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Tool Talk Discussion Forum

shims on the crankshaft

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mark gowan

12-25-2007 07:40:34




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I have recently discovered that three of the rods on my F 20 are missing shims on one side. They seem very tight, but... do they need to be replaced immediately, or can I be lazy?




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Mike in Shendoah Valley

12-28-2007 08:24:47




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 Re: shims on the crankshaft in reply to mark gowan, 12-25-2007 07:40:34  
Mark--just make sure you do a compression check before you tear down,a lot of compression isn't neccesary,justso all cyls are within 15lbs of each other.If reading are ok,rebuilding will not fix the miss. Now,you say 3 and 4 are missing-hmmmm-could be a head gasket blown between the two cyls. this is likely if 3 and 4 have low or no compression. bye



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mark gowan

12-28-2007 09:32:02




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 Re: shims on the crankshaft in reply to Mike in Shendoah Valley, 12-28-2007 08:24:47  
Thanks a lot Mike



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Mike in Shendoah Valley

12-27-2007 08:23:13




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 Re: shims on the crankshaft in reply to mark gowan, 12-25-2007 07:40:34  
Mark--The shims you are talking about are for getting the proper clearance between the rod bearing surface and the crankshaft surface.In your post I think you may be concerned about endplay(the sliding motion of the rod forward and backwards on the shaft)If so,this is of little concern--all engine need this.However,if you are actually referring to the up and down movement of the rod on the crank (piston/rod up and down movement)then you got problems.Bob/ohio is absolutely right-plastic gauge the clearances. Shims are generally suspose to be evenly divided on each side of the rod,3 on one side will work but 1 on one side and 2 on the other would be correct.Now if you have too much crank/rod clearance,moving the same shims to their proper places WON'T help any,but will require removal of a shim or two.On these old IHC's they came with lots of shims on both sides of the rod.Also these shims were easily mistaken as only a shim or two because of the way they are pressed together. take a pocket knife or your good fingernail and pick at these,they ARE very thin.If in fact 3 is it,then you don't have much bearing babbit left.Good luck,I have an F-20 that the first owner updated with a lot of stuff including an "M" carb--runs smooth as a watch.

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mark gowan

12-27-2007 08:42:36




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 Re: shims on the crankshaft in reply to Mike in Shendoah Valley, 12-27-2007 08:23:13  
Thanks. I think that answered my question, but it also confirmed what I was worried about. There is some play, and I am planning to plastiguage it. It's odd, though, I didn't hear any knocking. This tractor runs superb...when it runs. Right now I'm playing with two problems, one being the crankshaft and the other being two cylinders not firing (they get spark). Thanks for the help!



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Mike in Shendoah Valley

12-27-2007 10:23:46




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 Re: shims on the crankshaft in reply to mark gowan, 12-27-2007 08:42:36  
Mark engine miss as you know can be caused by alot of things. Best is to check compression on all cyls first off.If she's sit for awhile between runs a valve could be sticking on two of them.I've seen these motors pull tricks at times-like valves working and having good compression at cranking speed and at idle(maybe)then at rpm's they are sluggish to return to their seat in time to run right(usually due to not enough lube on stems)I check this by running at idle with valve cover off and using a large screwdriver or bar under part of valve spring to give it more tension,engine will then fire. Also you might look closly at the 1/8 inch priming pipes that come thru the valve cover,sometimes these get loose or crack at the threads causing vacumn leaks-this will only cause idling miss fires and would run ok under load. Try switching sparkplugs from the 2 good cyls to the bad ones and see if the same 2 cyls miss,just my cheap s/plug check

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mark gowan

12-27-2007 10:37:47




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 Re: shims on the crankshaft in reply to Mike in Shendoah Valley, 12-27-2007 10:23:46  
Hi Mike;
I"ve done the plug check and the valve spring check. It"s firing on all four cylinders plug wise, but no fire in the 3rd and 4th cylinder. I"ll check the priming pipes. I"m thinking about tearing the whole motor down and just overhauling it. It"s been refurbished, but I don"t know when that was, or how good it was done.
mark



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BobOHIO

12-25-2007 16:38:06




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 Re: shims on the crankshaft in reply to mark gowan, 12-25-2007 07:40:34  
It might be a good idea to plasti-gauge them to check clearances. On the other hand its amazing how forgiving these old engines can be.



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mark gowan

12-25-2007 17:32:29




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 Re: shims on the crankshaft in reply to BobOHIO, 12-25-2007 16:38:06  
Hi Bob;
Thanks for the reply. The "shims" I'm talking about are the ones that go around the crank itself on each side of the piston rod. I checked play around the crank, and there's quite a bit as well.



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