Super MD Idle Flutter

DanMD

Member
Can any of you MD owners tell me if your tractor sounds anything like this at no load idle speeds? I have gone through everything on this motor and injection system at least once and I am stumped.

http://jmp.sh/gUjLUaP


Thanks,
Dan
 
(quoted from post at 04:41:29 03/29/17) stop spring on govenor, chipped tooth on
pump gear causing govenor to flutter? Just a
couple ideas.

Hi Jim,

I take it none of yours sound like this? I played with the governor, tried multiple pumps, new injectors, different precups, new timing gears and everything else I can think of. I almost wonder if the motor is too tight. It starts off sounding ok, but gets to sounding ratty like this after it gets good and warmed up.
 
I had this motor overhauled. It has new timing gears, sleeves, pistons, valves, valve seats. I've tried more than one rebuilt pump, precups, and two sets of injectors with the current ones being open face injectors with new valves. I actually had the motor done twice because I found the cylinders scuffed at the bottoms. The machine shop said he bored it to spec and they were CaseIH pistons, wasn't sure why it did it. He opened up the bores a little more. I'm almost wondering if the pistons are still too tight as the problems gets worse as it warms up. Im not sure if it turns over hard by hand or not because I don't have another to compare it to.

There is no smoke out the exhaust at all with this happening. It will only smoke if I set the timing pointer back 2 notches from zero. As I go down the line cracking injectors, nothing changes. If I drastically increase bumper spring pressure, it helps some. If I had a valve problem, would I see smoke puffs? I don't.

The pumps have all been set up for a Super MD. I din't know if it matters I have 450 injectors in it or not, soI tried a 450 governor spring and settings and it didn't change anything.

I have also taken compression readings through the spark plugs and get with in a few pounds of each other whether the motor is cold or warmed up. And no leakage of the starting valves.

How can I tell if the motor is too tight? If this is the problem, could it need to just get some run hours on it? I'm to the point where I think I should drop the oil pan again and have another look, but I really don't want to see a problem in there again.

I'm really at my witts end on this. I had it overhauled in 2011 the first time and only get to work on it in my spare time and as money allows and this is where I am at with a whole lot of money ------ away. The "Boss" is out of patience too.lol



Thanks,

Dan
 
Mine was similar in sound. YOurs sounds somewhat different as it is in a garage. I would make sure it was timed correctly and run
it for 20 hours under variable conditions and loads after the first 2 hours of medium duty. Jim
 

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