Show full size 924Board.org
Discussion Forum of 924.org
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
 Technical FAQ924 FAQ (Technical)   Technical924 Technical Section   Jump to 924.org924.org   Jump to PCA 924 Registry924 Registry

New main bearings manufacturing
Goto page Previous  1, 2, 3, 4, 5
 
Post new topic   Reply to topic    924Board.org Forum Index -> General Discussions
View previous topic :: View next topic  
Author Message
safe  



Joined: 18 Mar 2017
Posts: 588
Location: Sweden
PostPosted: Mon Sep 05, 2022 11:28 pm    Post subject: Reply with quote
MikeJinCO wrote:
Not intending to be critical of anyone, when we were assembling one of my motors with the EBS/Chinese bearings the thrust bearing was too tight and jammed the crank. The machinist said that about 30-40% of the motors he puts together have this problem and he really prefers it that way as he can easily rework the thrust washer face to the clearance he wants. I've seen him working on everything from small turbo Audi/VW's to 12 cyl Caterpillar 12l stuff.


Its well beyond my skills to cut a bearing apart and reweld them again...

Edit:
To illustrate the issue. No need to measure really but its about 0.3mm of slop and the old bearings are tight.

https://youtu.be/-xrl0XR8Spg

Really a bearing should fit 100% perfectly without any modifications, it it doesn't its junk, doesn't matter how well its designed if it cant be produced to specification.
There is no way to "correct" this other than jb-weld it in place and grind the crank to fit, but that is not a good option.
This is just the most visual flaw if you measure the thickness of the shells they vary over the shell specially near where the tang is pressed in.

If no one else has complained, I would assume that not a lot of them have been installed yet and if they have, probably just been slammed together without checking basic stuff . It'll wear in... no worries...
_________________
/Magnus, Stockholm Sweden
=======================
Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe
Back to top
View user's profile Send private message
Fifty50Plus  



Joined: 28 Feb 2008
Posts: 1356
Location: Washington DC area
PostPosted: Wed Sep 07, 2022 3:04 am    Post subject: Reply with quote
Wow, I just looked at the UTube video That sideways slop is not acceptable and not fixable by trying to do something to the bearing. Customers should get their money back.
_________________
1979 924 NA race car
1982 924 NA race car - Sold
1982 924 Turbo almost a PoS
1981 924 Turbo a real PoS, new engine
1982 924 Turbo nice body, blown engine
1972 911 E race car - going to Vintage
Various 944s to become IT-S race car
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    924Board.org Forum Index -> General Discussions All times are GMT + 10 Hours
Goto page Previous  1, 2, 3, 4, 5
Page 5 of 5

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group