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4.0 Front crank seal replacement


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I was feeling kind of lazy and decided to change the front cover seal without pulling the timing cover. The hardest part was getting the old seal out, I bought the Lisle seal puller below, but it just couldn't quite do the job. I was able to finagle my standard puller in to finish the job. 

The Boa Constrictor metal band clamp works great to keep the engine from turning while loosening or tightening the crank bolt. 

Installation would have been a bit more difficult without the Jeep special tool, you'd need to find a big socket or a piece of tubing. I'd recommend buying the FelPro set with the sleeve, it's only about $5.00 more than buying the bare seal. If your damper has a groove worn into it, you install the sleeve over it. I elected to buy a new Dorman damper.

I've hammered balancers on with a block of wood between the hammer before, but that's probably not happening with the radiator installed.  My Proform installer "for small and big block Chevys" worked perfectly.

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2 hours ago, Htchevyii said:

Its a little tricky with the crank snout poking out, but maybe?

Just knocked one out last week. Works like a charm. I used a small rubber mallet to tap the seal in. Make sure to grease the seal or the area the balancer will ride in before putting it back together. My balancer had seen better days 😂 the chunk missing from the timing chain cover wasn’t from me. 

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Filling the back side of the seal with grease also helps to keep the spring from becoming dislodged when you're installing, thanks for the reminder.

Wow! that balancer was toast! It looks like maybe someone screwed a bolt for the puller too far in and hit the cover?

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2 hours ago, Htchevyii said:

Filling the back side of the seal with grease also helps to keep the spring from becoming dislodged when you're installing, thanks for the reminder.

Wow! that balancer was toast! It looks like maybe someone screwed a bolt for the puller too far in and hit the cover?

I was trying to figure out what the PO did. What ever it was they almost messed up big time 😂 

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