Simplified steam engine

Edit and compile if you like:

% Author: Izaak Neutelings (March 2019)
\documentclass[border=3pt,tikz]{standalone}
\usetikzlibrary{calc}
\tikzset{>=latex} % for LaTeX arrow head

\colorlet{knob}{blue!20!black!40}
\colorlet{mylightblue}{blue!10}
\colorlet{mydarkblue}{blue!30!black}
\colorlet{mydarkred}{red!50!black}
\tikzstyle{gas}=[red!10]
\tikzstyle{rope}=[orange!60!black,line width=1.5]

% ANGLE
\newcommand{\getangle}[3]{%
    \pgfmathanglebetweenpoints{\pgfpointanchor{#2}{center}}
                              {\pgfpointanchor{#3}{center}}
    \global\let#1\pgfmathresult  
}


% ENGINE
\def\engine#1{
  \def\Pw{2}   % piston width
  \def\Pl{3}   % piston length
  \def\Pt{0.5} % piston thickness
  \def\Cl{5}
  \def\Ct{0.2}
  \def\R{0.2}
  \def\Sw{3}   % platform S width
  \def\St{.4}  % platform S thickness
  \def\Sh{1.5} % platform height
  \def\hRP{1.32}
  \def\hSR{3.5}
  \coordinate (O) at (0,0);
  \coordinate (R) at (\R,\hSR);
  
  % PISTON
  \begin{scope}[shift={(-2.7,\hSR+\hRP)}]
    \coordinate (P) at (#1,0);
    \fill[gas]
      (-\Cl/2,-\Pw/2) rectangle (#1,\Pw/2);
    \draw[mydarkblue,thick,fill=blue!10!black!50]
      (\Cl/2,\Pw/2) --++ (0,\Ct) --++ (-\Cl-\Ct,0) coordinate (NE) --++ (0,-\Pw-2*\Ct)
      --++ (\Cl+\Ct,0) --++ (0,\Ct) --++ (-\Cl,0) --++ (0,\Pw) -- cycle;
    \draw[mydarkblue,thick,
          top color=blue!20!black!70,bottom color=blue!20!black!60,middle color=blue!20!black!30,shading angle=0]
      (P) ++ (0,\Pt/2) --++ (0,\Pw/2-\Pt/2) --++ (-\Pt,0) coordinate[midway] (PT)
      --++ (0,-\Pw) --++ (\Pt,0) coordinate[midway] (PB) --++ (0,\Pw/2-\Pt/2)
      --++ (\Pl,0) coordinate[below=1,left=4] (F) --++ (0,\Pt) coordinate[midway] (E) --++ (-\Pl,0) -- cycle;
  \end{scope}
  
  % PLATFORM (S) & ROPE
  \getangle{\a}{R}{F}
  \begin{scope}[shift={(0,{\hRP*(1/sin(\a)-1)})}]
    \draw[blue!20!black!90,thick,top color=blue!20!black!40,bottom color=blue!20!black!60,shading angle=0]
      (-\Sw/2,0) coordinate[above right=0.5] (SL)
      --++ (\Sw,0) coordinate[above left=0.5] (SR) --++ (0,-\St) --++ (-\Sw,0) -- cycle;
    \draw[rope]
      (SR) -- (0,1.5) coordinate (ST) -- (SL);
  \end{scope}
  \draw[rope]
    %(F) -- ($(R)+(90+\a:\R)$) -- ($(R)+(180:\R)$) -- (ST);
    (F) -- ($(R)+(90+\a:\R)$) arc(90+\a:180:\R) -- (ST);
  \fill[mydarkblue]
    (SL) circle (.04) (SR) circle (.04) (F) circle (.04);
  
  % PULLEY
  \draw[very thick,mydarkblue,fill=blue!40!black!50] (R) circle (\R);
  \draw[thick,mydarkblue,fill=blue!40!black!70] (R) circle (.3*\R);
  
  % PLATFORM
  \draw[blue!20!black!80,thick,
        top color=blue!30!black!25,bottom color=blue!10!black!12,shading angle=10]
    (-\Sw/2-0.04,0) --++ (0,-1) --++ (\Sw+0.08,0) --++ (0,1+\Sh) --++ (2.2,0) --++ (0,-2-\Sh) --++ (-\Sw-5.2,0) --++ (0,2) -- cycle;
}

