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Tight engine-- very tight

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mmershon

05-19-2002 23:05:47




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46 ac model B had a knock, tore it down and it was a wrist pin bushing. Had to sleeve it and new bearings. even used the old bearing shims and it is so tight I had to hook a 12 volt battery up to it to get it to turn over and get it running. sounds ok but will it loosen up after it runs a while and after I break it in and work it? doesnt show much oil pressure either . around 10 pounds, but all the old timers tell me they never carried much pressure. didnt replace cam buchings or oil pump. All coments very welcome

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Salvage Man

05-22-2002 07:36:33




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 Re: tight engine-- very tight in reply to mmershon, 05-19-2002 23:05:47  
I went and helped a customer that was overhauling a D14 that turned over hard and he had one of the rods in backwards.



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Farmer Brown

05-20-2002 09:46:36




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 Re: tight engine-- very tight in reply to mmershon, 05-19-2002 23:05:47  
If these are like the old WD's and WC's, each bearing has to be shimmed individually based on clearances for that bearing. It will not wear in. It will ruin itself, probably seize up a bearing.

I'm not a mechanic, but I remember there being a short cut, trial and error method that uses a special plastic string that you put in the bearing. You assemble. then disassemble and measure the width of the now deformed plastic. If is is too wide you add shims, too narrow means too much clearance and you deduct shims. Either way you do the string thing again until it's width is in the right range. I don't know what it is called or where you can still get it. Hopefully some one else can tell you more.

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Greg(Mo)

05-20-2002 11:07:29




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 Re: Re: tight engine-- very tight in reply to Farmer Brown, 05-20-2002 09:46:36  
What farmer Brown is talking about is called "plasti-guage". you can get it at any auto
parts store.



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Don

05-21-2002 09:04:26




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 Re: Re: Re: tight engine-- very tight in reply to Greg(Mo), 05-20-2002 11:07:29  
I assemble every engine with a" plasi-gauge "kit...You torque the bearing down with the plasti-guage between the bearing and the crank ..remove the bearing cap ..now take the piece of plastic and match up it's width,on the printed card that comes with the kit..that is the clearance of that bearing.....do it over ,using shims until you get it right ...I think you may have messed up the bearings you just put in..Dont touch the new bearing surface with your "dry" fingers..get a tube of assembly lube.Oil is not good enought....Next-- cam bearings, is where you loose most of your oil pressure...if you decide to replace them (I would)use assembly lube on those also ...adjust valves on the loose side...put on a new oil pump,(fill pump with oil) add the oil ,start engine,make sure you have oil pressure and run at half throttle for about 10 min. if it starts getting hot back it off to a fast idle..... .re-ajust valves according to the manual and change the oil and filter..... good luck

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