69 Firebird, Pont350, bad valve guide - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-02-2012, 02:57 PM
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69 Firebird, Pont350, bad valve guide

I have oil on my #3 spark plug.
Compression is great.
Vacuum test wavers quickly at 20-21.

I recently switched to Rotella T oil for it's ZDDP content.
Then I read this in a Hot Rod article on the subject:
"The drawback, if any, would be on a high-mileage engine where blow-by can cause detergent to accumulate in the combustion chamber, possibly contributing to detonation."
http://www.hotrod.com/techarticles/e...h/viewall.html

So my solution is to spray Seafoam's "Deep Creep" into the combustion chamber through the spark plug hole fairly frequently to prevent the detergent from accumulating. Is this a fair idea?

Also is it correct that I cannot really do anything about the leaky valve guide without pulling off the head as well?

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Old 03-02-2012, 03:58 PM
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As far as I know, deep creep is a lubricant, not really a cleaner.
If you want to run a cleaner through it you can do it 2 ways, you can get a bottle of regular seafoam and connect a small vacuum line to it and let it draw it in. Then give it a occasional rev. Be warned it'll smoke the neighborhood out. Or you can do it down the gullet style which is pour it down the throat of the carb while you work the throttle to keep it from going dead. You can also use water down the gullet and it works just as well as the water is burned into steam and the steam removes the carbon buildup.
If just 1 valve guide is leaking is it due to the seal or is it because the guide itself is bad? If it's just a seal you can replace the seal. Get the offending cylinder half way up the bore on the compression stroke, use small rope and route as much as you can into the cylinder, then slowly move the piston up until it stops and won't go any higher. Next remove the rocker then use a spring compressor to remove the spring, replace the seal then reassemble in reverse order. If the guide is bad there's nothing you can do for it other than removing the heads and having new guides installed.
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Old 03-03-2012, 08:45 AM
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Oil on #3 plug.....

Hi,there is an adapter that fits on the electrode end of the plug,usually used on engines that burn oil, this adapter places the electrode end further up into the head, i dont know where you can buy them,i would try NAPA.
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Old 03-04-2012, 12:57 PM
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Quote:
Originally Posted by Nuck Chorris
I have oil on my #3 spark plug.
Compression is great.
Vacuum test wavers quickly at 20-21.

I recently switched to Rotella T oil for it's ZDDP content.
Then I read this in a Hot Rod article on the subject:
"The drawback, if any, would be on a high-mileage engine where blow-by can cause detergent to accumulate in the combustion chamber, possibly contributing to detonation."
http://www.hotrod.com/techarticles/e...h/viewall.html

So my solution is to spray Seafoam's "Deep Creep" into the combustion chamber through the spark plug hole fairly frequently to prevent the detergent from accumulating. Is this a fair idea?

Also is it correct that I cannot really do anything about the leaky valve guide without pulling off the head as well?
The valve stem seals can be replaced w/the heads on the engine if need be...

If oil is getting into the chamber, there is going to be carbon build-up over time. The oil alone can increase the chance of detonation, regardless of any build-up, though.

Best bet is to fix the problem rather than treat the symptoms- as I'm sure you realize.
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Old 03-10-2012, 02:26 PM
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So my friend tells me that I could replace the valve stem seals and that that action would probably fix my oil problem. I would do it in a similar manner to this.
http://www.youtube.com/watch?v=ob_4-F-m1FI
My friend also told me the redneck method of keeping the valves from falling would be to stuff a bunch of rope in the cylinder, then bring the piston up to tdc. Would that work?
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Old 03-10-2012, 03:30 PM
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I take it you didn't read my post very well? If your not going to read what I said then perhaps I shouldn't have wasted my time posting. Furthermore, the "redneck" method with rope is far better than pressurizing the cylinder with air, as if you just happen to tap one of the valves it drops.
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Old 03-15-2012, 12:21 PM
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sorry I didn't read your post closely enough
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