by BUBsthemu » Fri Oct 25, 2019 10:08 am
Hi guys just read this thread and thought I'd add my comments and my fix. Turbo noise is normal but of course an overly loud whine suggested something ain't right. I have a 4jg2 MU with 260000 ks and as has been mentioned before here it does breath heavily through the engine breather. This sadly is normal for these engines particularly high mileage ones. On investigation I found that my turbo appears ok with no play in the bushes, but the inlet blades were covered in oil from the engine breather. This can cause the turbo to come out of balance and the oil also slightly changes the shape of the turbo blades and all this leads to excessive noise. So while I had the inlet piping off I cleaned all piping, both low pressure and high pressure out with some Brakleen. Make sure that no Brakleen residue is left in the pipes as the engine might like it as fuel and run away, not a good look. At the same time I cleaned all the oil from the turbo blades and the inside of the housing. This can be done by starting the engine with the low and high pressure pipes off and spraying the Brakleen in through the inlet side of the spinning turbo. You will need to loosly place a rag over the outlet of the turbo because all that oil contaminated Brakleen is going to spray out. Keep running the engine like this at idle for about ten minutes. This will ensure that no Brakleen is left in the turbo for the reasons I mentioned earlier. Don't go poking anything into the spinning turbo, obvious I guess but as a mechanic I've seen people do it. Reassemble all your inlet piping and hopefully your turbo should be quieter, mine definatley is. This won't stop your engine breather from coating everything in oil again over time. Check other posts in this forum for that fix. I hope this helps, it did for me. My BUBs no longer whines when asked to work!!