All Small Six Rear main seal - Tips and Tricks

This relates to all small sixes

shreqshack

Active member
I pulled the transmission out of my 65 mustang (inline 6) this weekend (I am so proud of myself) to replace the clutch and found oil and sludge inside the bellhousing. I am thinking the rear main seal may need to be replaced? Unless finding oil and sludge in the BH is normal? Thoughts?

Is there any advantage to replacing the rear main seal with the transmission and flywheel off? It sounds like I will need to pull the oil pan too.

If you have any tips for changing out the rear main seal....i would be forever grateful. I am a little anxious about doing it.

Thanks to everyone....you have all been so helpful!! :)
 

wakjob

Well-known member
Supporter 2020
Yep...just did mine for the first time a few weeks ago...
Oil pan comes off...along with the rear main bearing cap.

If yours has the old style rope seal still in it...have fun.
That "sneaky Pete" tool is just about worthless...4 hours and bloody knuckles, and I was done with it.

You know that thing you pull up on in your bathroom sink that pulls the drain plug closed?
Long thin chrome rod with a big golf tee type top knob part you grab?

I found one of them at the hardware store, bent it a little, gently tapped it up and around through, and out the rope seal came...enough to grab with pliers. Helps to spin the engine from the crank bolt at the same time. Took literally 2 minutes.

P.S. I bought the Corteco 17042 neoprene seal.
 

chad

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If you have any tips for changing out the rear main seal....i would be forever grateful. I am a little anxious about doing it.
there R some tips here. 2, 3 lill dabs of goo, clocking the ends...hang ona min & we'll C them posted...
Some have even gone back to the rope (if not B sure to pull the lill pin or it will pierce the neoprene 1).
 

shreqshack

Active member
Thanks for the responses so far. This feels like prepping for brain surgery....
Once I take the oil pan off, is there anything else I need to loosen or remove to get the rear main seal to come out??
Is there any advantage to doing this with the transmission and flywheel off??
 

chad

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have u used our search function.
most of these proceedures R repeated over and over here
 

bubba22349

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Thanks for the responses so far. This feels like prepping for brain surgery....
Once I take the oil pan off, is there anything else I need to loosen or remove to get the rear main seal to come out??
Is there any advantage to doing this with the transmission and flywheel off??
Directions are located in severial older posts so this is going to be a bit abbreviated. Yes with a manual trans it will need to be pulled out to drop the crankshaft a little bit. Flywheel and clutch could be left on the crankshaft but it will be easier without the extra weight. An Auto Trans car can get by with the trans in place just unbolt the torque converter grom the flex plate and side it back towards the transmission all the way so the torque converters studs will clear the flex plate.

After that unbolt the rear main cap and remove, next loosen up the other main caps closest to rear main will need to be looser and as you go forward towards the front of the engine main cap bolts doesn’t need to be as loose this is so the crankshaft can drop down some at the rear to get the old seal out and in order to install a new rope seal. Replace the seal if your using a neoprene seal in place of a rope you need to remove the nail like pin. Clock the neoprene seal and use a dab of RTB check the older posts for all the details on best methods. To botton it back up Start by pushing crankshaft back up into the main bearings and snug up the main cap bolts Install the rear main cap and then torque all your main cap bolts to spec. Reinstall the oil pan. Reinstall your trans again, and your done
 

B RON CO

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Hi, if you knew of half the issues with rear main seals you would rather perform brain surgery!
My advice is to study a Ford or Chilton's Manual and learn the steps involved.
The job is not self explanatory.
Good luck
 
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