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tbran 
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Joined: 14 Sep 2009
Location: Paris Tn
Points: 3291
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 Posted: 10 Feb 2018 at 9:02am |
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The turbo on the 7020 was a TO4B80 with a .6 A/R intake and a .58 A/R ratio on the exhaust. The 200/190 and other non intercooled versions had a .69 exhaust A/R ratio. Thu the years some power plants had the smaller exhaust housing for a bit more boost - as in some M2's we have seen and some stationary power plants that had lower rpm rated load. AND anytime one sees where the compressor wheel had contacted the scroll - you have a bad turbo..
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When told "it's not the money,it's the principle", remember, it's always the money..
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joe
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Joined: 30 Nov 2009
Location: SW Ontario
Points: 137
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Posted: 10 Feb 2018 at 11:50am |
It would seem to me that if it blowing lots of black smoke, the problem could be in the injectors or pump, but with only 10 psi boost, I would certainly be looking at the turbo first, given that it is well out of spec. The thing that bugs me about the spec that Allis provides is they don't list PSIA or PSIG. ( I looked at it in my manual, and it's just listed as PSI) Today, boost is mostly given in PSIA, which would make 10 PSIG right on the money. 24PSIG isn't way out of wack though, so I'd tend to treat that number as believable. The Dr. may have practical experience with it though. He may have actually seen a 7020 make 20+ PSI boost.
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nick121
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Joined: 13 Apr 2016
Location: ontario
Points: 322
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Posted: 10 Feb 2018 at 9:11pm |
Well I wouldn't be putting that $300 ebay turbo.. just asking for trouble in my opinion. Don't have a 7020 but run a M2 combine and F2 and 7040, While they are known for black smoke, I have never noticed excessive smoke unless under heavy load.
M2 gives off smoke but more of a haze.. A cloud when going from low idle to wide open. It has a 301 turbo charged 130 hp at the fly wheel, so not as high as your 7020. The boost gauge on the M2 will be around 15 psi when it's under load.
Maybe you have a boost leak somewhere? Restricted air filter? Injectors but that doesn't explain the low boost psi.
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LeonR2013
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Joined: 01 Jan 2013
Location: Fulton, Mo
Points: 3500
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Posted: 10 Feb 2018 at 10:07pm |
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If you had a boost leak at 10 PSI I'd think you'd have a significant whistle on the compressor side.
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DrAllis
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Joined: 12 Sep 2009
Points: 20479
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Posted: 10 Feb 2018 at 10:55pm |
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About ten replies back he said the intake gasket is leaking.
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allis g
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Joined: 10 Jan 2012
Location: Templeton
Points: 402
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Posted: 11 Feb 2018 at 8:03pm |
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Don't know if this guy can help but I know a Turbo guy in Lake Havasu City Arizona. His name is Tom Spictich (might not be spelled correctly). His company name is Turbo Research. He really knows the business.
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WD45Diesel57
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Joined: 20 Jul 2010
Location: Varna, Ont. Can
Points: 646
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Posted: 12 Feb 2018 at 7:30am |
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if the intake gasket is leaking that's the first thing I'd fix, that could explain low boost and lots of smoke.
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1-B's, 2-C, 2-CA's,2-WF, 1-WC,1-G, 3-WD's, 2-WD45, 1-RC, 1-D17 Diesel, 1-D14, 2-D15,1-D17 row crop,1-D19 gas and All Crop 40,60,66,72,90 and 100
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Blustery Knoll Farm
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Joined: 04 Dec 2017
Location: Northern IL
Points: 117
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Posted: 12 Feb 2018 at 3:41pm |
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I took the manifold off this morning. The bottom half of the gasket was crumpled up in front of the intake ports. So, there was NO gasket across the entire bottom of the manifold. So, I am surprised it had any boost pressure at all.
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DrAllis
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Posted: 12 Feb 2018 at 3:48pm |
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And, when there's a leak like that, it's kinda hard on the turbo as it is constantly over speeding due to low back pressure.
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SteveM C/IL
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 8235
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Posted: 12 Feb 2018 at 5:30pm |
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All floating bearing turbos are kinda loosey goosey when grabbing shaft. I was told you should not be able to make wheel scrape housing.If you can,it needs replaced.
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DrAllis
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Posted: 18 Feb 2018 at 9:52am |
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Been almost a week. How much boost now with a good intake gasket ??
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tbran
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Joined: 14 Sep 2009
Location: Paris Tn
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Posted: 18 Feb 2018 at 9:52pm |
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hey Doc. Several times in the past we have had issues of low hp and smoke and found the large plugs blow out of the intake manifold.. especially on combines. Ever seen this? I don't remember an intake manifold blown - but just had one do it on my old turbo'd 185 very ... rare.....
Edited by tbran - 18 Feb 2018 at 9:54pm
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When told "it's not the money,it's the principle", remember, it's always the money..
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LeonR2013
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Joined: 01 Jan 2013
Location: Fulton, Mo
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Posted: 19 Feb 2018 at 2:30am |
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Did you check the manifold for flatness? If you don't have it back on, it might be a good idea.
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MACK
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Joined: 17 Nov 2009
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Posted: 19 Feb 2018 at 7:03am |
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Intercooler manifolds blow gaskets at back quite often. MACK
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DrAllis
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Posted: 19 Feb 2018 at 7:06am |
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Yup....seen plugs that fell out before. Have replaced a few intake to cyl head gaskets on the 7050-60-80's before, but never one on a 7020.
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Blustery Knoll Farm
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Location: Northern IL
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Posted: 19 Feb 2018 at 9:51pm |
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The results are in. I've been so busy using it the last couple days, that I haven't had time to check back in here. I did take the manifold in to my local machine shop to have it planed, but the machinist checked it out and found it to be in spec. as is. I got it back together last Friday and used it for hauling some manure over the weekend. It smokes a lot less, and builds boost a lot sooner. If I load it down to 2300 RPM with the brakes at WOT, it will build boost a little over 20 PSI.
Thanks so much for your help. This sure was cheaper than having the pump and injectors rebuilt :)
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nick121
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Joined: 13 Apr 2016
Location: ontario
Points: 322
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Posted: 20 Feb 2018 at 5:39am |
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That's great! Hopefully she keeps running good for you know. Once again shows how helpful this forum is.
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