Message text written by "Phil A."
>An other question is when installing piston rings, they says in the manual
to install them between the gudgeon pin and the thrust face of the piston.
What and where is the thrust face of the piston? I speak french and the
dictionary didn't help!
<
Philippe, je parle englais et je ne peu pas comprendre aussi.
Seriously, the thrust face is the side of the piston where the maximum
pressure is applied against the cylinder wall. As the piston moves down
the cylinder the crank rotates and the bottom end of the piston rod moves
off to one side. The pressure of the combustion gases pushes down on the
piston but the rod pushes up at an angle and the result is there is an
uncompensated sideways force exerted on the piston that forces it into the
cylinder wall. This is the thrust side.
Which side is it? Sometimes the pistons are marked indicating the thrust
side. They are usually marked "Front." But if the pistons have been used
these markings may e obscurred. I can't remember which way the engine
turns but I think it is counterclockwise (anticlockwise) (dans le sens
contre des aguilles d'une montre) which means, as you look at the engine
from the front, the bottom of the rods will move off to the left making
the thrust face the right side.
I have never paid attention to this detail when assembling engines, I
mostlypaid attention to staggering the ring gaps evenly so that they didn't
line up.
J'espair que je vous aide un peu. Si je peu l'expliquer en francais, je
fisse.
Bon chance
Dave Massey
St. Louis, MO USA
1980 TR8
I speak english and I can't figure it out, either.
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