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Head Bolt Oil Leak


brianstj

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My machinist informed me that the rear driver side head bolt hole normally has oil pressure running through it. I am getting a leak around the head bolt that is filling up the pockets next to the distributor housing. I was planning on putting some silicone around the head bolt washer. Any thoughts/experiences on this?

Brian

'72 2002

Brian

'72 2002

'91 325i

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I actually goop a bit of silicone around the head and washer of that bolt.

But it really shouldn't leak- check all the surfaces, yep, change the washer...

t

"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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Hello,

Just went through the same thing of sorts.

I sourced Loctite 562, a high temp thread sealant, thoroughly cleaned the threads to remove all traces of oil and then used the sealant to replace the studs.

Cheers

Jane

Jane Loveshack 008 73tii s/r 5spd suspension techniques spring, kybs

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Guest Anonymous

I have never seen anything more than a minor "weep" from the subject bolt. A torqued head bolt with a clean straight head bolt washer should completely seal the bolt.

The manual does not make any allowance for permatex or thread locker, nor have I heard or this except with the use of aftermarket studs. I guess if it works, the next question is for how long and are there any unintended consequences. I wouldn't be surprised to learn that someone on this board "O"ringed the head bolts too?

Different strokes!

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I was informed that this particular bolt hole normally has oil pressure running through it. With good bolts/washers and proper torqing it stays sealed up. I had the washer installed flipped over from the previous installation - there was a little bit of a ring impression left from the bolt, and I had this side sitting on the head. I flipped the washer over and added a thin layer of black silicone to the washer for good measure (based on advice from a couple different sources). Everything seems fine now, but I will definitely keep an eye on it for a while.

Another interesting thing I learned - if you are running ARP head studs instead of bolts, you have to seal the threads on that particular bolt.

Brian

'72 2002

Brian

'72 2002

'91 325i

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