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rod bearing failure what the....? #1610008 04/20/14 08:38 PM 04/20/14 08:38 PM
Joined: Dec 2006 Posts: 4,647 aotearoa rebel OP master
rebel OP master Joined: Dec 2006 Posts: 4,647 aotearoa	while stripping down my block so i can do some pressure tests, i found 2 rod bearings having a rather unusual failure. well one i'd never seen anyway. at first i thought they had fused onto the crank journal because they fought me hard when i tried to get them off. once off it became apparent they were no longer the same shape as the others. they where a tighter radius as well as being toast. they're the same part # as the others but they physically look like they were for a smaller journal. what would cause this? 8119167-2014-04-2016.54.53.jpg (393 downloads)

Re: rod bearing failure what the....? [Re: rebel] #1610009 04/20/14 08:39 PM 04/20/14 08:39 PM
Joined: Dec 2006 Posts: 4,647 aotearoa rebel OP master
rebel OP master Joined: Dec 2006 Posts: 4,647 aotearoa	compared to another bearing they're a tighter radius for sure. 8119169-2014-04-2016.55.25.jpg (306 downloads)

Re: rod bearing failure what the....? [Re: rebel] #1610010 04/20/14 08:51 PM 04/20/14 08:51 PM
Joined: Apr 2005 Posts: 1,505 TN S SCATPACK 1 pro stock
SCATPACK 1 pro stock S Joined: Apr 2005 Posts: 1,505 TN	That really looks like a piece of metal shaving or a piece of sand grit got into your oil supply. Something too big to pass thru and the grit ate the bearing up and pulled on it enough to re shape the bearing. Seen it before. Clean everything thoroughly and put new bearings n it. Old Geezer Racing

Re: rod bearing failure what the....? [Re: rebel] #1610011 04/20/14 08:57 PM 04/20/14 08:57 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	Quote: compared to another bearing they're a tighter radius for sure. Look at the discoloration on the back of the bearing. It got hot enough to loose it's tension / shape. Fastest 300

Re: rod bearing failure what the....? [Re: rebel] #1610012 04/20/14 08:58 PM 04/20/14 08:58 PM
Joined: Jun 2007 Posts: 2,646 Plymouth Meeting, PA bigtimeauto Trophy Winner
bigtimeauto Trophy Winner Joined: Jun 2007 Posts: 2,646 Plymouth Meeting, PA	Quote: . once off it became apparent they were no longer the same shape as the others. they where a tighter radius as well as being toast. they're the same part # as the others but they physically look like they were for a smaller journal. what would cause this? heat from the lack of oil/clearance BB, TT5,Procharged 3300lb Street Car 4.79/154

Re: rod bearing failure what the....? [Re: bigtimeauto] #1610013 04/21/14 12:55 AM 04/21/14 12:55 AM
Joined: Nov 2004 Posts: 6,890 North Alabama M Monte_Smith master
Monte_Smith master M Joined: Nov 2004 Posts: 6,890 North Alabama	Quote: Quote: . once off it became apparent they were no longer the same shape as the others. they where a tighter radius as well as being toast. they're the same part # as the others but they physically look like they were for a smaller journal. what would cause this? heat from the lack of oil/clearance EXACTLY........did you check the bearing clearances on EVERY rod and EVERY throw, or just put them in. You were VERY few runs from a spun bearing and a wiped crank journal. Be sure and have those rods checked for roundness, size and proper crush, as well as checking the crank for size and taper Monte

Re: rod bearing failure what the....? [Re: Monte_Smith] #1610014 04/21/14 02:03 AM 04/21/14 02:03 AM
Joined: Dec 2006 Posts: 4,647 aotearoa rebel OP master
rebel OP master Joined: Dec 2006 Posts: 4,647 aotearoa	i bought this engine complete as a fresh build from a member on here, it was built by Robinson Engines in Middletown Ohio. i assumed it was professionally built so only checked the named parts were installed & fitted the engine into my car. this time round i'm checking everything myself.

Re: rod bearing failure what the....? [Re: rebel] #1610015 04/21/14 02:58 PM 04/21/14 02:58 PM
Joined: Aug 2003 Posts: 43,157 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,157 Bend,OR USA	Quote: this time round i'm checking everything myself. No ones cares more about you than you and your love ones, do all you can yourself I had a older comercial pilot tell me yeas ago he made sure on every flight he was involved in that he didn't let anyone else kill him do to there incompetence or lack of skill I try to use the rule now also Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: rod bearing failure what the....? [Re: Cab_Burge] #1610016 04/21/14 04:23 PM 04/21/14 04:23 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	Quote: Quote: this time round i'm checking everything myself. No ones cares more about you than you and your love ones, do all you can yourself I had a older comercial pilot tell me yeas ago he made sure on every flight he was involved in that he didn't let anyone else kill him do to there incompetence or lack of skill I try to use the rule now also Excellent info. My brother was big in to aerobatic flying ( owned a Citabria ) a few years back. Had his first annual done on the plane. Taxied to the end of the runway and lined up for take-off. Went to test both mags. Shut one off and the motor died. The guy that did the inspection forgot to hook up the wire to 1 of the mags. It wasn't 6 months before my brother got his own A&P license and was qualified to do his own annuals - including twin motored stuff. Moral, do it yourself if you can. Fastest 300

