Checking heads
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Post Fiend
Joined: Nov 2001
Posts: 14,947
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From: Topsfield, MA
Checking heads
I have some GT-40Y heads that were on my engine for a little while and are now removed and in storage.
The engine was making a tapping sound, almost like a lifter tap, when it was running. It was on #1-#4 but not really sure which one it was. The lifters were fine, the pushrods and rockers were fine, not making contact with the valve covers either. The valvetrain was professionally setup as I didn't do it.
I'm trying to check and see if my heads were fine, maybe a valveguide?
Can a bad valveguide cause a tapping sound?
It was a "tick tick tick" metal on metal sound that followed RPM, wasn't an exhaust leak.
So if it's possibly a valveguide thing...is it easy enough for me to take apart the valvetrain on the heads? I've never done it before...I have access to a spring compressor but am not sure if other tools are required to get the retainers out or do anything else.
Any info would be great, thanks.
The engine was making a tapping sound, almost like a lifter tap, when it was running. It was on #1-#4 but not really sure which one it was. The lifters were fine, the pushrods and rockers were fine, not making contact with the valve covers either. The valvetrain was professionally setup as I didn't do it.
I'm trying to check and see if my heads were fine, maybe a valveguide?
Can a bad valveguide cause a tapping sound?
It was a "tick tick tick" metal on metal sound that followed RPM, wasn't an exhaust leak.
So if it's possibly a valveguide thing...is it easy enough for me to take apart the valvetrain on the heads? I've never done it before...I have access to a spring compressor but am not sure if other tools are required to get the retainers out or do anything else.
Any info would be great, thanks.
Elder User
Joined: Mar 2004
Posts: 660
Likes: 0
Noise can be sign of guide problems. If you have a spring compresser then you can remove the valves no problem and inspect the valve stems for scoring. I'd just have a good head shop tear it down and inspect it, and they can effect the repair if needed.
Hotshot
Joined: May 2004
Posts: 12,170
Likes: 5
From: The hills of No. Calif.
Also, even with the heads assembled you can grasp the retainer and check for lateral movement. If you have one that's bad it should move more than the the others, but with fairly fresh heads there should be almost no discernable movement.
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Post Fiend
Joined: Nov 2001
Posts: 14,947
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From: Topsfield, MA
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FTE Chapter Leader
Joined: Sep 2000
Posts: 3,862
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From: Beachville, Ontario
Was the spark plug tightened properly? I've seen a loose spark plug make the sound you are describing.
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