Broken Crank Angle Sensor Alignment Pin Fix - RB26 - CAS

R34 and R32/R33 CAS

R34 and R32/R33 CAS

The crank angle sensor on an RB series engine is driven from the exhaust camshaft.  The RB20,RB25, RB26, and VG30 all use the same type of splined drive, with a half moon alignment.   This half moon to align the CAS can be broken when people run the engine without a front cover, and no washers to space the cas properly.  

IMPORTANT NOTE. The RB CAS IS 180 OUT FROM THE Z CAS.  Thanks Darrell for that information.  So make sure you mark/make sure where the flat/half moon should be, prior to replacing it. 

Nissan doesn't sell the CAS alignment pin separately, but Jim Wolf Technology does.   So if you pulled your CAS off to paint the front cover, put that cool clear cover on, or to actually do work to the engine, and now it pops, backfires, and won't start, you may be missing the 1/2 moon alignment pin. 

JWT CHROMOLY CAS DRIVE PIN Fits RB26

VG30DE(TT) JWT CHROMOLY CAS DRIVE PIN. A WORN CAS DRIVE PIN CAN CAUSE IGNITION TIMING TO WANDER UNPREDICTABLY. IRONICALLY, THIS IS A WEARING PART OF THE VG30DE ENGINE, YET NISSAN HAS NEVER CHOSE TO SELL IT SEPARATE. YOU NEED TO BUY THE COMPLETE CAMSHAFT TO GET IT! JWT OFFERS THIS CHROMOLY CAS DRIVE PIN SEPARATELY AND IS THE SAME PART CURRENTLY SUPPLIED WITH ALL JWT BILLET CAMS FOR THE VG30DE(TT)

FITS:
300ZX (Z32), ENGINE SPECIFIC, J30,


ENGINES:
VG30DE, VG30DETT, RB20,25,26 DE(T),


ENGINES:
VG30DE, VG30DETT, RB20,25,26 DE(T),

IMPORTANT NOTE. The RB CAS IS 180 OUT FROM THE Z CAS.  Thanks Darrell for that information.  So make sure you mark/make sure where the flat/half moon should be, prior to replacing it. 

Installation Instructions for Jim Wolf Technology Crank Angle Sensor drive pin replacement. 

• Cam Timing
• Camshaft Clearance
• Ignition Timing

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Crank Angle Sensor Rebuilds in the US (CAS)

Crank Angle Sensor Rebuilds in the US (CAS)

John offers a service to rebuild/repair the crank angle sensor for your RB series engine.   We had him rebuild a couple for us. If you want to get another 25 years of life out of your crank- not cam angle sensor, then John can do them for you. 

Offering CAS sensor rebuilds for $125 flat rate each.

This includes checking initial function, light soda blasting, opening and cleaning, replacing bearings, resealing CAS, new orings, and confirming function once I've got it back together, and finally shipping back to you. All included for the $125.

For another $75 I will reassemble the CAS with an AEM 24-1 disk (if your CAS will support it, not all will) for use with aftermarket ECUs. I supply and install the AEM disk for that $75.

I was doing them for $100, but it's too much labor to justify that cost, as you all seem to like to send me the most corroded nasty CAS sensors your can find in the ocean.

Center two are rebuilt, outer two are not.

Also have plenty of repair parts if there is something horribly wrong with your CAS and it needs a disk or something.

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Nissan Skyline Crank Angle Sensors : CAS

R34 CAS on the left, R32/R33 on the right

Nissan CAS or crank angle sensor is a crankshaft position sensor driven from the exhaust cam. The CAS sometimes accidentally called a cam angle sensor, has an optical wheel inside that is driven at 1/2 crank speed.  It has two sets of slots inside. One set is 360 one for each degree. The other set of slots is 6 or one for every 120 degrees of crank rotation. You will often see the signals labeled as the 1 and 120 signals.   The CAS allows you to adjust base ignition timing on an RB engine.    There are several different part's and part numbers for them.  There are Mitsubishi and Hitachi sensors.  There even a couple of shapes of the R32/R33 sensor.  The late R32, and early R33 sensors had a slightly different shape than the early R32, and R33 later sensors that were all the same.

RB26 Hitachi Crank Angle sensor.  

The Mitsubishi and Hitachi crank angle sensors are interchangeable between R32/R33 GT-R.  You don't have to replace them with the same sensor. Just the look is different.

Crank Angle Sensor Part Numbers

There are three different CAS, two are functionally identical but look different. The early cars R32 89-93 ish got Mitsubishi sensors. Then for some wild amount of time in there, they got Hitachi sensors for the 93/94 and early 1995 cars. Then it was back to Mitsubishi. I don't really care enough to be exact, as the function seems to be the same.  The R34 CAS has a plastic cover and is both driven, and signals come out on different pins. 

