[v12-engine] Oil leak at alternator bracket

I believe I may have located the reason the lower right side of my 5.3 HE
('86 XJS) is covered in oil … weepage from the lower rear alternator
mounting bracket bolt. This is the cast aluminum bracket bolted directly to
the block.
Seem to recall this issue being mentioned somewhere but can not find the
source. Have others found this problem?
Any ideas on how to effectively seal that bolt? My concern is with trying
to clean the threads well enough for a sealer to bond.
Thanks for any feedback.
Charlie

btw - just finished the replacement fuel injector harnesses. They are
marvelous! They even bend in all the right places!

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Charlie Welkie wrote:

I believe I may have located the reason the lower right side of my 5.3
HE ('86 XJS) is covered in oil … weepage from the lower rear
alternator mounting bracket bolt. This is the cast aluminum bracket
bolted directly to the block.

I hope not. That’s a bottomed hole; if it’s leaking, you have a
cracked block.

– Kirbert
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I hope not. That’s a bottomed hole; if it’s leaking, you have a
cracked block.

Thanks for the good news!
Careful examination shows no cracking around the bolt / thread boss. There
is oil inside the hole though. The bolt is wet with oil when removed and a
probe inserted in the hole gets wet.
If cracked, it must on the inside.
Charlie

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Probably not where the leak is coming from. Most likely it is coming from
the timing cover or cam cover. If it is the alternator bracket bolt, just
pull it out, clean it & the hole & put some silicone on the bolt threads. It
wouldn’t be a pressure leak so you will be okay.

Phil>From: “Kirbert” palmk@nettally.com

To: “v12” v12-engine@jag-lovers.org
Subject: Re: [v12-engine] Oil leak at alternator bracket
Date: Sat, 5 Jan 2002 20:04:11 -0500

Charlie Welkie wrote:

I believe I may have located the reason the lower right side of my 5.3
HE ('86 XJS) is covered in oil … weepage from the lower rear
alternator mounting bracket bolt. This is the cast aluminum bracket
bolted directly to the block.

I hope not. That’s a bottomed hole; if it’s leaking, you have a
cracked block.

– Kirbert
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