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#1 |
Registered User
![]() Join Date: Apr 2014
Location: Thousand Oaks, CA
Posts: 118
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Mystery engine noise, hyd. lifters? Help guys...
Hi, factory 402BB/400TH, headers, 1970 CST/400
I posted this about a year ago and have some follow up. STILL a mystery to me, hoping someone can help please. I am hearing a "ticking" noise in my engine compartment that I'd say sounds just like a sticky lifter. We've all heard this ticking before with hydraulic lifters... However, I recently replaced all my lifters and found a bad one (did a happy dance thinking I had it licked!) I did not change the cam. Valve adjustment done many times, timed well and sounds great. Runs great. STILL ticking. Ugh!! So annoying. Here are some details: 1. quiet with covers off, adjusted fine, all 16 valves. quite with covers on. 2. increase ticking on acceleration, decrease on deceleration. 3. lifters new, exh. manifold gaskets new, header to muffler gasket new 4. sometimes makes no noise at all 5. hot or cold same symptoms See pic, I've been told the low profile valve covers sometimes have clearence problems? Don't think it's speedo cable... Any ideas? Thanks guys!!
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1967 C10: My next project 1964 SS Impala Hardtop, low and slow 2007 Harley Street Glide .... When all else fails to start. |
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#2 |
Registered User
Join Date: Mar 2013
Location: Anaheim Hills, CA
Posts: 323
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Re: Mystery engine noise, hyd. lifters? Help guys...
I am subscribing to this thread. My 402 is also making a deep ticking noise. You can only hear it when the hood is up (too quiet otherwise. The motor runs great and idles smooth. I have only had it for a couple of weeks so I have not started changing out parts to diagnose but am interested in possible causes.
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1971 Cheyenne Big Block Longhorn |
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#3 |
Registered User
![]() Join Date: May 2015
Location: Huntsville, AL
Posts: 37
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Re: Mystery engine noise, hyd. lifters? Help guys...
Mechanical fuel pump?
My antique brain sez we chased a tick over a couple of weeks (back when I was a kid) and finally discovered there was excessive clearance between the op-rod and the pump arm. As I recall, Dad had a machine-shop turn one for him that was just a little longer (or maybe he welded a button on the end and ground it to suit...I can't remember exactly). However, the tick went away.
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===Marc '55 Buick Roadmaster Riviera 76R '69 Chevy C-10 CST/10 396 LWB, auto, air, PS (PB soon!) |
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#4 |
Senior Member
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Location: Colfax-California
Posts: 8,518
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Re: Mystery engine noise, hyd. lifters? Help guys...
Are you sure it is not an exhaust leak with those headers. I had the same problem with mine and put on manifolds and a new exhaust. Quiet ever since
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#5 |
Registered User
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Location: Thousand Oaks, CA
Posts: 118
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Re: Mystery engine noise, hyd. lifters? Help guys...
Fuel pump new.
Could be a rod, I did check them all too. Clearance could be an issue...
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1967 C10: My next project 1964 SS Impala Hardtop, low and slow 2007 Harley Street Glide .... When all else fails to start. |
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#6 |
laying low
![]() Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,197
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Re: Mystery engine noise, hyd. lifters? Help guys...
Fuel pumps can make a hard pecki g sound just like a lifter. Exhaust leak real possibility too.
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#7 |
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Location: Huntsville, AL
Posts: 37
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Re: Mystery engine noise, hyd. lifters? Help guys...
Taken a stethoscope to it? Much easier to track down odd noises with one. I was taught to use an extra-long screwdriver as a stethoscope...then I bought a special one for doing engine diagnostics when I was an A&P mechanic. Long gone...need to buy a new one. On sale this week @ Harbor Freight for $3.99!
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===Marc '55 Buick Roadmaster Riviera 76R '69 Chevy C-10 CST/10 396 LWB, auto, air, PS (PB soon!) |
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#8 |
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Location: Stillwater, Oklahoma
Posts: 874
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Re: Mystery engine noise, hyd. lifters? Help guys...
Do you have a mini-starter on it? I know that me and another board member had the same problem with the gear being to close to the flywheel.
It only made noise on acceleration and declaration. It sounded like a ticking noise too.
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1971 C/10 SWB, 15x8 Rallys, 4.5" X 7" static drop, C-notched, 350/350, 3.73 Posi. .........A 383 and Gear Vendors are on my bucket list. 1972 GMC 4X4 K1500 Survivor - Sold No matter what problems life throws at you, your time on Earth can be incredibly fulfilling and rewarding.....if you just lower your expectations. -Phil Dunphy |
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#9 |
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Location: Thousand Oaks, CA
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Re: Mystery engine noise, hyd. lifters? Help guys...
Fuel pump was replaced, and I also think the sound is coming from the left bank. Or... maybe I am just closer to that side. I have no interior carpet, bare metal, sound travels easier from engine compartment.
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1967 C10: My next project 1964 SS Impala Hardtop, low and slow 2007 Harley Street Glide .... When all else fails to start. |
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#10 |
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Location: Thousand Oaks, CA
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Re: Mystery engine noise, hyd. lifters? Help guys...
