GT1749VA turbo rebuild

[gldgti]

Some advice:

> Be prepared for rusty/seized bolts attaching the exhaust housing to the CHRA. You will want some penetrant on the bolts and to leave them overnight/for a few days before you attempt to remove them.
> Some tools I would have handy for the disassembly:

• soft blow hammer
• ball pein hammer
• blowtorch/propane torch for heat
• a large, sturdy vice to clamp the exhaust housing while you work on the turbo
• assortment of open ended and ring spanners (8,9,10,11,12,13mm, depending on the turbo)
• 1/4" socket set
• old plastic tub and some degreaser or kerosene
• Camera
• Blue or red threadlocker

> Take some photo's of the turbo before you start to help you to orient the centre housing and compressor housing correctly when you re-assemble
> Use thread locker on all of the clamp bolts as it helps keep them in and also helps removal for the next rebuild in 150,000km time or whenever
> It might take some persuasion to actually remove the CHRA from the exhaust housing. Usually there is some corrosion which helps to stick it in there. You can safely, GENTLY tap on the exhaust housing cast steel to loosen the parts but you must take care not to damage any gasket sealing faces such as may be present on the oil drain flange on the CHRA.
> DONT use your ball pein hammer on the aluminium compressor housing. Take great care not to damage the compressor housing.

On reassembly:

> Take EXTREME care with the CHRA as the compressor wheel is exposed when the housing is not bolted up and can easily be damaged (bent blades!) by dropping even from an inch high onto a wooden bench, if you are lucky. So dont drop it!
> In light of the above, its a good idea to assemble the compressor housing onto the CHRA first so that you provide some protection to the compressor wheel.
> Take care when reassembling the vane mechanism to ensure it operates smoothly. Its quite tricky to reassembly it. Take note of the small locating pins.
> Dont fully torque up the clamp bolts until you are sure everything is seated correctly and that there is NO BINDING between the rotating assembly and their respective housings.

[pat_00]

Thanks a lot, that advice will come in handy