Diff gear contact pattern pictures - Defender Source
Defender Source  

Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions


Reply
 
Thread Tools
  #1  
Old September 7th, 2015, 04:32 PM
cgalpin's Avatar
cgalpin
Status: Offline
Charles Galpin
'94 D90 ST, '63 SeriesIIA
Site Team
 
Join Date: Jan 2004
Location: South Riding, VA
Posts: 11,623
Registry
Diff gear contact pattern pictures

I'm not confident in my gear contact pattern, but I can't find any decent *real* pictures of a good gear pattern. Everything that I have read implies the contact pattern should be shorter and fatter than I ever see.

Anyone want to share the pictures of their contact pattern when they set them up? know you have them.

Here is where mine are right now.

The gear side looks fairly well centered to me, heel to toe as well as root to top. But looks like a skinnier contact patter
Click image for larger version

Name:	IMG_3151.jpg
Views:	148
Size:	83.6 KB
ID:	129018

The coast side looks centered foot to top but too far on the heel side
Click image for larger version

Name:	IMG_3152.jpg
Views:	133
Size:	89.5 KB
ID:	129019
__________________
Quote:
Originally Posted by pendy
I'm here for the D's
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old September 7th, 2015, 04:46 PM
Rocky's Avatar
Rocky
Status: Offline
Chris
72 + D1 drivetrain
Member
 
Join Date: Sep 2006
Location: Colonies Aka Boston
Posts: 8,762
Bookmarked this along time ago.

God knows why.....Never done it.....
https://www.ringpinion.com/Content/B...h-Patterns.pdf
Reply With Quote
  #3  
Old September 7th, 2015, 04:47 PM
leastonce's Avatar
leastonce
Status: Offline
Jason England
D-90 White 95 SW #65
Site Team
 
Join Date: Jul 2009
Location: NYC
Posts: 6,078
Registry
ring and pinion install
__________________
Quote:
Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
Car Camping Collective founding member and Chief Executive Officer
Cat Camping Collective founding member and Chief Executive Officer
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old September 7th, 2015, 05:30 PM
cgalpin's Avatar
cgalpin
Status: Offline
Charles Galpin
'94 D90 ST, '63 SeriesIIA
Site Team
 
Join Date: Jan 2004
Location: South Riding, VA
Posts: 11,623
Registry
Quote:
Originally Posted by Rocky View Post
Bookmarked this along time ago.

God knows why.....Never done it.....
https://www.ringpinion.com/Content/B...h-Patterns.pdf
Thanks. Seen this one and it's a good example of the illustration making me wonder if it matches reality. I don't care for the "acceptable patterns" list though - seems to too broad. To me the top two are the only acceptable ones.

Quote:
Originally Posted by leastonce View Post
Nice shots thanks, and that's what I want to see on mine. I guess I could try the yellow paste, or work on my prussian blue application technique, but I can't get anything that clear and definitive.

I'd also like to see pics from rover diffs.
__________________
Quote:
Originally Posted by pendy
I'm here for the D's
Reply With Quote
  #5  
Old September 7th, 2015, 09:35 PM
airbornrover's Avatar
airbornrover
Status: Offline
William Skidmore
SIII 109 SW
Member
 
Join Date: Oct 2004
Location: Land by parkway and 33
Posts: 1,882
Why not just use some crayons, melt them down and apply. I think lipstick works as well?
__________________
Quote:
Just to be clear, i was not bragging. i was calling you a pussy. Ren Ching
There is nothing as permanent as a temporary fix. JSBriggs
Reply With Quote
  #6  
Old September 7th, 2015, 09:55 PM
fishEH's Avatar
fishEH
Status: Offline
Brett Fritzler
94, 95, 96 D1's
Member
 
Join Date: Mar 2011
Location: Lake Villa, IL
Posts: 1,113
Prussian Blue sucks. Less is more with it in my opinion.
Reply With Quote
  #7  
Old September 8th, 2015, 05:35 AM
Antichrist's Avatar
Antichrist
Status: Offline
Tom Rowe
Defender/Disco/Series/MoD
Member
 
Join Date: Feb 2006
Location: Atlanta, GA USA
Posts: 1,280
I don't know why they left it out of the coiler manuals, but the series workshop manual has the contact patterns illustrated in them in the diff rebuild section.
__________________
Tom Rowe
Atlanta, GA

Four wheel drive allows you to get stuck
in places even more inaccessible.

