Hey guys, about to take out my exhaust manifold and change out the stock o2 housing. From everyone that did this same project they said the easiest way would be to take off the hot side of the turbo. When putting it back together does it have to be "Clocked?" I'm not even sure what that means lol! Thanks guys

-Don

 

If you have time, I would just pull the whole turbo - makes it a lot easier.

 

Is there a "how to" for that? lol

 

"Clocking" just means rotating the compressor housing so that the outlet is pointing in the direction you want. Our stock turbos have a little pin on the center section and a hole in the turbine housing to line up. No need to worry. Here's some pictures from a dsm 16g. It's the same idea;

 

My mechanic was able to do mine without removing the manifold Just need the right tool for each job

 

So do we have to clock the turbo when re-installing the hot-side?

 

I believe they are saying you don't since the Evo turbos have a pin that "forces" them to line up correctly. I honestly haven't heard of clocking a turbo since I was dealing with SR20's.

 

so I guess not then I will install the hot side as is!! If anything breaks I'm holding you all responsible!! ha ha

 

If you remove the hot side you will have to "clock" the turbo. I havent removed a stock evo turbo yet, but plenty of garrets and so forth. The turbo is Basically made up of three parts. The CHRA (center housing rotating assembly), the Turbine housing (hotside) and the compressor housing ( aluminum housing that your intake attaches to). If you slide off the hotside to attach the o2 housing youll need to reattach the hotside in a manner that everything else bolts back up correctly, ie manifold, intake, downpipe etc.

Its not rocket science. Make a mark with a sharpe that lines the hotside with the CHRA. Remove, reattach, line up sharpe mark and tighten clamp. Or just pay attention to the pin on the turbo

 

like stated earlier there is a dimple that only goes one way. no clocking necessary. IF its not lined up correctly you cant get the clamp back on.

 

The locator pin can be seen in this photo. It's at the top of the machined surface, about 11:00 o'clock. This pins "Locates the hotside to the center section. I tested several 'clocking' settings, mostly to give better clearance in the 'Compressor Outlet to Starter' area. Even the slightest 'clocking' will cause the oil drain to pan line not to match up, closer than expected clearances to the radiator fan and the oil drain from block to turbo not to match up. I did finally settle on very slight clocking which helped slightly on the Compressor outlet pipe to starter clearance. Hope that helps. It's easier to leave it as it is however.

 

In this picture, you can see the "Locating hole" in the center section. You can see it about 2:30 or 3:00 O'clock. Also, if you look closely, you can see the "locator" pin on the Hotside. It's about 7 or 8 O'clock.

 

Cool thanks for the pics, So when re-installing the hot side I just slap it on making sure I put it in the same location and I don't have to clock it?

 

When you reinstall the hotside just make sure the pin lines up with the hole.

 

thanks guys, im gonna install soon. If you guys have any other tip let me know, thanks again

-Don