[Supras] HELP: Weired piston height

[Bob Shapton]

If the rod has a slight bend in it the piston height will be lower. What could 
cause it to bend? ... blown head gasket at some point leading to hydro-lock 
.... rope in #1 cylinder to prevent engine from turning while torquing crank 
pulley to 170 ft/lbs .... or ??

Bob

> Man, if I ever needed help from knowledgeable people in this good
> group, 
> now is the time.
> 
> I got the head off my newly bought '91 turbo to lap the deck and
> install 
> a Cometic gasket and rebuilt head.  While cleaning the piston
> crowns, I 
> noticed that the first cylinder piston crown is about .100" lower
> than 
> the others.  Measuring it and piston 6 to the deck, the .100"
> additional 
> depth is always there!.  There is no vertical slop indicating bad 
> bearings or a bad wrist pin.  That was tested by turning the engine
> over 
> to pull #1 piston down in the bore, and then tapping down on its
> crown.
> 
> All of the bores are just about at the factory initial size (3.270"
> measured with an inside micrometer.  #1 piston crown looks fine. 
> All 
> are stock turbo pistons.  There are some very light scratches at the
> backside of the bore but no top ridge in any of the cylinders. 
> 
> This is the weirdest thing I've ever seen.  Is there any chance that
> it 
> was assembled with a piston or rod from a different year?  The
> engine 
> ran fine before disassembly.  Any and all suggestions would be very
> much 
> appreciated. 
> 
>        BernieK
> 
> 
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