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Friday, November 13, 2015

Push vs Pull Clutch : Nissan Skyline GT-R Clutches


What style of clutch is this? 
Here is a question we get fairly often.  Push vs Pull clutch. What is the difference? What type of clutch is on my car? Why did Nissan switch from push to pull clutch? Why are most aftermarket clutches push?

If you are like us, at one point in your Skyline GT-R life, you needed a clutch. A couple too many 8,000 rpm off the limiter launches, and whatever is in there is done.  So you look up clutches, and pick one out, but the question comes up, is it a push or pull?

Push or pull refers to the action to release the clutch.  A push clutch, does just that, pushes on the disk cover or diaphragm, to release pressure on the disks, so the center is disengaged from the engine. A pull clutch pulls on the diaphragm to release pressure on the disks.

The early Nissan Skyline GT-R's are all push clutches.  You can identify the clutch itself by the clutch cover.  If it has open fingers, then its a push. If it has a ring, then its a pull.

Push style clutch. This is a Tilton carbon/carbon triple plate for a Nissan Skyline GT-R
Pull style clutch. This Nismo is made by Exedy, a twin plate, and in this case for a Getrag transmission

So which is better?  This is what Daikin/ Exedy has to say about push vs pull


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So why isn't every clutch pull? Some of it is complexity. Costs. What we have also heard, is it is because of patents. Daikin/ Exedy has the patents on the technology, so not everyone uses it.  I have seen people drill holes in their bell housing to release a pull style clutch. If the transmission comes off the engine, and stops hard at about an inch, then you probably need to release the throw out bearing. Its really not that hard. Watch the video below for instructions.

How to remove a pull style throwout bearing in a late R32,R33, or R34 Nissan Skyline GT-R transmission. Watch the video. Its easy when you know how. 

How do you identify what clutch actuation your car has in it? If your car is a 1989-1992, then it should be a push style clutch.   Later than February 3rd, 1993, it should be a pull clutch. Key words always being "SHOULD".While it is possible to change push to pull and vice versa, its not something you want to figure out when the car is on a lift.

02/03/'93 Minor change Late model. V-spec added
Rear diff cover fin removed
Clutch modified (push -> pull)
Synchronizers modified
Brembo caliper added(V-spec)
ETS program modified(V-spec)
Tires changed (V-spec: 225/50-17)
BBS mesh special wheel (V-spec)
# N1 model gets to based on V-spec

As with anything on a car that is over 20 years old, it has probably had a clutch change at some point. So its always best to check.  Follow the pictures below for some help identifying what you have.

Getrag with a conversion kit for an ATS carbon clutch
In the above picture, the slave cylinder is on the backside of the shift fork.  As originally placed this is a pull clutch. Now with the slave flipped to the new position, this becomes a push clutch actuation. .



Some of the R32/R33 bellhousings have bosses/are drilled for both style slave cylinders.

The parts required for a pull to push conversion.

Clutch Pull to push conversion-
Late Model R32, R33
Front cover assembly :32110-05U11 (japan part only)
Gasket :32112-05U12
Clutch fork :30531-01S00 (same part for a 1991-1993 240SX)
Spring :30514-14600
Spring :30534-E9000
T/O bearing :30502-14601
Bearing sleeve:30501-S0160 / 30501-N1601 (14mm for twin / trip disc)
Bearing sleeve: 30501-K0404 (24mm for single disc)
Dust cover :30542-31610
Slave cylinder :30620-21U01
Flywheel bolt: 12315-04U00

 In addition to push and pull clutch actuation via slave cylinder and fork, there are also converters sold that go inside the trans, and hydraulic release (slave) bearings.

OS Giken clutch actuation conversion kit



Getrag converted to push clutch actuation

Getrag converted to push clutch actuation



Another push style triple plate clutch. 


Front cover. Notice the fork pivot. Its a ball on early R32.



Factory Clutch
R32 GTR(There are early and late R32, so double check this)
Disc- C0100-05U15
Cover-30210 - 05U01
Bearing- 30502-21000
R33 GTS
Disc- 30100-21U01
Cover- 30210-21U00
Throw out bearing- 30502-12U00 (300ZX part) or 30502-45P00 (300ZX part)
Bearing Sleeve- 30501-S0200 (18mm)
R33 GTR
Disc- 30100-0V708
Cover- 30210-24U00
Bearing- 30502-12U00
R34 GTR
Disc- 30100-0V708
Cover-30210 - AA300
Bearing- 30502-12U00


Throw Out Bearing Sleeves


Depending on what clutch, and flywheel you are running, you may need a new throw out bearing sleeve for the early, push style clutches. The height listed is from the front side of the fork to the seat position of the bearing.

30501-22102 8mm
30501-B5000 10mm
30501-A3800 12mm
30501-N1601 14mm
30501-U0200 16mm
30501-S0200 18mm
30501-B6000 20mm
30501-S0160 22mm
30501-K0404 24mm
30501-K0510 26mm
30501-N1600 28mm
30501-N8400 30mm



NISMO R32 GT-R Clutch Change Time Lapse Video.

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