Project 240SX : And the hits just keep on coming…… CT26 turbo failure

I’ve begun to tear into the 2jz and start cleaning, prepping and stripping for the swap into my s14. It’s been slow going for Project 240SX, but I’ve had more than enough on my plate lately.

The saga of the 2JZ just refuses to die down, because after inspecting the CT26 turbos, I’ve been setback yet again.

Using a turbo bench, it appears as though the CT26 will not build more boost than 4 psi.

This CT26 from a 7MGTE was a cheap starter turbo to get my swap in and running before cams and headswap and a bigger single.

At a the cheap price I had found it at ( thanks to Frank @ TTA ) it was a no brainer but now it won’t build any boost which makes it about as useful as a doorjam.

Troubleshooting a CT26 Turbo

Recommended tools : Air compressor, 14mm open wrench, 8mm socket

First we check the shaft play of the turbo, which seems to be fine. There are no excessive oil leaks or signs of blown seals on our CT26, and the CHRA seems to be in decent shape all things considered.

The turbo spins freely and nothing looks like it’s hitting one another, so we turn to the wastegate.

Using a air hose nozzle to gently blow into the internal wastegate inlet, the arm of the internal wastegate appears to be moving.

That means either the flapper is done or the arm may be bent out of shape, holding the flapper open.

Removing the 4 14mm nuts that hold the 02 housing to the exhaust housing. This will allow access to the internal wastegate flapper and troubleshooting the lack of turbo pressure.

Upon opening the unit back up we find that the internal passage that leads to the flapper have completely cracked open. Since the flapper can no longer close the opening sufficiently to build boost due to the stress and cracking, it means that I’ll need a new housing.

This brings me to a crossroads because if this turbo cost anymore than it already did ( nothing ) I had to decide whether or not the investment would be worth it in the CT26.

Next up : Looking at possible turbo replacements

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  1. […] : Clocking a Turbo Posted on September 12, 2012 by stockspyder After my diagnosis on the CT26 turbocharger, I’ve determined that the best path would be to service and sell the turbo, rather than put […]

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