This'll be fun to listen to...
Gary,
How many miles on the engine? You could try a tune up... plugs, points, etc.
and check the timing. And an oil change with good oil.
I'll assume you know what a rod and main knock sound like, and what a wrist
pin knock sounds like (much higher pitched...)
You can probably eliminate for the moment piston slap; that normally happens
when the engine is cold.
Assuming that you do, what's left in the engine? Lifters, sticky valves.
valve springs. Maybe spark knock if the fuel is really old or the timing's
out.
First suggestion, drive the car without over-reving it. Maybe an easy fifty
MPH or so (around 2,000 rpm if you have close to stock tires on it... the
diameter's the thing... @ 23 - 24"). See if it "ticks" at you when the
engine's good and warm. If it does, try and locate the cylinder with a
stethascope (or long screwdriver, but be safe!)
If it doesn't, recreate the noise at higher revs and try to isolate it.
If it's a lifter, any good oil additive (except STP... too darn thick!) may
help. STP gas treatment, Wynns, Bardahl (I'm showing my age; are they still
around?). Maybe some Marvel Mystery Oil added to the oil on the next change.
The point is first you have to isolate it. Frequently that's not an easy
thing to do.
Good hunting.
Tom
On Fri, Apr 16, 2010 at 4:20 PM, Pointers <gpointer@telusplanet.net> wrote:
> Listers with engine experience, pls weigh in. Have been following and
> benefited tremendously from this list for a decade...now I need you guys to
> come thru in spades, or it'll be a long summer!
>
> Near the end of a morning outing where I was just warming up the oil for
> changing, running it up to 60 MPH on hard acceleration (not high revs),
> thought I heard something ticking at the stop light. When back home, sure
> enough, there was a tick/knock coming from the passenger bank. Best I can
> describe is not a real tick, but not a solid bottom end knock either.
> Something in-between that, mid-block (if I'm making any sense), quite
> audible.
> Anyhow, parked it while I sought advice and searched the net. Got varied
> info.
> Summer ended (Canada). Was going to trailer it to storage (`10 miles), but
> thought I'd fire it up, and low and behold, no noise! None whatsoever.
> After
> about 5 miles, no prob, so applied full throttle to 60 MPH, and the exact
> same
> noise was present again.
>
> Time to park the dog sled team, fetch the car from storage and tackle the
> issue. All suggestions appreciated. The winning recommendation gets to
> share
> the bill! (My wish is for a simple remedy...engine cleaner oil
> additive...that
> sort of thing. Anything requiring more time + $ may not get done soon).
>
> Engine = 302 with stock internals.
>
> Gary Pointer
> St. Albert, Alberta
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