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Old 07-14-2013, 04:27 PM
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Small block chevy tick

Can someone please help me out! My 350 is ticking it's coming from the passenger side.. I thought it was maybe a stuck lifter, replaced all the lifters and pushrods. It was gone at first then later came back. Readjusted valves countless times. I've tried changing plug wires, header gaskets, even went as far as changing the flywheel. However I found that the tick is coming from the number 4 cylinder exhaust valve. You can tighten down on it really tight til it's about to cut the motor off but it slowly comes back. Motor has good oil pressure. Give me your opinions on it thanks!

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Old 07-14-2013, 04:32 PM
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Quote:
Originally Posted by Jeffery620 View Post
Can someone please help me out! My 350 is ticking it's coming from the passenger side.. I thought it was maybe a stuck lifter, replaced all the lifters and pushrods. It was gone at first then later came back. Readjusted valves countless times. I've tried changing plug wires, header gaskets, even went as far as changing the flywheel. However I found that the tick is coming from the number 4 cylinder exhaust valve. You can tighten down on it really tight til it's about to cut the motor off but it slowly comes back. Motor has good oil pressure. Give me your opinions on it thanks!
1. Lifter leaking down.
2. Rocker stud pulling up out of the head due to excessive valve spring pressure (studs are press fit from the factory).
3. Cam lobe(s) going flat.
No matter the cause, there is an engine disassembly in your future.
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Old 07-14-2013, 04:37 PM
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Need more info on engine. Year model,flat tappet,roller,rocker arm type ????
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Old 07-14-2013, 05:12 PM
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Not sure of year model haven't looked up casting number. It's a flat tappet, with the stock factory rockers .
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Old 07-14-2013, 05:23 PM
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Sure it's not a wrist pin ???
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Old 07-14-2013, 06:15 PM
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If I had to guess I'd say you prolly got a flat cam lobe since you put in new(they are new ??) lifters & you say it goes away after adjustment only to return.Does it have any misfire'or'is it running smooth?
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Old 07-14-2013, 06:22 PM
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Before you tear the engine apart, be sure this "tick" is NOT an exhaust leak! I've heard some exhaust leaks that many would pass off as an engine noise, or lifter noise. Especially if this engine has headers!
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Old 07-14-2013, 06:43 PM
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Originally Posted by 1971BB427 View Post
Before you tear the engine apart, be sure this "tick" is NOT an exhaust leak! I've heard some exhaust leaks that many would pass off as an engine noise, or lifter noise. Especially if this engine has headers!
Absolutely !!!! Header leaks wether from gaskets,pin holes or whatever can make for weird noises.I wish I a $ for every valve cover that has been popped off for a header leak !!!
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Old 07-14-2013, 07:19 PM
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Before you tear the engine apart, be sure this "tick" is NOT an exhaust leak! I've heard some exhaust leaks that many would pass off as an engine noise, or lifter noise. Especially if this engine has headers!
OP said this in his opening statement:
"I've tried changing plug wires, header gaskets, even went as far as changing the flywheel."
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Old 07-14-2013, 07:23 PM
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Originally Posted by techinspector1 View Post
OP said this in his opening statement:
"I've tried changing plug wires, header gaskets, even went as far as changing the flywheel."
Yes, I saw that, but I've also seen new gaskets leak, or a hole/crack in exhaust cause a leak. Just because he has new gaskets doesn't mean he doesn't have an exhaust leak.
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Old 07-14-2013, 07:36 PM
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Yes, I saw that, but I've also seen new gaskets leak, or a hole/crack in exhaust cause a leak. Just because he has new gaskets doesn't mean he doesn't have an exhaust leak.
You are correct. Thank you.
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Old 07-14-2013, 07:38 PM
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He does say it goes away when tightening down on lifter,but, his description of tightening it down could be masking even an exhaust leak if he's going so far as to make the engine die.
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Old 07-14-2013, 07:43 PM
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Yes the lifters are brand new. Let set in oil over night before putting them in also. I don't really think it's an exhaust leak sense it stops when you over tighten the rocker.. But yes it misses a little! I took it back apart last night and pulled that one lifter out and it didn't have a dish in it, it was still flat so idk if its a cam lobe. I don't know what's going on!!!
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Old 07-14-2013, 07:55 PM
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if tightening rocker down so far as to hold a valve open & keeping it from fully seating,cylinder would have little to no compression making even an exhaust leak go away or @ least quiet down.It wuz just a thought based on your description of tightening lifter down.It does however seem more like a worn or flat lobe tho since you state that it goes away for short period after adjustment.As Tech stated tho,ck the hgt on all your studs also to make sure you don't have 1 trying to pull out,or,even a very worn,bent rocker arm.
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Old 07-14-2013, 07:58 PM
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Over tightening to remove the click may be masking the sound by creating a dead cylinder. Even an exhaust leak will go away if you tighten the lifter far enough to keep that cylinder from compressing by opening the valve totally.
Set the lifters to cam spec, and look for the real cause of the noise. You my need to get a stethescope to pin it down closer. If by chance it is an exhaust leak, you can find it by sticking a old feather around the exhaust ports and see if a leak moves it as it passes by. Probably too hot to put your hand or fingers down there and feel for a leak.
Had one come by just two weeks ago for a lifter adjustment, and had new gaskets on it. I found a crack in a header flange on one port. Pulled the headers and welded the crack up. New set of gaskets, and the weld fixed the tick.
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