocks).
I have measured the length of shock/spring assembly (between mounting holes) before mounting into IRS: 335mm (~13.2")
Could anyone say if this is the correct length?
Thanks
/Marcus

 

The unloaded length is irrelevant. The compressed length of the spring when on the car is part of the total, plus the length each end of the shock from the spring perch to the eye.
So on the attached marked up photo, the two lengths marked in blue, PLUS the length of the spring when on the car wheels on the ground; not easy to measure without a four post lift. If the shocks and the springs are new, then the ride height may well be higher. If too high, you have to buy platform (height) adjustable shocks, or softer springs.
In general, new springs for older Jaguars are a real problem, as Jaguar have lost the spring rates they used - incredible but true. There are places in England who can custom make springs, but a decent second hand set from a breaker is a very good option.

 

Hello, Marcus,
Have you driven it yet or merely set it back on the ground?
I ask because, even driving around the block (better yet over a speed bump) will settle the suspension to its natural level whereas merely setting it on the ground will not.

All the rubber parts and shocks have some resistance to compression which is what makes them work.
So you have to show them who's boss.

Drive it for a little bit before you panic (I can tell you how I know this).
(';')