#2 rod bearing spun!

#2 rod bearing spun!

Joined: September 18th, 2007, 1:58 am

June 13th, 2011, 2:41 am #1

hey guys dont post on here much but need a lil advice. Took truck out last other weekend running like a top (lil to good maybe lol) after a good romp session had a rod knocking. tore down found #2 rod spun now ths is a very budget operation . Plan is new bearings bottom end guna roll em in dont plan on tearing down any more than the oil pan. Heads front cover staying on! my ? is about oiling i heard ther is an auxillarty oil line that is recomended and i need info on that hopefully pictures??!! motor is stock with performer 400 intake with propane.

74 and 75 F250 360/390
HIGHBOY
77 F350 2wd 400 my daily dually!
82 F350 4x4 400 trail truck
03 F250 4x4 7.3Dl
74 and 75 F250 360/390
HIGHBOY
77 F350 2wd 400 my daily dually!
82 F350 4x4 400 trail truck
03 F250 4x4 7.3Dl
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Joined: July 24th, 2008, 10:06 pm

June 13th, 2011, 3:21 am #2

If you spun the number two rod bearing check the fuel pump. If the fuel pump starts to leak it will spray fuel directly on the number two bearing. The external line you are talking about goes from the front oil plug beside the filter to the back of the engine just behind the intake manifold. I use a 3/8" steal line with flared fittings into brass 90* elbows.
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Joined: December 16th, 2003, 1:59 am

June 13th, 2011, 3:56 pm #3

fuel can spray on the #2 rod bearing?

http://www.youtube.com/watch?v=WEzBeP6pRoY

the fuel pump is in the timing case(rather high up) and the #2 rod is on the 2nd crank throw, that's 2 bulkheads away

there'll be phantoms, there'll be fires on the road... and the white man dancing
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Joined: June 12th, 2009, 1:31 pm

June 13th, 2011, 7:00 pm #4

hey guys dont post on here much but need a lil advice. Took truck out last other weekend running like a top (lil to good maybe lol) after a good romp session had a rod knocking. tore down found #2 rod spun now ths is a very budget operation . Plan is new bearings bottom end guna roll em in dont plan on tearing down any more than the oil pan. Heads front cover staying on! my ? is about oiling i heard ther is an auxillarty oil line that is recomended and i need info on that hopefully pictures??!! motor is stock with performer 400 intake with propane.

74 and 75 F250 360/390
HIGHBOY
77 F350 2wd 400 my daily dually!
82 F350 4x4 400 trail truck
03 F250 4x4 7.3Dl
I hate to think about what mite have happened to that rod after the bearing spun in it. Better check it out really good or it could trash the entire engine.
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Joined: May 20th, 2005, 4:48 pm

June 13th, 2011, 7:10 pm #5

hey guys dont post on here much but need a lil advice. Took truck out last other weekend running like a top (lil to good maybe lol) after a good romp session had a rod knocking. tore down found #2 rod spun now ths is a very budget operation . Plan is new bearings bottom end guna roll em in dont plan on tearing down any more than the oil pan. Heads front cover staying on! my ? is about oiling i heard ther is an auxillarty oil line that is recomended and i need info on that hopefully pictures??!! motor is stock with performer 400 intake with propane.

74 and 75 F250 360/390
HIGHBOY
77 F350 2wd 400 my daily dually!
82 F350 4x4 400 trail truck
03 F250 4x4 7.3Dl
....I think you're in for more than just rolling in new bearings. When they spin, they push babbitt, copper, and metal through the whole oiling system.

Brent Lykins
B2 Motorsports, LLC






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Joined: December 22nd, 2009, 6:12 pm

June 13th, 2011, 8:15 pm #6

hey guys dont post on here much but need a lil advice. Took truck out last other weekend running like a top (lil to good maybe lol) after a good romp session had a rod knocking. tore down found #2 rod spun now ths is a very budget operation . Plan is new bearings bottom end guna roll em in dont plan on tearing down any more than the oil pan. Heads front cover staying on! my ? is about oiling i heard ther is an auxillarty oil line that is recomended and i need info on that hopefully pictures??!! motor is stock with performer 400 intake with propane.

74 and 75 F250 360/390
HIGHBOY
77 F350 2wd 400 my daily dually!
82 F350 4x4 400 trail truck
03 F250 4x4 7.3Dl
just replacing the bearings (both rod and main bearings) and the oil pump and screen. Check the crank carefully. Depending on how much it was ran with the rod knocking you could have a flat spot on it. Also as was recommended check the rod for damage and beware of debris in the oil system now. A spun bearing does more damage than just a "hammered" bearing.

