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Discussion Forum

Engine problems

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10-24-2002 18:46:22

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I am restoring a gas WD. I have then engine apart and had a valve job done and everything polished and new bearings. Now when i connected the connecting rods to the crankshaft the pistons won't move at all but the pistons will slid in the sleeves easily when not attached to the crankshaft. Can anyone help me out please thanks

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10-25-2002 18:14:11

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 Re: Engine problems in reply to Fred, 10-24-2002 18:46:22  
Line bore the block and throw the shims away

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10-25-2002 17:32:25

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 Re: Engine problems in reply to Fred, 10-24-2002 18:46:22  
There is a very involved way to properly fit each bearing. The other posts advising shims are correct. You might want to get a manual to help make it all clear too. What I did was to measure the bearing (crank) put the shells in the rod or main bearing and just tighten finger tight and measure the inside diameter of the bearing, compare to the crank measurement. Also measure clearance between bearing cap and block or con rod. Now. You need to have .001 to .003 clearance. And you need to have (if I remember right) about .002 bearing shell "crush" on each side. Shim to get this after fileing the bearings carefully and evenly. I used a dial indicator on a flat machined surface with the ends of the bearing shell on the surface and indicating the highest point of the round. In this way I could file al little as 1/2 thou to get the porper crush. Don't go for it all at onee, when you get close install it and check with plastigage and keep adjusting down. To check with plastigage you need to torque to spec, remove the cap and look at the plastigage. At this point I only filed the half of the bearing shell in the cap, leaving the other one in the block or rod as I was usually only a bit from the .002 I was shooting for. It is a real balanceing act, took me a long time, sometimes several hours per bearing, I had to make some shims for my mains, was able to use the rod shims as I had enough and they are thin enough. Try to keep the thinkness of the shims the same from side to side, or very close, within .001 or .002.

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Dave K

10-25-2002 17:14:16

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 Re: Engine problems in reply to Fred, 10-24-2002 18:46:22  
Make certan you have the correct bearing cap on the correct rod. Make sure you use shims. I would follow the advice of steve and roll the engine over each time you install a rod/piston.


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10-25-2002 16:13:37

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 Re: Engine problems in reply to Fred, 10-24-2002 18:46:22  
Fred, like Ron said, the connecting rods have shims, not like a car motor. Allis use to put 3 shimms, .002 inch each under each bolt on the rod. that gave .006 on each side, that was supposed to give you .002 rod clearance. when the motor wore in, you took out a shim. this can be done a couple times. you should actually mike the journal and bearing, but you can add the .004 to each side and see if it rolls easily, then either take out .002 and try again, or add .002 to get your clearance. you can buy the small shims, or make your own, just torque the bolts and add the lock wire when finished last time. do one piston at a time and verify it is correct before you go to the next. roll the motor over between each test.

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10-24-2002 19:46:07

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 Re: Engine problems in reply to Fred, 10-24-2002 18:46:22  
There are supposed to be shims between the rod and the cap...!!! Adjust the rod clearance with the shims....


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Carroll Porter

10-25-2002 20:04:34

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 Re: Re: Engine problems in reply to Ron, 10-24-2002 19:46:07  
Sorry bout that, Ron is correct, don't forget about the shims. cp

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Carroll Porter

10-24-2002 18:53:49

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 Re: Engine problems in reply to Fred, 10-24-2002 18:46:22  
Connecting rod caps are mis-matched, or wrong size bearing insert. cp

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