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Noisey hydraulic tappet.



 
 
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  #1  
Old December 1st 06, 12:30 AM posted to alt.autos.bmw
Jeff Strickland[_1_]
external usenet poster
 
Posts: 419
Default Noisey hydraulic tappet.

There is no rush on this job. Tappets can make nosie for years and years.

Having said that, I can't hear your tappets, and it is possible that there
is danger of them colapsing entirely, in which case the valve in question
would not open fully. I see no point in rushing into anything here. I'd try
some Marvel Mystery Oil before I twisted a single bolt. Back in the olden
days, we would pour automatic transmission fluid into the crankcase to free
up a sticky lifter.

Hydraulic lifters have tiny orifices in them that are prone to clogging due
to a collection of tarnish. They also have some moving parts that can get
sticky from the same tarnish. When this happens, the lifter sticks in a
slightly colapsed condition, and this makes the noise you are hearing.
Tarnish is generally a function of leaving the oil in the motor for too
long, but it can also come about as a result of short trips where the oil
does not heat up well before the motor is shut down again. Automatic
Transmission Fluid is HIGHLY detergent, and it has been used to cut the
tarnish that is making the valve lifters noisey. One of the downsides of ATF
is that it will dry the rubber seals, and this might result in some slight
leakage to the outside of the motor.

I'd suggest that you add somewhere between a pint and a quart of ATF to the
crankcase, then change the oil in 1500 to 2000 miles. Obvioulsy, you would
prefer to not overfill the crankcase, so you may need to drain a bit of oil
before you go about adding ATF.





> wrote in message
...
> My 2000 540 is starting to make a nasty noise starting. It is an M62
> engine and it has done 67K miles. The noise is coming from the left
> bank of cylinders looking from the drivers seat and it is a right hand
> drive car. The mech hasn't done one before but has done 6 cylinder
> models. Have I got to have all the tappets replaced on the left bank
> of cylinders? How many hydraulic tappets are there per this engine? Is
> this going to be very expensive?
> pete
> --
> http://www.brazierbridgewood.blogspot.com/
> http://www.flickr.com/photos/ipswich/


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  #2  
Old December 1st 06, 01:25 AM posted to alt.autos.bmw
Jeff Strickland[_1_]
external usenet poster
 
Posts: 419
Default Noisey hydraulic tappet.


> wrote in message
...
> On Thu, 30 Nov 2006 15:30:54 -0800, "Jeff Strickland"
> > wrote:
>
>>There is no rush on this job. Tappets can make nosie for years and years.
>>
>>Having said that, I can't hear your tappets, and it is possible that there
>>is danger of them colapsing entirely, in which case the valve in question
>>would not open fully. I see no point in rushing into anything here. I'd
>>try
>>some Marvel Mystery Oil before I twisted a single bolt. Back in the olden
>>days, we would pour automatic transmission fluid into the crankcase to
>>free
>>up a sticky lifter.
>>
>>Hydraulic lifters have tiny orifices in them that are prone to clogging
>>due
>>to a collection of tarnish. They also have some moving parts that can get
>>sticky from the same tarnish. When this happens, the lifter sticks in a
>>slightly colapsed condition, and this makes the noise you are hearing.
>>Tarnish is generally a function of leaving the oil in the motor for too
>>long, but it can also come about as a result of short trips where the oil
>>does not heat up well before the motor is shut down again. Automatic
>>Transmission Fluid is HIGHLY detergent, and it has been used to cut the
>>tarnish that is making the valve lifters noisey. One of the downsides of
>>ATF
>>is that it will dry the rubber seals, and this might result in some slight
>>leakage to the outside of the motor.
>>
>>I'd suggest that you add somewhere between a pint and a quart of ATF to
>>the
>>crankcase, then change the oil in 1500 to 2000 miles. Obvioulsy, you would
>>prefer to not overfill the crankcase, so you may need to drain a bit of
>>oil
>>before you go about adding ATF.

>
> I have had this car 8 months and noticed the noise 4-5 months ago when
> the car was ticking over and I was inside it. It is not immediately
> obvious when outside the car. Your tip of using ATF is a new one on me
> and sounds good but I have decided to get it done unless I can find
> another car quickly. How many tappets have I got with this engine?
> Have all got to be replaced or will the collapsed one show when the
> valve cover is removed?
> pete
> --


I've had cars that made tappet noise for as long as I owned them.

I'm not sure how many you have, but you have one for each valve. If the
noise is there for start up, then goes away within a few seconds, you're
wasting money on the repairs. If you don't care about wasting money, I'm
suitable for adoption and I have a Jeep that could use some of your money --
I mean, love. ;-)

Your car has only 67,000 miles and you're gonna get a new one because the
tappets make noise? That's akin to trading your car in because the tires are
worn out. I do not recall what year you said your car is, but you can easily
take your time in looking for a replacement. Now, if your tappet noise does
not subside within a matter of about 15 seconds, then there is cause for
concern. But, if the noise goes away in 5 seconds, then all you have is a
tappet (or two) that drain the oil while the car sits, and it takes a few
seconds to get the oil back in them. Seriously, if I was your mechanic, I'd
shoot myself in the foot and tell you to not have this kind of noise
repaired. There is no guaranty that the new tappets won't behave the same
way in a year or so, or in a week.



> http://www.brazierbridgewood.blogspot.com/
> http://www.flickr.com/photos/ipswich/


 




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