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Farmall & IHC Tractors Discussion Forum
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1066 DT414 Rocker Arms

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BradM

03-19-2007 18:39:52




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Just put a new injection pump, injectors, valve job in, and a couple of the rocker arms were not oiling on the top, so I replaced the shaft and put all new rocker arms, and some of them are still not oiling on the top of the arms. Oil pressure shows approx. 55 at approx 1200 rpms. The rockers are pouring oil out around the shafts, but just not out the hole on top. What else is there to do? Thanks, Brad

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the tractor vet

03-19-2007 20:40:33




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 Re: 1066 DT414 Rocker Arms in reply to BradM, 03-19-2007 18:39:52  
Sometimes the hole in the rocker arm is not lined up just wright or there maybe a burr that has the hole pluged or it maybe that the fit of the bushing is to loose and this allows the oil to go out the sides more and not allow it to go up .



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Allan In NE

03-19-2007 18:50:00




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 Re: 1066 DT414 Rocker Arms in reply to BradM, 03-19-2007 18:39:52  
Is it a little hard starting to?

Sounds like you need to go back and finish the bottom end. That is not nearly enough pressure.

That tractor ought to idle at 75 ot 80 lbs.

Allan



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BradM

03-19-2007 19:01:19




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 Re: 1066 DT414 Rocker Arms in reply to Allan In NE, 03-19-2007 18:50:00  
No, it fires right off with no hesitation. The sleeves still had the crosscuts in them, and there's normal blowby, tractor ran great until injection pump went out.



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Allan In NE

03-20-2007 03:32:41




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 Re: 1066 DT414 Rocker Arms in reply to BradM, 03-19-2007 19:01:19  
For what it's worth, starvation of oil at the rockers (cylinders #3 or #4) is why IH redesigned the draft tube setup on that engine.

And, I gotta tell ya, 55 lbs of oil pressure @ 1200 rpm would just absolutely scare the ba-geebies out of me because something is just not right. Heck, they normally idle hot at 75 lbs.

Is this a high-houred engine? It still just smacks of being wobbled out on the lower end.

Dunno, sure hope ya get 'er figured out,

Allan

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the tractor vet

03-20-2007 06:12:48




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 Re: 1066 DT414 Rocker Arms in reply to Allan In NE, 03-20-2007 03:32:41  
Allen , I H went from the side breather to the top breather as a Hp. thing with a piston change cam and a few other things over the first 414's and 55 lbs. at 1200 RPM is nothing to get your shorts in a wad over , now if it had 45 lbs at full throttel then i would maybe start looken for a problem . High oil pressure take Hp. and also does not help bearing life as Cummins figured out . Also a lot of times electrical gauges do not read correctly along with some of the newer junk mechanical gauges that ya buy that are made across the pond. My 1486 was reading low on the dash gauge and i thought that i had a problem till i put my GOOD test gauge on it as the dash gauge only goes up 2/3rds. of the way at full throttel and drops off to about half at idel the mechanical gauge showes 60 at idel and 75 at full throttel hot .

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Allan In NE

03-20-2007 08:13:34




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 Re: 1066 DT414 Rocker Arms in reply to the tractor vet, 03-20-2007 06:12:48  
Not to throw this back in your face, but this isn't an 86 series with the little faggy electric gauge.

He's working on a 1066. It already has a mechanical gauge and the only electric thing about it is the light bulb. This is not to say that the gauge isn't faulty, however.

Yes, I know that amount of pressure will run it; that's not the issue.

My point is, where is all that oil going as compared to the norm? If he's only got 55 lbs with it wrapped up, that engine is screamin' at him that something is seriously wrong. Either with the gauge, with the oil not being there in the first place, or with it getting by somewhere (read: bad bearings/bad oil pump).

I'm no IH mechanic by any stretch of the imagination, but having owned four of the old dogs, I can tell you that 55 lbs is completely abnormal oil pressure and deserves at least a look into the "why" of the matter.

Allan

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Owen Aaland

03-20-2007 07:46:53




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 Re: 1066 DT414 Rocker Arms in reply to the tractor vet, 03-20-2007 06:12:48  
The change to pressure balanced rings/pistons made the change to the top breather necessary. These rings have a larger gap on the top compression ring to allow more combustion pressure to get to the second compression ring. There was a relief groove added to the piston to aid in this also. This was to help equalize the wear on the two rings to extend durability.

The increased gap also allows more blow by to enter the crankcase. This increased flow will carry oil thrown off of the camshaft out the side breather hole. The switch to the top breather was to correct this problem.

When replacing sleeves/pistons in an older engine with the side breather, the type of rings used will determine whether or not the breather location must be changed.

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