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  #1  
Old April 1st, 2007, 10:51
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rear main seal. RTV issue.

im currently doing my rear main for the first time.

i needed to unbolt the trackbar, front shocks, swaybars and grind some of the control arm mounts to finally pull the pan

both halfs of the new seals are in place and oriented correctly.

heres my question. will blue RTV work for the main bearing cap?



i got that image off of gojeep's tutorial (which i must say is amazing, along with jason's/jeepin and 5-90's)

is it absolutely critical i rtv this surface? if so will the blue rtv be sufficient?

i ahve some black silicone sealer but not "RTV", its made by permatex but apparently is not what i need. i would run to the store and pick up a tube fo the stuff but my daily driver is out of commission until this job is complete.

torque specs on the main bearing cap are 40, then 60 then 80 correct? the small sump bolts are 7ft lbs and teh large ones are 11?

any input appreciated
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  #2  
Old April 1st, 2007, 11:15
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Re: rear main seal. RTV issue.

RTV ( room tempurature Vulcanizing) rubber color does not matter as much as the properties put into the RTV, If you have permatex gasket maker it is RTV

I have used the red, blue, and black all without issue on my many different 4.0's

what does the package of the permatex say? part #? etc, you cna look it up online for the properties

http://www.permatex.com/products/aut...ket_makers.htm
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  #3  
Old April 1st, 2007, 11:17
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Re: rear main seal. RTV issue.

Quote:
Originally Posted by rockwerks
RTV ( room tempurature Vulcanizing) rubber color does not matter as much as the properties put into the RTV, If you have permatex gasket maker it is RTV

I have used the red, blue, and black all without issue on my many different 4.0's

what does the package of the permatex say? part #? etc, you cna look it up online for the properties

http://www.permatex.com/products/aut...ket_makers.htm
"sensor-safe" blue rtv. item# 80022

http://www.permatex.com/products/aut...sket_Maker.htm
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  #4  
Old April 1st, 2007, 11:23
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Re: rear main seal. RTV issue.

Quote:
Originally Posted by rag
"sensor-safe" blue rtv. item# 80022

http://www.permatex.com/products/aut...sket_Maker.htm

that will work fine, jsut make sure it has a chance to skim over before you assemble it other wise it will all squeeze out and start to leak. I put a dab on both sides and let it rest about 10 minutes
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  #5  
Old April 1st, 2007, 11:38
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Re: rear main seal. RTV issue.

I believe the color difference (at least with the RTV black) is in it's tolerance to heat. The label on the RTV black says it's for high heat applications.
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  #6  
Old April 1st, 2007, 11:53
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Re: rear main seal. RTV issue.

thanks alot. im putting everything back together finally. ill update when complete.
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  #7  
Old April 1st, 2007, 12:03
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Re: rear main seal. RTV issue.

Quote:
Originally Posted by fubar XJ
I believe the color difference (at least with the RTV black) is in it's tolerance to heat. The label on the RTV black says it's for high heat applications.
ultra black 500* highest oil resistance (best for oil pan etc)
ultra blue/blue 500* general purpose
ultra gray 500* more ridgid high torque applications
orange 650* resists all fluids, higher temp
ultra copper 700* most oil resistant, highest temp most advanced
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  #8  
Old April 1st, 2007, 14:07
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Re: rear main seal. RTV issue.

i am on my laptop, sitting in my heep. shes idling and ive been bringing her rpms smoothly up to 3k and down to idle. great oilpressure. no apparent leaks so far *knock on wood*

lemme go back to hooking all my suspension back up and ill post again once i take her for an actual drive at operating temperatures
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  #9  
Old April 1st, 2007, 14:34
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Re: rear main seal. RTV issue.

With any of the RTV's you want to give it overnight before heating it up so it can cure correctly. ohterwise you might get premature failure
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  #10  
Old April 1st, 2007, 15:35
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Re: rear main seal. RTV issue.

Quote:
Originally Posted by rockwerks
With any of the RTV's you want to give it overnight before heating it up so it can cure correctly. ohterwise you might get premature failure
note taken
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  #11  
Old April 2nd, 2007, 12:32
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Re: rear main seal. RTV issue.

so far not one drop of oil has come from the sump gasket or the rear main seal. ive clocked about 100 miles on teh truck since finishing the job. i opted for the one peice seal, yes it was some extra cash but i had no problems with it whatsoever. next im going to tackle the oil filter adaptor before it starts leaking

finally i can drive on the highway and not have oil pouring onto my exhaust right below the trans.

thanks goes out to 5-90, jason, go jeep and of course rockwerks. and who can forget naxja.org, i smell a paid membership on the way.
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  #12  
Old April 2nd, 2007, 18:43
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Re: rear main seal. RTV issue.

Quote:
i opted for the one peice seal
more info on this please.....
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  #13  
Old April 2nd, 2007, 19:03
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Re: rear main seal. RTV issue.

Quote:
Originally Posted by thall
more info on this please.....
it is the seal from the older cj style 4.2 it requires you to drop the trans mission and flex plate along with the oil pan to install. turns a fairly easy job into a major reconstruction
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  #14  
Old April 2nd, 2007, 20:17
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Re: rear main seal. RTV issue.

Quote:
Originally Posted by rockwerks
it is the seal from the older cj style 4.2 it requires you to drop the trans mission and flex plate along with the oil pan to install. turns a fairly easy job into a major reconstruction
sorry i was vague. i meant to say one peice oilpan seal. not the rear main seal. im no masochist to do a 1piece rearmain
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  #15  
Old April 2nd, 2007, 20:28
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Re: rear main seal. RTV issue.

LOL, I just picked up the one piece oil pan seal today nice rubber gasket
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