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6.5T smokes

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MF294-4

09-24-2006 09:07:31




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Posted before but have more info,get better info here. Bought 94 6.5T 1 ton. Smoked excessively.Changed head w/burnt valve. Still fogged blue smoke. Dealer wants to replace eng.
Lowest cyl comp 320#. Very little blow-by. We changed timing chain,water sensors,cps,pcm,iat,glow plugs,had local tractor mechanic check injectors,Scheid checked pump Ok,fuel filter & return lines,ops switch,had gm mechanic retime.Runs great now but still smokes until warme up. Unplug water temp sens to advance timing and smoke inproves. What are we missing? We want to change injectors but gm mechanic says he has never had to change for this problem.

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MF294-4

09-24-2006 20:59:43




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 Re: 6.5T smokes in reply to MF294-4, 09-24-2006 09:07:31  
Yes we have a new water temp sensor. That is the sensor that we unplug and you can tell that it advances the timing and the smoke pretty well goes away. Remember this is only until engine warms to 195. With the sensor pluged in it will smoke more as you accelerate. When you hit about 3000rpm it will start to clear up but that is about red line with 4-5 lbs of boost.It will make14-15 lbs accelerating up a hill. After it warms up, it runs better than any diesel around. Yes we had the right side manafold off and 2 and 8 would puff intermittant smoke at an idle,without turbo ofcourse. 2 was the lowest comp cyl at 320. GM tech did adjusst the timing but that was after it warmed up. I don't think he ever saw it cold. It has L65F engine. I let my 16yr old son buy this to get his hands dirty to see if he wants to be a mechanic. Has turned out to be more than the both of us can handle. Right now all he wants to do is farm. Got to get him into something else. Thanks to all

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jdemaris

09-25-2006 16:30:59




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 Re: 6.5T smokes in reply to MF294-4, 09-24-2006 20:59:43  
It sounds like you just got some wear. I don't know how many miles it has on it, but I am wondering why it had a bad valve. That's rare for those diesels. I've got six, none with less then 150K, most over 200K, and one got to over 500K before the crank broke to pieces. That's a rarity though. Never had any valve trouble with any of my diesels - truck or tractor. Makes me wonder if it had the valve damaged by some sort of debris - that originated elsewhere. Most 6.5s are pretty whipped at the 225K mark. Not all, but most. And, the 6.5s made after 1993 are thin castings and not as strong - in many ways - as the 6.2 blocks and first 6.5s made in 93. Now, International Harvester is making the replacement 6.5s and they are thick casings again. Pretty pricey too. Your compression reading would mean more as compared to the rest -than the PSI reading. It's likely you've got some cylinders and/or pistons with some top damage - e.g. worn ring land, broken top rings, etc. It's highest wear area of the piston, and even though your engine has Keystone sytle rings - they still go eventually and still hammer out piston grooves. My point is - many diesels - with just about no top rings left -will run fine when hot - but will smoke until they are really warm. I ran an Allis Chalmers dozer all one summer with no top rings at all. Needed ether to start it - even in hot weather - but it ran pretty good.

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Joe-Bob/IN

09-25-2006 18:17:27




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 Re: 6.5T smokes in reply to jdemaris, 09-25-2006 16:30:59  
Who told you IH is making the replacement 6.5L's? Last I knew AM General was making the current 6.5L's.



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jdemaris

09-26-2006 07:29:30




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 6.2-6.5 Navistar or IH? in reply to Joe-Bob/IN, 09-25-2006 18:17:27  
It's not an issue of "who told me", the engines from IH are commonly available many places. I haven't shopped around much, but it seems the common retail price is $6000 for a International - blocked 6.5 diesel long-block, and $10,000 for a complete drop-in engine.
As to the name of the comany - be it International, Navistar, etc. - technically - at the moment - I believe the company is INTERNATIONAL TRUCK AND ENGINE CORPORATION. IH has played so many games with names, I've lost track. In 86, IH was almost bankrupt - so as a marketing scheme, they created the new name of NAVISTAR. At that time, a company spokesman stated that the name was computer-generated and showed the company was "navigating to the stars, to a rosy future." Jeez - sounds like they were all stoned on something. Kind of reminds me when Datsun mulled over the idea of using the name Nissan in the U.S. and named their new sports car the "My Fair Lady" - which did not go over very well. So, the "Fair Lady" was quickly changed to "240Z" which was much more appealing to people in the U.S. Anway - back to I.H. From what I've seen and read - they went from INTERNATIONAL HARVESTER COMPANY to NAVISTAR in 86. In 87 called themselves NAVISTAR INTERNATIONAL CORPORATION. In 2000 - NAVISTAR INTERNATIONAL TRANSPORTATION CORP. And now? The company making the 6.5 blocks and the engines for Ford, et. al is INTERNATIONAL TRUCK AND ENGINE CORPORATION. About the 6.2s and 6.5s - I don't know all the facts and figures - and I'm not sure anyone does. But - generally speaking - the original engine was designed from the ground-up by Detroit Diesel Corp. The first model year of use - in 1982 - the blocks were thick castings and high nickel content. In 83, the blocks remained thick but the high-nickel content was dropped except for some military orders. In 93 - the bore was increased slightly and the 6.2 became a 6.5 - still with a thick block. In 94 - the 6.5 block got cheapened - by making lighter and thinner. After that there were cracking issues. 6.2s and 6.5s sometimes - usually with high miles - blow apart - with the end result being a broken crank and broken main-bearing webs in the block. I've heard many arguments about which happens first and why (crank or block). Some claim it's fatigue due to a worn harmonic balancer. When my crank broke at 500K - my balancer was fine. I will assume the issues are due to metal fatique, and subsequently, a higher-nickel block is probably less apt to break. The new blocks being cast by International are thick casting and high-nickel. Sounds good, but the price tag ?? I've met a few people with blown 6.5s, that installed a replacement 6.2 and were very happy with it. A NA 6.2 has a higher compression ratio than a turbo 6.5 - so boost should not exceed 10 PSI if using a 6.2. But other than that -they seem to work fine. A person could easily find a less than 100K 6.2 engine for a couple of hundred dollars and it's a bolt-in replacement for many 6.5s. Except off course, if you got all the computer garbage to deal with.

