gearbox problem

[razvan_ro]

hi all. i have a slight problem with a 240sx gearbox. i recently swaped it because the previous, a ca18det gearbox had a finished 2-nd sincro. the thing is that the ka24e gearbox woun't upshift on high revs, i have to wait until it drops below 4000...but on normal driving it feel ok...coud it be the oil, i used 80w-90...??please help

[razvan_ro]

anyone????

[themadscientist]

Your clutch might not be fully engaging. Dropping the RPMs might take enough stress off to allow you force it into gear. Check that.

[razvan_ro]

how do i di that? i'm kinda nooby ...

coul be the master or slave cilinder? or the clutch plate itself...it's from the original ca18det gearbox

[themadscientist]

When you depress the clutch you are pushing a piston that puts fluid pressure from the master cylinder, through the hose, a distribution block, another hose than the slave cylinder. That pushes the slave cylinder's piston out moving the release fork which is a lever pivoting inside the bellhousing on the pivotball. this pushes the throwout bearing against the clutch cover. The cover, at rest, is pushing the clutch against the flywheel and the pressure is released by the aforementioned action. If anything in that system is not working properly the clutch will not fully disengage and there will still be a load on the transmission when you are trying to shift. Think driving with your brake pedal slightly depressed.

This might not be your problem but it is easy to check. put the rear up on stands so the tires are off the ground, engine off. Release the parking brake and spin the tires to rotate the driveshaft. Depending on if you have an LSD and what type you might need to rotate both sides manually as the opposite wheel might counter rotate instead of the driveshaft turning. With the car in gear they should not spin because the engine would have to rotate with it as they are locked together. Have a buddy put the clutch in while it's still in gear and the wheels and driveshaft should spin freely. If they don't or spin but with great effort, you might have a clutch that is not fully disengaging.

Bleeding the clutch system may be in order.

[razvan_ro]

thanks for the info... much apreciated

[themadscientist]

That's what I'm here for.

You mentioned a CA18, you rockin the mighty mite?

[razvan_ro]

not sure if i understand the expresion...i'm from eastern europe...

[themadscientist]

Then I know you have a CA18! You guys got the last of the breed.

[ZOMG.SR20]

you still just confused the crap out of a european congrats

[razvan_ro]

yeah, well, actualy i bought 2 cars, a fairly runing 180sx and a 240sx...but the 240 has no papers(pink slip)..so i'm using it as a spare and donor car....thow i'm hoping to make it a track-only car

[themadscientist]

you still just confused the crap out of a european congrats

Why are you not out rubbing your radiator?