HT10B Turbocharger Specs & Pics

Turbocharger repairs, alternative options and mods
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Charlie @ Evergreen
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Re: HT10B Turbocharger Specs & Pics

Post by Charlie @ Evergreen »

Have not posted builds for some time so need to get my act together post more. See many Hitachi's HT10s every month.
Here some build pics of Barrys Billet turbo build with ceramic coated Header, Turbine Housing, Flanges.
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Charlie @ Evergreen
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Re: HT10B Turbocharger Specs & Pics

Post by Charlie @ Evergreen »

Amazing how many 750 Turbo's are being resurrected. Still receiving turbos every month after all these years.

Received two from VA both a mess literally as you will see in pics. The first one had ingested something and tore blades of the compressor wheel leaving the cone. The Turbine wheel had pieces of a piston or other object go thru the turbine blades tearing off the tips.

The second turbo was locked up solid from water. Lot of damage to turbine wheel but it machined up at minus .010 and opened seal plus .010
Set up also included line boring bearing housing .005 cleaned up excellent. Billet upgrade for both turbos.

Turbine Housing needed all 4 broken bolts removed and tapped.

Here are pics of combined parts to build the first billet upgrade turbo.

Just a note working on having new higher flowing 9 blade turbine wheels manufactured. EST time line is about August. Excited!
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T 1 compress.jpeg
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T1 TH.jpeg
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T 1 CH.jpeg
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R 1 BH.jpeg
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Charlie @ Evergreen
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Re: HT10B Turbocharger Specs & Pics

Post by Charlie @ Evergreen »

Finished pics of the above turbo #1
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Build BH.jpeg
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Charlie @ Evergreen
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Re: HT10B Turbocharger Specs & Pics

Post by Charlie @ Evergreen »

Finished Billet Upgrade HT10
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build turbine side.jpeg
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Build Billet CW.jpeg
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riturbo
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Re: HT10B Turbocharger Specs & Pics

Post by riturbo »

Wow :clap nice job . :beer
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Re: HT10B Turbocharger Specs & Pics

Post by rangeroy »

Jeez Charlie, unbelievable what you can do :thumbup
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Charlie @ Evergreen
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Re: HT10B Turbocharger Specs & Pics

Post by Charlie @ Evergreen »

4 Hitachi HT10s & new Oil Check Valve Supply Lines headed for France.
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Charlie @ Evergreen
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Re: HT10B Turbocharger Specs & Pics

Post by Charlie @ Evergreen »

4 Hitachi HT10s & new Oil Check Valve Supply Lines headed for France. All 4 Turbine Shafts Ground -.005 as was all 4 Bearing Housings Line Bored Plus .005
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nadrol
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Re: HT10B Turbocharger Specs & Pics

Post by nadrol »

Charlie,

Do you have a spec for how much oil these HT10b turbos should flow at idle? I've only found one post mentioning .25L/min.

For reference, I have a non-turbo motor i'm doing a conversion on and I want to make sure the turbo isn't getting too much oil. It's a TD025-8T (similar in size to the 10B) with a 4AN feed off of the main galley. Turbo has an integrated restrictor in the CHRA.

Also, do you know if stock 750 turbos typically meet the spec'd oil pressures from the manual?
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Charlie @ Evergreen
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Re: HT10B Turbocharger Specs & Pics

Post by Charlie @ Evergreen »

Hey, need to check but believe the oil pump on the N/A and turbo is the same. If so this oil pump is weak and we usually suggest upgrading to the ZR7S pump listed in How To with other upgrades. The stock pump discovered years ago when doing my own turbo was very low oil pressure. The new turbo built would lay down and stop spinning at idle which had set at 900 back then then start spinning again. Thought did something wrong with my own turbo and tore it apart finding everything in spec. Re installed and put a main galley pressure gauge on right side to monitor oil pressure. Start up and was like 60 lbs! But once it got hot went way down to think 15 lbs! Just turning the idle speed up to 1100 at idle brought up about 19lbs and it did not stall the turbo out. So the upgrade pump change will put your idle pressure about 28 to 30 lbs and also change the check valve in oil pan. Both PN's are listed to get the correct setup. There is also picture showing what did back then and the differences in the components.

