Rear Main Seal Leak after rebuild of 850

(quoted from post at 14:49:59 06/03/21) Thanks, have gone thru all the videos that Hobo suggested. Big problem was that my engine rebuild kit did not come with any instructions for the rear main seal installation. I was using an engine rebuild video that used the rope seal system. Since my engine rebuild kit came with both the neoprene and rope seals, I used both as there were no other instructions. However, I obviously messed up using both types filling both slots in the cap. Have new kit coming this week, should be a quick fix, will break apart the engine from the trans to give me room, but will not put it on a stand (working on my back on a concrete floor will be so much fun. Thanks all, Larry.

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(quoted from post at 16:23:23 06/04/21) OK, got the Fel Pro kit in today. If only I had that kit initially, I would have avoided this issue, as it comes with proper instructions, and I like the neoprene and nail side gaskets as well, better than the fiber ones that came with the rebuild kit. Will follow instructions on gasket offset by 3/8 and very minor use of high temp gasket maker. Have decided to break the engine again from the trans housing in part because it will be easier for my aged body to work, but also because I want to make sure no oil was flung up by the flywheel and dropped onto my new clutch plate. There is one good offshoot to my screw up. By now I know exactly which wrench and socket fits each and every nut and bolt on my 850.

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(quoted from post at 18:53:31 06/06/21) https://www.agkits.com/silicone-gasket-bead-n-seal.aspx#.YL17m_lKiM-

I got the seal kit with the special silicon from NAPA.

If your side seals are good clean an apply RTV its a done deal : )

silicon Part Number: JV8

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Well talked with napa they no longer carry Victor Reinz seals , fel pro now..
The sealant is Mahle, available at O'Reilly but I've already ordered the Victor Reinz sealant and will have it in another day or so 😀
But I will keep looking for the seals, it's not like I need them yesterday it will be a bit

Forum: Ford

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(quoted from post at 16:24:03 06/02/21) OK, rebuild is done, finally got timing correct and runs like a top. BUT. I am getting a serious oil leak between engine and housing. I obviously messed up the rear main seal. I did remove cam and cam cover plate, but that is not the problem. I will re-break the engine tomorrow and replace main seals, but, I have a newbie question. My rear mains seal kit included the side straight gaskets, two half moon neoprene main seals with metal rod inside, and two rope seals. According to a video I saw, I installed both the rope seals and the neoprene seals in the two round slots in the main bearing cap. However, in looking at other sources, it looks as tho one only needs to install the half moon neoprene seals and the side seals, and not install the rope seals, and thus leave the wider of the two round slots in the cap entirely empty. Was I wrong in installing both the rope seal and the neoprene seal? My other questions, as I don't want to do this a third time, is, should I use a small amount of high temp gasket maker anywhere on the cap or the gaskets, and if so where? All I used in the rebuild was some grease. Anyone with some experience in this would be much appreciated, as always. Regards, Larry.

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(quoted from post at 22:44:57 10/24/22) Hey Larry. I m having the same issue you seemed to have had. It s leaking in the same spot but only after the oil system is pressurized. It doesn t leak when the engine is turned off. What did you end up finding out about yours?

(quoted from post at 16:24:03 06/02/21) OK, rebuild is done, finally got timing correct and runs like a top. BUT. I am getting a serious oil leak between engine and housing. I obviously messed up the rear main seal. I did remove cam and cam cover plate, but that is not the problem. I will re-break the engine tomorrow and replace main seals, but, I have a newbie question. My rear mains seal kit included the side straight gaskets, two half moon neoprene main seals with metal rod inside, and two rope seals. According to a video I saw, I installed both the rope seals and the neoprene seals in the two round slots in the main bearing cap. However, in looking at other sources, it looks as tho one only needs to install the half moon neoprene seals and the side seals, and not install the rope seals, and thus leave the wider of the two round slots in the cap entirely empty. Was I wrong in installing both the rope seal and the neoprene seal? My other questions, as I don't want to do this a third time, is, should I use a small amount of high temp gasket maker anywhere on the cap or the gaskets, and if so where? All I used in the rebuild was some grease. Anyone with some experience in this would be much appreciated, as always. Regards, Larry.

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None of them leak if the engine is not running. All of the information is in this thread. You should consider following it. You should also start a new thread. More people will see it.

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