62 88 Regular
67 109 6cyl NADA x2
74 Lightweight - The Antichrist
95 DI 5-speed
95 D90 5-speed
97 D1 Automatic
Reply With Quote
  #8  
Old September 8th, 2015, 07:14 AM
sonoronos's Avatar
sonoronos
Status: Online
Ed
None
Member
 
Join Date: May 2010
Location: Arlington, VA
Posts: 5,523
Registry
It would be good to get photos or feedback from someone who has actually done a rover diff.

I don't think the issue here is that Charles hasn't exhaustively researched what a "good" ideal pattern is.

The questions as I understand them are:

1. Regardless of what all the internet guides and tech manuals say, why is it consistently impossible to get an "island" contact patch vs a long skinny contact patch on a rover diff?

2. Assuming #1 is false above (it IS possible to get an island contact patch) how does one specifically and without ambiguity actually get there?

Charles - your pattern is similar to mine. I set mine to long/narrow strip but centered as much as possible on the drive side (i could not get an island) and a little bit towards the heel on coast. I was frustrated because the pattern did not match the literally dozens on internet guides and photos I found. This is the contact pattern I am running now.
Reply With Quote
  #9  
Old September 8th, 2015, 12:17 PM
1of40's Avatar
1of40
Status: Offline
1of40
NAS 97SW & 83 One Ten Tdi
Member
 
Join Date: Dec 2003
Location: Potomac Falls & Wintergreen, Virginia
Posts: 6,075
Registry
Charles, I have a third out at the moment that was set up by GBR if it would be of any help to see. Happy to bring it by Tues or Wednesday after work to compare.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote
  #10  
Old September 8th, 2015, 02:55 PM
psykokid
Status: Offline
Jake
1997 Disco
Member
 
Join Date: Oct 2011
Location: Pasadena, CA
Posts: 523
Generic yellow Oil paint for canvas works great as well, easier to see the contact pattern than with prussian blue..
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote
  #11  
Old September 8th, 2015, 08:57 PM
cgalpin's Avatar
cgalpin
Status: Offline
Charles Galpin
'94 D90 ST, '63 SeriesIIA
Site Team
 
Join Date: Jan 2004
Location: South Riding, VA
Posts: 11,623
Registry
Thanks guys. I have some yellow gear marking paste on the way, so I'll try it before breaking out the lipstick.

Ed hit the nail on the head. Last time I tried this I could never get the results I wanted to see and sent them to GBR. I want to get it right this time on my own and it would sure help to see real rover results.

Clay, that would be awesome. I wish I had taken the time to check and take good pictures of mine when GBR did them. If we could try on yours that would be awesome. Or HH even.
__________________
Quote:
Originally Posted by pendy
I'm here for the D's
Reply With Quote
  #12  
Old September 9th, 2015, 08:04 AM
1of40's Avatar
1of40
Status: Offline
1of40
NAS 97SW & 83 One Ten Tdi
Member
 
Join Date: Dec 2003
Location: Potomac Falls & Wintergreen, Virginia
Posts: 6,075
Registry
Charles, I'll drop off the diff after work tonight. I forgot I need to be in Sterling for football practice tonight and have a game Thursday night(s).

