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1999 Caterpillar 3406E 2ws High EGT's

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Morgan379, Jul 14, 2024.

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Jul 14, 2024 #11

blairandgretchen Road Train Member

13,376

71,892

Dec 9, 2011

South west Missouri

0

wore out said: ↑

The 2WS didn’t have a non waste gate turbo as a factory option. So I would find what that turbo really is.

High EGT is usually caused from insufficient air flow. It’s very common for a turbo to make a lot of boost but still have a leak that is causing air loss. 40psi sealed is a far cry from 40psi with a leak. You need to find a way to close off the fresh air inlet of your turbo. Put a regulator in the intake on left side of head there will be a couple 1/4 NPT plugs remove one put your regulator set to 10 psi there and shop air. Spray everything down from your boost gauge line to the clamp that holds the compressor cover on your turbo. Also check bottom of your air drier as I have seen boost evacuate there due to the air compressor draws its filtered air from the intake. Also make sure you have no leaks from head to turbo on exhaust manifold as that causes you to loose drive pressure. If all that checks out, pull the exhaust housing of turbo and check the exducer wheel something could have fell in exhaust housing and went through it. It takes little damage there to have a big effect.

I personally would run a non gated 1.45. It’s a good middle of the road. I have however seen dyno pulls done on 14.6L E models were the only changes made between the pulls was exhaust housing from 1.32 to 1.45. The 1.32 made more boost, had a 100 degree higher exhaust temp and made a whopping 10 horsepower less than the 1.45.
None of that is significant enough to get excited about. I do prefer the 1.45 for the slightly slower spool, it saves your compressor for 1 and less boost is always better. That chuff or bark you hear when backing out of a 1.32 housing is a warning that ####s coming apart sooner or later
Click to expand...

You can take that to the bank. He’s a lot smarter than he looks, and he does owe me a few aluminum wheels, but he has the experience with your engine.

blairandgretchen, Jul 14, 2024

blairandgretchen, Jul 14, 2024

#11

Diesel Dave, Deere hunter, Oxbow and 3 others Thank this.
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