MrWhite
06-18-2008, 05:09 PM
I don´t know if this is an old topic, but I couldn´t find anything on the net about this before doing it myself. Installing a Nismo LSD is a lot easier than one would think (this is how I did it yesterday).
1. Remove the whole diff housing from the car:
- Half-shafts 14mm wrenches (remember how the bolts sat)
http://www.car-engineering.se/350z/halfshaft.jpg
- Main-shaft 17mm wrenches (remember how the bolts sat and mark the position of the shaft toward the diff)
http://www.car-engineering.se/350z/main_shaft.jpg
- ABS sensors 12mm wrench
- Vent (small on top of diff, the end is "clicked" into the top of the subframe)
- Let the flanges stay on.
http://www.car-engineering.se/350z/empty.jpg
2. Empty the oil and remove the flanges (use something like a plastic hammer or similar to knock these out)
http://www.car-engineering.se/350z/out_drain.jpg
3. Remove back cover (14mm electric wrenck on "hammer" setting worked great)
http://www.car-engineering.se/350z/opened.jpg
4. Before next step - KEEP AN EYE ON THE SIDE RACES when you do this:
- Measure the backlash / play so you have a reference value to compare with later (write it down!).
- MARK the bearing holders (which goes on which side and how they were mounted - take a pic to be SURE.
- Remove the bearing holders (if I remember right these were 16mm and the electric wrench on hammer setting worked fine again).
- Use a back hammer (word?) to get the old pumpkin out.
- Put the side races in separate bags, mark them "tooth side of gear" resp "back side of gear"
*** HERE YOU HAVE SPENT APPR 1 HOUR depending on how quick you were.
http://www.car-engineering.se/350z/old_pumpkin.jpg
5. Remove all scraps from the old fluid gasket on the back of the housing and the back cover.
- If you have an industrial wash machine, clean the housing and the back cover.
http://www.car-engineering.se/350z/wash.jpg
While the housing is being cleaned do this.
6. Remove the main gear from the pumpkin and DISCARD the old bolts. Use a strong electric wrench tool on hammer setting. Clean the bolt holes/threads on the back of the gear THOROUGHLY.
http://www.car-engineering.se/350z/gear.jpg
7. Pick the new pumpkin up out of the box (the Nismo GT LSD). If you are happy with 1,5-way, let it be, if not, see manual for how to make it a 2-way.
- Mount the big gear on the new pumpkin using NEW bolts and loctite. Use a tiny bit rust-preventive oil on the seating/bearing end of the bolt head - but make sure it does NOT go onto the threads!! Be sure to tighten diagonally and according to specified torque. Make sure to mark the bolt heads so you don´t miss tightening any of the bolts.
- Re-tighten, again diagonally. Mark again.
8. Mount the new ball bearings to the pumpkin. Place the pumpkin so you have the axis vertical, lay the bearing on with a gentle tap. Use a heater gun (that very hot hairdryer style thing) to heat up the bearing and then gently knock the bearing all the way down on the tap using some sort of perfectly sized socket. Do on both sides.
http://www.car-engineering.se/350z/ready.jpg
******** HERE YOU HAVE SPENT APPR 2,5 HOURS TOTAL.
9. Replace the seals on each side of the housing with new ones (just pull the old ones out).
10. Apply some differential oil on the bearings. Put the bearing covers over the bearings. Get the side races and make sure you put them in on the same side as before.
11. Squeeze the pumpkin into the housing (gently - might have to use a plastic hammer to get it in place - but as I said - be gentle!). Also while doing this make sure the gear is in a position where it matches the pinion gear so you´re not trying to force the pumpkin in tooth to tooth.
12. Mount the bearing holders (remember to check the marks - or pics so you put them on the right way and right side) and tighten bolts to specified torque.
13. Measure back-lash (0,1-0,15mm according to Nismo GT L.S.D. manual) and check gear contact.
14. Mount back cover on housing using fluid gasket. Tighten bolts to speficied torque.
- Also mount the drain plug with a new gasket (spec'd torque).
15. Put the whole diff back into the car.
- Put the NEW left flange into the diff, be careful with the seal (they look the same on both sides - DO NOT USE THE OLD ONES!!).
- Mount the left half-shaft to flange and tighten bolts
- Mount the left side ABS sensor and tighten bolt
- Mount the main shaft and tighten bolts
- Attach the vent hose to the subframe
http://www.car-engineering.se/350z/adjust_preload.jpg
16. Pull the handbrake really hard and put the car into 1st gear. Adjust the pre-load you want using a 19mm box socket that goes in through the right flange hole. Be very gentle, it does NOT take a lot of force, it´s just a gentle resistance.
17. Mount the right side flange (be careful with the seal).
- Mount the right half-shaft to the flange and tighten bolts.
- Mount the right side ABS sensor and tighten bolt.
http://www.car-engineering.se/350z/done.jpg
18. Remove the oil filler plug and fill oil until it flows over.
19. Mount filler plug using the new gasket.
******** NOW YOU HAVE SPENT ABOUT 3,5 HOURS ************
The difference from the stock VLSD and the Nismo GT LSD, 1,5-way at the 100% setting is like day and night.
