1st Gear Crunch

[noony]

Guys,

Am just trying to figure out if my box is stuffed, clutch problem or if its to do with the Nismo short shift kit needing adjustment.

What is the most likely problem?

I dont believe the clutch slips at all, until high load etc...

The box feels strong in all gears and doesnt make any strange noises...Other than the crunching into First. (makes for a great excuse for second gear burnouts..LOL).

Any suggestions is greatly appreciated.

Paul

[linxus40]

if your going to fast or you have just put the clutch in and the box is still spinning it wont let you go into first and if you force it it will crunch. just wait a few second before trying to put it into first and it should be all right.

[Guest two.06l]

Guys,

Am just trying to figure out if my box is stuffed, clutch problem or if its to do with the Nismo short shift kit needing adjustment.

What is the most likely problem?

I dont believe the clutch slips at all, until high load etc...

The box feels strong in all gears and doesnt make any strange noises...Other than the crunching into First. (makes for a great excuse for second gear burnouts..LOL).

Any suggestions is greatly appreciated.

Paul

wait for the hundred or so "no-it-alls tell" you its the synchros.....its the only word they know when they hear crunching gears...Paul...DIRTgarage.

[r33skylinegtst]

Sorry to hijack the thread, but is it bad if my gearbox won't change into first unless im practically stopped or really slow? Like it won't shift at all. Is this a feature of the gearbox?

[Duncan]

wait for the hundred or so "no-it-alls tell" you its the synchros.....its the only word they know when they hear crunching gears...Paul...DIRTgarage.

well, that is exactly where I would start....especially since it has a short shifter which wears the synchros even more. but it is normally 4th/5th where it starts. Also easiest to do something about.....chuck in some good oil like redline lightweight.

What else do you suggest Stacey/Paul?

p1r4t8r, you can only put a car in gear when the speed of the wheels = the speed of the engine for that gear. ie if you are slowing down for instance you should bring the revs up to the right level for that road speed. It will then slip straight into gear, whether or not you use the clutch.

[The Dan]

Some more details always helps.

Does it crunch while completely stopped?

Does it do it just coming out of reverse?

Does it do it while rolling?

If you pump the clutch a couple of times does it crunch then?

How often does it do it...all the time, sometimes?

Is it HARD to shift or does it just crunch?

How long has it been happening.

Does it do it from cold?

Does it do it when hot?

How loud?

What is the condition of the oil?

Have you even checked that?

Why not?

How old is the shift kit?

Did it only happen just after the kit was fitted?

[noony]

Some more details always helps.

 

Does it crunch while completely stopped?

Does it do it just coming out of reverse?

Does it do it while rolling?

If you pump the clutch a couple of times does it crunch then?

How often does it do it...all the time, sometimes?

Is it HARD to shift or does it just crunch?

How long has it been happening.

Does it do it from cold?

Does it do it when hot?

How loud?

What is the condition of the oil?

Have you even checked that?

Why not?

How old is the shift kit?

Did it only happen just after the kit was fitted?

Well...

I Bought the car in October. It was doing a fraction of the time then. I mean fraction.

Now...It does it 80% of the time.

Hot, Cold, Stopped, Rolling(although less when rolling...ie move a bit in 2nd then put into 1st..sweet).

Double, triple clutch..Still cruncch..

Its fairly loud...It actually hurts my wrist if I try and force it in...

It had a FULL service in November, 3 weeks after buying it. The service says that box oil was changed. They are a reputable importer/tuner.

Shift kit cant be that old, I found the Nismo instructions in the Glove Box...Maybe 12 months old (guessing).

The car has 93thou on it.

Thanks guys.

[The Dan]

Possibly spiggot bearing but other than that I would have to say synchros

[wrxhoon]

Possibly spiggot bearing but other than that I would have to say synchros

Spiggot bearing ? is it a skyline ? They have a bush don't they ? At least the ones i have pulled out have , same with the 200 sx 's .

Yea it could be the synchro but could be lots of other things as well .

Noony you say that it crunches even double clutching , you must be doing something wrong then .

As Duncan suggests try matching the revs with the speed of the car for the gear you are trying to select while you are doubleclutching , if you do that it will just drop in .

The synchros have made everyone lazy but they have their limitations too . Don't forget most truck g/boxes don't have synchros , try going through 18 gears without synchros , its easy cause they are very close ratio . Most truckies don't even use the clutch once they take off .

You can jump in to a new car and you may not be able to select a low gear' if you are going to fast and if you do manage to get it in say 1rst while you are doing 100 kmh and let the clutch out you are going to bust something for sure .

Did you notice geting harder after you changed the oil ? Gear oil can make a lot of difference .

A simple way to check if your clutch is working . Stop the car push the clutch in all the way and wait a few seconds then try to put in reverse , if it goes in ok and no crunch then the clutch is working o.k . If it crunches then you probably have a clutch problem . Keep in mind that reverse is a straight gear and there maybe times when the teeth hit each other and it wont go in , just release the clutch and push in again or if the car can roll let it roll a little .

With practice you can change all gears without using the clutch at all and without crunching ( car must be moving though ) .

[The Dan]

yeah, I call them all spiggot bearings. You get the general idea.

But I think you are missing the whole point of this guys problem. Maybe I'm wrong but I don't think his problem is that he can't select first at 80km's/hour. His problem is while not moving at all it crunches.

