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CATEGORY LISTINGS > CUMMINS > N14 broken push rods [ REFRESH ]
Thread Title:

N14 broken push rods


Created On Thursday January 15, 2015 12:41 Diesel Talk
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mpolk
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Note Thursday January 15, 2015 12:41 View thread in raw text format
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I have a N14 cummins that has all three push rods broken on cylinders 6 and 2 anyone have any ideas what could have caused this to happen
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Brent
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Note Thursday January 15, 2015 17:26 View thread in raw text format
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Just guessing but over speed down a hill?
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mpolk
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Note Thursday January 15, 2015 17:40 View thread in raw text format
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I don't think that happened.......we put the truck in shop for oil leaks, ended up replacing head gaskets, when got it out driving bobtail it would run great up to 1500 rpm then fall on its face and would not pull a load, poor power, has speed sensor code, found and fixed wiring problem at sensor.......had little miss and still no power wouldn't run over 1500 rpm........I listened to it and it sounder like a dead miss to me.......fast forward to finding all 3 push rods bent/broken on two cylinders 6 and 2

I don't know what could break all three push rods on two cylinders, I have not seen it before

I first thought maybe set overhead wrong but 6 and 2 are not set together and the other 4 cylinders are fine....any help is appreciated
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Brent
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Note Friday January 16, 2015 17:02 View thread in raw text format
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I have had the push tubes not in the socket right and did catch it till I was baring it over and popped in. Is it possible the injector tubes mixed in valve tubes?
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mpolk
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Note Saturday January 17, 2015 17:36 View thread in raw text format
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I cant say that did not happen but it had ran up and down the road several times on test drives after and work was done prior to the miss showing up. I have had people say lugging it or over rev-ing could cause it but I have never had it happen before and I do not understand mechanically how it could happen, I have heard of being out of position in the push tubes like you mention but I assumed you would never get the overhead ran if that happened?
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Brent
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Note Monday January 19, 2015 17:38 View thread in raw text format
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I am baffled too. Done a lot of n14 and have never seen 1 broken push tube. Seen 855 rap push tubes around a cam. Is it running fine now? About the time you get older and think you seen it all something happens that brings you back to you never stop learning.
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JoeZ
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Note Wednesday January 21, 2015 04:31 View thread in raw text format
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My guess is that the push rods were bent...maybe slightly when it was assembled....maybe up on the cam follower....anyway, they were then put in their proper position, adjusted, and then bent when the engine reached higher RPM.
I'm just not buying the lugging or over reving theory....especially if it has not done anything like this before.
Just not a N14 problem....they just don't have valve train issues.

-------------------------
One of the last 2 Stroke mechanics left.
44 years in the business and worked on everything from 53 series to 149 series. Winding it down now...time to move on.
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westcoast
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Note Wednesday January 21, 2015 08:03 View users profile View thread in raw text format
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Tuned on the wrong setting Regards David

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detroit
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mpolk
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Note Thursday January 22, 2015 12:50 View thread in raw text format
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I just cant figure out mechanically how it could do it.
Is it possible to set injectors wrong and bend our break a pushrod.
My father is wise and be said it was probably possible by over rev but we do not believe that was it. He said he had heard it could happen if it was ether locked trying to start it, we don't know that happened but could have I guess
I don't see how running overhead wrong could even do it
We are still at a loss
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mpolk
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Note Thursday January 22, 2015 12:53 View thread in raw text format
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westcoast Please explain what you mean when you say "Tuned on the wrong setting"

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westcoast
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Note Monday January 26, 2015 01:37 View users profile View thread in raw text format
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I,ve seen blokes start their tune up on the wrong stroke , adjust the first two cylinders -then find it,s hard to turn over to the next setting .They,ll go back and check and start on the right setting but usually two or three pushrods will have a bow in them . Also if the auxillary drive has been replaced and not timed correctly it will put your timing marks on the pulley out . Regards David

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detroit
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mpolk
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Note Monday January 26, 2015 17:47 View thread in raw text format
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You may be right on that....it 2 and 6 I don't think they are on same timing cycle but they are together in firing order...would it be reasonable to that to effect those two cylinders?
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Brent
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Note Wednesday January 28, 2015 17:13 View thread in raw text format
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N14 tunes up valves and injector on the same cylinder at the same time. If I remember right its called out base? .014 intake, .027 exhaust, Bottom injector back off 2 flats. Is a torque on bottoming out the injector but I don't remember what it is with out looking it up.
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JoeZ
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Note Thursday January 29, 2015 02:29 View thread in raw text format
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The accessory drive is marked 1-6 TC and 1-6 VS, 2-5 VS and 3-4 VS or A B and C. A=1-6, B=2-5, and C=3-4. The A,B, and C confuse some people. Just understand that the injector stays at the bottom (down) until just before it's stroke when it raises up to let in fuel.

-------------------------
One of the last 2 Stroke mechanics left.
44 years in the business and worked on everything from 53 series to 149 series. Winding it down now...time to move on.
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westcoast
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Note Thursday January 29, 2015 08:14 View users profile View thread in raw text format
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Follow the firing order , two follows six Regards David

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detroit
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