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Re: [Mgs] Fore and Aft Rod Movement

To: "BDavis" <>, <>
Subject: Re: [Mgs] Fore and Aft Rod Movement
From: "Paul Hunt" <>
Date: Mon, 19 Oct 2009 08:54:45 +0100
I've not examined the 4-cylinder in as much detail but on the V8 the 
little-end is free to slide the full exposed width of the gudgeon pin, and 
the 4-cylinder does look the same.  With the big-end on the crank then the 
only way it can move sideways is if the crank has some end-play, the big-end 
has some float on its journal, or the bearings at both ends are very worn 
allowing it to rock.  If you can slide the whole con-rod i.e. both big and 
little ends are sliding back and fore the same amount then it is the first 
two, but if the big end is remaining in position while the little end rocks 
from side to side then it is the third option.  Some movement is almost 
inevitable as there must be some clearance in the bearings.  Multiply the 
clearance in the big-end by the ratio of the big-end width to the con rods 
length and you will get an idea of how much movement there may be at the 
little end.


----- Original Message ----- 

> Can there be 'any' lateral (forward - backward) rocking movement of a rod, 
> up at the piston, when the piston is at TDC (no rings on the piston)?


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