<html><head></head><body><div class="yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div>I am reassembling my Farmall H there is something that has me puzzled. From the body of the air cleaner to the back of the head there is a line. Over the valve Train the is a tube that goes from the back of the head to the front. What function does this serve?</div><div><br></div><div>Thanks</div><div>Ray</div><div><br></div><div>Farmall H</div><div>Farmall Cub</div><div>John Deere MT</div><div>John Deere B</div><div>John Deere 2020</div><div>Allis D10</div><div>Massey 65<br></div><div> <br></div></div></body></html>