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Keffer inc

MP8 running hot up hills and mountains

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I think I see air bubbles coming up inside me coolant tank. I replaced that and it's clear where you can see inside of it and there's bubble coming up. If I choke the hose that supplies coolant to the system, the bubbles stop, so it's not just engine vibration tricking me I don't think. Bad to the dealer ship. This truck is a shop queen this month. Hopefully it's something they did wrong when it was there for an injector 1.5 weeks ago. Probably a injector cup? It definitely got worse since I got it back from them.

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16 hours ago, Keffer inc said:

Doing my first load since I replaced the water pump, thermostat, cleaner the radiator fins, changed the coolant filter, and the truck is running 210-215 with a 20 foot container with a 1 ton load on flat ground. It seems to have gotten worse. I noticed if I'm at a traffic light, it's coolant down to 200 when we get going and climbs back to 210 in a minute or two. Think it's possible it's an EGR blockage? I'm assuming these trucks have oil coolers, but not sure where they are located? 

It may be the egr cooler  how ever it would likely be throwing an up an engine fault for mass flow! And it it don't normally cause over heating!

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If it was a failed EGR cooler, coolant should be in the outlet pipe right? Can't really go the other way can it? Meaning exhaust is going into the coolant system?

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13 hours ago, Keffer inc said:

If it was a failed EGR cooler, coolant should be in the outlet pipe right? Can't really go the other way can it? Meaning exhaust is going into the coolant system?

YUP Oh ya it can ! only 16 Psi in the rad 30 plus on the other side!

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37 minutes ago, fjh said:

YUP Oh ya it can ! only 16 Psi in the rad 30 plus on the other side!

Shouldn't coolant leak back while the truck is not running?

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Usually Yes!

In my opinion you likely got an injector cup issue how ever usually this is  accompanied by a hard starting condition! But not always ! The  same can be s said for the EGR thing 16 psi shut down may not be enough to leak coolant but 35 psi back pressure( may )be able to push back into the cooling system! unfortunately its a crap shoot! Remove the forward EGR tube and look right inside  for trace amounts of coolant red or orange dots!

Edited by fjh
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Forward tube? Would that be exhaust inlet or outlet? I checked the outlet and it was dry and black soot as usual with no sign of dried coolant. But that was only checked on outlet.

I too think it's a cup, it's just too coincidence that they just did an injector and the fact too that they said they had a hard time getting the old cup out that they needed to cut it out. Hope they didn't cut too much out that it needs a new head.

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The truck has a date with the dealer on Friday. Three weeks out of the month..  Its turning into a "shop queen". Sucks too, I wanted to quit my job and start with Mercer but can't do that if my truck isn't right and can't get a head ache rack because of all the expenses. 

If it is caused by work they did, do dealers usually warranty their work and fix it for free? Hopefully I'm not paying twice for the same part.

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Probably depends how well you can leverage your anger at them.

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