he351ve reassembly

Rollin Coal

Rollin Coal

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Joined
Oct 25, 2008
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vgt collar is stick once i put the vband clamp on. works smoothly until that point. I read somewhere they have to be indexed, any truth to this?
 
I think people have had good luck moving the collar as you tighten the clamp. This should allow it to be free once the clamp is tight.
 
move the whole charger? the collar cant be reached as far as i can tell once the chra is put on.

i have no issues getting the fins lined up, its after its dropped and gets tightened.

Thanks
 
if you are looking at the turbo from the front (intake) turn the center section counter clock wise as you tighten the clamp and move the arm. works every time on mine..
 
how free does this need to be, i can easily move it with one finger, but it still catches gently about 1/2 was through its travel
 
thats probably the snap ring catching on some of the soot that is built up on the collar, i cleaned mine up with some fine sandpaper. also it should move much easier after you have it on the truck, warmed up with oil flowing through it.
 
bna5017 said:
thats probably the snap ring catching on some of the soot that is built up on the collar, i cleaned mine up with some fine sandpaper. also it should move much easier after you have it on the truck, warmed up with oil flowing through it.
Click to expand...

do i need to take it apart again to clean it up or will it be ok
 
i'd probably make sure that its clean, if its dirty you're gonna have to take it apart eventually anyway.. plus its not hard to do..
 
when its apart it appears that way. but when you put the exhaust housing on it will not. its there to clean the soot off of the collar. its squeezed in between the center and the exhaust housing.
 
Anyone have the procedure for setting the VGT shroud extension position correctly upon reassembly?

I assume the hole in the sector arm/gear is lined up w/ one of the 2 holes behind the sector arm swing - in the pad.

But don't know how far in/out the shroud should be, when tightening the internal clamp that tightens down on the sector arm shaft?

I'd figure the sector arm hole should probably be aligned w/ one of the holes behind the arm in the pad - for setting the depth of the VGT shroud.

Then the arm/hole should be aligned with the 2nd hole in the pad, to be located/indexed correctly when mating up the actuator.

Anybody have any documentation on this?

Seems the HE351ve is one of the few service manuals not on Holset's website.
 
im not quite sure im following you. I didnt do much more than take the housings off, but as far as indexing the arm to the actuator, i have no clue because im not using electronics on mine.

if this isnt what youre referring to, let me know i will try to help.
 
I'm a ways from install, but intend to use the Holset onboard processor/actuator in conjunction w/ the standalone controller Fleece is working on.

I parted the turbo completely - both to confirm shaft/bearing tolerances were good & to gently bead blast & otherwise clean everything associated w/ the VGT mech. As it was one of the ebay good deals, I wanted to check it out & also be starting out w/ a butter smooth/free VGT mech.

The VGT mechanism internal in the ctr section basically clamps onto the thru shaft the external sector arm/gear is on. So the orientation the internal mech clamps onto the shaft affects/locates how far in/out the shroud is.

So I need to figure out what the sector arm location spec & shroud in/out spec so that internal clamp is oriented just right on the shaft. So the shroud in/out is where the electronics "think" it is/should be.

Would imagine there's got to be a Holset established procedure on this. Just a matter of finding the documentation - or I guess just measure one that we're certain hasn't been disassembled since new.
 
There's actually little rubber locator you can get from cummins. It's got one little nipple that goes into the hole by the arm. Just line up the arm with the line on the rubber locator then slide the locator out and you're set. Or atleast ready to calibrate the electronic actuator...

Oh BTW, make sure you get the rubber locator for the turbo specific turbo model. Their is different ones for the 3, 4 and 500 series

Looked on quickserve. The rubber locator otherwise called an "inspection gauge" tool number:4919281

Hardest part is calibrating the actuator the arm, need Cummins insite to do so
 
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I understand lining up the arm. And having the actuator "set" with Holset software so the actuator is in the right orientation when mating it back to the arm/turbo ctr section.

My question is how to know the correct location to clamp down the internal mechanism on that shaft? It could be tightened down on the shaft that goes thru the ctr section at any point 360 degrees relative to the sector arm.

There must be some measurement (how far the shroud is extended, etc.) with the sector arm/gear orientation located by that tool that goes thru the arm hole into a hole in the base. Or maybe the shroud should be all the way retracted w/ the arm holes lined up?
 
Here's a link that shows the internal mechanism (albeit w/ their pneumatic/piston actuator).

www.cummins.com/turbos - VGT

If you look at the shaft that rocks, you can make out the fastener that tightens to clamp onto that shaft. With the animation, you can see where you clamp it, relates to how far the shroud is extended at a given shaft orientation.
 
oops, my bad for wrong information. Maybe I have better info this time.

Quickserve says (this is an older air actuated vgt but still the same) that during dissambly a mark should have been made for the arm for rotation. Or the set point of the arm compared to vane position. I'll try some more looking for a "what if there's no mark". As for how far the cross shaft goes into the center section, use a .030 feeler gauge between arm and center section.
 
Yes, have to admit, not making some kind of reference mark & measurement was a whoops on my part. I plan to contact a local turbo shop that does a lot of Holset work to inquire if they've got the laptop software to "set" the actuator for reassembly. If they can provide me the correct setup spec/procedure, I'll post what I find out.

Has anybody run across the service manual online for the HE351ve? So many of their turbo serv. manuals are available online, but not so much for the HE351ve. I've got the basics - radial & axial runout specs & comp wheel nut torque, but would like to have something more complete - I'm somewhat comparing w/ the HE431 manual for now.
 
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