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Car Forum / BMW Cars / December 2006Noisey hydraulic tappet.
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/ 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. > 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 [quoted text clipped - 7 lines] > http://www.brazierbridgewood.blogspot.com/ > http://www.flickr.com/photos/ipswich/ >There is no rush on this job. Tappets can make nosie for years and years. > [quoted text clipped - 21 lines] >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 -- http://www.brazierbridgewood.blogspot.com/ http://www.flickr.com/photos/ipswich/ >>There is no rush on this job. Tappets can make nosie for years and years. >> [quoted text clipped - 37 lines] > 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/ >> 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 [quoted text clipped - 7 lines] > >I've had cars that made tappet noise for as long as I owned them. Yes but this one has become more noisy in a few months. >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. ;-) It has 32 valves but is it one tappet for each pair of valves? >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 [quoted text clipped - 7 lines] >repaired. There is no guaranty that the new tappets won't behave the same >way in a year or so, or in a week. If it was only noisy for a second upon start up I wouldn't bother but it is noisy on tick over too so I think it could be failing to hold oil at tick over or just stuck. It cannot be heard if revved but that is probably because it is making too much noise from the fan etc to hear it. I am thinking if it was just stuck then it would not have got noisier. I have done about 15K of the 67K miles the car has done. pete -- http://www.brazierbridgewood.blogspot.com/ http://www.flickr.com/photos/ipswich/ > 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 [quoted text clipped - 7 lines] > http://www.brazierbridgewood.blogspot.com/ > http://www.flickr.com/photos/ipswich/ As the car gets older the hydraulic tappets wear. This allows the oil to run out of the tappet(s) when the car is standing. When an older car is restarted after a long time standing it is normal to hear quite a bit of tappet noise until they pump themselves up again (usually a minute or two). In the mean time don't thrash it, although this is good advice for any cold engine. If the noise is constant then one or more of them may be stuck. Try thinner or thicker oil (ask mechanic). It may be possible to just remove the crankshaft cover(s) to inspect, manipulate or replace the tappets. I would not consider undoing the head unless the problem was really bad AND your mechanic knows what he is doing - you need new bolts, gaskets, run in etc. if you do this and it will cost £££. Consider the possibility of looseness of the cam chain. How sure are you about the mileage? >> 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 [quoted text clipped - 3 lines] >> of cylinders? How many hydraulic tappets are there per this engine? Is >> this going to be very expensive? >As the car gets older the hydraulic tappets wear. This allows the oil to >run out of the tappet(s) when the car is standing. [quoted text clipped - 14 lines] > >How sure are you about the mileage? As sure as possible but why would the crankcase of cylinder head need touching? Am I missing something? pete -- http://www.brazierbridgewood.blogspot.com/ http://www.flickr.com/photos/ipswich/ > As sure as possible but why would the crankcase of cylinder head need > touching? Am I missing something? > pete > > -- I'm sure he means cam cover. There is a TSB about tappets sticking on ther V8s if they've been left for a while. Mine took a logn trip to quieten down. Ona 6 cyl I had I found that the oil I used made a big difference. >> As sure as possible but why would the crankcase or cylinder head need >> touching? Am I missing something? [quoted text clipped - 6 lines] >quieten down. Ona 6 cyl I had I found that the oil I used made a big >difference. Yes of course. The cam cover would make sense. My mech has booked the car in for January 4th but he reckons it will clear up itself. He reckons that as the car was bought from a dealer it is possible the oil was of the wrong grade or even the indicator could have been re-set without even having an oil change. He has recently serviced my motor and used BMW oil and he says I should allow it to attack any gunge that maye sticking the tappets before jumping into a tappet replacement job so I am just hoping he is right. pete -- http://www.brazierbridgewood.blogspot.com/ http://www.flickr.com/photos/ipswich/ |
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