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Bob

09-25-2006 21:14:31




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 Re: 6.5T smokes in reply to Joe-Bob/IN, 09-25-2006 18:17:27  
Fact.

AM General doesn't have a foundry, and "farms" the casting of the blocks out to Navistar, who casts their "Navistar Diamond" trademark into the block castings they make.

You really want to stir the Cummins boys up, remind them their vaunted 5.9 is a joint effort between Case and Cummins, called Consolidated Diesel!



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Charles McNelly III

09-24-2006 19:30:28




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 Re: 6.5T smokes in reply to MF294-4, 09-24-2006 09:07:31  
I drove a 95 Chevy 1 ton at work with the 6.5 that did the same thing. They had found a faulty turbo actuator. That"s the thing that pulls on the arm connected to the turbo. There is a vacuum line connected to it that goes to some sort of electric sensor and then it goes to the vacuum pump. When it smokes really bad, do you have any boost? Good luck
Charles



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Ray McBroom

09-24-2006 12:06:28




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 Re: 6.5T smokes in reply to MF294-4, 09-24-2006 09:07:31  
Had same problem smoking with my 6.5 found vac line to tubro leaking and senser from vac pump sticking sprayed with WD 40 eng went back working normal.



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jdemaris

09-24-2006 11:10:10




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 Re: 6.5T smokes in reply to MF294-4, 09-24-2006 09:07:31  
I haven't seen all the info on your truck. First question, is it a VIN code S? If so, GM's got the fuel turned up pretty heavy on that optional version of the 6.5. I think it was only legal over a certain GVRW class. Take a heavy fueled engine to start with, and add a few variables like late injection and weak firing-pressure in a cylinder or two, and you're bound to see smoke - especially when cold. I'm wondering if you had both heads and/or exhaust manifolds off? I'd be nice to see the exhaust ports - and see if any one port is dirtier than the rest. We had smoking problems with tractors - especially when cold and sometimes warm/no-load. It was nice to be able to pull the exhaust manifold, run it, and watch where the smoke was coming from. In your case - I assume - you don't know if the smoke is generalized and coming evenly from all the exhaust ports - or perhaps centralized from one cylinder. Knowing that would make a big difference. I will say, every time I hear of problems - that are compounded by the convoluted system Stanadyne/GM starting using in civilian diesel vehicles around 94 - I'm real glad to have all mechanical systems on mine. When GM gave up on the 6.5 and changed over to the Isuzu V8 diesel, it made a statement claiming that 6.5's electronically-controlled injection system was not cost-effective in trying to meet the ever-more restrictive emmissions regs. I also suppose it wasn't cost-effective because of the law-suits against them for the early 1994-1997 electronics failures. I'm not being a wise-guy - in fact, I'm a lifelong Chevy fan. It seems GM (or Stanadyne) did a pretty good job in later years correcting most of the problems that trucks like your's had - and I suspect by this time, your's has all the updates. In regard to changing your injectors - I cannot believe it will make any differece. It would be interesting to jack up your timing advance at cold start and see if you get an instant improvement. But, even if you do - sometimes doing such is sort of a "band-aid" for other wear problems.

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Bob

09-24-2006 09:39:04




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 Re: 6.5T smokes in reply to MF294-4, 09-24-2006 09:07:31  
You don't mention at what speed or load it smokes... do you mean nasty stinky smoke at idle, or belching smoke while accelerating, or smoking at cruise?


Have you checked the resistance vs. temperature of the sensor, or tried replacing it?

The GM guy, with his Tech I or Tech II scan tool can play with the TDC offset number, which will affect the timing. Did he try that?



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matt nelson

09-24-2006 09:28:57




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 Re: 6.5T smokes in reply to MF294-4, 09-24-2006 09:07:31  
well here is the only thing i can say, i had a 94 chevy 1 ton 6.5L stndrd cab long bed, real nice truck. And it did put out alot of smoke, but it was black smoke, and like any 18 year old kid i liked the smoke, so i left it be. but then i took the truck and had it straight piped 4 inch all the way back, and i also removed the turbo silencer ring, and now the truck doesnt smoke at all, unless you put it dead on the floor it will huff a little just like any diesel though. i also still got like 18mpg smoking or not. My boss has the same problem as you though, his 96 smokes bad!!! real bad. but he gave up and drives it every day. is the smoke black or gray or what when u poor the coals to it? 6.5 is not a bad motor, after they went to the electronic injector pump they had alot of problems that they never really did work out. With mine i had problems with the pmd (pump mounted driver)if you have not looked into that than i would because if it hasnt caused u problems yet it will, i would recommend u buy a new one and relocate it frome the side of your pump to a plae that stays cooler, via excessive heat screws them up. like fire wall will work just fine. On the other hand, smoking, its a 6.5 thing. u could just let er smoke. i actually had "chain smoker" across my tailgate. hope i could help.-matt

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