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What have you done to your 5 ton this week?

Wreckclues

Wreckclues

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Installed one of Big Mike's engine block heaters. He advertises it as "ENGINE BLOCK HEATER FOR M809, M939, AND M939A1 MODELS w/NHC 250 CUMMINS - EBH250".
The instructions say it's for Cummins (855 CID) engine series with side plate, which I assume covers our engines. The heating element on my device points aft, probably should have installed it at th middle engine plate as the photo in the instructions suggest, but I couldn't get at it without removing more parts than I was prepared to. Regardless, it works great, temps have been in the teens and the engine is warm to the touch.

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Mack90

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SCM35A2 said:
Been collection parts & hopefully with all this my "fuel" issue will be resolved. New stainless steel pickup tubes, fuel sending unit, tank vent valve, dual filter kit w/filters & swapping out any outdated/oem rubber fuel lines...






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I am about to take on this exact project. My copper fuel lines have seperated at tank connection. I bought a flaring tool to sort it out. Do you have any tips/advice on your project? My fuel is draining back to tank causing difficult starts after sitting for a few days. Where did you get the pickup tubes?
 
Wreckclues

Wreckclues

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Installed a 24 Volt, 3-8 psi fuel pump, bypassing the PT pump, to charge the fuel rail prior to starting and diagnose what my RPM issue is. To recap she's hard starting and I can't get her over 1000 RPM.
Also addressed a bent nipple on the fuel shutoff valve that caused a misalignment of the valve with the fuel rail. Broke the old one off after attempting to bend it back. Drilled and tapped for a 1/4 inch NPT steel nipple, although now it stands taller it lines up better with the fuel rail.
Had originally planned to pull fuel from a Frankenstein's monster "T" fitting that was to complicated and didn't fit the space allowed. Instead I drilled and tapped a 6410 series Male to Female boss adapter, attached directly to the truck's filter, for a 5/16 inch fuel barb. A 6410 series straight reducer accepts the trucks original fuel line fitting.
The electric pump's fuel line attaches to a check valve, had originally planned an inline filter but removed as redundant. The pump is attached to one of the cable brackets bolted to the engine block where it's also grounded. It's powered by the fuel solenoid circuit, my rig is a fully manual stop. Had intended to use the cold start circuit, which proved to be dead, oh well, another project.
On start up the pump is powered by the ignition switch and can be turned off once the engine is running. Fuel flows to the engine through a spare fuel port on the Solenoid body. Also removed the manual solenoid shutoff screw and sealed it with a bolt and Oring.
Tests are inconclusive as now I have a dead battery in my pack and can't get more than a couple pulls on the starter. Also not sure what kind of return to expect from a 3-8 psi pump on the fuel rail. I only have a trickle.


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Mack90

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Mine is the nhc250. I ordered the belts and hoses from Eastern Surplus. I regret not taking fan off before the belt changes. I am going to pull radiator out and take it to a local place for repair. Any idea how much the radiator weighs?

SandBar said:
Ouch. Is it a multi fuel? Can you share some photos of the hoses you replaced and perhaps the part numbers you ordered?
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hgun

hgun

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Hi guys I’m curious if anyone has a clue what a T-Case out of a M818 weighs with the parking brake and fluid. I’m thinking 500ish. Can’t really pick it up and stand on bathroom scale lol. Might need to ship it. Thank you
 
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Mack90

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750ish will probably be closer
hgun said:
Hi guys I’m curious if anyone has a clue what a T-Case out of a M818 weighs with the parking brake and fluid. I’m thinking 500ish. Can’t really pick it up and stand on bathroom scale lol. Might need to ship it. Thank you
Click to expand...
 
TechnoWeenie

TechnoWeenie

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msgjd

msgjd

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Wreckclues said:
Had intended to use the cold start circuit, which proved to be dead, oh well, another project.
Click to expand...
Going way back when these trucks were new / near-new, i never felt confident the intake preheater system
amounted to anything when temps were 25F and lower.. These engines were the non-starters in very cold weather compared to everything else in the motor pool.. Seemed like the preheater just fogged up the cylinders with smoke and took something away from the firing process , let alone pull down half the battery pack...

In theory, that preheat system should work, but there isn't any meat to it compared to the cubic inches .. Besides, I've never seen that "science" on civilian 855's ... IME the faster an 855 can spin , the better / quicker it will start.. I've also had 855's with a decompression handle which was an excellent feature for two reasons, cold starts and pre-start oil pressure..

Your block heater in that 855 is the best thing of all ! Now you won't have to waste your time on the preheater :)
 
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