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Username Post: Any tips for sealing up a 2 piece rear seal?        (Topic#276760)
kangaroo 
Member
Posts: 234

Reg: 11-04-06
02-21-12 10:56 AM - Post#2193373    

I ,like others, have always had issues with the rear seal leaking. I am going to be putting my engine back together and would like to see if some one has had better luck. Its been a few years for me also and dont know if maybe I am missing some thing. Thanks



 


55chevy383 
Silver Supporting Member
Posts: 1447
55chevy383
Age: 50
Loc: Noble, Ok.
Reg: 12-08-05
02-21-12 11:05 AM - Post#2193379    
    In response to kangaroo

Do not align the seal seem with the block and main cap, offset the seal a little, you can use a very small dab of sealant as well.

Phil

11.22 @ 117 N/A.
Phil's '55


 
62chevy427 
"12th Year" Silver Supporting Member
Posts: 2163
62chevy427
Loc: laurens sc
Reg: 04-13-06
02-21-12 11:13 AM - Post#2193383    
    In response to 55chevy383

that is the way i always do it. no leaks.

56 bel air ((since 2002)
62 impala ss (since 1965)
65 el camino (since 1969)
66 nova (since 1987)
67 malibu convertible (since 1981)
72 el camino ss454 (since 1985)
83 gmc 4wd (since 1991)
95 impala (new)
15 chevy equinox



 
DeltaT 
Frequent Contributor
Posts: 1023
DeltaT
Loc: San Jose area, CA, USA
Reg: 06-20-02
02-21-12 12:32 PM - Post#2193419    
    In response to 62chevy427

That and use the best metal-core Felpro seal you can get for your motor. I have had fewer leaks with the metal core versions than I have with the soft core ones.

Jim



 
Lead sled 
Frequent Contributor
Posts: 1925
Lead sled
Age: 59
Loc: Walton,NY.
Reg: 11-04-09
02-21-12 12:33 PM - Post#2193421    
    In response to 62chevy427

That's how it's done

Late yr model (Dec. 51 BelAir/ 52 trim), with a basically stock 67 Camaro SS350/295hp Turbo Fire Edelbrock 1405, Saginaw 4spd/355 geared 55/6 Chevy rear.2,1st place,and 1 top five award trophies so far
http://www.picturetrail.com/bris51deluxe


 
grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 17284
grumpyvette
Age: 71
Loc: FLORIDA USA
Reg: 03-16-01
02-21-12 12:38 PM - Post#2193423    
    In response to Lead sled

http://forum.grumpysperformance.com/viewtopic.php?...

IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!


 
triplefive 
Contributor
Posts: 700
triplefive
Loc: Brisbane Australia
Reg: 07-08-11
02-21-12 11:32 PM - Post#2193669    
    In response to grumpyvette

50% of the time, it's not the seal that's leaking, it's oil coming out from between the rear main cap and the block. It does this, mostly because there's oil under pressure from the oil pump there.

Before installing the main cap, paint a small track of sealant on the flat surface from the crank seal to the pan seal (Permatex aviation gasket cement is good for this bit).

Also, is the journal where the seal will run pre lubed (with oil if it'll be running soon or grease if it'll be sitting a while?

Procrastination; the one thing I never put off until tomorrow.


 
CNC BLOCKS N/E 
Senior Member
Posts: 977

Loc: NORTH EAST
Reg: 12-12-03
02-22-12 05:45 AM - Post#2193706    
    In response to triplefive

The problem I have seen with offsetting the rear seal is an engine came in that another shop built and the seal was offset and when the rear cap was installed it peeled the back of the seal off and stacked up under the rear main cap.

Personally I have never offset a seal yet as GM has sent million of engines out the door and none of there sealwere offset that I know of.

I use a good seal not a cheap one, silicon so far no issues.



 
Trucked_up 
Valued Contributor
Posts: 4948

Loc: 315 er
Reg: 03-23-02
02-22-12 02:02 PM - Post#2193900    
    In response to CNC BLOCKS N/E

I just did an engine ...I never had problems with seals in the past other than a drop or two leak depending crank condition etc.
So this time I offset the seal slightly as many guys claim they do......It leaked enough so I had to replace it.Set the second seal "even", no leaks.



 
72novaproject 
Senior Member
Posts: 3221
72novaproject
Age: 63
Loc: D/FW Texas
Reg: 02-18-03
02-25-12 07:33 AM - Post#2194957    
    In response to Trucked_up

Ya know, I was a line tech for a Chevy dealership(s) for a long time and that rear seal was not as big of a problem as it has been made out to be by the magazines and just general folk lore. I didn’t replace any more of those than I did the freeze plugs between the engine and trans or even front pump seals in transmissions. There are a lot of things besides the rear main seal that can leak back there and it all ends up on or in the flywheel inspection cover so it looks like a rear main seal leak when you see a spot in your driveway. I am not saying the reputation is not deserved but it’s not like all of them leak. I have never offset the seal in any of them and never had a recheck.

Steve


To each problem exists a solution...now think.

The ZD Nova Page


 
grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 17284
grumpyvette
Age: 71
Loc: FLORIDA USA
Reg: 03-16-01
02-25-12 07:40 AM - Post#2194960    
    In response to 72novaproject

IVE installed some rear seals with the ends offset and some flush, Ive never had one leak in 40 plus years, if you have the seal leak its been my experience looking at engines Ive repaired that about 80% of the leaks are due to improper installation and 20% due to rarely if ever doing oil changes so wear was the root cause of the leak due to sludge in the oil

http://forum.grumpysperformance.com/viewtopic.php?...

IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!


 
donhughes 
Member
Posts: 38
donhughes
Loc: conway SC
Reg: 08-13-03
02-25-12 07:04 PM - Post#2195223    
    In response to kangaroo

Extra empahasis on everthing being clean,light coating of oil on the seal & crank. Offset seal slightly above block base, other half slightly below opposite side. I have used permatex ultra gray on corners of rear main cap seal area. Then fel pro black pan gaskets with ultra gray at front and rear corners. Recently used a 1 piece pan gasket from milodon , I probably just got a bad one cause it definetly leaked . Hope that helps



 
CNC BLOCKS N/E 
Senior Member
Posts: 977

Loc: NORTH EAST
Reg: 12-12-03
02-26-12 06:18 AM - Post#2195325    
    In response to donhughes

  • donhughes Said:
Extra empahasis on everthing being clean,light coating of oil on the seal & crank. Offset seal slightly above block base, other half slightly below opposite side. I have used permatex ultra gray on corners of rear main cap seal area. Then fel pro black pan gaskets with ultra gray at front and rear corners. Recently used a 1 piece pan gasket from milodon , I probably just got a bad one cause it definetly leaked . Hope that helps



Was that the blue chinese gasket??




 
donhughes 
Member
Posts: 38
donhughes
Loc: conway SC
Reg: 08-13-03
02-27-12 08:58 AM - Post#2195822    
    In response to CNC BLOCKS N/E

No ,I considered those but ended up buying the milodon #41000 oil pan gasket. It is 1 pc black. As I mentioned it definetly did leak.It did fit nicely in my trash can though. So I pulled it and went to the fel pro 4 pc black. The only thing i could figure is the Milodon has these steel sleeves for each hole (to insure you don't overtighten)



 


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