Turbine Housing Removal Woes

[R.E. Miller]

Good to hear you are on your way to spooling up

The square gasket is for the HX-40 turbo, I don't think it should be a problem using it. If you want to test for leaks, an easy way is to have someone hold a light over the gasket area at night, and fire your truck up. You'll see the soot shoot out when it starts real quick. Happy BOMBING



Russell

 

[BushWakr - RIP]

I was discussing your very situation with Al at PDR today. He was of the opinion that it should have the center piece, if the housing has a center divider in the casting.

My personal opinion and reasoning is this, it should have the center 'divider' portion on the gasket, if for no other reason than possible "errosion" of the center divider casting. Also, misdirection of exhaust gasses/turbulence.

Now, I may be wrong and it won't matter a hoot, but my gasket had the divider on it, and it was a Holset housing/gasket (s) .

This kinda makes me nervous a bit, but I don't have any solid practical proof.



Bob.

 

[JLEONARD]

Bob,

Apparently Holset is supplying the gasket at random. . sometimes with the divider, sometimes without.

I think I'll put the old gasket back with the divider, and see if the turbo spooles up differently.

 

[JHolt]

test drive

Well I put it all back together and it's working fine. I missed a meeting at work while finishing it up... DOH! Turns out the gasket kit was from Holset. I'll use this gasket for now since I don' t have time to track down a new one with the divider, and maybe in the meantime you guys will figure out that it doesn't matter!



I have only driven it a little bit (30 min. ), and I do notice a difference, especially when accelerating in 4th and 5th gears. More boost than before, too (about 10 psi unloaded while accelerating fairly hard but not WOT). It doesn't behave much different than before coming off the stop light, but I'm sure I need to tweak the pump a bit. The EGT response is sure a lot faster with the pre-turbo location. I was seeing some 750 F temps during the test drive.



I turned in the full load screw a while back, before changing the housing, as far as I could without removing the metal collar. It had MUCH better acceleration and made more boost (about what it's making now), but smoked a LOT, so I backed it off to the stock position and that's where it's at now. I don't think that 21cm housing was spooling it up fast enough to deliver the air to match the fuel.



I've read a lot of stuff on pump adjustments inthe past. Given my setup, what would you guys recommend for initial, easy adjustments... a tweak of the smoke screw or the full load screw, or both?



At the moment I don't have time to take things apart and mess with the diaphragm eccentric or timing. Timing should still be at 1. 25mm, although I should confirm that sometime soon. Pump was rebuilt about 20k miles ago, installed by a Cummins shop.



I'm not convinced that my little Honeywell boost gauge is correct, although it matched my compressor gauge up to about 25 psi when I was testing the intercooler system for leaks.



Thanks for all the help on the turbo housing!



Jack

 

[Stab]

Divided turbo housing gasket kits: Garrett #410302-0000.

5. 39 ea.



Let me know if you need any I have plenty on hand.

Any other turbo kits also.