Main bearing clearances? |
|
Wednesday, 22 January 2025 |
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. |
|
Main bearing clearances? |
stugray |
Jul 28 2012, 08:56 PM
Post
#1
|
Advanced Member Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
I am getting ready to put my short block together and I have what appears to be a fairly new crank.
Main bearing journals: 2.361. The bearings appear to be new unused STD-STD. When I put on the main bearing that goes directly beneath the cam gear dry and wiggle it I get ~4 thousandths "wiggle" when measured with a dial indicator stuck to the flywheel. Does that sound correct? Would that be considered two thousandths bearing clearance (2 on each side = 4)? Stu |
stugray |
Jul 29 2012, 11:03 AM
Post
#2
|
Advanced Member Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
The crank is bolted to the flywheel sitting on the bench vertical.
I put the magnetic base dial indicator on the flywheel and measure the total movement of the main bearing (opposite end of the crank) with the bearing dry. I dont have an inside micrometer to measure the bearing so this was just a sanity check. It seems a little more loose than normal, but it is very hard to judge. Of course once you put lube on the bearing and put it on it doesnt seem to have a lot of slop. Stu |
Lo-Fi Version | Time is now: 21st January 2025 - 08:57 PM |
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 ... |