Would you mind if I also drop off a pair of wheels I'm RURR'n between Bang and Pedro? I can't make HH next week and I think he was hoping to get them next week at HH.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote
  #13  
Old September 9th, 2015, 05:29 PM
cgalpin's Avatar
cgalpin
Status: Offline
Charles Galpin
'94 D90 ST, '63 SeriesIIA
Site Team
 
Join Date: Jan 2004
Location: South Riding, VA
Posts: 11,623
Registry
Sure, no problem.
__________________
Quote:
Originally Posted by pendy
I'm here for the D's
Reply With Quote
  #14  
Old September 10th, 2015, 03:13 PM
Nomar's Avatar
Nomar
Status: Offline
Jeff B
RR HNTR,RR LWB Tdi
Member
 
Join Date: Aug 2004
Location: Central,Virginia
Posts: 4,288
Registry
Quote:
Originally Posted by 1of40 View Post
..... I forgot I need to be in Sterling for football practice tonight and have a game Thursday night(s).

.
Aren't you too old to be playing football? Leave that to the kids!


.
__________________


Real Rovers have round headlights!
Rent my
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
!
Just a few miles from 4x4 access!
Reply With Quote
  #15  
Old September 10th, 2015, 03:32 PM
Roadsiderob's Avatar
Roadsiderob
Status: Offline
Robert Dassler
1994 D90
D-90 Source Vendor
 
Join Date: Apr 2004
Location: Albuquerque, NM, USA
Posts: 994
i use GM yellow gear paint....available from your GM dealer. Apply with an old toothbrush. Also, remember, rover diffs are spiral bevel gears, not hypoid. The pinion contacts the ring gear in the center rather than being offset. If you're looking at pictures of gear contact patterns for hypoid gears, you'll never get yours to look like that no matter how you shim them. Go by the patterns in the Rover shop manual.
__________________
Rob Dassler
SWR Automotive
505-872-7818 (shop)
Reply With Quote
  #16  
Old September 10th, 2015, 03:47 PM
1of40's Avatar
1of40
Status: Offline
1of40
NAS 97SW & 83 One Ten Tdi
Member
 
Join Date: Dec 2003
Location: Potomac Falls & Wintergreen, Virginia
Posts: 6,075
Registry
Quote:
Originally Posted by Nomar View Post
Aren't you too old to be playing football? Leave that to the kids! .
Don't I know it. Ha! Even coaching these 13-14 year old knuckleheads makes me sore. Can't wait until next year. My youngest will be in HS and I'll have spring and fall evenings free again. Your tax $ will be paying for my kid to play sports Bang. .
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote
  #17  
Old September 12th, 2015, 12:57 PM
cgalpin's Avatar
cgalpin
Status: Offline
Charles Galpin
'94 D90 ST, '63 SeriesIIA
Site Team
 
Join Date: Jan 2004
Location: South Riding, VA
Posts: 11,623
Registry
Thanks for the feedback everyone. Rob, I think mine looks decent compared to the pictures in the series repair manual.

Here are pics of mine right now using yellow paste - it makes it a lot easier to see the pattern

Click image for larger version

Name:	IMG_3154.jpg
Views:	85
Size:	46.9 KB
ID:	129586 Click image for larger version

Name:	IMG_3162.jpg
Views:	92
Size:	76.8 KB
ID:	129593 Click image for larger version

Name:	IMG_3159.jpg
Views:	88
Size:	82.0 KB
ID:	129590

Click image for larger version

Name:	IMG_3155.jpg
Views:	74
Size:	66.9 KB
ID:	129587

And for comparison here is a high mileage diff (4.11 i believe) which has given years of great service

Click image for larger version

Name:	IMG_3156.jpg
Views:	86
Size:	61.8 KB
ID:	129588 Click image for larger version

Name:	IMG_3157.jpg
Views:	72
Size:	128.7 KB
ID:	129589

And my spare 4.11 of unknown heritage

Click image for larger version

Name:	IMG_3161.jpg
Views:	74
Size:	70.9 KB
ID:	129592 Click image for larger version

Name:	IMG_3160.jpg
Views:	96
Size:	84.8 KB
ID:	129591

I kind of like that pattern drive side pattern.

