VW 289 d pinion depth tool question

[Jason Eastman]

Can someone offer their opinion of my belief? I'm trying to measure pinion depth of a 741 gearbox. Either the pinion depth is way off or I'm reading the tool incorrectly. I believe the tool diameter is 58.71mm as seen on the tool in the picture. I measured a 2.13mm protrusion. Tool diameter plus protrusion gives me a reading of 60.84. R value on the pinion is 59.12. I did check a gear pattern and found it to be way off as well. Leads me to believe that this is an accurate reading but I need to be confident.

Sorry for the crappy picture but I couldn't get the good one added as its to large to attach here.

VW 289 d Peiseler
Line one IstmaB 107,935
Line two IstmaB 143,39
Line three IstmaB mit Einstellmeister 58,71

[Jacques Lefriant]

Hi Jason you are missing the setting block you will have to fake it by using appropriate blocks under the two pads.
j

[Jason Eastman]

The tool came with a setting block but the first picture cut it off. here is a picture of the setting block by itself

[Jacques Lefriant]

Hi Jason you should be good to go

[Jason Eastman]

o Jacque if I zero the gauge to that block and get a reading of 2.13, I add that to my tool diameter 58.71 for a total of 60.84? If that is true the pinion depth is way way off. Pinion stamping is 59.12. I suspect I'm right after looking at the gear contact pattern

[Jacques Lefriant]

if you set to zero (with block) it should read -(59.12-58.71=.41) when in place or -2.54 the way you are doing it

[Jacques Lefriant]

Hi Jason
do you realize that the indicator has to be preloaded and that you you read it backwards also are you sure you have the pinion shaft properly assembled and you are using 59.80-59.12 or .70 of additional shims. the 59.12 is a Radius not a diameter.
j

[Jon Bunin]

if I zero the gauge to that block and get a reading of 2.13, I add that to my tool diameter 58.71 for a total of 60.84? If that is true the pinion depth is way way off. Pinion stamping is 59.12.

Jason, if you zero'd the gauge on the block, then did both indicator needles reach your zero setting in the transmission, or did they pass your zero setting and clock 2.13 additional times?
If you're reading your indicator and doing your math correctly, 60.84 means that your pinion is 1.72 mm too far away from the desired position, and that your indicator needles never reached your zero setting.
If you left something out of the pinion stack to result in that measurement, I think that the gear cluster would lock up with everything assembled. Is everything assembled & torqued, with both shafts installed? What have you added in pinion shims and gaskets?

[Jason Eastman]

I zeroed the indicator on the block. From there I measured 2.13mm. Everything was assembled and torqued. I have not disassembled the pinion shims as of yet. This is how I found the transmission. I'm here due to a LARGE differential whine.

I read the book again last night. It seems as though Porsche wants the indicator set to 59.00mm instead of zero. This would make it easier to read the indicator as it's easy to get confused.

This is my first time inside of a 356 tranny by myself. I have done pinion depth on 911 gearboxes which is similar depending on the gearbox. The 911 gearbox depending on model uses a blueprint R value of 63.50mm (That'r from memory, I would confirm), from the blue print value the pinion has an engraved N value +/- engraved. This gets added or subtracted from the blueprint value for your specified R value/pinion depth.

Is the 59.00mm that the gauge is set to the blue print value for these transmissions or am I missing something here.

Regardless I have ordered another ring and pinion and will need to see what that value is before setting this transmission up.

[Jacques Lefriant]

Hi Jason
you might want to disassemble the pinion shaft and verify all the dimensions of the washers etc. BTW the new R+P are marked like 911s and the blueprint value is 59.22mm.
j

[Jason Eastman]

Thank you for the help with this Jacque.

[Jon Bunin]

I zeroed the indicator on the block. From there I measured 2.13mm.

Jason, there are two ways to interpret your measurement, as either 2.13mm too close or 2.13mm too far from the zero setting.
That's why I asked if the indicator needles in your gauge reached your zero setting in the transmission, or if they reached and passed your zero setting.

I read the book again last night. It seems as though Porsche wants the indicator set to 59.00mm instead of zero. This would make it easier to read the indicator as it's easy to get confused.
Is the 59.00mm that the gauge is set to the blue print value for these transmissions or am I missing something here.

The 59.00mm dimension in the manual is from an example using the Porsche tool. You're using a Volkswagen tool, so the equivalent dimension in your case would be 58.71mm.
It's a tool dimension, not a transmission or pinion dimension.

[Jason Eastman]

So this transmission pinion was truly off by a mile. There were no shims between the pinion bearing and spacer/thrust washer. I have the new ring and pinion in and setup correctly by the numbers. The gear contact pattern confirms that everything is good too.

I was wondering if you you transmission experts would mind sharing your backlash tool pictures with me? I was able to fashion something that works but could use improvements.

[Jason Eastman]

Sorry for the crappy picture but it was to big to load so I took a crappy cell phone picture of the computer screen

[Eric Wills]

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