Compatible CD changer and lead and front fog light question - Page 2 - MG-Rover.org Forums
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post #21 of 24 (permalink) Old 16-03-2017, 09:20 Thread Starter
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Turbo part obsolete

Thanks to John I now have a nice new diaphragm for the recirculating dump valve. Unfortunately after speaking to several turbo specialists and suppliers, my search for a new wastegate actuator has shown that this part is now obsolete. I believe this is due to it being spot welded to it's bracket and having a relatively low rating of .4 to .5 bar, which relates to when the arm begins to move. So if you want to keep things standard and don't want to fit an adjustable aftermarket one like a Forge, your options are now limited.
One supplier has suggested if I remove the old actuator from the bracket they can supply a .3 bar rated stud fitted actuator which I can fit to the bracket, it could then have extra preload adjusted in to compensate for lower rating. At present I am going to try a decent secondhand standard actuator and see how it goes. The good news is that all the other parts for the turbo are still easily obtainable and I was quoted a price of 250+vat for a complete recon turbo of the shelf. I assume these companies must replace the actuator on a similar basis as suggested.
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post #22 of 24 (permalink) Old 16-03-2017, 21:55
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Just increase the preload - that almost always works. They loosen with age. Ideally you are after "half-a-hole" of preload. i.e. with the wastegate closed you should be half the width of the hole out on the actuator fitment - meaning you need to stretch the actuator against its spring pressure by half a hole to fit the actuator back onto the wastegate arm.
Sounds complicated but simple when you have it infront of you.
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post #23 of 24 (permalink) Old 19-03-2017, 11:56 Thread Starter
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I'm not sure if adjusting it again will work for long, I suspect the spring has probably gone soft and is allowing the gate to open at too lower pressure. Luckily I have a good used one on it's way to me courtesy of MG John, so hopefully that should sort the problem.
Once I've got the old one off I can remove it from it's bracket and get hold of a suitable .5 bar actuator to replace it, I'll then have a new replacement just in case.
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post #24 of 24 (permalink) Old 19-03-2017, 22:00
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Quote:
Originally Posted by SD1 3500 View Post
I'm not sure if adjusting it again will work for long, I suspect the spring has probably gone soft and is allowing the gate to open at too lower pressure. Luckily I have a good used one on it's way to me courtesy of MG John, so hopefully that should sort the problem.
Once I've got the old one off I can remove it from it's bracket and get hold of a suitable .5 bar actuator to replace it, I'll then have a new replacement just in case.
It almost always works in my experience. You are ideally looking to adjust it to 6-7psi boost.
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