Ronmar
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Pull your bottom cover on the bellhousing and check the TC mount bolts…
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FMTV 3126 Engine options
- Thread starter MatthewWBailey
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I had that off for the cooler lines. Just tighten them? This is the TM diagram. Says 22ft lbs
Wingnut13
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I’ve got a 3126 and the same ballpark too. With 13k miles on the clock I swapped my oil pump(used school bus take out). And just for fun I’m running 10W30 as spec’d and it’s ok. 40psi at speed when warm but will flash the low oil pressure light at idle. I will switch back to 15w40 soon and I’ll check my oil cooler plate too.
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Ronmar
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Yep, thats the procedure to access and check/tighten them
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The Army only allows OEA (Oil, Engine Arctic) in -15F to -50F operation. For all other environments the Army uses 15w40.
As for what OEA actually is - depends on when you ask. Right now it's something synthetic that is thinner...... that's all I know. Probably a 10w30 or a 0w30 synthetic. It didn't used to be synthetic. It's been changed over the years.
I would not run 10w30 in these engines. Honestly I don't run that dishwater in anything I own except maybe the lawnmower (but likely that's just SAE 30 since cold operation isn't a concern). All my civilian vehicle engines get Amsoil 5w40. I prefer the larger viscosity spread for all-year operation and I have literally millions of miles on the Amsoil 5w40 - we run it in 95% of the oil changes we perform at my shop. Everything up to about ~400 wheel HP on a 4 cylinder. Above that we run 5w50. Where we make the call to switch to 50 depends on engine size and output...... Not a single lubrication related failure to be seen that wasn't the operators fault for running it dry.
That said - you have a 3126b with a flashing low oil pressure light..... GO DIRECTLY TO ->CHANGE YOUR PUMP. Do not pass go. Do not collect $200.
My C7 in my A1R runs Amsoil Signature 15w40. I don't foresee having any lubrication related problems. Also changed my oil pump - no change in pressure (~22 psi hot idle before and after) - just a huge change in piece of mind now that I know what's in there.
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This is the $2.89 version from Ace Hardware... 1-1/4" standard pipe thread. I know this looks redneck but will I get demoted?..
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.This is the $2.89 version from Ace Hardware... 1-1/4" standard pipe thread. I know this looks redneck but will I get demoted?..
View attachment 927273
Looks good enough to me!
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Ronmar
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Plugged is plugged… Paint it yellow, yoool be fiiine…
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Skyhawk13205
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5w-40 is a good range, looks like from -30 to 122F, cat has a good chart for the temps to run. I end up running 15w-40 in my 3126. I wonder if the HUEI system puts more stain on the oil pump? My oil pressure seems to be around 20-30 at temp at idle, and about 60-70 in cruise. I have the 6pz just waiting for the day when my oil pump starts to die.
This is the $2.89 version from Ace Hardware... 1-1/4" standard pipe thread. I know this looks redneck but will I get demoted?..
View attachment 927273
If you want, I can whip up a $347 CAT sticker for you to apply if that'd ease your wallet of its excess bulk and make the part fit in more easily?
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The cat spraypaint is $22 per can. I can't stay ahead!