Cat 3406E 6TS in a W900. Did overhead, set trim codes to 5232 and took the crimp off of the wastegate hose. Driver complains now of little lower power. Trucks runs alot smoother now. Had trim codes that I did not recognize across the board. 84?? I do not have them handy to type in. Set proper codes off of injectors...then tried the 5232 and it felt quite a bit better than the proper codes...and idle was still good. So we left them. But now he says it weaker down low. Could the wastgate be bleeding off at the wrong time or something? Could it being a non-working component for so long effect its function? What is the best way to test its function?
Thanks!
Testing and adjusting wastegate
Discussion in 'Trucks [ Eighteen Wheelers ]' started by Scrapper, Feb 22, 2012.
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the only thing i dont like about the 5232 settings is it might make one injector dump more fuel than another and take a chance of scoring a liner. and a weak injector weaker.
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I agree...it idled much smoother with the correct trims...but was a bit weaker too...boss wanted to keep the 5232's. May change them back actually. But drivers griping at the boss because of something I did isn't always fun. But have to do whats best for the truck.
Any idea on testing wastegate for proper opening time and function? -
Use a boost gauge on the intercooler. I run a line up to the cab and have a gauge set on that. I then test drive the truck and watch the flutter. Where the flutter is, that is when the gate dumps.
After you made the adjustments on the injectors, did you do an overhead? CAT engines are notorious for that very issue and that is why they always do an overheaed on them after any injector adjustments. -
The wastegate should open at 27 psi, but I've seen them as high as 31-32 psi. With a CAT turbo they're non adjustable. I can't remember the spec on them, but they do have a procedure to test if the actuator is reacting correctly. Unfortunately I loaned my service book to some one awhile ago and haven't gotten back yet to be able to tell you how to test it.
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Thats fine. I have a manual for the a,b,c model...just not e model and accert. If they are non adjustable why is the rod a turnbuckle? Is this just the part they used and is not really adjustable?
Yes I did run the overhead. I'm slowly making my way through the fleet wether they need it or not. Going to start from here and start doing them all every 150,000 or year. Whichever comes first.
Can I just use ET and graph the boost and see where it dumps?? Or are you saying using a mech gauge on the intercooler instead of the ECM?? -
If you look at the turn buckle, you will find a spot on it where it has been pinched down on the threads of the rod. Go to adjust it and you'll twist the rod in half.Scrapper Thanks this.
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Just needs a little bit grinding. Same on Volvo Holset.
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That is true, unless the turbo has been replaced. Some of the new turbos we put on are adjustable, but they are mostly fleet provided and not provided by us.
ECM is only as good as the sensors that read them. If one fails or if vRef is off due to corrosion, it will change parameters on ECM and be off. You still have to do the testing mechanical for accuracy on boost pressure.. You can match them both up and get your results that way and you will know if sensor is off, but I doubt it.
Can you connect onto the service side or master side of the ECM? If so, tell it to reset. Sometimes with the adjustments made, it is still working on operator history and will cut back the compression. CATs are particular engines, especially the 3406e ACERT... -
This is not a an accert...its a 6TS. But I understand what you are saying. I do not think I can do that as our ET is the customer edition. Where would I go to reset the ECM?? Can you do it as you can in cars and trucks by pulling all power from it and it reset...ie fuse or battery cables?
Will find an old boost gauge and try this.
V8...if I was able to make the turnbuckle adjustable would it be beneficial?? Or would it only confuse the ECM?? Say I was getting 26psi...and adjust it to not open till 28 to 30 consistantly? Or is that a bad idea?
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