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-   -   Front/rear main seals question (https://honda-tech.com/forums/engine-machining-assembly-164/front-rear-main-seals-question-3332848/)

turboLScrx 01-19-2019 10:21 AM
Front/rear main seals question
 
I’ve been told that replacing the crank seal could lead to another potential issue, the original seal wears a little groove into the crank and when the new seal gets installed the new seal don’t have the same groove and oil will leak/poor out because of this. My buddy had this happen to him and I’ve heard other stories as well, I know there is supposed to be a way to fix this but I was curious if others here have experienced this issue and how they resolved it. I’m about to start my engine assembly soon and want to prevent any possible problems before they happen.

B18c1
‘’Thanks

JRCivic1 01-19-2019 09:21 PM
Re: Front/rear main seals question
 
I have never experienced the issues that you have described, however, IF you install the seals at the proper depth there will be no problems because the spring area of the seal will find it's way to the groove on the crankshaft.

DaX 01-20-2019 04:13 AM
Re: Front/rear main seals question
 
I've done 2 or 3 rear main seals and never had the leaking issue. I always follow the manual and install the seal to the depth required, checking with feeler gauges. I've never replaced just the front main seal - the times I've had an engine that far apart I have always put a new oil pump in, so not sure about that one.

turboLScrx 01-20-2019 05:36 AM
Re: Front/rear main seals question
 
I don’t think I’m going to have a issue, just trying to avoid one

chrysanderson 01-20-2019 04:28 PM
Re: Front/rear main seals question
 
some seals come pre-lubed where the crank and seal meet. so make sure to check for that, and if its not then lube it up!
putting it in dry is no bueno.

JRCivic1 01-20-2019 09:44 PM
Re: Front/rear main seals question
 
Originally Posted by chrysanderson (Post 51837606)
some seals come pre-lubed where the crank and seal meet. so make sure to check for that, and if its not then lube it up!
putting it in dry is no bueno.
Yes, and even then I have always used some Vaseline (generously applied to the crankshaft and the contact area of the seal) to be sure that installation goes smoothly.

turboLScrx 01-21-2019 04:32 AM
Re: Front/rear main seals question
 
Some good advise guys.

Thanks

Krg76 02-22-2019 06:21 PM
Re: Front/rear main seals question
 

https://cimg1.ibsrv.net/gimg/honda-t...7f8139f65.jpeg
Hello. I installed a new rear main seal tonight on my 2000 Honda Accord 2.3. I installed it flush. It was a bit of a pain. I am including a pic and wanted to get opinions on if the installation looks ok, from what you can tell from the pic. I couldn’t find any else to post this so I though I’d try this thread. Any info would be appreciated. Thanks.

motoxxxman 02-24-2019 07:52 AM
Re: Front/rear main seals question
 
Originally Posted by Krg76 (Post 51869766)
Hello. I installed a new rear main seal tonight on my 2000 Honda Accord 2.3. I installed it flush. It was a bit of a pain. I am including a pic and wanted to get opinions on if the installation looks ok, from what you can tell from the pic. I couldn’t find any else to post this so I though I’d try this thread. Any info would be appreciated. Thanks.
looks fine to me

Krg76 02-24-2019 11:23 AM
Re: Front/rear main seals question
 
Originally Posted by motoxxxman (Post 51870421)
looks fine to me
Thanks for the response. We buttoned it all back up and it leaks. This is the second Time i did it in the past week. Each time, new seal. I took the trans back out for a third try. Not sure what I’m missing.

motoxxxman 02-24-2019 12:20 PM
Re: Front/rear main seals question
 
Originally Posted by Krg76 (Post 51870502)

Thanks for the response. We buttoned it all back up and it leaks. This is the second Time i did it in the past week. Each time, new seal. I took the trans back out for a third try. Not sure what I’m missing.
make sure the outside of the seal and the seal bore in the block is bone dry and clean. Put a thin layer of gray rtv on the outer edge of the seal. This will help it slide in easier, and will make it seal flawlessly with the block, and once cured will hold it in place so it doesn't pop out. 9/10 times a new seal leaks, it's because the seal either pops out or it leaks between the block and seal.
you can also push the seal in a little deeper too. It does not need to be in the exact same location as it was originally.

Krg76 02-24-2019 01:17 PM
Re: Front/rear main seals question
 
Ok. Thanks for all the advice! I noticed the original seal from the first time we took it apart, was flush with the plate it’s seated in. We pushed the second one in til it stopped. Past the flush point. This one, we tried flush and it leaked. Do you know how far to press them in and also, I did notice a slight ridge worn in crankshaft. Is that gonna have any effect on another seal install? Thanks again.

turboLScrx 02-24-2019 03:14 PM
Re: Front/rear main seals question
 
In that photo it looks like the seal is turned or flipped, it could just be the angle the photo was taken. I was worried that mine was going to leak since I could feel the groove the old seal had made, but made sure to try to line the new seal up with the old groove and it dry so far

motoxxxman 02-24-2019 06:28 PM
Re: Front/rear main seals question
 
actually, you'll tend to have a higher chance of it leaking if the new seal sits in the same ridge as was worn by the old seal. Because you can almost never get it 100% exactly the same as the old seal. I always set it to a depth that makes it NOT sit on the groove, but rather an un-worn surface. For depth, it really doesn't matter. as long as it's not sticking out.

Krg76 02-25-2019 01:12 AM
Re: Front/rear main seals question
 
Ok. Thanks for all the responses! When I order a new seal this week, we are goin to try again.

Krg76 02-25-2019 05:22 AM
Re: Front/rear main seals question
 
Another question. The housing plate that the seal is pressed into. Would it be better to take it off the motor or leave it on for a new seal install? Thanks.

motoxxxman 02-25-2019 07:17 AM
Re: Front/rear main seals question
 
Originally Posted by Krg76 (Post 51870964)
Another question. The housing plate that the seal is pressed into. Would it be better to take it off the motor or leave it on for a new seal install? Thanks.
either way is fine. I've found removing the seal is easier when the housing is still bolted to the block, and install is a hair easier when the housing is removed. Just make sure you don't damage the crank at all; it's not too difficult to scratch the crank when pulling the seal or denting the crank when hammering the seal in. Either way though, if your setup has a removable housing, I strongly suggest removing and reinstalling the housing just to make sure the housing seals properly from the block. Sometimes the seal install process can break the seal between the housing and block. It's rare, but it can happen

DaX 02-25-2019 07:48 AM
Re: Front/rear main seals question
 
I always pull the plate off for removal and installation of the new seal, but I use a seal driver set for installation, so it has to be off or the driver won't fit.

Krg76 02-26-2019 02:58 PM
Re: Front/rear main seals question
 
Ok. Tonight we pulled the plate/housing for the rear main seal off of the motor. I was just checking some things out. First, the seal sets in the housing nice and tight. As for the crank. It has some blemishes and a very slight ridge in it that you can barely feel with your fingernail. Also, I put the old seal over the crank(without the housing) just to see how it fits and its real sloppy on the crank. I would think it should fit a little tighter than it does. Does anyone have any idea about that? All this has me thinking about installing a repair sleeve. Any input would be appreciated. Thanks

Krg76 02-26-2019 03:09 PM
Re: Front/rear main seals question
 


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