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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars


 
 
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Old 04-24-2007, 08:00 PM   #4
donkayroo
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Here's what you gotta do. Don't try torquing to 90ftlbs.

1. Loosen all preload from the spring until there's at least 1.5" of space between the top of the spring and the upper spring perch. There should be zero pressure on the spring whatsoever.

2. From here, you'll be able to tighten the piston to pillowball mounting bolt until it stops, by hand, unless the threads are corroded. To insure it's snug use a ratchet and a drop or two of lock-tite for peace of mind.

3. Retighten the springs' lower collars and add at least .5" or more of preload. How do you measure preload compression?

Once the spring is butted up against the upper perch, tighten the lower collar until it touches the spring then stop. There should be zero play/pressure between the spring and the upper and lower perches. You should be able to rotate the spring freely and the spring shouldn't jiggle up/down.

Mark with a sharpie or visually remember where the lower collar resides then tighten and compress the spring until the lower collar moves up the threaded body at least .5". The more preload you add the more effort you'll exert with the spanners. Of course, don't forget to tighten the locking collar.

I'm running about 1.5"+ of preload with the same rate springs. The preload of the spring will apply pressure to the mounting bolt. That's why, currently, it seems like your bolts are tight enough.

Hope this helps!
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