Bruce,
More info: when did this knocking start? had you just changed or had the belt
changed? or had other work on the engine?
A rough thought I had was, if it just had a timing belt job done and they did
the water pump, maybe one of the cam pulleys wasn't tightened down or seated
back on the pin.
Also check the water pump pulley itself (belt pulley); I've seen people not
tighten those down and they knock. (not too tight tho, they're small bolts; I
forget the spec, but it's inch pounds)
Ross Kuhns
From: [email protected]
To: [email protected]; [email protected]
Subject: RE: noise at valve cover front right
Date: Tue, 18 May 2010 19:47:14 +0100
Similar location to the noise mine made when the crankshaft pulley key had
sheared - is there any visible wobble on the pulley at idle, and can you feel a
knocking through the gear level?
Glenn
From: [email protected]
[mailto:[email protected]] On Behalf Of Bruce Andrews
Sent: 18 May 2010 17:54
To: [email protected]
Subject: noise at valve cover front right
have a 94 M Edition MX5 Miata. It has 125K on it. I have developed a knocking
noise that is loudest at the front right (as standing in front) valve / timing
belt cover. I have listened all over the engine and can hear all the bearings,
they sound normal. I thought it might be the timing belt, as I do not know when
it was changed last. After pulling the valve cover, front covers. I found the
timing belt looks good. The middle cover was not installed correct and had been
rubbing on the timing belt (no damage to the belt and just marks on the cover).
I checked the tension /idler bearings and they appear to be fairly new. The
spring seams to be weak as when I went to retention the belt it was not to
specifications. After using my padded pry bar to gently persuade the tension
farther. I got it within specks at the end of the tension travel.
Is this normal on this engine? Does this indicate the timing belt needs to be
replaced?
Thank You
Bruce
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