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Rear main seal situation. Looking for help.


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#1 Spamaho

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Posted 14 July 2017 - 03:58 PM

Hey all I have a 79 Datsun 620 with the 2.0 liter LB 4 cylinder with the automatic transmission. I am currently in the process of pulling the transmission and replacing the rear main seal. The question I have is what would happen if I didn't replace the rear main cap side seals (some people call them oil curtains if I am not mistaken)?

The reason I am asking is I don't want to take the rear main cap off and risk messing the rod bearing up. Hopefully you guys can help out.

#2 datzenmike

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Posted 14 July 2017 - 04:30 PM

They are probably fine as there are no moving parts rubbing like the crank and the seal are.

 

You're sure it's the rear seal and not the oil pan gasket?


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#3 Spamaho

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Posted 14 July 2017 - 05:04 PM

Yes the rear main seal was pushed out of the top lol. I already removed it and it had a giant tear in it. I just wanted to make to sure that those didn't need to be replaced before putting it back together

#4 datzenmike

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Posted 14 July 2017 - 06:13 PM

Make sure you grease the seal before installing it. You don't want it starting up dry.


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#5 Spamaho

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Posted 14 July 2017 - 06:16 PM

Ok thanks

#6 Draker

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Posted 15 July 2017 - 06:31 AM

Yeah the curtains are not as important.
View my 69 510 4dr Sedan - Build Thread
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#7 Doctor510

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Posted 15 July 2017 - 09:46 AM

Yes the rear main seal was pushed out of the top lol. I already removed it and it had a giant tear in it. I just wanted to make to sure that those didn't need to be replaced before putting it back together

You don't have to remove the RMS cap where the "side curtains live".  Just replace the big round seal and call it a day.



#8 Spamaho

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Posted 28 November 2017 - 11:48 AM

Update ..... I know it's been a min. I wanted to put some Milesian the truck & on the rear mail seal & just wanted to update y'all. It's not leaking and it's doing great . Thanks for the help & the quick replies.