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Kota · 07-28-2016, 08:16 AM

Other that the cruise control and wiring issues, how it running?

Hope things start going your way!

Vycan · 07-28-2016, 08:47 AM

Consumes/leaks 1 Gal of coolant every 100 miles, with no signs of leaking. Runs great, got 12.8 mpg with toad. Just need to figure out reason for loss of coolant. Can run all day at 2k rpm, but at 1600-1750rpm, that's when we lose coolant.

SpiceStream · 07-28-2016, 09:12 AM

What a bummer, I live in Southern Wisconsin, if you have any trouble on your way back, let me know, I can help.
We got home from a 10,000+ mile trip to Alaska in our 310 on Tuesday night.
We are contemplating a Newfoundland trip next summer, I hope you find a simple reason for your coolant leak and your trip goes better.

mayco · 07-28-2016, 09:44 AM

I wonder if the difference in rpm has an affect on engine temp and thus has an affect on the thermostat opening and closing. Then some relationship between loss of coolant and whether it is circulating or not. This from a very mechanically challeged source, me.

Kota · 07-28-2016, 10:10 AM

Quote:

Originally Posted by Vycan

Consumes/leaks 1 Gal of coolant every 100 miles, with no signs of leaking. Runs great, got 12.8 mpg with toad. Just need to figure out reason for loss of coolant. Can run all day at 2k rpm, but at 1600-1750rpm, that's when we lose coolant.

My experience has been that they really don't like pulling along at the lower rpms. 1800-2000 seems to be a happy spot on mine. I'll run 2200 2400 in 3, 4, or 5th hill climbing. It might be temperature thing. Maybe a leak in the radiator blowing straight out the back.

bobmiller1 · 07-28-2016, 12:21 PM

Am I correct that you are losing 1 gallon of coolant every 100 miles ??? My friend...they either screwed up the head gasket again or you have a cracked head or block. I would use a cylinder CO detection tool ASAP so you know for sure....obviously if you can't see a leak you know it's going somewhere...out the tailpipe in a vapor form. Regards, Bob

HowieE · 07-28-2016, 12:50 PM

I just found out I have lost a gallon of coolant in a year and am concerned of a head gasket problem in my Ford 6.0. A gallon in 100 miles is not a leak that is a hole. If you are not seeing it on the ground it has to be going out the exhaust. I would stop right now and send a certified letter, explaining the original and current problems, to the Cummings dealer that did the head with a copy to their corporate headquarters. That engine is going to be expensive to replace.

I had a friends Onan generator in the the local Cummings shop last week and they screwed that up by breaking off a wire that kept the generator from running at all. They said they had tested it before I picked it up. There was a time when one would assume Cummings could do a job right.

Some diesel owner do run water injection to improve mileage. Sounds like they gave you a free injection system

J. Morgan · 07-28-2016, 01:05 PM

It might be an internal engine leak, (and the odds say it is),,,,

But, it could also be a pinhole leak or a small leak over an exhaust system part etc. that tends to evaporate near instantly.

Gradiens super tenui glacie.

Phoenix · 07-28-2016, 03:00 PM

Vycan, oh good grief -- What a saga!

So sorry to hear of your problems on the road. I think I would be crying in my beer by now, thumbing my way back home.

Hope you get a satisfactory resolution to your engine problems, SOON!

Best wishes!

Kota · 07-28-2016, 04:58 PM

Just some thoughts. I can't imagine any head gasket leak that would allow 1 gallon in 100 miles to get into a cylinder without blowing the cooling system apart. A cracked head between the coolant and intake plenum could be a possibility but I could think you would see some pretty funky stuff coming out the pipe. I'd pressurize the cooling system and see where the water is going. The difference between 1600 rpms and 2000 might be more boost pressure at higher rpms preventing coolant at a few psi from entering the induction system.

Vycan · 07-28-2016, 06:40 PM

Kota, excellent point about boost if it was at intake plenum.

SebasSF · 07-28-2016, 10:34 PM

Some adventure! Lucky you had Cummins do the work!

Kota · 07-29-2016, 06:43 AM

Richard suggested the heater core(s). And the hot water tank heat exchanger and associated plumbing.

J. Morgan · 07-29-2016, 07:31 AM

Quote:

Originally Posted by Kota

Just some thoughts. I can't imagine any head gasket leak that would allow 1 gallon in 100 miles to get into a cylinder without blowing the cooling system apart. A cracked head between the coolant and intake plenum could be a possibility but I could think you would see some pretty funky stuff coming out the pipe. I'd pressurize the cooling system and see where the water is going. The difference between 1600 rpms and 2000 might be more boost pressure at higher rpms preventing coolant at a few psi from entering the induction system.

When this happens, cylinder gasses over pressurize the cooling system and blows gasses and coolant past the pressure relief valve in the radiator cap.

Gradiens super tenui glacie.

J. Morgan · 07-29-2016, 07:39 AM

What I would do first is to pressure test the cooling system, if this showed inconclusive results I would pressure test using dye.

If you have a compression leak this big, you will smell it in the coolant and or the exhaust.

Gradiens super tenui glacie.

Kota · 07-29-2016, 07:51 AM

Quote:

Originally Posted by J. Morgan

When this happens, cylinder gasses over pressurize the cooling system and blows gasses and coolant past the pressure relief valve in the radiator cap.

Gradiens super tenui glacie.

The overflow should be full and overflowing. Should be a wet mess back there.

Vycan · 07-30-2016, 11:57 AM

So, they dyed it, pressure tested it under load, and found cooling system is running at 17psi, causing the overflow out the radiator. Will isolate the air compressor, and determine if caused by engine. i.e. head gasket #3.

HowieE · 07-30-2016, 01:21 PM

Not sure of your comment to isolate the air compressor but if it means they are going to pressure test the system with air make sure they remove the injectors before hand. If the leak is in the engine or head and back pressure is applied the coolant will flow into the cylinders and if started will cause a hydraulic lock. That get real expensive

The significant increase in the leak rate points to the last job as the cause.

Isuzusweet · 07-30-2016, 02:42 PM

This is, or has become, an epic adventure to Newfoundland.........pg 6 and Nick hasn't even got out of the US yet.

How long do you have before you're AWOL mate?

Cheers
Tony

Kota · 07-30-2016, 07:50 PM

Quote:

Originally Posted by HowieE

Not sure of your comment to isolate the air compressor but if it means they are going to pressure test the system with air make sure they remove the injectors before hand. If the leak is in the engine or head and back pressure is applied the coolant will flow into the cylinders and if started will cause a hydraulic lock. That get real expensive

The significant increase in the leak rate points to the last job as the cause.

The Cummins has a haldex air compressor that's water cooled. It has two lines that run to the rear of the block. Possible for a failure to pump air into the cooling system.