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Ford 9N, 2N & 8N Discussion Forum
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Engine Rebuild - New Knock - Low Compression

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RICH

12-31-2004 23:56:47




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Hi:
I"ve totally rebuilt this engine. New Valves, guides, etc., New pistons, rings etc., Ground crank, new bearings, etc. All new wiring harness, etc.Had oil pump redone. New clutch and ring gear. Reassembled engine - seemed to run good but had knock low in engine. Took off pan found # 2 connecting rod hitting oil pickup tube. Removed head and took out #1 & #2 piston.Cut off excess threads on rod studs and adjusted oil tube to miss rods but still line up with drain hole. Reassembled. Started good ran good for awhile. Then developed another knocky sound higher in engine. Oil pressure 30 - 35 psi. But dry compression equal on all 4 cylinders about 50 psi.Has run about 45 minutes. Even if rings haven"t seated shouldn"t compression still approach 90.Seems to start good. It appears one valve guide may have something broken off and sitting in spring but can"t quite tell. Is this thing possessed by the devil????

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Russ in SoCal

01-01-2005 21:47:24




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 Re: Engine Rebuild - New Knock - Low Compression in reply to RICH, 12-31-2004 23:56:47  
Rich,
Probably gremlins. I "repaired" a knock in my 8N by loosening the fan belt a little. The smaller crowbar seems to work fine.
Russ



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Drmeatman

01-01-2005 05:28:57




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 Re: Engine Rebuild - New Knock - Low Compression in reply to RICH, 12-31-2004 23:56:47  
Rich,I'm having the same problem (oil pressure only) on a new rebuild.I've only about 3hr.low running time on engine.Oil pressure cold 50lb. then drops to 18lb.hot.Not sure but does the oil pressure come up as it's "breaking" in.Wish I had some wisdom words for you.



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Dean

01-01-2005 05:57:50




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 Re: Engine Rebuild - New Knock - Low Compression in reply to Drmeatman, 01-01-2005 05:28:57  
Unfortunately, oil pressure will not increase as rebuilt engine wears in. The situationn that you describe is usually caused by excessive oil pump clearances. This is common on these engines even after installing new oil pump gears because the wear is in the housing. Unfortunateley, replacing the housing requires align boring of the mains because the oil pump housing is part of the front main cap. That said, this condition is only a problem to perfectionists as low hot oil pressure at idle will not hurt the engine so long as the pressure at working speed is adequate. Two final points: 18 PSI hot at idle is not exeessively low, and excessive camshaft to block clearances can cause similar symptoms.

Dean

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Harry/NY.

01-01-2005 05:54:09




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 Re: Engine Rebuild - New Knock - Low Compression in reply to Drmeatman, 01-01-2005 05:28:57  
Drmeatman you said Not sure but does the oil pressure come up as it's "breaking" in. NO oil pressure never comes up from break in or normal wear. Try this take the releaf valve out the one behind the distrubitor clean it good. and yes it has a flat spot on it. VERY gently almost streach the spring JUST A LITTLE BIT less than a 1/32 of an inch. run about a cup of motor oil down the hole. put her togather and post back. worked for me. good luck Harry

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raytasch

01-01-2005 05:16:02




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 Re: Engine Rebuild - New Knock - Low Compression in reply to RICH, 12-31-2004 23:56:47  
Are you sure your cam timing is right? Is your compression gauge accurate?
ray



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Dave H (NY)

01-01-2005 04:14:42




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 Re: Engine Rebuild - New Knock - Low Compression in reply to RICH, 12-31-2004 23:56:47  
There's a problem if you are only gettinf 50lbs of compression, I would try a test with a differant gauge just to be sure the gauge is good. When the rings were installed into the block did you make sure the end gaps were staggered? If they are in line that will cause a compression loss and oil consumption. Also are the sleeves new? If not did you hone them before installing the piston assemblies?

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