The only 2 times I was able to get by with new bearings alone it was because as soon as I heard the knock I pulled the spark plug wire for that cylinder and hardly ran it at all while knocking. Glad I was running points back then as I wouldn't try it with HEI. However that being said, I still had to do a rebuild within 5000 miles. To bad about the rod but at least it didn't come out the side. Good luck and don't forget a rebuild kit is not really all that expensive if you just do a "overhaul." It is the boring, oversize pistons, a valve job, etc. that runs the cost up.
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Joined: December 16th, 2003, 1:59 am

June 14th, 2011, 6:22 pm #7

hey guys dont post on here much but need a lil advice. Took truck out last other weekend running like a top (lil to good maybe lol) after a good romp session had a rod knocking. tore down found #2 rod spun now ths is a very budget operation . Plan is new bearings bottom end guna roll em in dont plan on tearing down any more than the oil pan. Heads front cover staying on! my ? is about oiling i heard ther is an auxillarty oil line that is recomended and i need info on that hopefully pictures??!! motor is stock with performer 400 intake with propane.

74 and 75 F250 360/390
HIGHBOY
77 F350 2wd 400 my daily dually!
82 F350 4x4 400 trail truck
03 F250 4x4 7.3Dl
to me a spun bearing has lost it's tabs and static position in the rod bore and is now loose in the rod, rolling around between the rod and the crank. the rod is whacked and needs resizing if it's not junk

a 'spun rod bearing' usually converts to an overlapped rod bearing VERY quickly, where the crank is now whacked and needs turning and/or welding

an overlapped bearing many times welds itself between the crank & rod breaks and punches a window in the block

a 'wiped' bearing is one that suffered an oil shortage and is caught before it spins, overlaps & welds

there'll be phantoms, there'll be fires on the road... and the white man dancing
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Joined: September 18th, 2007, 1:58 am

June 18th, 2011, 3:54 pm #8

thanks for the advice guys but im not tearning ths motor the rest the way down. reason being if I do I won't b able to stop and everything would have to b perfert before reassembly. I dont have the time or money for that! The "spun" bearing in question i would call a best case for a spun bearing not welded together not wraped and did not run very long crank "looks" ok rod cap comes of by hand no need to pry it off. So hopefully not spread to much. It may only last the day but thts a risk im willing to take. as far as the fuel pump Im running propane so fuel pump is nonexistent. Doest anyone have pic's of the auxillary oil line and wht are the bennifits suposed to be?

74 and 75 F250 360/390
HIGHBOY
77 F350 2wd 400 my daily dually!
82 F350 4x4 400 trail truck
03 F250 4x4 7.3Dl
74 and 75 F250 360/390
HIGHBOY
77 F350 2wd 400 my daily dually!
82 F350 4x4 400 trail truck
03 F250 4x4 7.3Dl
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Joined: December 16th, 2003, 1:59 am

June 18th, 2011, 4:11 pm #9

http://www.asajay.com/351rebuild/oil2.htm

the external oil line is an 'end run' for the oil to get to the rear of the lifter galley that feeds the mains, without having to go through the length of the block. this way the lifter galley is fed from both ends instead of only from the front. the 'last' main in the oil system is noe the #3 in the middle, and it's fed from both directions, so the likelyhood of a main bearing(and rods) towards the rear of the block not getting fed oil is reduced

there is much debate about the usefullness of the external line. search the forum and you'll find plenty, some even say it can reduce oil flow?

http://cgi.ebay.com/ebaymotors/351-C-Cl ... ccessories



there'll be phantoms, there'll be fires on the road... and the white man dancing
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Joined: July 12th, 2008, 1:55 pm

June 19th, 2011, 1:31 am #10

thanks for the advice guys but im not tearning ths motor the rest the way down. reason being if I do I won't b able to stop and everything would have to b perfert before reassembly. I dont have the time or money for that! The "spun" bearing in question i would call a best case for a spun bearing not welded together not wraped and did not run very long crank "looks" ok rod cap comes of by hand no need to pry it off. So hopefully not spread to much. It may only last the day but thts a risk im willing to take. as far as the fuel pump Im running propane so fuel pump is nonexistent. Doest anyone have pic's of the auxillary oil line and wht are the bennifits suposed to be?

74 and 75 F250 360/390
HIGHBOY
77 F350 2wd 400 my daily dually!
82 F350 4x4 400 trail truck
03 F250 4x4 7.3Dl
It's your engine and your choice but.. You do realise that if it only lasts a day and you window the block, then your up for twice as much money as fixing it properly right now? Doesn't make sense God gave a Mule Goodluck with it, hope it doesn't bite..
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