Re: TECH:Trying to confirm rod knock

["Curt Voss" <curtv@eudoramail.com>]

Chris - if it's a main bearing you need to at least put in a crankshaft kit (reground crank + bearings) - which means pulling the motor - or maybe drop another motor. But, if you're not noticing a drop in oil pressure or a loud knock when you first start the car, then that points away from the bearings. I'm wondering about a wristpin, that seems to fit all the symptoms.

What I'd suggest is: if you haven't already, do the plug wire test by pulling the wires one at a time and revving the motor. If the knock quiets down or goes away when one particular wire is removed then it's either the wristpin or the rod bearing on that cylinder, or a main bearing adjacent to it. You can further check the #2-3-4 main bearings by pulling two adjacent wires, for instance if the knock gets quieter when you pull #1 or #2 and even quieter when you pull both together, then it points to the #2 main bearing (between cylinders 1 & 2).

When you pulled the oil pan did you check for metal flakes in the bottom and in the oil pump strainer? If it's a wristpin, you should find the circlip laying in the oil pan too.


On Mon, 22 Oct 2001 23:08:57   chris gonzalez wrote:
>> could be something else entirely. Does it get louder under load? Do
>yes.
>
>> you have an oil pressure gauge and if so has the pressure dropped?
>oil pressure gauge shows no drop in pressure.
>
>if it is a main bearing, what are my options? 
>
>thanks for you input,
>chrisg
>'82 8v 
>'88 16v
>
>--- Curt Voss <curtv@eudoramail.com> wrote:
>> In my experience a worn rod bearing always knocks loudest in the
>> first few seconds after you start the car until oil pressure builds
>> up, so it doesn't sound like a rod to me. Maybe a main bearing, or it
>> could be something else entirely. Does it get louder under load? Do
>> you have an oil pressure gauge and if so has the pressure dropped?
>> 
>> ---
>> '86 Scirocco 8V, soon to be sold
>> '82 Scirocco 1.8 8v - the daily driver
>> '81 Caddy
>> '78 Rabbit 1.7L rustbucket in semi-retirement
>> '86 Celica GTS
>> '02 PT Cruiser - the wife's boat
>> 
>> On Mon, 22 Oct 2001 22:31:19   chris gonzalez wrote:
>> >the patient: 88 cabriolet 1.8 8v (all stock).
>> >the symptoms: start the car and everything sounds fine at idle.
>> slight
>> >ticking from the hydraulic lifters, but nothing out of the ordinary.
>> >rev the car, and it still sounds normal. get it and drive the car up
>> >the block still normal for about 1/2 mile, then a dull knock knock
>> >knock that varies with engine speed. used a mechanics stethoscope
>> and
>> >the sound is apparently coming from the vicinity of the oil pan/
>> >automatic transmission.
>> >
>> >I pulled off the oil pan and could not see anything out of the
>> ordinary
>> >(with my untrained eye, that is). connecting rod bolts are all
>> there,
>> >and torqued, at least...
>> >
>> >Should I go further and pull of the rod bearing caps and inspect the
>> >crankshaft? I figure if a rod is knocking it's "gonna leave a mark."
>> >Has anyone used the "ground out the spark wire trick"? 
>> >
>> >Or could it be entirely something else? 
>> >
>> >TIA,
>> >chrisg
>> >'82 8v
>> >'88 16v
>> >
>> >
>> >
>> >
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