I think it is a standard starter. What's a mini? Is that the induction starter? Interesting...
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1967 C10: My next project 1964 SS Impala Hardtop, low and slow 2007 Harley Street Glide .... When all else fails to start. |
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#11 | |
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Location: Stillwater, Oklahoma
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Re: Mystery engine noise, hyd. lifters? Help guys...
Quote:
It was a real head scratcher for me. I was so relieved when that's all it was. I would have sworn the sound was coming from the rear of the truck. Just goes to show that sound travels and you can't ever be sure where it's coming from.
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1971 C/10 SWB, 15x8 Rallys, 4.5" X 7" static drop, C-notched, 350/350, 3.73 Posi. .........A 383 and Gear Vendors are on my bucket list. 1972 GMC 4X4 K1500 Survivor - Sold No matter what problems life throws at you, your time on Earth can be incredibly fulfilling and rewarding.....if you just lower your expectations. -Phil Dunphy |
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#12 |
Registered User
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Location: Thousand Oaks, CA
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Re: Mystery engine noise, hyd. lifters? Help guys...
So in your case, the starter/flywheel issue would make noise while moving? Even in neutral, theoretically?
I am rarely surprised at the "what" or "causes" of issues. Many head scratchers out there. That's why we have this site. :-) Thanks!
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1967 C10: My next project 1964 SS Impala Hardtop, low and slow 2007 Harley Street Glide .... When all else fails to start. |
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#13 |
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Join Date: Mar 2015
Location: Fletcher, N.C.
Posts: 309
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Re: Mystery engine noise, hyd. lifters? Help guys...
A way to make sure it's not the fuel pump rod is start the motor then shut it off. While fuel lines are still hooked up, remove the fuel pump from the block, the rod will slide down. Then start the motor to see if you can still hear the ticking (it will run for a short time with the fuel that's left in the carb). At least this way you can eliminate the pump rod...
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#14 |
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Join Date: Jul 2010
Location: Willingboro, NJ
Posts: 489
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Re: Mystery engine noise, hyd. lifters? Help guys...
I have seen a bunch of threads on big blocks with a "ticking" noise that's been resolved to timing issues. The ticking being heard was actually pinging.
Paul
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Retired USAF - No rockets, no mortars, no bad guys shooting...No stress!!! ![]() My Build Thread: Project 72' Green http://67-72chevytrucks.com/vboard/s...d.php?t=587932 |
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#15 |
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Join Date: Dec 2012
Location: Manitoba
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Check and double check your header gaskets at the cylinder head. Mine is "ticking" as we speak and I just installed them.
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#16 |
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Join Date: Dec 2014
Location: Coal City, IL
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Re: Mystery engine noise, hyd. lifters? Help guys...
Agree with others, most of the time a ticking noise on a big block is from header gasket leaks. I never use those mr gaskets paper type gaskets. I only use metal gaskets nowadays.
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#17 |
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Location: Thousand Oaks, CA
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Re: Mystery engine noise, hyd. lifters? Help guys...
Even though I bought some custom, thick gaskets, I am leaning towards headers being warped. This is making the most sense right now. All of these suggestions are great! My Rochester Carb leaks out gas overnight, I am thinking of going electric. That might take care of the pump situation once and for all.
Thanks.
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1967 C10: My next project 1964 SS Impala Hardtop, low and slow 2007 Harley Street Glide .... When all else fails to start. |
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#18 | |
Account Suspended
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Location: Tucson
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Re: Mystery engine noise, hyd. lifters? Help guys...
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#19 | |
Registered User
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Location: Stillwater, Oklahoma
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Re: Mystery engine noise, hyd. lifters? Help guys...
Quote:
http://67-72chevytrucks.com/vboard/s....php?p=5935966
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1971 C/10 SWB, 15x8 Rallys, 4.5" X 7" static drop, C-notched, 350/350, 3.73 Posi. .........A 383 and Gear Vendors are on my bucket list. 1972 GMC 4X4 K1500 Survivor - Sold No matter what problems life throws at you, your time on Earth can be incredibly fulfilling and rewarding.....if you just lower your expectations. -Phil Dunphy |
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#20 | |
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Join Date: Feb 2011
Location: Modesto, CA
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Re: Mystery engine noise, hyd. lifters? Help guys...
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#21 |
Registered User
![]() Join Date: Apr 2012
Location: Stillwater, Oklahoma
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Re: Mystery engine noise, hyd. lifters? Help guys...
Did you ever find that noise?
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1971 C/10 SWB, 15x8 Rallys, 4.5" X 7" static drop, C-notched, 350/350, 3.73 Posi. .........A 383 and Gear Vendors are on my bucket list. 1972 GMC 4X4 K1500 Survivor - Sold No matter what problems life throws at you, your time on Earth can be incredibly fulfilling and rewarding.....if you just lower your expectations. -Phil Dunphy |
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#22 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Mystery engine noise, hyd. lifters? Help guys...
I'd get a set of the dead soft aluminium or copper exhaust gaskets can b pricy at 30-50dollars but they work better than anything else on the market
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