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Corvair Center Forum :
Corvair Center Phorum
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Corvair Center
OT- for bearing Gurus
Posted by:
richard1
()
Date: July 31, 2015 08:59AM
I've never really sat down to look closely at bearings, but today I received the ones we pulled out of my 2002 Toyota HiLux 2.7 EFI that has 280,000 miles on it.
The mechanic disassembled the engine before finally finding the small crack in the head leading a valve seat. So I bought a new head and while we are at it changing the bearings and rings, etc.
But my question is, in looking at the bearings, they are ridged. And the ridges are still there 280,000 miles later.
Why the ridges? Do they help oil flow?
Restoration in Bolivia
Richard's Mini Pickup
Richard's Corvair
Richard's Renault Dauphine
Selection of the Right Motor Oil for the Corvair
Selection of the right transmission oil for the corvair
How to polish and restore stainless and aluminum trim
The mechanic disassembled the engine before finally finding the small crack in the head leading a valve seat. So I bought a new head and while we are at it changing the bearings and rings, etc.
But my question is, in looking at the bearings, they are ridged. And the ridges are still there 280,000 miles later.
Why the ridges? Do they help oil flow?
Restoration in Bolivia
Richard's Mini Pickup
Richard's Corvair
Richard's Renault Dauphine
Selection of the Right Motor Oil for the Corvair
Selection of the right transmission oil for the corvair
How to polish and restore stainless and aluminum trim
Attachments:
Re: OT- for bearing Gurus
Posted by:
junkman
()
Date: July 31, 2015 09:03AM
I wouldn't mess with the bearings if they don't appear to be worn. Plastigage it, and if it is in spec, then leave it along. If the rings are not worn, and the engine is tight, just replace the head and put it back together. If it isn't broken, don't try to make it better. All too often, I have seen engines "rebuilt" that didn't need it, and they didn't run as well as before they were messed with.
Re: OT- for bearing Gurus
Posted by:
richard1
()
Date: July 31, 2015 11:26AM
If I had been there I would have run a compression check and never pulled more than the head. But since they disassembled it all, not even marking what bearings were where, I'll replace them.
Restoration in Bolivia
Richard's Mini Pickup
Richard's Corvair
Richard's Renault Dauphine
Selection of the Right Motor Oil for the Corvair
Selection of the right transmission oil for the corvair
How to polish and restore stainless and aluminum trim
Restoration in Bolivia
Richard's Mini Pickup
Richard's Corvair
Richard's Renault Dauphine
Selection of the Right Motor Oil for the Corvair
Selection of the right transmission oil for the corvair
How to polish and restore stainless and aluminum trim
Re: OT- for bearing Gurus
Posted by:
MattNall
()
Date: July 31, 2015 11:41AM
I've noticed that on the few I've torn apart.... all trucks...70-80's...
And they all looked good as well...
Ridges? to increase oil film cushioning??
MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo
And they all looked good as well...
Ridges? to increase oil film cushioning??
MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo
Re: OT- for bearing Gurus
Posted by:
jjohnsonjo
()
Date: July 31, 2015 11:56AM
Are they spiral or concentric? Hard to tell from the pics.
J.O.
65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo
Bethlehem,Pa
J.O.
65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo
Bethlehem,Pa
Re: OT- for bearing Gurus
Posted by:
MattNall
()
Date: July 31, 2015 12:05PM
And are the mains the same? I've never got that far...
MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo
MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo
Re: OT- for bearing Gurus
Posted by:
richard1
()
Date: July 31, 2015 12:47PM
We did not take it any further.
Restoration in Bolivia
Richard's Mini Pickup
Richard's Corvair
Richard's Renault Dauphine
Selection of the Right Motor Oil for the Corvair
Selection of the right transmission oil for the corvair
How to polish and restore stainless and aluminum trim
Restoration in Bolivia
Richard's Mini Pickup
Richard's Corvair
Richard's Renault Dauphine
Selection of the Right Motor Oil for the Corvair
Selection of the right transmission oil for the corvair
How to polish and restore stainless and aluminum trim
Re: OT- for bearing Gurus
Posted by:
jcorvair
()
Date: July 31, 2015 12:54PM
The grooves are spiral, suggesting they are cut by lathe or some sort of thread cutter. I personally have not seen bearings like that before, but seems like a similar idea to the grooves on transmission syncros.
James
Maple Ridge, BC
2013 Hyundai Santa Fe Turbo
2013 Hyundai Elantra (daughter's future car)
2009 Silverado HD Crew Cab 4x4 (for haulin cars, trailers, fifth wheels, quads, etc.)
2013 Victory Car Hauler (enclosed)
2015 Polaris 570 EPS
2016 Polaris 570 SP
James
Maple Ridge, BC
2013 Hyundai Santa Fe Turbo
2013 Hyundai Elantra (daughter's future car)
2009 Silverado HD Crew Cab 4x4 (for haulin cars, trailers, fifth wheels, quads, etc.)
2013 Victory Car Hauler (enclosed)
2015 Polaris 570 EPS
2016 Polaris 570 SP
Re: OT- for bearing Gurus
Posted by:
jmaechtlen
()
Date: August 01, 2015 12:22AM
Interesting - I wonder if it helps the oil stay in the bearing area, to improve - what?
