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Old 12-09-2020, 12:05 PM   #1
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3126e oil leak

I have had the IAP sensor come loose and blow out the o ring seal twice now. Does any one know the torque setting for this sensor? Are there solutions others have come up with for this issue?
The bright side is I won`t need to have the toad underside oil sprayed this season.lol.
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Old 12-09-2020, 03:18 PM   #2
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I had the " O " ring , blow out of the 45 degree elbow , at the back of the HEUI pump ( 3 times in two years ) that fitting and O ring are under the same pressure as the sensor .

I was using generic high pressure/temp " O " rings , the cure was to purchase the O ring and a new fitting from Cat , O ring cost 5X as much , but 4 years later no leaks.
If you've been using Cat O rings as the replacement , I'd say maybe time for the sensor to be replaced.

I have a LARGE pdf on the 3126E , I'll flip through looking for a torque spec.

EDIT: Found the spec in time to add it here .

10 +- 2 nm. / 90 +- 18 inch lbs.
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Old 12-10-2020, 08:37 AM   #3
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Thanks Skip. Would that torque translate into about 40 ft lbs?
The sensor is only two years old. The same mechanic installed the last two o-rings. Maybe he never torqued it properly. This time I will do it myself.
Considering using a threadlockroduct. Comments?
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Old 12-10-2020, 09:53 AM   #4
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No ; inch lbs, divide by 12 for foot lbs.
You have to use an inch pound torque wrench , foot pound torque wrench won't go that low ; Approx 9 ftlbs.
Over torque probably damaging the O ring. Once the O ring splits the sensor will appear to be loose.
Over torque could also have damaged the sensor threads .

I can screen shot the page if need be , but a Cat shop should have access to the #.
PDF is 18,000kb so I can't post it, and my computer skills I can't pull just the spec.
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Old 12-13-2020, 06:49 PM   #5
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The sensor tightens until the metal shoulder of the sensor is tight against the surface its screwing into. The oring is sitting in a grove made to properly squeeze the oring too small a oring it will leak to large a oring it will not seat properly and come loose or crush the the oring. Its critical to get the correct oring. Not only is the size of the oring critical but the material the oring is made of is also critical. Some material is high temperature resistant, some is for low pressure, some is for high pressure. Get the correct oring. The sensor is just a firm snug tightness. Safe Travels
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Old 12-13-2020, 06:57 PM   #6
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From the pdf .
Attached Thumbnails
Click image for larger version

Name:	Sensor torque.JPG
Views:	13
Size:	185.1 KB
ID:	311260  
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Old 12-13-2020, 07:38 PM   #7
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Talking

Quote:
Originally Posted by Skip426 View Post
From the pdf .
Snug/Firm= 7.5 ftlbs = 90inch pounds
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Old 04-08-2021, 06:30 AM   #8
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Follow up! You nailed it Skip. I replaced the o ring with a "known" Cat oring and

tightened the sensor properly. After 500 miles RECHECKED the torque NO LEAK!!
I believe the shop that replaced the sensor did not use the proper part or used after market.
Bob
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