Anyway, I think I'm going to go with what I have for the pinion height and press in my pinion race and set the preload up properly and see how they look after that.
__________________
Quote:
Originally Posted by pendy
I'm here for the D's
Reply With Quote
  #18  
Old September 13th, 2015, 12:24 PM
cgalpin's Avatar
cgalpin
Status: Offline
Charles Galpin
'94 D90 ST, '63 SeriesIIA
Site Team
 
Join Date: Jan 2004
Location: South Riding, VA
Posts: 11,623
Registry
So the end state of my front (HD reverse cut) diff looks like this:

Click image for larger version

Name:	IMG_3163.jpg
Views:	68
Size:	73.0 KB
ID:	129648 Click image for larger version

Name:	IMG_3164.jpg
Views:	65
Size:	69.1 KB
ID:	129649 Click image for larger version

Name:	IMG_3165.jpg
Views:	78
Size:	74.3 KB
ID:	129650
Click image for larger version

Name:	IMG_3166.jpg
Views:	71
Size:	72.4 KB
ID:	129651 Click image for larger version

Name:	IMG_3167.jpg
Views:	73
Size:	73.8 KB
ID:	129652 Click image for larger version

Name:	IMG_3168.jpg
Views:	94
Size:	66.2 KB
ID:	129653

I got this far on the rear. I think today I'll try another shim to lower the pattern a little and call it done but I haven't been able to get it to center or elongate like the front. I'm not sure if this is a difference between the reverse cut and "regular" gear swirl. I guess it looks similar enough to one of the other HD diffs I tested so it's ok, but it doesn't look "perfect" enough for me, whatever that is

Click image for larger version

Name:	IMG_3169.jpg
Views:	70
Size:	70.7 KB
ID:	129654
__________________
Quote:
Originally Posted by pendy
I'm here for the D's
Reply With Quote
  #19  
Old September 13th, 2015, 07:55 PM
cgalpin's Avatar
cgalpin
Status: Offline
Charles Galpin
'94 D90 ST, '63 SeriesIIA
Site Team
 
Join Date: Jan 2004
Location: South Riding, VA
Posts: 11,623
Registry
Here is the end state of my rear diff.

Click image for larger version

Name:	IMG_3180.jpg
Views:	74
Size:	69.0 KB
ID:	129713 Click image for larger version

Name:	IMG_3182.jpg
Views:	68
Size:	59.6 KB
ID:	129715 Click image for larger version

Name:	IMG_3184.jpg
Views:	68
Size:	69.3 KB
ID:	129717

Click image for larger version

Name:	IMG_3181.jpg
Views:	65
Size:	71.6 KB
ID:	129714 Click image for larger version

Name:	IMG_3183.jpg
Views:	72
Size:	76.4 KB
ID:	129716

Unless someone yells nooooooooo, I'm done. Well, I say I'm done, but for some reason I'm having a hell of a time installing the pinion seal on the rear. I've destroyed a seal already so I'll take a break and try again tomorrow. Had no issues on the front, same cortico FTC4939G seal
__________________
Quote:
Originally Posted by pendy
I'm here for the D's
Reply With Quote
  #20  
Old September 13th, 2015, 07:58 PM
sonoronos's Avatar
sonoronos
Status: Online
Ed
None
Member
 
Join Date: May 2010
Location: Arlington, VA
Posts: 5,523
Registry
Looks great charles
Reply With Quote
Reply

Lower Navigation
Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions

Tags
ac

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
FS: Used Defender Mat w/ 5-bar checker plate pattern Chaucer For Sale - Parts 2 March 11th, 2008 10:57 AM
Wheel Bolt Pattern NashvilleRover Defender Technical Discussions 3 October 12th, 2007 11:07 PM
LR3 bolt pattern and wheel studs trailerman Defender Technical Discussions 0 May 27th, 2006 10:32 AM
New tread pattern for BFG MT sheki Misc. Chit-Chat 15 September 16th, 2005 09:16 AM
Bolt Pattern Joe P Defender Technical Discussions 3 December 29th, 2004 11:06 PM


All times are GMT -5. The time now is 08:25 AM.


Copyright