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04-17-2019, 06:27 PM
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Join Date: Oct 2014
Location: Sarasota Fl
Posts: 168
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Slightly used bearings with new cranshaft?
My O360 with 3HSMO has turned out to be a total nightmare with corrosion throughout. My crankshaft failed due to pitting and having no luck on finding a decent used one, I found a new ECI. What do you engine guys think about reusing the bearings, they only have 3 hours on them, you can see that they just started showing wear marks. I hate to do it but this thing has me tapped out.
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04-17-2019, 07:30 PM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,562
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I feel your pain. What did the crank mic to? Can't be polished or ground over?
__________________
Please don't PM me! Email only!
Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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04-17-2019, 07:36 PM
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Join Date: Nov 2016
Location: Camas, WA
Posts: 370
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Sorry about your engine- that is rough.
How much are new bearings? I know you are tapped out, but if it were me, I think the extra cost/insurance of new vs. a potential tear down again to replace would push me over the edge.
I am sure there are some engine experts on here that'll chime in with better advice but I'd sleep better not worrying.
Good luck no matter which way you go.
__________________
Dan Reed
Camas, WA
RV-7A - Slider in progress - N167DR (reserved)
Sitting in the paint booth, then final assembly/inspection time
2018 and 2019 VAF dues paid
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04-17-2019, 07:41 PM
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Join Date: Oct 2014
Location: Sarasota Fl
Posts: 168
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The crank had pitting in the middle main bearing journal fillet.
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04-17-2019, 08:07 PM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,762
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This is NOT a place to "cheap-out"!
New main bearings are cheap compared to possible alternative problems.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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04-18-2019, 06:49 AM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,514
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Just say NO, sorry.
I don't know what the cost of bearings are but would not reuse bearings operated with a scored/pitted/dirty crank.
Some bearings are solid aluminum, but they are intolerant of debris as it will not embed, simply score. PbSn overlays are there to allow embedding of tiny debris, if that is iron oxide, it will forever yield abrasive wear to the crank journals.
If the bearings were from an ultra clean engine for a few hours, then - - maybe - -but otherwise NO.
Cheap always costs more in the longer run. Add up all of these cheap decisions and the anchor just gets heavier.
PS: In 250 engine rebuilds, I never reused a bearing.
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
Last edited by BillL : 04-19-2019 at 07:16 AM.
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04-18-2019, 04:42 PM
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Join Date: Jan 2007
Location: fort myers fl
Posts: 945
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General rule for any engine, never reuse main bearings.benn that way for all motor sports I've been involved with. Cars,boats,planes,motorcycles,snowmobiles they all get new bearings once they come apart
Bob rv4
N82rb
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04-18-2019, 05:21 PM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,762
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YEP.........
Quote:
Originally Posted by n82rb
General rule for any engine, never reuse main bearings. Been that way for all motor sports I've been involved with. Cars, boats, planes, motorcycles, snowmobiles. They all get new bearings once they come apart.
Bob rv4
N82rb
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I've been an auto mechanic since 1960 and A&P since 1972 and that's always been the rule.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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04-18-2019, 07:23 PM
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Join Date: Oct 2014
Location: Sarasota Fl
Posts: 168
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Ok, I am adding new bearings to the list, thanks guys.
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04-19-2019, 05:56 AM
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Join Date: Aug 2006
Location: Lexington, KY
Posts: 88
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You might be able to sell your barely used bearings to someone in the airboat crowd. Just a thought.
__________________
Cameron
Christen Eagle II Builder
N216HP
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