CD2, a real cure for stuck valves ?, Mazda 929
Siddharth Deliwala
noisy valves. The valve adjustment is hydraulic and so there is no
adjustment available (this is what the dealer told).
The engine has become very noisy over the time and especially when it is
cold, the valves make noise like a sewing machine !
So, I tried a few oil additives that claim to quiet the valves and the
only one that worked was CD2 Valvemedic ($2.39). I am impressed by how
much wuiet my motor is running and I was wondering if someone has a
similar experience. Does anyone know contents of CD2 ? How safe is it to
use it ?
Also, is there any other cure for bad HLA (hydraulic lash adjusters for
valves ? Thanks.
Yip Yu
Yip
kingsnake
I know this much:
CD-2 is a trade name for the 'Alemite' brand, licensed under
Stewart-Warner. It is a good product, too.
To Wit: In 1986, I had a 1972 Chevy Impala with a 400 smalll block,
which I had just purchased for $75.00. It was a little noisy in the
lifters, so, I ran TWO cans (that's what the instructions say { for
excessive valve noise or extremely dirty engines, use two cans } .
Well, sir:
I drove two miles across town, parked, did a service call, and then
headed back to the shop where I was working. I almost made it without
incident, too. Just one block away, however, I thought I had a blown
engine! The detergent had begun to do it's work: e.g., knocking down
the sludge and plugging the PCV valve and cylinder head drains.
Suction through the blow-by recycler tube soon took over, however, and
the PCV valve cleared itself in a hurry. Smoke began pouring out the
back, as this pent-up oil in the valve covers was sucked in via the
PCV. Cars approaching the intersection had to slow way down and turn
on their headlights. It scared the living hell out of me.
Yes, the stuff =really works=!
Add a can or two to your oil, drive about 30 miles, then change your
oil and filter. I swear by CD-2.
Oh, BTW: quite some time later, I sold that tuna boat for $200.00,
and the engine was still running strong.
Oh, I DID have to adjust the valve lash a little though. Even most
"self-adjusters" can be snugged down to zero-lash with the center
pivot nut. Many rockers still have to be initially torqued down to
zero lash, cold. Check your service manual. I am not familiar with
the 929's.
Ciao.
__
-John S. Bond <kingsnake> WA6FRN
Gyro Gearloose Productions ~ a website (still) in the making ~
nothing is too insane, but not everything is too wise ;->
http://www.gyrogearloose.com/ ICQ uin: 4604100
kingsnake
wrote:
>Cure for bad lifters: change them.
>
>Yip
>
If they're bad. Sometimes, you (or you) will buy a car from some idiot
who never changed his oil.
Furthermore, this WAS a question about CD-2, not bad lifters :-)
>
>
>On Tue, 8 Dec 1998, Siddharth Deliwala wrote:
>
>> I own a Mazda 929 '89 with 125K miles on it and this car is famous for its
>> noisy valves. The valve adjustment is hydraulic and so there is no
>> adjustment available (this is what the dealer told).
>> The engine has become very noisy over the time and especially when it is
>> cold, the valves make noise like a sewing machine !
>> So, I tried a few oil additives that claim to quiet the valves and the
>> only one that worked was CD2 Valvemedic ($2.39). I am impressed by how
>> much wuiet my motor is running and I was wondering if someone has a
>> similar experience. Does anyone know contents of CD2 ? How safe is it to
>> use it ?
>> Also, is there any other cure for bad HLA (hydraulic lash adjusters for
>> valves ? Thanks.
>>
>>
__
Frankj38
luck with it a fresh oil change and a can of it will do wonders on some engines
Kurt Fankhauser
: I own a Mazda 929 '89 with 125K miles on it and this car is famous for its
: noisy valves. The valve adjustment is hydraulic and so there is no
: adjustment available (this is what the dealer told).
: The engine has become very noisy over the time and especially when it is
: cold, the valves make noise like a sewing machine !
: So, I tried a few oil additives that claim to quiet the valves and the
: only one that worked was CD2 Valvemedic ($2.39). I am impressed by how
: much wuiet my motor is running and I was wondering if someone has a
: similar experience. Does anyone know contents of CD2 ? How safe is it to
: use it ?
: Also, is there any other cure for bad HLA (hydraulic lash adjusters for
: valves ? Thanks.
I had similar problems with my 1990 MX-6. Had lifter noise beginning around
50K. At 100K it became unbearable. I finally found out how to check the
HLAs from the Workshop manual and replaced one that had considerable gap
between it and the valve stem. The motor ran quiet for about 2 weeks then
the noise started coming back. I removed the valve cover and found that
there was a gap on the same HLA. After reading this thread I tried a can of
CD-2 Oil Detergent. The noise is completely gone!
BTW, CD-2 is its own company. Valvemedic is a separate product from GUNK.
Kurt Fankhauser <kf...@pacifier.com>