Might it improve oil holding for startup? Increase the effective width of the bearing by impeding flow to the side?
I guess it is possible those are just tool marks from a suitable manufacturing process.
Might it improve oil holding for startup? Increase the effective width of the bearing by impeding flow to the side?
I guess it is possible those are just tool marks from a suitable manufacturing process.
Re: OT- for bearing Gurus
Posted by:
vairmech
()
Date: August 01, 2015 04:12AM
I can see a couple of reasons for the grooves, oil retention even while running and less friction if the bearing would contact the crank.
By the looks of the bearing you showed and if all the rest look like that, I would just put the bearings back in the engine. Position? It doesn't look like it matters. I take it the crank is smooth?
Ken Hand
Handy Car Care
248 613 8586
Vairmech@aol.com
By the looks of the bearing you showed and if all the rest look like that, I would just put the bearings back in the engine. Position? It doesn't look like it matters. I take it the crank is smooth?
Ken Hand
Handy Car Care
248 613 8586
Vairmech@aol.com
Re: OT- for bearing Gurus
Posted by:
richard1
()
Date: August 01, 2015 04:14AM
My guess is they help channel the oil within the bearing before it is forced out, but it is only a guess.
Ken, that's also a good thought about taking the pressure off the whole bearing.
Interesting to note that after so many miles they are still there and still looking good.
Restoration in Bolivia
Richard's Mini Pickup
Richard's Corvair
Richard's Renault Dauphine
Selection of the Right Motor Oil for the Corvair
Selection of the right transmission oil for the corvair
How to polish and restore stainless and aluminum trim
Edited 1 time(s). Last edit at 08/01/2015 04:15AM by richard1.
Ken, that's also a good thought about taking the pressure off the whole bearing.
Interesting to note that after so many miles they are still there and still looking good.
Restoration in Bolivia
Richard's Mini Pickup
Richard's Corvair
Richard's Renault Dauphine
Selection of the Right Motor Oil for the Corvair
Selection of the right transmission oil for the corvair
How to polish and restore stainless and aluminum trim
Edited 1 time(s). Last edit at 08/01/2015 04:15AM by richard1.
Re: OT- for bearing Gurus
Posted by:
jjohnsonjo
()
Date: August 01, 2015 04:30AM
[en.wikipedia.org] ??????
J.O.
65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo
Bethlehem,Pa
J.O.
65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo
Bethlehem,Pa
Re: OT- for bearing Gurus
Posted by:
richard1
()
Date: August 01, 2015 08:40AM
Thanks. Good read
But I don't think it applies here, as these grooves are parallel. But now I understand the purpose of the grooves on the thrust bearings and on the grease seal washers on the Mini suspension.
Restoration in Bolivia
Richard's Mini Pickup
Richard's Corvair
Richard's Renault Dauphine
Selection of the Right Motor Oil for the Corvair
Selection of the right transmission oil for the corvair
How to polish and restore stainless and aluminum trim
But I don't think it applies here, as these grooves are parallel. But now I understand the purpose of the grooves on the thrust bearings and on the grease seal washers on the Mini suspension.
Restoration in Bolivia
Richard's Mini Pickup
Richard's Corvair
Richard's Renault Dauphine
Selection of the Right Motor Oil for the Corvair
Selection of the right transmission oil for the corvair
How to polish and restore stainless and aluminum trim
Re: OT- for bearing Gurus
Posted by:
jmaechtlen
()
Date: August 01, 2015 11:05PM
Posted a query on an engineering forum. Got some discussion, nothing definitive.
If you have any of those old ones left around, it would be interesting to know what the depth of those grooves.
It's hardly critical, since the inserts were replaced.
But certainly a point of curiosity.
If you have any of those old ones left around, it would be interesting to know what the depth of those grooves.
It's hardly critical, since the inserts were replaced.
But certainly a point of curiosity.
Re: OT- for bearing Gurus
Posted by:
cnicol
()
Date: August 02, 2015 07:59AM
I'm curious to know the answer too. I did a little googling and ended up at a Vandervell (bearing maker) site.Click here
Curiously, and opposite to what we see in your engine's bearings, their point was to minimize the length of the "regular" oil distribution groove to provide more flat bearing area for a larger oil film area and increased bearing capacity.
It's like old thinking vs some kind of new thinking. The question is, which is the newer thinking? I'm certain Toyota had good reason for grooving the bearings and it's hard to argue with your engine's good result, but then your engine no doubt has the best possible oil scenario since it's in the hands of the master.
Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691
+17 Tons of parts
Curiously, and opposite to what we see in your engine's bearings, their point was to minimize the length of the "regular" oil distribution groove to provide more flat bearing area for a larger oil film area and increased bearing capacity.
It's like old thinking vs some kind of new thinking. The question is, which is the newer thinking? I'm certain Toyota had good reason for grooving the bearings and it's hard to argue with your engine's good result, but then your engine no doubt has the best possible oil scenario since it's in the hands of the master.
Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691
+17 Tons of parts
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