Karlos G

iTrader: (4)

I was driving along and all of a sudden I had no boost, literally only made around 3 psi at 6000rpm!
So checked all hoses etc. as you do and all was well, then popped the actuator rod off the waste gate arm to check the gate was not stuck open or something silly (sounded like turbo wasnt spooling) and I found that the preload had gone from half a hole to no hole at all and was actually holding the gate open a fraction!!!
So I wound the rod in and set half a hole again as normal but in the back of my mind was thinking maybe the penny wheel had come off because how could I go from having half a hole of preload to none (threads are fine on the actuator rod etc.)?!
Went up the road not expecting any boost and much to my suprise it's all back to normal!
What could of happened? It makes no sense to me! lol

matthart

Maybe the thread on the actuator rod is buggered and its slipping down a few notches under high boost?

Bit of a wierd one indeed!

Rogeyboy

iTrader: (2)

Or the nut wasn't done up tight and it "spun" back afew turns or as matt says!

botters

iTrader: (2)

you are tightening the locking nut up arnt you and not just leaving it loose for quick adjustment?

Stu @ M Developments

iTrader: (12)

The wastegate arm/shaft has bent/twisted mate.

Karlos G

iTrader: (4)

See above lol
Nut was done up had to crack it off to adjust it.
Oh! Is this a common problem and how does it happen, too high EGT's?
Should I replace the elbow or can I replace just the wastegate shaft?

matthart

That'll teach me for not fully reading a post

Stu @ M Developments

iTrader: (12)

Pretty common mate, just poor materials usually, depends whats moved but inspection will usually show it up. Sometimes its just a twist and once reset never happens again but just makes sure you operating angle is still inear and your not now trying to push the pin itself instead of the arm, if that even makes any sense?

What i am getting at is the operating angle will now have changed as the rest position has been altered.

Karlos G

iTrader: (4)

Yup got ya, the angle is acceptable from actuator rod to wastegate arm although it is noticably different, I guess so long as it still functions as it should and can hold stable boost that is all that matters really? Any more probs and I'll just replace it.
Thanks Stu!

Stu @ M Developments

iTrader: (12)

Your welcome.

Yes it is, just ensure the angle maintains a linear opening, as once it gets too close to 90 dgrees it becomes a little odd with regards overboost peaks etc.

Rogeyboy

iTrader: (2)

I guess this is a common issue. I had a similar thing with the actuator bracket, i had to bend mine a touch to get the actuator rod to line up nicely with the wastegate pin as it was out of line when opening and i thought it could cause it to stick... This couldve led to excess pressure on the wrong part of the wastegate arm etc?

Karlos G

iTrader: (4)

Yeah sounds like the same thing, my bracket could do with a little bend to make the actuator rod 100% straight, next time I'm under there I'll do it.

Rogeyboy

iTrader: (2)

Its quite hard 2 bend, a 3/8 extension bar works well tho...

rickbartlett

i had this problem, so i slackened off the nuts on the snail and rotated it very slightly so actuator lined up perfect then