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Rebuilt Gt2530 Is Finally Back Onto Tha Rb20 :)

iz32

By iz32,
in Engines & Forced Induction

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iz32 Community Regular

iz32

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Posted

gday.

has anyone experienced a blocked oil feed line to the turbo before? or a reason why no oil is getting to the turbo? maybe something on the block side blocking the oil feed?

basically after the install i took it for an easy drive round the block. after it warmed up i brought it slowly upto 3000rpm where the turbo starts its spool and got a dry whining sound. i killed it an rolled into my drive.

and notice smoke from the exh housing but it smelt alot like burning paint from the rebuild.

NOTE: i turned the engine over 8 times at 5sec lengths without it firing before i started it for the first time and let it sit and idle for 10min after i fired it up. also has new oil and coolant.

any ideas guys???

BHDave Grand Master

BHDave

Posted
Posted

Yes, the factory line can get blocked. It only has a very small hole at one of the banjos so if the car wasn't looked after by a previous owner you may be paying the price. The factory banjos also have restrictors in them.

The easiest way to check if the turbo is getting oil is to just loosen the oil feed line at the turbo and see if oil spews out when you crank the car. Or just drop the oil return and see if oil is getting through that way.

iz32 Community Regular

iz32

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Yes, the factory line can get blocked. It only has a very small hole at one of the banjos so if the car wasn't looked after by a previous owner you may be paying the price. The factory banjos also have restrictors in them.

The easiest way to check if the turbo is getting oil is to just loosen the oil feed line at the turbo and see if oil spews out when you crank the car. Or just drop the oil return and see if oil is getting through that way.

thats what i suspected.... would there be much damage?

considering the turbo unit was dripping oil when i fitted it. hoping that theres some lube there.

and that i only let it idle for 10 min with a 2min drive shifting gears at 2300rpm but pushed it slowly upto 3000rpm once then killed then ignition..... :)

gonna pull the oil feed hose off and get a new one made up at enzed soon as they open

its gotta be the only part i didnt go over before refitting, cos..... its a braded oil feed line...?!? :)

discopotato03 Grand Master

discopotato03

Posted
Posted

I'd be removing the oil supply line from the block and cranking the thing over (don't let it start) to see if oil is getting to this point . Should not be too messy with a rag at the ready . If this works ok I'd remove the oil line itself and blow through it to see if its blocked . Look for kinks or any signs of being crushed/burnt etc . It won't hurt to drip feed some CLEAN oil into the turbos oil inlet as well . Given time the oil should drip through the bearing housing and out the drain hole underneath - I'd remove the drain pipe to be sure .

Hate to be the bearer of bad news but ball bearings don't like being spun dry or nearly mainly because of the speed these ones run at . Its impossible to say if the bearings have been damaged or not . I think I'd want to at least remove the dump pipe and spin the thing with my fingers to see if it felt rough or for excess shaft movement . If not sure remove the unit and get it assessed by a specialist .

Cheers A .

iz32 Community Regular

iz32

Posted
  • Author
Posted

good news is i did it right first time around... bad news is i have identified the sound as the original sound i heard 5 weeks ago and the reason i had the turbo rebuilt.... unfortunately its not the turbo bearings making the sound as i originally thought......... $1200 later :laugh:

anyways such is life and i have a higher spec turbo now.

maybe someone can enlighten me on some likely causes of this mysterious sound.

imagine a bandsaw in the distance, thats what it sounds like. its not too loud, the sucking of the air is maybe twice as loud. it only happens when boost is coming on and then fades away when u take your foot off the throttle and there is no performance loss. its definately coming from the left side of the engine bay.

and its definately not the sound of a failed exhaust gasket.

thanks guys.

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