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 )

> Silverline bearing out of round
cgnj
post Mar 6 2024, 08:56 PM
Post #1


Senior Member
***

Group: Members
Posts: 627
Joined: 6-March 03
From: Medford, NJ
Member No.: 403
Region Association: None



Just spoke to machinist today. Bearing 4 out of round. These are Silverline bearings. I'm thinking time to go German.

Anyone else have a similar problem?

User is online!Profile CardPM
Go to the top of the page
+Quote Post
 
Reply to this topicStart new topic
Replies
930cabman
post Mar 7 2024, 05:55 AM
Post #2


Advanced Member
****

Group: Members
Posts: 3,141
Joined: 12-November 20
From: Buffalo
Member No.: 24,877
Region Association: North East States



QUOTE(cgnj @ Mar 6 2024, 09:56 PM) *

Just spoke to machinist today. Bearing 4 out of round. These are Silverline bearings. I'm thinking time to go German.

Anyone else have a similar problem?


Is it possible the machinist is out of round?
User is online!Profile CardPM
Go to the top of the page
+Quote Post
Superhawk996
post Mar 7 2024, 07:49 AM
Post #3


914 Guru
*****

Group: Members
Posts: 5,888
Joined: 25-August 18
From: Woods of N. Idaho
Member No.: 22,428
Region Association: Galt's Gulch



QUOTE(930cabman @ Mar 7 2024, 07:55 AM) *

QUOTE(cgnj @ Mar 6 2024, 09:56 PM) *

Just spoke to machinist today. Bearing 4 out of round. These are Silverline bearings. I'm thinking time to go German.

Anyone else have a similar problem?


Is it possible the machinist is out of round?

(IMG:style_emoticons/default/laugh.gif)

You haven’t provided enough info to help you. It very well could be your machinist (IMG:style_emoticons/default/confused24.gif)

Split Bearings aren’t round and uniform thickness all the way around by design.

Likewise even a full round bearing like #4 will have a tiny bit of an interference or tight “push” fit into the case to help keep it from spinning along with the dowel pin. I’m not taking about any significant force but they won’t just drop in perfectly freely either.

Likewise, it could be the bearing bore isn’t round. Especially if case has bearing saddles that are hammered out and/or needing a line bore.

What is he using to base his decision off that the bearings are not round? If he’s using the crank itself as a gauge, has the crank journal been double and triple checked? Any sign of shipping damage or deformation to the bearing itself? Too many what if’s, not enough info to help.

Attached Image
User is online!Profile CardPM
Go to the top of the page
+Quote Post

Posts in this topic


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

 



- Lo-Fi Version Time is now: 5th June 2024 - 12:46 PM