All SMD experts - what is noise?

Dan MD · Nov 6, 2012

http://www.youtube.com/watch?v=P3S3uhHSEJ0

I finally got a link up of a video of my SMD I have been battling for the last year. This tractor has a complete engine rebuild and pump and injectors redone. Nothing was short changed.

This tractor has what I would call an abnormal idle flutter most pronounced unloaded and more so in the mid RPM range. You can really hear what I am talking about half way through the video. At the 10 second mark and then again at roughly 46 seconds I load the hydraulics for a few seconds so you can hear the difference a load makes.

Thanks for any input on what I am hearing.
Dan

rhtx55 · Nov 6, 2012

Water in the fuel ??

Dan MD · Nov 6, 2012

I don't think so. I have new fuel, new filters no water in the seperator. The entire engine was redone. I have tried the timing all over. I've reset the valves more than once. I've had the pump and injectors looked at more than once. I can't find the problem yet. Looking for help. The tractor seemed to run correctly after I put the last replacement pump on for atleast 10 hours but one day it died and it has had this strange idle ever since. I tried bleeding the injectors, but no change. I;m wondering if something got into an injector.

Dan

Janicholson · Nov 6, 2012

Is the muffler at all loose on the stack. if it can be wiggled, clamp it to see if there is noise there.
If you believe there is a pretty consistent misfire, use a laser pointed heat sensor on the exhaust ports to see if you can folow the misfire.
if it shows up as a cooler stack, change injectors from hole to hole to see if it follows the injector. Poor injector patterning can cause that sound. Jim

Dan MD · Nov 6, 2012

The muffler is tight. One thing I "think" I notice is the flutter becomes more obvious after the engine warms up. It seems after I try something, I fire it up and I think it sounds better. Then I take it for a good long drive and it starts becoming more audible and then when idling before shut down, it sounds a lot worse than when idling to warm it up.

jim warehime · Nov 7, 2012

Just a thought... since its a new engine and fuel system have you really broke the engine in? Maybe put it on a grinder mixer or some other belt or pto impliment and run the hell out of it and break it in. The mds were built as a work tractor not to putts around on. Both of mine run like crap when they just run here and there,work them hard they run great. Just my thought jim.

jim warehime · Nov 7, 2012

Just a thought... since its a new engine and fuel system have you really broke the engine in? Maybe put it on a grinder mixer or some other belt or pto impliment and run the hell out of it and break it in. The mds were built as a work tractor not to putts around on. Both of mine run like crap when they just run here and there,work them hard they run great. Just my thought jim.

Dan MD · Nov 7, 2012

It"s been on a dyno for a few hours and I"ve done PTO work with it. I still don"t think it should be idling like this. It runs rough enough at some RPM"s that I avoid those areas of the throttle. It gets worse than this video shows, this is just the best video I have of what I think is a problem.

Dan

billde · Nov 7, 2012

I get no results when i type that address into Youtube?

Dan MD · Nov 7, 2012

(quoted from post at 20:18:33 11/07/12) I get no results when i type that address into Youtube?

It works for me, not sure what it wrong. I wasn't able to pull it up at work, but works fine here at home.

Dan

thetractorfreak · Nov 7, 2012

Is whoever redid the pump a credible shop

Dan MD · Nov 7, 2012

(quoted from post at 01:33:37 11/08/12) Is whoever redid the pump a credible shop

Yes, Central Iowa Injection did this pump.

Dan

rhtx55 · Nov 9, 2012

Try this link:
http://www.youtube.com/watch?v=P3S3uhHSEJ0

Sounds like the throttle is "hunting" very slghtly.
Possibly a weak tension spring or the throttle linkage, by that I mean it is not holding the RPM's in place consistently.

Hard to tell from the video, sorry I couldn't be of more help.

Dan MD · Nov 10, 2012

(quoted from post at 01:11:23 11/10/12) Try this link:
http://www.youtube.com/watch?v=P3S3uhHSEJ0

Sounds like the throttle is "hunting" very slghtly.
Possibly a weak tension spring or the throttle linkage, by that I mean it is not holding the RPM's in place consistently.

Hard to tell from the video, sorry I couldn't be of more help.

That is what I thought, so I went through the throttle friction device and replaced the disks and have it set to spec. I also made new throttle linkage pins to take up any slop. Unfortunately, it didn't help with the noise.

Dan

ND856 · Nov 10, 2012

You said total rebuild, right? I'm assuming head,valves, injectors as well.
Fuel system was cleaned too? Its your pump. I love the sound of those old diesels. I've hot a W400D myself.
Good luck

Dan MD · Nov 11, 2012

(quoted from post at 18:23:39 11/10/12) You said total rebuild, right? I'm assuming head,valves, injectors as well.
Fuel system was cleaned too? Its your pump. I love the sound of those old diesels. I've hot a W400D myself.
Good luck

Yes, it has all new valves, springs and the injectors have been redone. I think it is likely in the pump also. Sadly this is the third rebuilt pump I have put on here. It ran good for the first 10 hours I had it on. Makes me think something may have passed through the pump. I do have new filters and cleaned all of that out too. The one thing I know that is wrong is the first filter doesn't have the top retainer piece to make it a perfect fit, but the fuel has to go through the final filter afterwards, so that shouldn't be an issue.

Dan

johndeere720diesel · Nov 11, 2012

My 560 will start running like crap when it sits and doesn't do much I'm with the other guy and think you need to find some sort of tillage equipment 3btm plow would be best and go work the snot out of it. Also my 720 only runs good when it has been doing field work other wise it'll miss once in a while so go work the old girl like she's meant to be worked for a couple hours and see what happens

All SMD experts - what is noise?

Dan MD

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rhtx55

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Dan MD

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Dan MD

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jim warehime

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Dan MD

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billde

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Dan MD

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Dan MD

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