\def\fix{
  \node[rectangle,draw=mydarkred,inner xsep=3,inner ysep=5,
        top color=red!90!black,bottom color=red!80!black,shading angle=20] at (PT) {};
  \node[rectangle,draw=mydarkred,inner xsep=3,inner ysep=5,
        top color=red!90!black,bottom color=red!80!black,shading angle=20] at (PB) {};
  \fill[mydarkred] (PT) ++ (0, .1) circle (.02);
  \fill[mydarkred] (PT) ++ (0,-.1) circle (.02);
  \fill[mydarkred] (PB) ++ (0, .1) circle (.02);
  \fill[mydarkred] (PB) ++ (0,-.1) circle (.02);
}

\def\mass#1{
  \def\Maw{.8}
  \def\Mbw{1.6}
  \def\Mh{.8}
  \begin{scope}[shift={(#1+.027)}]
    \draw[thick,green!40!black,
          top color=green!40!black!60,bottom color=green!40!black!70,shading angle=10]
      (0,0) ++ (\Mbw/2,0) -- (\Maw/2,\Mh) -- (-\Maw/2,\Mh) -- (-\Mbw/2,0) -- cycle;
    \node[scale=1.2] at (0,\Mh/2) {$m$};
  \end{scope}
}

\def\fire{
  \begin{scope}[shift={(-2.7-.3*\Cl,\hSR+\hRP-\Pw/2-1)}]
    \draw[thin,red!80!black,fill=red]
      (-.3,0) to[out=100,in=-80] (-.32,.8) to[out=-70,in=100] (-.14,.4) 
              to[out=70,in=-130] (0,.8) to[out=-80,in=90] (.15,.3)
              to[out=80,in=-100] (.27,.7) to[out=-70,in=70] (.3,0)
              to[out=-110,in=0] (0,-.09) to[out=180,in=-80] cycle;
    \draw[thin,orange!80!black,fill=orange]
      (-.28,0) to[out=100,in=-70] (-.26,.6) to[out=-70,in=100] (-.15,.3) 
               to[out=60,in=-130] (0,.65) to[out=-80,in=90] (.13,.2)
               to[out=60,in=-120] (.28,.55) to[out=-80,in=70] (.27,0)
               to[out=-110,in=0] (0,-.08) to[out=180,in=-80] cycle;
    \draw[thin,yellow!90!black,fill=yellow]
      (-.24,0) to[out=100,in=-80] (-.21,.32) to[out=-70,in=100] (-.17,.17) 
               to[out=50,in=-100] (-.02,.42) to[out=-90,in=90] (.09,.08)
               to[out=55,in=-120] (.25,.3) to[out=-95,in=70] (.23,0)
               to[out=-110,in=0] (0,-.07) to[out=180,in=-80] cycle;
  \end{scope}
}


\begin{document}


% START
\begin{tikzpicture}[scale=0.7]
  \engine{0};
  %\node[right=14,above right=1,mydarkblue] at (NE) {$P_1$, $V_1$};
  \node[below=7,below right=7,mydarkblue] at (NE) {$P_1$, $V_1$};
  \fix
  \mass{-3,0}
  \fire
\end{tikzpicture}


% LIFT
\begin{tikzpicture}[scale=0.7]
  \engine{0};
  %\node[right=14,above right=1,mydarkblue] at (NE) {$P_1$, $V_1$};
  \node[below=7,below right=7,mydarkblue] at (NE) {$P_1$, $V_1$};
  \mass{0,0}
  \draw[->,thick,mydarkblue] (E) ++ (0.4,0) --++ (1.4,0);
  \draw[->,thick,mydarkblue] ($(ST)+(-.4,.3)$) --++ (0,1.2);
  \fire
\end{tikzpicture}


% TOP
\tikzstyle{gas}=[blue!10]
\begin{tikzpicture}[scale=0.7]
  \engine{2};
  %\node[right=14,above right=1,mydarkblue] at (NE) {$P_2$, $V_2$};
  \node[below=1,below right=13,mydarkblue] at (NE) {$P_2$, $V_2$};
  \mass{0,\Sh}
  \draw[<->,thick,scale=1.1,mydarkblue] (-.6*\Sw,0) --++ (0,.91*\Sh) node[midway,left] {$h$};
\end{tikzpicture}


% SLIDE
\begin{tikzpicture}[scale=0.7]
  \engine{2};
  %\node[right=14,above right=1,mydarkblue] at (NE) {$P_2$, $V_2$};
  \node[below=1,below right=13,mydarkblue] at (NE) {$P_2$, $V_2$};
  \fix
  \mass{2.6,\Sh}
\end{tikzpicture}


\end{document}