Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

 
 Reply to this topicStart new topic
> Tranny Shims (gaskets), Thickness
2-OH!
post Feb 26 2004, 09:10 AM
Post #1


Senior Member
***

Group: Members
Posts: 552
Joined: 17-October 03
From: Santa Clarita, Kalifornication
Member No.: 1,253
1975 2.0 901 standard tranny...Three shims currently installed

I measure the three shims (gaskets) between the intermediate case and the tranny case...Measured individually and together, the total thickness as measured by a michrometer is .012...Converted to mm's that comes out to be .30 mm's...

The gaskets come in three thicknesses, 1.mm, 1.5mm, and 2.0mm's...

I can't get there from here...Where am I going wrong with my math...

In the first place, these gaskets are paper thin, noway they are 1, 1.5 or 2 mm's thick... so I am thinking it's a sneaky european trick with the decimal points...

Any help out there...

2-OH!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Demick
post Feb 26 2004, 09:24 AM
Post #2


Ernie made me do it!
****

Group: Benefactors
Posts: 2,312
Joined: 6-February 03
From: Pleasanton, CA
Member No.: 257
Yep. Missed a decimal place.

If I remember correctly, the three thicknesses are about .004, .006, and .008 inches thick. This corresponds to about .1mm .15mm and .2mm

Demick
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bleyseng
post Feb 26 2004, 09:37 AM
Post #3


Aircooled Baby!
**********

Group: Members
Posts: 13,034
Joined: 27-December 02
From: Seattle, Washington (for now)
Member No.: 24
Region Association: Pacific Northwest
Try to figure out what color the shims were, pink, green or tan. Match them to the old ones. yes of course they are old and full of tranny oil and its hard to tell but its the easiest way to do this.

Geoff
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
2-OH!
post Feb 26 2004, 10:52 AM
Post #4


Senior Member
***

Group: Members
Posts: 552
Joined: 17-October 03
From: Santa Clarita, Kalifornication
Member No.: 1,253
I don't think color will work, I got a 1.mm, 1.5mm already and they are both tan...

But, I think I will assume the decimal is in the wrong spot, move it one place to the left and everything works out ok (mathmatically) ...

What happens if I get it wrong and miss the total measurement by .004 or .006...Will the transmission not shift, slip, not mesh, explode, grind itself to death, etc...

2-OH!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Brad Roberts
post Feb 26 2004, 04:41 PM
Post #5


914 Freak!
***************

Group: Members
Posts: 19,148
Joined: 23-December 02
Member No.: 8
Region Association: None
They CRUSH when you crank it down. Go by the colors. The internal shims set the real crucial number. The gaskets need to be replaced with the same color. Dont freak out about it.. just use the same colors. You will be fine. I'm sure your pinion bearing has more play in it than those gaskets can compensate for.



B
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
2-OH!
post Feb 26 2004, 05:48 PM
Post #6


Senior Member
***

Group: Members
Posts: 552
Joined: 17-October 03
From: Santa Clarita, Kalifornication
Member No.: 1,253
Thanks guys,

I just ordered three "tan" because I think the tans are .1mm...When I mich out the old ones they come to .30mm and they appear to have been tan some 30 years ago...Therefore three .1's...There were three gaskets (shims) installed originally...

I now just hope I got the measurement between the reverse idler gear and the 1st gear slider correct...

2-OH!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Brad Roberts
post Feb 26 2004, 07:09 PM
Post #7


914 Freak!
***************

Group: Members
Posts: 19,148
Joined: 23-December 02
Member No.: 8
Region Association: None
Im betting somebody has been in that tranny before. Did it have 2 tans and one green ?? That is exactly what comes in the gasket kits you buy for rebuilding a tranny.


B
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
brant
post Feb 26 2004, 07:11 PM
Post #8


914 Wizard
**********

Group: Members
Posts: 11,622
Joined: 30-December 02
From: Colorado
Member No.: 47
Region Association: Rocky Mountains
what is the measurement supposed to be for the slider - reverse idler?

brant
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Brad Roberts
post Feb 26 2004, 07:14 PM
Post #9


914 Freak!
***************

Group: Members
Posts: 19,148
Joined: 23-December 02
Member No.: 8
Region Association: None
It is in the Haynes book.. but I dont go by it. I set the slider to engage first cleanly.. This makes the clearance acceptable for the reverse idle. I also mark the shift fork on the shaft before removal..


B
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
TimT
post Feb 26 2004, 07:58 PM
Post #10


retired
****

Group: Members
Posts: 4,033
Joined: 18-February 03
From: Wantagh, NY
Member No.: 313
Did you pull the diff out?

well actually doesnt matter

if you have havent effed with th diff

bolt everything up... smear some prussian blue, or white lithium grease on the ring gear and rotate the tranny a coupla times....

unbolt the dif and check the "shmear" look for a nice pattern on the ring gear.. should be halfway between the top and bottom of the gear tooth..

The intermediate housing gaskets affect this... the shims on your diff affect this also

what you want is a nice pattern on the ring gear..

If you get it f$%^% up you just have a whining tranny...
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Brad Roberts
post Feb 26 2004, 08:04 PM
Post #11


914 Freak!
***************

Group: Members
Posts: 19,148
Joined: 23-December 02
Member No.: 8
Region Association: None
OH.. something that has NOT been brought up in public..

Make damn sure you thread the studs BACK into the case after you have everything out.

After removal a few times the studs start unthreading each time. Very few (if any) speak about this.

Basically.. run them back into the case by grabbing them somehow or double nutting them. YOu can see the backside of the threaded hole in the case. Run the stud back in until it goes at least flush with the tranny.

I know several tranny builders who run longer studs and install nuts on the case end of the studs for added protection.

Last thing you want is a stud pulling out of the tranny case... also.. only torque the NYLOCKS you are going to use to 10lb ft

B
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
2-OH!
post Feb 26 2004, 09:42 PM
Post #12


Senior Member
***

Group: Members
Posts: 552
Joined: 17-October 03
From: Santa Clarita, Kalifornication
Member No.: 1,253
[QUOTE]I set the slider to engage first cleanly..

Brad,

Can you give me a little more definition on how you do this...Haynes is very vague and leaves a lot out...

2-OH!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 9th May 2024 - 09:18 PM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...