Re: MD compression

Posted by JD68 on February 03, 2004 at 16:43:04 from (69.19.22.152):

In Reply to: MD compression posted by Ray on February 03, 2004 at 15:06:25:

Ray with that compresion you'll be lucky to start on gas, forget about going over to diesel.
Your description is a little vauge.
Be sure you have the starting handle in the diesel position when you do the compression test. I have the IH maual for the MD's and there is no compression spec listed but it needs to be at least 350 lbs for the fuel to ignite.
There are four starting valvesin the head that are opened up when the starting handle is pushed foward. This reduces the compresion so it will start on gas and warm up. These valves get sticky valve stems and don't close properly
which will keep the compression low.
With 40 lbs in one cylinder it could be an intake or exhaust valve, or rings.
Well I guess you have alot of checking to do.
Good luck, there a great tractor when they run right.
BTW...when you do get it running,before you shut it down be sure to change back over to gas. This allows the head to cool down. Doing this will save you a world of greif with bend valves and head cracks. After you shut it down be sure the starting handle is back (in the diesel position) this keeps the starting valves seated and allows them to cool off.
I'm rambleing on here but if I can help .....yell

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