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-   -   Question: New Holset HX35W shaft play (https://www.dieselplace.com/forum/63-gm-diesel-engines/21-6-5l-diesel-engine/948170-new-holset-hx35w-shaft-play.html)

beak7707 01-16-2018 08:39 PM

New Holset HX35W shaft play
So I have been slowly working towards my turbo swap. Have already acquired raceday's install kit, and manual wastegate control. I had planned on a CKO turbo but found what I thought was an excellent deal on a true Holset. The Holset was said to be NEW and it does appear to be new, clean as can be and still has sticker over info plate. Has the 14cm exhaust housing with a 7 blade billet compressor wheel. The best part I didn't pay a whole lot more than I would have for a CKO. The issue is I feel it has excessive shaft play for a brand new turbo. That being said this is the only new turbo I have ever messed with so not much to compare it to. It has 0 in and out play which I know is a good thing. But it defiantly has side to side play, it doesn't rub or anything but most defiantly has movement. I read somewhere that once it has oil in it this will go away?? It's stupid cold in Indiana at the time and the install isn't going to happen until it warms up. I was just wondering if I need to try to return this thing or if its normal? I'd hate to have a true Holset that's got more slop than a CKO. I wanted to go Holset for piece of mind, not sure at the moment I have that piece of mind.

sctrailrider 01-16-2018 09:38 PM

First off, does it have "14" cast inside the turbine flange ??

Where did you find this turbo??

The shaft will have some looseness to it dry, the oil pressure will/should tighten it up..

Can you post some close up pics of it?

beak7707 01-16-2018 10:45 PM

3 Attachment(s)
Yes its stamped 14cm inside exhaust housing. Here are the only pics I have at the moment.

beak7707 01-16-2018 10:46 PM

The numbers stamped on the housing all seem to jive with Holset numbers from what I can tell.

KRRZ350 01-17-2018 07:08 PM

A little in and out play is normal. Very slight side to side play is normal as well. You should be able to feel the side to side play, not see it.

KRRZ350 01-17-2018 07:11 PM

Also, if you are wanting more whistle out of the turbo, take off the silencer ring around the inside of compressor housing

beak7707 01-17-2018 07:28 PM

I can see and feel side to side play, no in and out. Anybody else have input on this? He said he will swap me out with another. But I'd hate to pay $40 in shipping if the one I have is OK.

1967KaiserM715 01-17-2018 09:46 PM

I'm no expert, but most I have seen have just the tiniest amount of play.

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DieselPro 01-17-2018 10:01 PM

Side play is normal. As long as the wheels don't rub it's O.K. The side clearance is from clearance in the turbo center housing and the bearing. Typically the shaft to bearing clearance is .0015" to .002" The bearing to housing is about .0015" to .003". When you add the clearances up you can see you will have some slack. The engine oil pressure will "float" the bearing and shaft. The assembly will then center itself and spin true to center.
I use to build turbos. We had one application on a rather larger turbo that always felt sloppy due to factory tolerances. I finally cured the rebuilt sloppy problem by Installing the bearing with Vaseline. Never had any more loose turbo shaft complaints. Vaseline took up the slack till they fired'r up.

beak7707 01-17-2018 10:15 PM

Thanks guys. I found Holset's tolerances, says .0013-.0020" for side to side shaft play. I'll test it with the dial indictor tomorrow. It does not touch the housings, with the wheel pulled all the way to one side I could still get a .005" feeler gauge between wheel and housing. I just remember the CKO turbo catching a lot of flack because one member received one with excessive shaft slop. Didn't remember if it was a radial or axial problem he had with his turbo. Its definitely a new turbo and has no in and out movement, so I'm hoping I'm over reacting. I was just thinking a new Holset was going to be a lot tighter than my wore out GM4. I had also read about the oil tightening things up. So I'll measure tomorrow and report those numbers. All you guys with the CKO turbo's, You have much side to side shaft play?

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