Hello People,

 

I have noticed that i am having a few crunching moments!!

 

Mainly from 3rd to 4th but it doesnt do it all the time, reverse also can do it sometimes, but also i drove it hard the other day and went from 2nd to 3rd very quick and was straight on the gas full and it was riding the clutch??

 

Tried it again but a bit more smoother and it was fine.

 

The clutch is a stillen kevlar put in about 20k ago.

 

I spoke to grasshopper and they say it is prob a linkage problem as this is quite common especially from 3rd to 4th.

 

Any ideas??

 

Cheers

Kirbz

May also be a leak in the master or slave cylinder.

 

What's the level like in the resovuir ?

 

Where is the biting point on the clutch when you get the crunching ?

Hi Stu

 

I checked the resovoir earlier and i think its fine

 

The crunching happens when the clutch is full pressed in and i change gear :confused:

 

 

Kirbz

Sounds like the synchros to me. Mine is the same, especially on 4th.

It is acually a known problem to Nissan and I believe in the US and Japan you could get a discount to rectify it.

 

Stuart

Originally posted by SRRAE

It is acually a known problem to Nissan and I believe in the US and Japan you could get a discount to rectify it.

 

Stuart

 

Might be wrong but the clutch problem was for a faulty master cylinder which actually has the opposite effect to the problem here.

Info is probably among this lot somewhere !

 

http://www.300zx.org.uk/service_bulletins_&_recalls.htm

The A to Z book by Scott Philbrook mentions 90/91 models with the problem.

 

Quote

TRANSMISSION FLUID AND THE ENDLESS GRIND

The gear-grinding problem in the 1990 and newer 300ZXs with

manual transmissions is the car’s most common problem. I know

more people who have experienced this problem than any other one

mentioned here or anywhere that I have done my research.

My own car was a good example. It ground the gears when shifting

into and out of fourth and sometimes other gears. The worst thing

about was it most often happened during hard acceleration.

Apparently there is a problem with the synchronizers in the manual

transmissions of the 1990 and ’91 models.

I waged an unsuccessful battle against Nissan to have something

done about this. I wanted a service recall or at least some financial

assistance with repairs. Nissan dealt with me diplomatically — I received a form letter that demonstrated to me that they hadn’t even

read the letter I sent them. Nissan stated that there was no evidence

that my problem was apparent in any cars other than my own. My

original letter listed almost 30 other 300ZX owners from all over the

world who had the same problem. I had even discovered a Technical

Service Bulletin that indicated how to fix the problem that Nissan

was now denying to me even existed.

Here’s information on the bulletin:

 

BULLETIN INFORMATION

It was titled, “GRINDS REPAIR KIT NTB91-086” and

specifically related to the 1990 and ’91 300ZXs. It was labeled

Manual Transmission Classification MT91-002, and its bulletin

number was NTB91-086, dated October 24, 1991.

The bulletin applied to the following VIN numbers:

JN1RZ26**MX999999

JN1RZ24**MX504315

JN1CZ24**MXSOS910 [that’s MXS and the letter “O” followed

by S91 and the number zero].

The bulletin said that customers may complain of a grinding

35

problem when changing from fourth to fifth gears. It goes on to

say that, after checking all the basics, like pedal adjustments, etc.,

that a repair kit is available.

The repair kit is to be installed by removing the transmission

and installing the kit, using the same procedure as used to overhaul

the transmission.

The kit’s part number is 32220-30P25. It contains the following:

Spring-Insert Fifth Reverse, 32615-30P10;

Fork Rod, Fifth, 32816-30P10;

Sleeve Coupling, Fifth, 32616-30P10;

Ring-Baulk, Reverse, 32617-30P10;

Gear-Reverse Countermeasure, 3220-30P10; and

Ring Baulk, Fifth, 32614-30P10.

These parts must be used only as a set on vehicles built prior

to the applied VIN numbers.

 

Unquote

 

Quote

 

I drained the transmission and filled it with Redline Brand MTL.

The difference was amazing — the grinding all but disappeared. I still

occasionally experience it when racing very hard (on a closed

course), but for the most part it is gone. That is even after 70,000

miles of grinding (I bought the car with 48,000 miles on it).

In any event, the gear grinding is one of the Z’s more serious

problems, and it is not easily repaired. If I were more financially fortunate

I would probably buy a new transmission. If you have the

grinding problem, I recommend trying the Redline MTL Synthetic

transmission lubricant.

 

Unquote

Had a chuckle at the most recent 2 bulletins

 

99-020C FEB 03 Vehicle - Flat Towing Recommendations

00-056B NOV 02 A/T - Mandatory Oil Cooler Cleaning

 

Says it all really - these cars are getting on a bit so now comes the crap in the transmission oil cooler followed by the tow truck if you dont deal with it!