CAS gasket - IMPORTANT to space the CAS correctly. 13525-58S00

R32/R33

23731-02U11

 - Mitsubishi

23731-08U00 - Hitachi 

R32 GT-R with timing anti tamper tape applied

R34 cam angle sensor

23731-5L300

Notice the drive on the R34 CAS on the left, and the R32/R33 on the left

CAS Wiring

R32/R33 

Pin 41  120 Signal

Pin  42 1 Signal

Pin 51 120 Signal

Pin  52 1 Signal

R34

Pin 41 1 Signal

Pin 42 120 Signal

Pin 51 Blank

Pin 52 120 Signal

R34 GT-R ECU pinout or wiring diagram for computer

Other options:

Other options involve not getting the crank position from the cam gear.  The problem with getting the reading at the cam is that the belt stretches and flexes a little bit.  Add in the wheel inside the CAS fluttering a little, and having 360 little, teeny, tiny slots, you can get some crank/ignition timing errors.  If you have a stock car, at stock power, the OEM CAS works fine. If you are making 1000 hp, turning 10,000 rpm, then you need to go to a crank pickup.

With a crank pickup, you also need what is called a 1 signal. Since the crankshaft spins around 720 degrees, or two turns in every complete combustion cycle, the ECU needs to know when it is at top dead center (TDC) on #1 cylinder during the compression stroke, to fire the spark plug.

In recent years, lots of companies have come up with kits to read the crank position.  Here are a few.

Nissan RB (Twin Cam) Crank/ Cam Trigger Kit from Ross Performance

Kit includes the following:

• Nissan RB Harmonic Damper with 12 or 36-2 Tooth Integrated Trigger Disc
• Nissan RB Crank Angle Sensor Mount (306000-75) OR Nissan RB Crank Angle Sensor Mount to Suit Girdle (306000-75-SP1) SP1 mounting spigots are 10mm shorter than standard.
• Nissan RB Cam Angle Sensor Mount (306000-74)
• Nissan RB Twin Cam Trigger (306000-73)
• Honeywell GT101 Hall Effect Sensors (992GT101) OR Cherry Hall Effect Sensors (992CHERRY)

This Kit is designed to suit the following engines; Nissan RB20DET, Nissan RB25 NEO, Nissan RB25 R33, Nissan RB26 R32 GTR, Nissan RB26 R33 GTR and Nissan RB26 R34 GTR

https://rossperformanceparts.com/product/nissan-rb-twin-cam-crank-cam-trigger-kit/

Trigger Systems Tech

Honeywell GT1010 Hall Effect Sensor Specifications

Cherry Hall Effect Sensor Specifications

Platnium Racing Products Trigger kit

Platinum Racing Products have a number of RB trigger kits available.  Here is one option, pictured above.

Complete Trigger Kit Minus CAS Bracket – RB Series

This RB Trigger kit has evolved, through research and development to offer precision ignition timing, for high powered and high RPM applications.

We have re developed the bottom timing gear with trigger disc to be one piece, this disallows a screwed on trigger disc to ever come loose.
This custom made gear will work with all and any balancer.
The cherry hall effect magnetic pickup timing gear sensor is now the industry benchmark, the cam sensor bracket is light and simple and incorporates the use of a smaller more discreet cherry sensor.

Design Features:

• Engineered timing gear with incorporated trigger disc.
• Gear works with any known balancer.
• Custom colours available upon request.
• Bolt kit included.
• Lifetime warranty on all Platinum Racing Products hardware.

For the full list of options, check out the PRP site.   

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RB26DETT Ignition Timing Adjustment and TDC Check

Setting ignition timing is very important in making sure an engine runs correctly. A Nissan Skyline GT-R RB26 engine normal ignition timing is 20BTDC, or 20 degrees before top dead center.  The sensor on the exhaust camshaft is normally called a crank angle sensor(CAS) even though it is driven off the camshaft.  If the CAS is anywhere but in the middle of its range, you should be questioning why it is in that position.  Not every timing light reads timing on a coil on plug RB26DETT correctly, so if it seems 40 degrees off, try flipping the pickup wire over. Watch video at the end of this post.

If flipping it over doesn't work, you might want to put a spark plug wire on #1 coil, and get your reading there. 

Finding Top Dead Center or TDC

R34 CAS. Ignition timing is very advanced. This is not normal. 

CAS set correctly with anti tamper seal

R34 CAS on the left, R32/R33 on the right

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