by propwobble » Sat Feb 27, 2010 8:01 pm
What kind of wrench did you try to use. Was it a strap wrench, pipe wrench?? Serious damage could result to the fins and possibly distorting the cylinder out of round depending on the method and how much force was applied.
In case I was not clear or detailed enough in my initial comment I'll elaborate. First you wrap the leather strap ( inch and half wide or so and of a length that is just short of equal to the measure of the circumference of the cylinder) around the cylinder, then you put a hose clamp around the leather and tighten it. Then you can get a good grip on the hose clamp for turning while protecting the cylinder from unequal loads and any tool marks. It works and it is a wrench of sorts.
I have seen the .49's but not the .60 so I cannot comment on protrusions on the back plate except that the back plate of the 1939 single stack and later twin stack engines that I have seen do not have them.