300tdi turbo

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cragmaz

New Member
Posts
63
Location
Leeds/Bradford Border
Hi All,

Been workin on my disco today, on the exhaust side of the engine and as well as many other things, i took the pipes off the turbo, thought i would check for play inside while i could get to it, and wobbled the end of the turbine shaft, and guess what, its got play in it!:(, reckon about a mil or so.

Car dunt smoke or owt, and drives fine, with good boost (on ma guage)

So i am wondering how much longer it will last, and what will the tell tale signs be as it gets worse?
Also, it looks fairly easy to change, is that right??
Oh and lastly, can i upgrade to a diff turbo for better performance?

Thanks all

craig
 
Turbos mostly all have play in the spindle side-to-side. They run in oil-film bearings due to the speed they turn at and the reduced friction it gives. This is why you should never 'blip' the throttle on a turbo engine then turn it off - it spins up the turbo and then starves it of oil, result = knackered turbo. SOme high performance engines even have timers that keep the engine idling until the turbo has slowed and cooled before stopping.

Excess oil in the output pipes is a sign of wear but again most turbos let by some oil film which builds up over time. If its not smoking then its usually fine. Dont spin the shaft too much either for the above reasons. If the play gets too bad the impellor can touch the housing and then its generally bye bye time, but not always as when its running the bearing oil film will maintain the rotor in position, only as long as it remains balanced.

I replaced my turbo with a 2nd hand one off ebay as the one fitted when i bought the disco had no blades at all on the fan and it STILL run silently, it just gave zero boost:(

t2.jpg


I wouldnt bother trying to repair, just replace it when it goes, it took me three hours, including coffees etc;)
 
Last edited:
davek0974 said:
Turbos mostly all have play in the spindle side-to-side. They run in oil-film bearings due to the speed they turn at and the reduced friction it gives. This is why you should never 'blip' the throttle on a turbo engine then turn it off - it spins up the turbo and then starves it of oil, result = knackered turbo. SOme high performance engines even have timers that keep the engine idling until the turbo has slowed and cooled before stopping.

Excess oil in the output pipes is a sign of wear but again most turbos let by some oil film which builds up over time. If its not smoking then its usually fine. Dont spin the shaft too much either for the above reasons. If the play gets too bad the impellor can touch the housing and then its generally bye bye time, but not always as when its running the bearing oil film will maintain the rotor in position, only as long as it remains balanced.

I replaced my turbo with a 2nd hand one off ebay as the one fitted when i bought the disco had no blades at all on the fan and it STILL run silently, it just gave zero boost:(

t2.jpg


I wouldnt bother trying to repair, just replace it when it goes, it took me three hours, including coffees etc;)
Click to expand...


It has a dawes device boost controller on it too, and it holds 18psi steady as a rock, performs fine, its just finding that play in the shaft **** me up a bit!:eek:
Had lots of turbo cars (high performance) in the past and was under the impression the shaft should have NO play in it, thats why i was worried.

Thanks for the advice

Craig
 
A tight or firm bearing would self destruct at 150,000 rpm, the oil bearing has no physical contact just oil.

Dont know what engine you have but std boost is 12psi on a 300tdi, 20 seems to be the abs. maximum. I set mine at 12 for safety and peace of mind.

BTW, the shaft should have little to almost no play in it end-to-end.
 
cragmaz said:
its a 300tdi, std boost pressure is and was 16psi, std engine will take 1.5bar (21.75psi), apparantly (!?!?)
Click to expand...

Err, RAVE quotes setting the wastegate to open at 57 - 62 cm Hg which equals 11.012 - 11.988psi which is why i set mine to 12 psi.

Obviously it wont give the max boost setting in the manual.

My boost gauge shows it limiting boost to 11.8 psi and i'm happy with that.

Dave
 
davek0974 said:
Err, RAVE quotes setting the wastegate to open at 57 - 62 cm Hg which equals 11.012 - 11.988psi which is why i set mine to 12 psi.

Obviously it wont give the max boost setting in the manual.

My boost gauge shows it limiting boost to 11.8 psi and i'm happy with that.

Dave
Click to expand...

Ok been on a long run today, and its been spot on with plenty of power and not too much black smoke:D
pulls really good, boosts and holds 20psi under full load and im happy with that!
feels pretty quick to be honest with 60/70mph comin up quite quickly;)

cheers
craig
 
Hello,

I was thinking of increasing the boost pressure. Its a bit over 1Bar now.

Will a manual boost controller valve help any or do I have to do something else to increase boost pressure ?

I'm a bit confused as to how to actually increase the booste pressure. I have done the fuel mods.
 
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