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Old 11-26-2011, 04:32 PM
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Default Front Main Seal is leaking...

I'm at a loss... I've put my car back together and the only major problem I've had is the front main seal leaks.... like a 1/2 a quart in 20 mins. It didnt leak before and the only difference is new cam, new pistons/rings, new timing chain, and damper.

here have been my steps i've taken.

- started with the old seal (felpro) (1yr old/20kmi on it) and the balancer that was on it when i took it apart

- the balancer had a goove in it so i got a new balancer (couldnt find a repair sleeve at the time)

- replaced the old seal with another (felpro)

- replaced the seal again (possible failty seal, nick in the lip of the seal) (with felpro defective swap)

- use a repair sleeve on the old balancer with the felpro seal

and still leaks.

i'm going to grab the timken seal which is made differently and its like 12 buck (much more expensive than the felpro) and hopefully stop this leak so i can drive my car.

if anyone has any other suggestions please reply


Grooved balancer:

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Last edited by xpbr2000; 10-24-2017 at 02:09 PM.
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Old 11-26-2011, 05:53 PM
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So you sure its the front main leaking and not the timing cover?
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Old 11-26-2011, 06:07 PM
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Yup you can see the oil trail coming from the seal
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Old 11-26-2011, 06:24 PM
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I should also mention that the oil pressure is a little higher than it use to be as well
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Old 11-26-2011, 07:19 PM
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Hmmmmm, well high oil pressure shouldn't be blowing out the front seal, unless there is a oil passage plug on the front of the block that got left out and there is excessive oil goin into the timing cover causing a leak, other than that I'm not sure. Make sure you didn't gouge the timing cover where the seal presses up to. That could make a leak to.
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Old 11-26-2011, 07:35 PM
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Yeah I double checked all that. I even siliconed the outside of the seal just in case. But it leaks around the balance shaft. Ive wiped it clean every time and it always shows oil straight down from the seal and all over the balancer
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Old 11-28-2011, 01:45 AM
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ok so here was my problem.... the felpro seal just wouldn't cut it. i also had a groove in my balancer. here is what worked.... (note: that i probably shouldn't have tried the repair sleeve... it cost me a 100 buck for a new balancer )

until now i didnt see the second wear line a little lower on the shaft

old balancer:



old balancer with sleeve:








so do not try the repair sleeve by felpro. it doesn't cover it enough. you will end up with a torn seal like this...












now this is what worked..... a timken seal 710162. autozone sells them and they are like 20 bucks. seal is a smaller dia and very flexible compared to the felpro. much better seal.









long story short i probably could have used my old balancer and this seal with no additional sleeve. but the sleeve is now perminent to the shaft
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