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Ford 9n engine knock after rod bearing sleeves rep

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CD Stewart

01-10-2005 16:12:21




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Engine seized due to loss of oil pressure. Oil pick up tube fell out of oil pump. Rod and main bearing sleeves BADLY scored and holes clogged with bearing material. Replaced all bearing sleeves with same size as removed. Engine now starts right up, runs smoothly, idles, accelerates, and has good oil pressure but make a heck of a banging noise like metal hitting metal. When I had the pan down rods and piston pins seemed to be ok. After fix could turn over by hand crank easily with no indiactions of interference. Could my rod bearing sleeves be to thick? ( same as those removed) Could piston be slamming into head due to broken pin or rod and still run smoothly?

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rustyj14@yahoo.com

02-18-2005 17:34:17




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 Re: Ford 9n engine knock after rod bearing sleeves in reply to CD Stewart, 01-10-2005 16:12:21  
Did you check for a broken piston? I"ve heard them knocking in Ford engines i have worked on. Or even a broken crankshaft? The crank would still turn, even broken, for a short while. But, it would make noise. The engine would run, but not long. If i were doing it over, I"d do a complete teardown, and have everything checked thoroughly by a competent mechanic, who is "learned" on Ford engines. Not the latest models, those older engines. Another thing--when you got it all put back together, were you "short" some nuts or bolts? I"ve seen nuts in exhaust manifolds or intakes, that fell in there unnoticed, and when the engine is started up, they soon make their presence known in the engine, by "knocking"! Some otherwise expert mechanics were "felled" by that phenomenon! (Those errant nuts or clips or bolts seem to lay in wait until you quit for the day, then they jump into an area that is closed up, like the intake manifold, and as soon as you start the engine, they slide down on top of the piston, where they soon get pounded into the piston top, to make loud expensive rapping noises!) by; Rustyj

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Bob

01-11-2005 00:09:32




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 Re: Ford 9n engine knock after rod bearing sleeves in reply to CD Stewart, 01-10-2005 16:12:21  
Amongst many other things, it could be a connecting rod smacking the new oil pickup tube or a loose sleeve moving around.

(Note... the bearing "sleeves" are called "bearing inserts".)

Most often, when an engine seizes due to lack of lube, the cranshaft needsto be reground. Did you have yours checked for damage, roughness and excessive wear?



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J.Schwiebert

01-11-2005 17:59:48




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 Re: Ford 9n engine knock after rod bearing sleeves in reply to Bob, 01-11-2005 00:09:32  
When you did the front main, did you disassemble the oil pump. It is wise to check that and rebuilt it. Can you short out the spark plugs one at a time and make the noise go away? Did you plastigauge the bearings? How did you clean up the crank? What about all that metal floating around in the drilled oil passages, how were they cleaned?



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CD Stewart

01-12-2005 16:21:58




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 Re: Ford 9n engine knock after rod bearing sleeves in reply to J.Schwiebert, 01-11-2005 17:59:48  
J - thanks for response. Disassemble oil pump - no. Plastigage - yes. Metal in drilled passages -
none observed other than as slight buildup at edge of hole on one piston bearing, came off easily. I am concerned about residual metal in oil passage. Do you have a recommended way to clean without removing crank? Cleaned bearings with fine emery cloth, They seemed to clean up nicely. Be all that as it may what is it that happens to cause such a racket.

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CD Stewart

01-11-2005 13:50:03




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 Re: Ford 9n engine knock after rod bearing sleeves in reply to Bob, 01-11-2005 00:09:32  
Bob - Thanks for responding. Damage - Observed none. Roughness - residual "insert" material on bearings (two cyliners and front main) cleaned up nicely. Excessive wear - don"t know, "Insert clearance to bearings seemed to be ok. Insert turning - don't know. Before reassembly I checked for rod to pick up tube by hand cranking and wasn"t concerned that there would be interference. The sound is like hitting the block with a hammer. The more I think about the sequence of events, this same type of noise came up about 10 minutes before the seizure and progressively got worse. I"m thinking that whats happening is my ORIGINAL problem and that the resultant vibrations caused the oil pickup to break away and then the seisure due to lack of lub. I"ll be breaking down again in the near future to further investigate. Could I have a valve, spring, guide, or tappet problem? Broken, stuck, or binding.

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