[Vwdiesel] Re: [Audi-VW-Diesels] RE:82 diesel vanagon passed the diesel emissions
test...
Nate Wall
nwall at opei.org
Fri Jun 14 13:43:21 EDT 2002
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[ Picked text/plain from multipart/alternative ]
<<<<<I was just looking at the engine
yesterday, listening and heard this new sound. It's a metallic kind of
pingy sound - fast ping, ping, ping, ping. I notice it at idle and it
increases with revs then goes away as the revs climb. If you had a
metal
rod and banged it on something hard the resonating noise is a similar
kind
of sound. I'm wondering what that might be. I could do with a list of
engine noises and what they all mean. I was also wondering how noisy
the
valves should be? I'm guessing a normal or slightly loose valve
clearance
is noisier than a tight one?>>>>
If its a pre-86 motor, its probally the lifters clicking (the clearance
between the cam and shim. Yes, even slightly too loose on the exhausts
cause a noticable clicking. Hydraulic heads should be quiet in this
sarea.
--Nate
jon.sykes at ps.ge.com wrote:
> Thanks to everybody who took the time to comment and respond to my
> post.
> It's great to know such a great bunch of helpful people who have a
> common
> interest.
>
> I took the van to the local car wash pressure washer yesterday. I
> used some
> diluted driveway cleaner and the tire cleaner (I think it's basically
> the
> same as engine cleaner) all over the engine and engine bay. I covered
> the
> alternator with a plastic bag and put up some plastic to protect the
> interior and cabinets as much as I could. Then I let rip. It
> actually did
> a pretty good job, getting rid of a lot of crud - especially what had
> accumulated on the metal cover below the engine.
>
> After cleaning everything off and finishing up I sat down and went to
> drive
> off. Turned the key...nothing. Turned again...nothing. Starting to
> worry
> now. 'Oh No. What have I done.' Should've kept a dirty engine that
> would
> start. Turned again...started. Joy. I'm wondering what might have
> got wet
> that prevented it starting and why it dried so quick to start 3rd
> time. If
> this happens again I'd like to know where to start troubleshooting.
>
> A couple of times over the last week I've also heard a buzzing kind of
> noise
> when I turn the key one position before actually starting the engine.
> At
> first I thought it was the fuel pump, but the fact that it doesn't do
> it
> everytime probobly means it can't be. The noise would continue for a
> few
> moments after the engine started too. I noticed it first with the
> engine
> cover off but could also detect it with the cover back on. It's a
> high
> pitch kind of buzzing noise. Anyone know what that might be? These
> intermittant problems are the worst kind to try and troubleshoot.
> Basically, I just want to be sure that I've covered the bases to make
> sure
> the van starts when I'm on a trip. I don't have the owners manual for
> my
> van and find the Bentley kind of overwhelming.
>
> Another question concerns kinds of engine noises. I know diesels are
> quite
> a bit louder mechanically than their gas counterparts, but I find
> myself
> wondering what the different noises are. I was just looking at the
> engine
> yesterday, listening and heard this new sound. It's a metallic kind
> of
> pingy sound - fast ping, ping, ping, ping. I notice it at idle and it
>
> increases with revs then goes away as the revs climb. If you had a
> metal
> rod and banged it on something hard the resonating noise is a similar
> kind
> of sound. I'm wondering what that might be. I could do with a list
> of
> engine noises and what they all mean. I was also wondering how noisy
> the
> valves should be? I'm guessing a normal or slightly loose valve
> clearance
> is noisier than a tight one?
>
> Questions, questions....
>
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