Re: rod bearing failure what the....? [Re: Crizila] #1610017 04/22/14 12:52 AM 04/22/14 12:52 AM
Joined: Nov 2004 Posts: 6,890 North Alabama M Monte_Smith master
Monte_Smith master M Joined: Nov 2004 Posts: 6,890 North Alabama	ANY engine, that is of a performance intent.....if I didn't assemble it myself, or know the builder VERY well, I consider that engine used and I knock it down to have a look. And I have seen some well known BUILDERS who may mic the crank and rods, but pull ONE PAIR of bearings from a set to check clearance and then just assemble the rest. Anything could happen, from a thin or thick shell, to packaged wrong, or stamped wrong. CHECK THEM ALL. Sure, it takes time, but less time than redoing a motor because of a spun bearing Monte

Re: rod bearing failure what the....? [Re: Monte_Smith] #1610018 04/22/14 10:20 AM 04/22/14 10:20 AM
Joined: Sep 2003 Posts: 2,008 Sweet Home Alabama M MRMOPAR622 top fuel
MRMOPAR622 top fuel M Joined: Sep 2003 Posts: 2,008 Sweet Home Alabama	While you are at it check your cam bearings. "To Be The Man'You Have Got To Beat The Man" "T/D and Pro-Bracket Racer"

Re: rod bearing failure what the....? [Re: rebel] #1610019 04/22/14 11:59 AM 04/22/14 11:59 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Its heat causing that... I had low oil pressure in a Jeep I bought so I dropped the pan and seen 1 set of rod bearings that fell out ... I replaced them with a stock set of bearings and changed the oil pump... I believe the previous owner ran low on oil or over heated the engine

Re: rod bearing failure what the....? [Re: Monte_Smith] #1610020 04/22/14 08:41 PM 04/22/14 08:41 PM
Joined: Mar 2006 Posts: 9,835 MI, usa dvw master
dvw master Joined: Mar 2006 Posts: 9,835 MI, usa	Quote: ANY engine, that is of a performance intent.....if I didn't assemble it myself, or know the builder VERY well, I consider that engine used and I knock it down to have a look. And I have seen some well known BUILDERS who may mic the crank and rods, but pull ONE PAIR of bearings from a set to check clearance and then just assemble the rest. Anything could happen, from a thin or thick shell, to packaged wrong, or stamped wrong. CHECK THEM ALL. Sure, it takes time, but less time than redoing a motor because of a spun bearing Monte A saying I learned long ago. If you didn't have enough time to check the first time, you'll certainly have enough time the second time. Its always quicker to do it once. Doug

Re: rod bearing failure what the....? [Re: dvw] #1610021 04/22/14 10:50 PM 04/22/14 10:50 PM
Joined: Dec 2006 Posts: 4,647 aotearoa rebel OP master
rebel OP master Joined: Dec 2006 Posts: 4,647 aotearoa	it's a bit like buying a Crate motor. would you still pull it down & check everything? this engine came to me as a fresh build wrapped in cling wrap plastic. it was meerly a case of pull the pan, check the bearings were new & the parts were what it was advertised as. unfortunately for us now we've found there was dirt inside the galleries as all the bearings show contamination. but when all the holes are plugged i kinda expected the engine to have been built to some degree of expertise. live & learn i guess, trust nobody, no matter how highly they're regarded. looks like i'm the best engine builder i know & thats' scarey!

Re: rod bearing failure what the....? [Re: rebel] #1610022 04/23/14 01:05 AM 04/23/14 01:05 AM
Joined: Oct 2003 Posts: 11,684 W. Kentucky justinp61 I Live Here
justinp61 I Live Here Joined: Oct 2003 Posts: 11,684 W. Kentucky	Quote: looks like i'm the best engine builder i know & thats' scarey! I'm not the best engine builder I know.................but I'm the only engine builder I trust. Sorry about your troubles.

Re: rod bearing failure what the....? [Re: rebel] #1610023 04/23/14 10:35 AM 04/23/14 10:35 AM
Joined: Jan 2003 Posts: 75,004 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,004 U.S.S.A.	Quote: it's a bit like buying a Crate motor. would you still pull it down & check everything? Yes I did. I bought a Mopar Performance crate hemi and it's a good thing I tore it down , what a mess ...

Re: rod bearing failure what the....? [Re: JohnRR] #1610024 04/23/14 11:47 AM 04/23/14 11:47 AM
Joined: Jan 2012 Posts: 2,645 Stuttgart, Arkansas rickseeman master
rickseeman master Joined: Jan 2012 Posts: 2,645 Stuttgart, Arkansas	Good bearing info http://catalog.mahleclevite.com/bearing/ 2011 Drag Pak Challenger

Re: rod bearing failure what the....? [Re: rickseeman] #1610025 04/23/14 06:49 PM 04/23/14 06:49 PM
Joined: Dec 2006 Posts: 4,647 aotearoa rebel OP master
rebel OP master Joined: Dec 2006 Posts: 4,647 aotearoa	Quote: Good bearing info http://catalog.mahleclevite.com/bearing/ thanx for that link, good to know these things.

Re: rod bearing failure what the....? [Re: rebel] #1610026 04/24/14 12:22 AM 04/24/14 12:22 AM
Joined: Nov 2004 Posts: 6,890 North Alabama M Monte_Smith master
Monte_Smith master M Joined: Nov 2004 Posts: 6,890 North Alabama	"Crate Motors" are seldom assembled by the most experienced builder in most shops. There is a big difference in a "builder" and an "assembler". ANY reasonably competent person can "assemble" a motor. Monte

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