I've got a 94 chevy 6.5 I rescued and am just trying to get it running good before I start trying to do any mods. It started making this noise and I don't know where to go to find and fix it. Thanks in advance.

 

Appears to have some blowby. Sounds like its missing on one cylinder. Try breaking loose one injector at a time til the noise quiets down. Is there any pressure in the cooling system? They are known for cracked heads. I've seen many fill the cylinder with coolant and bend push rods. Figure out which side it is and time to pull valve cover. Does it get worse with RPMs? If your luck is anything like mine it's going to be the turbo side. Are all the glow plugs tight? Just a thought.


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I'll have to check the GP's as I did just change them. Being new to diesel I treated them like spark plugs and changed all but one which I couldn't find, so a loose one is possible. It does get worse with RPMs. Changing injectors was the next thing on my list when it started making this noise. And it does seem to be worse on the turbo side. Just changed the T-Stat and did a coolant flush but haven't checked to see what kind of pressure I'm getting.

 

If you loosen the injection line at each injector one at a time with engine running fuel will spray, not terribly bad, and it kills that cylinder similar to pulling plug wire off gas engine. Listen for the noise to go away or get less. You will see and hear the difference if that cylinder is firing like it should. After you verify that cylinder is working tighten line back down and then move to the next. Repeat until you find the cylinder that has no change when loosening fuel line. That's your dead or weak cylinder. Could also do this with a heat gun pointed at each exhaust runner but cutting fuel to cylinder is the best method. Only takes a 3/4" wrench and about 15 minutes to do all. Good luck and let me know if you find one not firing or no change.


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If you loosen the injection line at each injector one at a time with engine running fuel will spray, not terribly bad, and it kills that cylinder similar to pulling plug wire off gas engine. Listen for the noise to go away or get less. You will see and hear the difference if that cylinder is firing like it should. After you verify that cylinder is working tighten line back down and then move to the next. Repeat until you find the cylinder that has no change when loosening fuel line. That's your dead or weak cylinder. Could also do this with a heat gun pointed at each exhaust runner but cutting fuel to cylinder is the best method. Only takes a 3/4" wrench and about 15 minutes to do all. Good luck and let me know if you find one not firing or no change.


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I got down the drivers side and 1 at the front of the passenger side but the rest are under a heat shield behind the turbo which was quite warm by the time I got to it. Do I need to remove the blower to get in there or is there another way?

 

Take off plastic cover between frame and inner finder and you can get to them.

 

I always break lines loose then barely tighten them while the engine is cold and not running. Then after starting it, it's a lot easier to break loose and cut the fuel to that cylinder. You should be able to get to them without going thru wheel well opening.


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I tried going through the wheel well as I could see no other way to reach them from above and I can't even see them for the steel heat shield. From on top I could reach one if I had a long and skinny wrench but not the other. I can see no other way but to remove the blower. What considerations should I make before beginning this?

 

Can't you take that heat shield off? I swear I had no prob getting to injectors on my engine. Can't think of anything I had to remove to do so. Buddy of mine has a 97 dually that I'm going to go look at here shortly to jog my memory on what I'm missing. I'll take some pics and hopefully be a little more help to you. Maybe I'm just not remembering something right. But I swear I could break the lines loose fairly easy. I remember I had a couple jumper return hoses that were leaking and I had to pull a couple off and cut them down and they were on the passenger side. And I did that in a Home Depot parking lot. I'll get back to you.


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Ok I got to see what your dealing with. You are better off removing that heat shield. I didn't have one of them on my 6.5. I would take that off and you don't really need it but if the bolts somehow don't break off you could put it back on. Getting to it from underneath looks like it would be a pain if even possible.


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Ok, I'll try again tomorrow. I found the 2 itty bitty bolts on top of the shield but ran out of time looking for where else it's attached. It won't be going back on.