As far as a restrictor you should not need one. The Mitsubishi must have had someone machine something up to fit in the oil supply port. Unless your looking at the machining of the oil feeds in the bearing housing which are also very small to feed the journal bearings and thrust set.

Key will be how are you draining the turbo system? You do not have a scavenge pump and if you mount it low as factory setup will never get the oil out and it will leak thru seals like crazy. You would have to install a remote scavenge pump to make this work and still use a check valve supply line to prevent bleed back issues after shutoff.
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Re: HT10B Turbocharger Specs & Pics

Post by nadrol »

Thanks for helping me out with this, see responses below.
Hey, need to check but believe the oil pump on the N/A and turbo is the same. If so this oil pump is weak and we usually suggest upgrading to the ZR7S pump listed in How To with other upgrades.
Yes, that is my understanding as well. I already have the ZR7S pump installed, but i'm getting ~10psi at hot idle and 25psi at 4krpm (I believe, I haven't worked on this thing in a while, but I know its not where it should be). It was a used pump so I need to pull it and check clearances. I will take the opportunity to check over the pan orings, relief valves etc etc. Will continue to check the oil system clearances upwards in the motor from there.
As far as a restrictor you should not need one. The Mitsubishi must have had someone machine something up to fit in the oil supply port. Unless your looking at the machining of the oil feeds in the bearing housing which are also very small to feed the journal bearings and thrust set.
It is down in the casting, not at the oil feed port (which has an AN fitting adapter screwed in). I need to look at it again because i do not remember the exact details of the built in restrictor. Want to say there was just one restrictor hole in the oil feed port (which would then split off to the various bearings). I remember the restrictor being fairly small... 1mm maybe?
Key will be how are you draining the turbo system? You do not have a scavenge pump and if you mount it low as factory setup will never get the oil out and it will leak thru seals like crazy. You would have to install a remote scavenge pump to make this work and still use a check valve supply line to prevent bleed back issues after shutoff.
I have my turbo mounted higher up and with a external sump, filter and pulse pump. No check valve as i am relying on the large sump and the pulse pump running before and after the engine stops to prevent over flow. sump has a level gauge on it, so this is something im keeping in mind.
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Charlie @ Evergreen
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Re: HT10B Turbocharger Specs & Pics

Post by Charlie @ Evergreen »

Did you install the upgrade pressure relief valve in oil pan? It is a stronger piston and spring then the old ball bearing light spring design. That may be why your oil pressure is down??? :popcorn
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Re: HT10B Turbocharger Specs & Pics

Post by nadrol »

Charlie @ Evergreen wrote: Thu Jul 13, 2023 12:55 am Did you install the upgrade pressure relief valve in oil pan? It is a stronger piston and spring then the old ball bearing light spring design. That may be why your oil pressure is down??? :popcorn
Yeah, I do have the piston style pressure relief. Quite the predicament. Will take the systematic approach starting from the oil pump and working from there.
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Charlie @ Evergreen
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Re: HT10B Turbocharger Specs & Pics

Post by Charlie @ Evergreen »

I would verify you got the correct oil pump PN

Should be
ZR7S Oil Pump PN 16082-1158
ZR7S Relief Valve PN 16130-1058
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Charlie @ Evergreen
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Re: HT10B Turbocharger Specs & Pics

Post by Charlie @ Evergreen »

Post from my business page on FB.

Seen so many turbos rebuilt by other places. Do not name names they know who they are. Do not do the machine work. Just change parts and charge twice what charge. Really burns my ass when I see this kind of garbage work. Only good thing done was adding the stock size billet compressor wheel that is available. See link for the pics and text.


https://www.facebook.com/EvergreenTurbo ... =-UC%2CP-R
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