I chose to go with the 1,5-way setting since this is my "Daily drifter". The diff really locks - no more one-wheel spins and it is VERY VERY quiet. Only a gentle jerk SOMETIMES when I park the car or drive a tight right at an intersection. I RECOMMEND THIS DIFF!! (I´ll be back with drift comments after ASB4 next weekend).
http://www.car-engineering.se/350z/car_done.jpg
1. Remove the whole diff housing from the car:
- Half-shafts 14mm wrenches (remember how the bolts sat)
http://www.car-engineering.se/350z/halfshaft.jpg
- Main-shaft 17mm wrenches (remember how the bolts sat and mark the position of the shaft toward the diff)
http://www.car-engineering.se/350z/main_shaft.jpg
- ABS sensors 12mm wrench
- Vent (small on top of diff, the end is "clicked" into the top of the subframe)
- Let the flanges stay on.
http://www.car-engineering.se/350z/empty.jpg
2. Empty the oil and remove the flanges (use something like a plastic hammer or similar to knock these out)
http://www.car-engineering.se/350z/out_drain.jpg
3. Remove back cover (14mm electric wrenck on "hammer" setting worked great)
http://www.car-engineering.se/350z/opened.jpg
4. Before next step - KEEP AN EYE ON THE SIDE RACES when you do this:
- Measure the backlash / play so you have a reference value to compare with later (write it down!).
- MARK the bearing holders (which goes on which side and how they were mounted - take a pic to be SURE.
- Remove the bearing holders (if I remember right these were 16mm and the electric wrench on hammer setting worked fine again).
- Use a back hammer (word?) to get the old pumpkin out.
- Put the side races in separate bags, mark them "tooth side of gear" resp "back side of gear"
*** HERE YOU HAVE SPENT APPR 1 HOUR depending on how quick you were.
http://www.car-engineering.se/350z/old_pumpkin.jpg
5. Remove all scraps from the old fluid gasket on the back of the housing and the back cover.
- If you have an industrial wash machine, clean the housing and the back cover.
http://www.car-engineering.se/350z/wash.jpg
While the housing is being cleaned do this.
6. Remove the main gear from the pumpkin and DISCARD the old bolts. Use a strong electric wrench tool on hammer setting. Clean the bolt holes/threads on the back of the gear THOROUGHLY.
http://www.car-engineering.se/350z/gear.jpg
7. Pick the new pumpkin up out of the box (the Nismo GT LSD). If you are happy with 1,5-way, let it be, if not, see manual for how to make it a 2-way.
- Mount the big gear on the new pumpkin using NEW bolts and loctite. Use a tiny bit rust-preventive oil on the seating/bearing end of the bolt head - but make sure it does NOT go onto the threads!! Be sure to tighten diagonally and according to specified torque. Make sure to mark the bolt heads so you don´t miss tightening any of the bolts.
- Re-tighten, again diagonally. Mark again.
8. Mount the new ball bearings to the pumpkin. Place the pumpkin so you have the axis vertical, lay the bearing on with a gentle tap. Use a heater gun (that very hot hairdryer style thing) to heat up the bearing and then gently knock the bearing all the way down on the tap using some sort of perfectly sized socket. Do on both sides.
http://www.car-engineering.se/350z/ready.jpg
******** HERE YOU HAVE SPENT APPR 2,5 HOURS TOTAL.
9. Replace the seals on each side of the housing with new ones (just pull the old ones out).
10. Apply some differential oil on the bearings. Put the bearing covers over the bearings. Get the side races and make sure you put them in on the same side as before.
11. Squeeze the pumpkin into the housing (gently - might have to use a plastic hammer to get it in place - but as I said - be gentle!). Also while doing this make sure the gear is in a position where it matches the pinion gear so you´re not trying to force the pumpkin in tooth to tooth.
12. Mount the bearing holders (remember to check the marks - or pics so you put them on the right way and right side) and tighten bolts to specified torque.
13. Measure back-lash (0,1-0,15mm according to Nismo GT L.S.D. manual) and check gear contact.
14. Mount back cover on housing using fluid gasket. Tighten bolts to speficied torque.
- Also mount the drain plug with a new gasket (spec'd torque).
15. Put the whole diff back into the car.
- Put the NEW left flange into the diff, be careful with the seal (they look the same on both sides - DO NOT USE THE OLD ONES!!).
- Mount the left half-shaft to flange and tighten bolts
- Mount the left side ABS sensor and tighten bolt
- Mount the main shaft and tighten bolts
- Attach the vent hose to the subframe
http://www.car-engineering.se/350z/adjust_preload.jpg
16. Pull the handbrake really hard and put the car into 1st gear. Adjust the pre-load you want using a 19mm box socket that goes in through the right flange hole. Be very gentle, it does NOT take a lot of force, it´s just a gentle resistance.
17. Mount the right side flange (be careful with the seal).
- Mount the right half-shaft to the flange and tighten bolts.
- Mount the right side ABS sensor and tighten bolt.
http://www.car-engineering.se/350z/done.jpg
18. Remove the oil filler plug and fill oil until it flows over.
19. Mount filler plug using the new gasket.
******** NOW YOU HAVE SPENT ABOUT 3,5 HOURS ************
The difference from the stock VLSD and the Nismo GT LSD, 1,5-way at the 100% setting is like day and night.
I chose to go with the 1,5-way setting since this is my "Daily drifter". The diff really locks - no more one-wheel spins and it is VERY VERY quiet. Only a gentle jerk SOMETIMES when I park the car or drive a tight right at an intersection. I RECOMMEND THIS DIFF!! (I´ll be back with drift comments after ASB4 next weekend).
http://www.car-engineering.se/350z/car_done.jpg