Not a very acurate way of testing a clutch either. Reverse, as you stated, does not have helical(sp?) cut gears so more often than not you will get some kind of a noise while shifting. Most of the time no probs but if you guage a clutches operation by a crunch into reverse then I think I had better go replace my 1 week old clutch.

Usually if it is an oil problem, it will crunch in more than just first.

[noony]

yeah, I call them all spiggot bearings. You get the general idea.

But I think you are missing the whole point of this guys problem. Maybe I'm wrong but I don't think his problem is that he can't select first at 80km's/hour. His problem is while not moving at all it crunches.

EXACTLY!

It wont go into 1st gear easily while stopped. It actually is quite forceful if you try and slam it in.

Theres no revs to match...Because Im not moving..>The car is idling at most. Even if I play with the revs a little, it still crunches.

Synchros most likely problem...? So I should just take it to a 'box' place?

The problem with box places is that all my friends who have gone to them have basically just ended up buying a whole new box when there old box was not that bad anyway.

Anyone reccommend someone in the ACT region?

[ylwgtr2]

reverse is helical cut.....generally old cars reverse gear is straight cut...its really noticible when reversing you hear a huge whine.....It doesnt sound like a synchro problem....depress the clutch if you wait with the clutch in for a while then try to select the gear in question and it doesnt grind i would assume its not the synchro

[Duncan]

nope if it is getting it into 1st gear when stopped at idle it is almost certainly not synchros.

perhaps a master or slave cylinder problem so the clutch is not disengaging properly?

[The Dan]

he just said it ISN'T getting into first when stopped..

My suggestion before you pull out the box. Adjust the clutch a bit. If this doesn't help out, you'll have to remove the box and inspect the spiggot bush. If that's ok then bank on a synchro. Gbox shop will be able to tell you once you have it out anyway.

[wrxhoon]

yeah, I call them all spiggot bearings. You get the general idea.

But I think you are missing the whole point of this guys problem. Maybe I'm wrong but I don't think his problem is that he can't select first at 80km's/hour. His problem is while not moving at all it crunches.

 

Not a very acurate way of testing a clutch either. Reverse, as you stated, does not have helical(sp?) cut gears so more often than not you will get some kind of a noise while shifting. Most of the time no probs but if you guage a clutches operation by a crunch into reverse then I think I had better go replace my 1 week old clutch.

Usually if it is an oil problem, it will crunch in more than just first.

If it crunches when at a complete stop then it cant be the synchro but it can be a problem with the clutch either hydrolics or p/plate .

Actualy its a very accurate way of testing the clutch operation , if it crunches when you engage reverse ( i mean crunch not just a clung as you will almost always hear when selecting reverse ) then it means the gearbox is still turning !!!

If you have a siezed spiggot it may do that too as the main shaft will be turning but its not likely in this case , spiggot bushes don't usualy seize . When they were out they usualy become sloppy , unlike spiggot bearings that can seize .

Unless i have the car here to test myself i cant tell for sure , noony is not describing it well and it sounds like his mechanical knowledge is very limited .

noony , if the clutch slips or not it has nothing to do with selecting gears .

When you push the clutch to the floor it shouldn't touch the flywheel or the pressure plate .

Take it somewhere and have it checked out and see what they say , they will tell you what the problem is without removing the box .

[The Dan]

hahahaha

[noony]

Unless i have the car here to test myself i cant tell for sure , noony is not describing it well and it sounds like his mechanical knowledge is very limited .

noony , if the clutch slips or not it has nothing to do with selecting gears .

When you push the clutch to the floor it shouldn't touch the flywheel or the pressure plate .

Do you even understand the problem...

And as for jumping to conclusions about my mechanical knowledge..."very limited"...right....

Double Clutching...

Wat is there to get wrong?

I start the car, its still in neutral from when I stopped the car. The input shaft is spinning already, the box is matched to the speed of the flywheel....What the hell is there to double clutch!!

Clutch in, Push gear to 1st...crunch...ok...try again....

Back to neutral, clutch out, clutch in, push to first.....crunch....

I will be adjusting the clutch end of next week when I get the car back from the Spray Booth. I will let you know how it goes.

[wrxhoon]

Do you even understand the problem...

And as for jumping to conclusions about my mechanical knowledge..."very limited"...right....

Double Clutching...

Wat is there to get wrong?

I start the car, its still in neutral from when I stopped the car. The input shaft is spinning already, the box is matched to the speed of the flywheel....What the hell is there to double clutch!!

Clutch in, Push gear to 1st...crunch...ok...try again....

Back to neutral, clutch out, clutch in, push to first.....crunch....

I will be adjusting the clutch end of next week when I get the car back from the Spray Booth. I will let you know how it goes.

Ok bud cool down take it easy , i'm only trying to help , if you dont want it well don't take it .

As your mechanical knowledge being very limited , i still think it is , if it wasn't you would have the problem solved by now .

If you think you know it all , then well and good for you , to me it sounds like you are still wet behind the ears .

As for double clutching , i didn't say you need to do that so it won't crunch while the car is stationary , as a matter of fact it won't make any difference .

What i said was that with practice you don't need to use the clutch to change gears while the car is moving , most trucks still don't have synchro boxes and most truckies don't use the clutch to change gears after taking off .

[The Dan]

What i said was that with practice you don't need to use the clutch to change gears while the car is moving , most trucks still don't have synchro boxes and most truckies don't use the clutch to change gears after taking off .

And what the hell has that got to do with the problem he is trying to solve.