|Help with Standard/Reverse Rotation
Post Number: 3
|Posted on Saturday, December 18, 2004 - 12:18 pm: ||
Hello everyone, I am trying to figure out if an old block i have is standard or reverse rotation, The casting numbers on the ford block are D8VE-6015-A3A Z 7E11. I had been told that if the part number was even it is standard, and odd means reverse, but I would like to check here with the experts ;). Thanks in advance for your help.
Key Largo Fl
|Posted on Sunday, March 20, 2005 - 11:40 pm: ||
The best way to tell what rotation? is to pull #1 spark-plug and valve cover, figure which rocker is intake and which is exhaust for this #1 cyl.
Now rotate engine with a bar & socket watching the valve action and checking piston movements as it comes up on a compression stroke by holding a finget over the plug hole as you move the bar.
While turning crank on the compression stroke both valves will be closed past TDC top dead center and remain closed untill at the bottom of the power stroke when the exhaust valve will start to open and remain open till piston is up.
Then the intake valve will begin to open as the piston falls to the bottom when both valves will close again to start the compression stroke.
If the engine is being turned the wrong way none of this sequence will jive.
To really see this principle, take the head off of any one cylinder engine like your lawn mower and you will quickly understand this 4 stroke arrangement by observing the valve and piston movements and that if it is turned backwards you will see why it can not run this way.
Casting (raised) numbers on any block will not tell you the crankshaft rotation and sometimes even stamped in numbers don't do it?
I hope this helps?
Owner of Russ-Tec-Marine & Engineering Co.