Home > VansAirForceForums

- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

Old 11-08-2018, 01:32 PM
tim2542 tim2542 is offline
Join Date: Aug 2009
Location: Redding,Ca
Posts: 633

This is an east coast friend and me on the west coast so Iím just looking at pics also. But to answer a few questions the crank was yellow tagged but donít know if itís std or not.
Further info now the bearing tang slots in the case are worn and the bearing has moved longitudinally enough to almost completely cover the oil port, yet it doesnít look like oil starvation. The bearing canít move if the case is torqued up proper and the case is machined correctly. So everything will go in for yellow tag and reassemble with new bearings etc.
Thanks! Tim
Reply With Quote
Old 11-08-2018, 05:18 PM
TAB TAB is offline
Join Date: Jan 2013
Location: Florida
Posts: 9

Rebuilder did not completely remove the cosmoline from new bearings, resulting in high initial friction and heat? Rebuilder used old surplus bearings that had surface corrosion? Dirty/plugged journal feed to this bearing at overhaul? Failed to apply overhaul (thick) lubricate to this bearing at overhaul? Installed a 0.003" over bearing in a standard journal? Moisture and acid damage will generally be prevalent throughout, very noticeable in valve covers as rust and green slime....your block looks clean, free of moisture and acid. Good luck!
Reply With Quote
Old 11-08-2018, 05:56 PM
EXflyer EXflyer is offline
Join Date: Jan 2016
Location: Chiloquin OR
Posts: 94
Default Bearings

Don't know where you have seen cosmoline on bearings they come with nothing on them. Various things can be used to coat them before installing the crank or cam. Some use oil or bearing lube not wheel bearing type of grease. If the bearing had been hot it is not showing that along with the face it would be moving metal off of the bearing onto the crank. Its corrosion nothing more. And when installing bearings you never touch the surface with your bare skin as that will cause problems due to the acid and moisture on your fingers. After installing hundreds of bearings over my life of doing engine work have again never seen a bearing coated with anything had I it would have been in the garbage.

Last edited by EXflyer : 11-08-2018 at 06:00 PM.
Reply With Quote
Old 11-13-2018, 11:20 PM
longline longline is offline
Join Date: Sep 2014
Location: silverdale, WA
Posts: 208
Default OP

has not identified the make of bearing. To cut the story short: Fresno Airparts had bearings made, who knows where, and sold them as "new old stock" for Continentals. This is the failure mode that those bearings suffered from.

If it was caused by contaminated oil then all of the bearings would probably have suffered the same. OP said they did not suffer the same.

Another clue is the bearing tab not allowing the bearing to sit in the proper position in the case.

OP stated that this was a field overhaul. If cost was a factor, the Fresno bearings were half the cost of OEM.

I would bet a great deal that this is not a Continental bearing.
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -6. The time now is 10:05 PM.

The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.