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Old 05-05-2012, 05:02 PM   #1
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Got An Oil Leak In Front Of CAT 3126

Over the past year, I have developed an oil leak somewhere in the front of the CAT 3126B engine with rear radiator It is not the oil seal as I have had it replaced. I do believe it has something to do with the oil filler plumbing or possibly a gasket in the timing gear cover. At any rate, I will need to remove the radiator and CAC to get to the front of the engine. Has anyone done this on a 2000 to 2004 Horizon or Journey? Maybe other years and models with the same rear end? I know the lower grill will need to come off but was wondering if the radiator and CAC comes out as one unit? Had an estimate from Freightliner of $2K to 3K for the work to remove plus labor on parts and repair. Since I have more time than money, thought I'd try myself. Thanks in advance.
Richard
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Old 05-06-2012, 10:05 AM   #2
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3126 oil leak

Richard,
Looking at the front of the head right side there is a 1 1/4" high pressure oil plug with a small "O" ring 90% chance it is leaking running down the front. It takes a large torks to remove the plug ( cat dealer has it). I have replaced few of them.Lot of work for a "O" ring
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Old 05-06-2012, 10:28 AM   #3
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DKY
Thanks for the reply. I will see if I can find the plug. Is it accessable from the top of the engine? I have used a flashlight from the top but did not see oil near the top half of the engine. We did have the damper and pulley pulled when front seal was replaced and it appeared as tho oil had been running down around the timing gear cover on the lower half of the front on right side. Problem is, we can't we really see the whole front without removing the radiator & CAC. Thanks again and I'll post when I find it but unit is now in NV and we won't be back till middle of June. Just trying to gather info,
Richard
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Old 05-06-2012, 12:45 PM   #4
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3126 oil leak

Richard,
If you have a mirror and flash light you see can the plug.The leaking oil runs down both sides of the front between the block and the head .The air movement from the fan moves the oil to one side or the other, hard to find leak. You can do the work from the top front.
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Old 05-06-2012, 02:51 PM   #5
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Thanks Dwight, I'll give a try. If it works, sure save me a lot of time and effort. I was going to clean between the radiator and CAC while it was out but I'm not having an overheat problem so no big deal.
Thanks again
Richard
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