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Old 07-06-2018, 07:49 PM   #1
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Default 87 VG30 Valve Chatter

Hello Everyone,

My understanding is that the valve chatter is pretty normal on these engines. The Chilton manual says they cannot be adjusted so there's no hope there. Has anyone found some sort of oil concoction or anything else that helps to quiet the valves?

Thanks,
Andrew
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Old 07-06-2018, 08:31 PM   #2
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The lifter clatter is due to one or more lifters not pumping up and holding oil like.it should. The best fix is to replace all 12 of them. It'll clatter like hell until they are all bled and pumped up. It'll be about 10 minutes of horrible noises.



You can try a heavier oil but anything but a lifter replacement is only a bandaid.
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Old 07-07-2018, 01:57 PM   #3
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Make sure it is valve clatter and not an exhaust manifold leak.

The studs on the VG30 engines break easily, and the "tick" noise coming from a leaking exhaust manifold can sound a lot like a lifter.
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Old 07-07-2018, 03:23 PM   #4
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as JP suggested, those engines had more issues with broken exhaust manifold studs than lifter issues, I would look into that 1st
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Old 07-08-2018, 06:51 PM   #5
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Quote:
Originally Posted by YEPEE View Post
as JP suggested, those engines had more issues with broken exhaust manifold studs than lifter issues, I would look into that 1st
There is definitely an exhaust leak but as the engine warms up it goes away. The valve chatter is very cyclical. It's significantly better when everything is warm bit there's still a metallic tick on the driver side.

What's involved with replacing lifters?
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Old 07-08-2018, 07:10 PM   #6
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You probably have a broken stud for the exhaust leak. Best to fix that before it erodes the exhaust port.



To replace the lifters you pull the valve covers, pull the bolts for the rocker assembly, pull the lifter holders out and poke the lifters out. They may fall out as you remove the assembly.



You can semi pre bleed the lifters by dunking them in oil for a while. You should replace rockers at the same time. It'll become a $300+ job pretty quick even if you do it yourself.



When putting everything back together use lots of assembly lube. It will should like a bucket of bolts in a paint shaker until the air gets pushed out. The bleed procedure is to run the truck at 2000RPM (I think. Check your Chilton's) for 10 minutes.



Might be worth putting a detergent in there or try a slightly thicker oil. Might just have some crap built up.
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Old 07-08-2018, 07:17 PM   #7
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Quote:
Originally Posted by Deerhurst View Post

Might be worth putting a detergent in there or try a slightly thicker oil. Might just have some crap built up.
Seconding this, pouring something like rislone in there is a quick and easy way to tell if it's a lifter or a broken exhaust stud. I have a couple of lifters that are a bit noisy and I find that half a quart of rislone in the oil helps it run a bit quieter. It's pretty good at quieting things down, if it doesn't quiet down within 10-15 minutes of running it's probably a broken exhaust stud. While I don't own one personally I've noticed that this problem affects V engines more than inlines or boxers. It's also a common issue on mopars and ford's modular monstrosities.
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Old 07-08-2018, 09:11 PM   #8
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The noisy ticking sound from broken exhaust bolts also goes away as the engine warms up, because the metal expands and seals the gaps.

Replacing exhaust studs is a much faster job than replacing lifters. If it turns out to be the lifters, you can always attack that job later.
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Old 07-10-2018, 03:25 AM   #9
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My favorite add-on for quieting noisy lifters is to use one full quart of Lucas Oil treatment...and then fill up the rest of the crankcase with the recommended oil. If you do this again within 1,500 additional miles, instead of going the full 3,000 it seems to work better.

Also...if you don't know how clean your engine is, you can sometimes get good results by dumping some of your old oil...adding TWO quarts of Rislone...running for fifty miles...and then dumping everything.

Pull oil pan. Scrape and clean pan. Add the Lucas thing I mentioned.

But these other folks are right about one thing. You have to fix the exhaust leak FIRST before trying any of that stuff I listed.
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Old 07-10-2018, 05:32 PM   #10
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mine doesnt have any valve noise per say, but the engine does have a lifter raising hell. i need to replace the lifters. if i drive it on the freeway for more than an hour above 70 mph, the lifter does not make a sound. but the tick returns in a few minutes.
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