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  1. #1
    Join Date
    Feb 2014
    Posts
    77

    Default help with clicking diagnosis

    I wasn't quite sure where to post this question, so I thought I'd start here. The wagon (1970 Estate, 455) started making a noise about a week ago, and I'm having some trouble finding the source. I thought someone here might have some ideas.

    Here's what I know about the noise:

    • the noise is a clicking sound
    • the noise is intermittent: some trips it doesn't start at all, but once it starts on any given trip it doesn't stop
    • if the noise starts, it starts when the engine is warm, usually at 60+mph
    • the clicking speeds up/slows down with the gas pedal. this is true whether the car is in drive or neutral
    • sound seems to be coming from the front right of the engine.


    Here's what I have checked so far:
    • I have revved the engine in neutral. The clicking accelerated just as it did when I was on the freeway.
    • Checked the fan for wobble. It doesn't have excessive lateral play.
    • Checked the belts. No visible deterioration, tension is good.
    • I don't have a stethoscope, but I used a dowel to listen to the A/C compressor and alternator. Didn't hear anything remarkable.


    So there you go. Be glad for any thoughts. What else should I check (or re-check)?

    Thanks,
    Matt
    1970 Buick Estate Wagon, 455

  2. #2
    Join Date
    Feb 2002
    Location
    LI,NY
    Posts
    19,843

    Default Re: help with clicking diagnosis

    Are you sure it isn't a small exhaust leak? They tend to sound like that. If your sure that's not it, I'd probably take all the belts off one by one and see if that effects anything.
    Jason Cook
    BPG #1675
    "Expert in obsolete technology"

    1968 Riviera GS- some assembly required
    1969 Riviera GS- my first car
    1969 GS-350
    1970 Stage 1 4 speed Aquamist
    1970 GS-455 Bamboo Cream beater
    1971 GS 455 11.93@113.36
    1972 GS-350
    1970 Stellar Industries vintage go kart

    Deo duce, ferro comitante

  3. #3
    Join Date
    Jan 2015
    Location
    Behind the Steel Curtain ,North East
    Posts
    770

    Default Re: help with clicking diagnosis

    I would change the oil with 10w40 with zddp additive it could one of 16 little soldiers fighting to keep his pressure from dropping while he pushes that rod all day
    Bill
    68 # matching
    72 vert gs clone
    80 turbo trans am /33 years owned
    74 olds 98R 2dht ACRS 20k A title
    85 chevy Silverado K10 lifted/frame off resto
    79 chevy Scottsdale k10 327 plow tk

  4. #4
    Join Date
    Feb 2002
    Location
    LI,NY
    Posts
    19,843

    Default Re: help with clicking diagnosis

    Quote Originally Posted by jalopi42 View Post
    I would change the oil with 10w40 with zddp additive it could one of 16 little soldiers fighting to keep his pressure from dropping while he pushes that rod all day
    A little Marvel Mystery oil wouldn't hurt either if that's the case
    Jason Cook
    BPG #1675
    "Expert in obsolete technology"

    1968 Riviera GS- some assembly required
    1969 Riviera GS- my first car
    1969 GS-350
    1970 Stage 1 4 speed Aquamist
    1970 GS-455 Bamboo Cream beater
    1971 GS 455 11.93@113.36
    1972 GS-350
    1970 Stellar Industries vintage go kart

    Deo duce, ferro comitante

  5. #5
    Join Date
    Apr 2004
    Location
    Puxico, MO (at Duck Creek)
    Posts
    1,402

    Default Re: help with clicking diagnosis

    Use a 2-3 foot pipe, hose, or tubing to listen for noise. Move it along the exhaust gaskets, valve covers, external moving parts, etc. Remove the oil filler cap, valve cover vent tube, pcv valve, and put tube part way inside the engine.
    The tubular device really picks up noise when you approach the right spot.
    GSCA # 116
    67 GS 455

  6. #6
    Join Date
    Apr 2004
    Location
    Puxico, MO (at Duck Creek)
    Posts
    1,402

    Default Re: help with clicking diagnosis

    Oh, just remembered, the pin that holds the lever that lifts the rear metering rods of my qjet, worked its way loose and fell into the intake and caused a clicking noise. Anyway, it eventually cleared up on it's own, but left its mark on a piston. It probably exited an exhaust port at about 5800 rpm. Found the evidence years later during a refresh of rings and bearings.
    Any object on a piston can move around, come and go.
    Years ago a young fellow "overhauled" his engine and it knocked like a rod on startup. I noticed it came from the passenger side. Everyone was saying "you phucked up"! Because of its noise location, I told him to just take that head off and look into the bores for a "washer" or other small object. Next day he ran toward me holding up a washer between his fingers. No harm done. He was one happy guy.

    Meanwhile, back at the ranch...sometimes a tube works better than a stethoscope to locate problems.
    GSCA # 116
    67 GS 455

  7. #7
    Join Date
    Feb 2014
    Posts
    77

    Default Re: help with clicking diagnosis

    Thanks Jason, Bill, and Gary for the ideas. I'll do some more poking around and get back with you. It may not be fast though, since there are two toddlers and a full-blown remodel to contend with as well.
    1970 Buick Estate Wagon, 455

 

 

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