r/EngineBuilding • u/Knoxes • 2d ago

Turbo clocking

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This is actually a marine turbo, but I thought this would be a good place to ask. As you can see, there are some clocking issues. I've never worked on a turbo before. I think I can figure it out since there are only a handful of bolts, but can someone point me in the right direction on clocking the compressor housing and the cartridge? I assume that I've got to be very careful around the fan blades so I'm a bit reluctant to just go unbolting stuff.

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12

u/sam56778 2d ago

This one is fairly simple. Loosen the bolts and turn the cartridge where you need it. Then loosen the v-band and clock the aluminum snail where you need it. Sometimes it’s a good idea to leave the cartridge a little loose until you tighten the hardline for your oil drain. The hard ones are the VGTs which this one isn’t.

1

u/Knoxes 1d ago

Just following up to be clear. I'm removing the bolts into the turbine housing to rotate the cartridge, correct?

2

u/sam56778 1d ago

Yes.

1

u/Knoxes 4h ago

Done. Easy. Just wasn't sure going into it.

6

u/DesiccantPack 2d ago

Not hard. Rotate the CHRA first, and the compressor housing last.

It looks like you'll rotate the CHRA 90º, then the compressor housing another 90º.

4

u/A_man_and_his_truck 2d ago

Looks like if you loosen the vband clamp, you can rotate the housing. Just be careful not to munch the blades when you rotate. I had to on my setup too, but slightly different turbo.

1

u/DesiccantPack 2d ago

You don't just rotate the housing. The CHRA has to be clocked correctly for oiling purposes.

1

u/A_man_and_his_truck 2d ago

Yes, i also added that as another comment

1

u/A_man_and_his_truck 2d ago

And as far as the cartridge, unbolt from the hot side, pull it out, and reclock the drains.

1

u/Mister_Goldenfold 2d ago

Just unbolt or loosen then rotate