Onyx610
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Everything posted by Onyx610
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That crankcase spinner assembly has also been known to cause crankcase pressure issues…
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Probably nothing going on with the cups and if you have done them a few times then you are probably good. So number one is still in the red? It’s safe to say you have another issue going on and it’s causing a lot of pressure in the crankcase. Hows truck running?
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Haha, yea when one thing goes wrong on these you get quite the riddle of codes. The only explanation I have for high crankcase pressure would be worn rings. Also like I said earlier I find it odd that it has cylinder 6 as bad but it’s at 80 percent. So is cylinder 4 but it gets the ok? Sounds like to me something wasn’t done right and he needs to go back over the work. Which sucks but it happens….Hopefully some of the other guys can maybe give him some other options first.
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Yea cups can bleed out compression. That was there main issue, not sealing. Also maybe rings/head gasket. I highly doubt it’s anything like that being it’s companion cylinders and just so happens to be the two that had work done.
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178 rpm of when he was cranking it, it shuts off the injectors for a no start. The ECM determines the results based off the cam sensor to tell what cylinder it’s on and then the sensor at the flywheel to measure the speed of the crank. Faster speed for less compression and lower speed for higher compression.
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The reason I asked did you happen to do the test before you did the work was to see if the results were the same or not. Might have another issue other then just the cups.
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Interesting this is 3 weeks after…
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Weird how cylinder 6 is in the red but at 80% just like number 4. I’m not sure how accurate this test is? I think the results are based off of the speed of the crank and uses the camshaft to tell what cylinder it’s on. Being that those two cylinders you did work on I’d say you may have to go over your work. Do the overhead again to start and see what happens.
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FJH did you look at the dates of this post?? 🤣
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Hahaha yea really, hauling black top all day long gets old quick. On site work would be much better! Sounds like real solid pulling machine you had there…
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Yea this is essentially what it’s for or being off road. Also might have its place under a milling machine at times. Instead of slipping the clutch.
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Correct, although you will find that as you go through the gears you will be at a crawl.
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So I don’t know anything about these systems. From looking around it looks like your unloader valve/governor is built into one and looks something like this picture. Might be a little different.
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Actually this would be better. https://www.raneystruckparts.com/mack-vision-cx-rockguard/?gclid=EAIaIQobChMIyKTS3paF9gIVBbSzCh1mtAUCEAQYASABEgIa_PD_BwE
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https://www.iowa80.com/vehicle/mack/mack-ch-black-mesh-bugscreen-121900?gclid=EAIaIQobChMIk9_Rm5WF9gIV-QOzAB1ZjwDwEAQYASABEgKhzfD_BwE
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put some handles on the top so you can pull it up and knock the shit off and slide it back down when you need to.
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Correct me if I’m wrong, but wouldn’t this butterfly style exhaust brake possibly create enough back pressure to open the exhaust valve without a heavier valve spring? I guess that’s why you said there was a spring update….Also with this style is it also possible that it creates a strain on the shaft? Being your essentially creating a “compressor surge” on the turbine side? When the valve closes the exhaust gas flows back fighting against an already very fast spinning shaft in the other direction? End result in time possibly being a broken shaft especially with improper shutdown?
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No there not, you need the one that’s designed for your air dryer.
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I believe it depends on if it’s the new style conical cups/injectors or not.
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https://static.nhtsa.gov/odi/tsbs/2013/SB-10082932-6903.pdf
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There is a drilling fixture for this since it’s so important like Joey said. https://www.bigmacktrucks.com/applications/core/interface/file/attachment.php?id=127406&key=e2c59db5a11bfd0e1983c492d8551f62
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Can you post some pics? When you say it’s “pushing air hard” do you mean it’s leaking a lot of air somewhere? If it is then don’t worry about the unloader valves. I don’t know about these midliners, but I’m pretty sure it will have an air governor.
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That’s a lot of engine for a 10 wheeler haha.
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Possible someone put the Eaton in and it didn’t come factory?
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