Rear differential leaking
#16
12-08-2018, 10:21 PM
#17
12-08-2018, 10:32 PM
I can tell you've got limited experience in mechanics here. And the rest of your postings reveal this as well. The limiting factor here isn't the bolts, it's the thin stamped steel cover. Applying maximum force to the bolts on a thin stamped steel part isn't the smart thing to do here. Your bolts loosened up because the gaskets shrunk with age. The cover on these rear ends does nothing but cover a hole. That's why it's made of thin stamped steel or plastic, so please explain to all here why you'd use the maximum torque value for grade 8 bolts on this part ?
#18
12-09-2018, 04:27 AM
I finish the job yesterday, it took me almost 3 hours taking my time; those bolts required serious torque to unbolt them, even though I put DW40 for the last 2 days they were there for good... anyway with the breaking bar I did it. At the end I torque them to 40 ft/lbs I hope I didn’t over torque them, if the differential start leaking I’ll report back.
What sort of sealant did you use?
#19
12-09-2018, 05:45 AM
Grade 8 versus grade 5 is a difference in tensile strength, not the required torque value.
A person could torque either of the grades to any desired torque value.
The difficulty removing the old bolts could be due to their age and rust and 25+ years of being in place.
Ill disagree with both of you: torque wrench isn’t needed for most jobs when a person has experience. I certainly wouldn’t bother with a torque wrench on a simple differential cover. Just zip them in with a battery impact lightly and then medium power. The silicon will smoosh out a bit to tell you when you’re done.
A person could torque either of the grades to any desired torque value.
The difficulty removing the old bolts could be due to their age and rust and 25+ years of being in place.
Ill disagree with both of you: torque wrench isn’t needed for most jobs when a person has experience. I certainly wouldn’t bother with a torque wrench on a simple differential cover. Just zip them in with a battery impact lightly and then medium power. The silicon will smoosh out a bit to tell you when you’re done.
#20
12-09-2018, 09:45 AM
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#21
12-09-2018, 10:26 AM
#22
12-09-2018, 10:29 AM
#24
12-09-2018, 11:39 AM
Just your asking this question further illustrates your lack of experience. They get baked in place with age. No secret to this. Some bolts do, some bolts do not. The people doing the assembly use an air tool preset to a fixed torque value. There's really no experience involved here. You can train a monkey to do that job in 5 minutes if that's all that this person does on the line. Tighten 10 bolts, repeat. Over and over again on a hundred trucks in an 8 hour shift. Glad it's not my job. I have over 40 years experience in wrenching on everything from a lawnmower to bull dozers.
#25
12-09-2018, 11:57 AM
#26
12-09-2018, 12:29 PM
I am being civil. I don't appreciate being told I don't know what I'm talking about by someone who tells some one to tighten differential cover bolts to two different torque values based on what the grade of bolt it has.
#27
12-09-2018, 04:14 PM
Thank you, I used Permatex 81182 Gear Oil RTV Gasket Maker, 3 oz.
BTW since it lasted so long, I believe I'll go by the manual again!
#29
12-09-2018, 07:53 PM
I don't think I used the orange/red stuff at the time, I swear I picked up something suggested for the application, but all I see at the store now is the red, blue, and the non hardening stuff used on water pumps, I remember that last one, had to replace the water pump on a Caprice, first I ever heard of that stuff, but the sealer Ford used on the diff cover, it was really on there, was like some bolts were still in it.
#30
05-06-2019, 04:10 PM
