[whakiewes]

I changed my oil on Saturday night, new filter, ~7 quarts of oil to full, now about 1/4 down on the dipstick which I consider normal for it to refill the system. Fine that night, fine on Sunday morning. Then leaving work Sunday evening I heard the ever so slightest knock. Sounds more like alternator bearings or something, but when I use a stethoscope it sounds like its near the head. I say sound like because this is a loud engine internally, and everything is jumbled together. I am going to pull my plugs under Lemmings post, check compression/leakdown, and retest. Oil pressure is perfect, no knock under an accelleration...in fact its not evident if I rev the engine to say 1500rpms from under the hood. I am dumbfounded. It actually sounds as if it might be the balance shaft area. Very hard to tell. Any suggestions or ideas before I pull the pan like Lemming did? 162k miles, 19k on all belts, no records of variocam parts replaced. I have been having a whine from the variocam area since right after I bought the car...still there, but also where the knock appears to be comming from.



Thanks,



Wes

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[flash]

you would be amazed at how loud and obnoxious the lifters on these things can be



also, the timing cover can be known to get loose and make a racket

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[frank moran]

[quote name='whakiewes' date='May 29 2006, 12:32 PM']I changed my oil on Saturday night, new filter, ~7 quarts of oil to full, now about 1/4 down on the dipstick which I consider normal for it to refill the system.  Fine that night, fine on Sunday morning.  Then leaving work Sunday evening I heard the ever so slightest knock.  Sounds more like alternator bearings or something, but when I use a stethoscope it sounds like its near the head.  I say sound like because this is a loud engine internally, and everything is jumbled together.  I am going to pull my plugs under Lemmings post, check compression/leakdown, and retest.  Oil pressure is perfect, no knock under an accelleration...in fact its not evident if I rev the engine to say 1500rpms from under the hood.  I am dumbfounded.  It actually sounds as if it might be the balance shaft area.  Very hard to tell.  Any suggestions or ideas before I pull the pan like Lemming did?  162k miles, 19k on all belts, no records of variocam parts replaced.  I have been having a whine from the variocam area since right after I bought the car...still there, but also where the knock appears to be comming from.



Thanks,



Wes

[right][post="21981"]<{POST_SNAPBACK}>[/post][/right][/quote]

just a thought, could it be the T belt tensioner lost it's charge and the tensioner arm is bouncing around a little bit.. I experiened this on a Rodeo once, just a thought.

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[whakiewes]

I am going to take it in tomorrow. I called my mechanic who's been building Porsche engines for many many years and this was his suggestion -



I noted that I had just changed my oil, and he asked how my previous oil looked. I suggested that the PO told me around 2000 miles prior to my ownership, and I drove about 1800, so 3800 total. High but not life threatening. I told him it was thick and black, similar to oils I have seen closer to 6-8k miles. Regardless he said that it wouldn't cause an engine to blow, just gunk up. BUT, at 162k miles, he's only touched one other 968 on a stock bearing set with higher mileage. So he suggested is not a spun rod bearing, but a warn out bearing or several. This was muffled by the super thick old oil which is now new. Even though its not listed under Porsche scheduled maintanence, he always suggests changing the bearings on all M42/44 series engines at 100k miles.



Noise is definantly from the engine, not the front parts as best as I can tell. Below intake manifold, loud at the head and more audible in the cabin than outside makes him think that the engine is just worn out.



Someone pray for me! <img src="/forum/images/smilies/968/smile.gif" class="smilie" alt="" /> Haha



Wes

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[Mikeoupe]

[quote name='whakiewes' date='May 29 2006, 05:32 PM']I changed my oil on Saturday night, new filter, ~7 quarts of oil to full, now about 1/4 down on the dipstick which I consider normal for it to refill the system.  Fine that night, fine on Sunday morning.  Then leaving work Sunday evening I heard the ever so slightest knock.  Sounds more like alternator bearings or something, but when I use a stethoscope it sounds like its near the head.  I say sound like because this is a loud engine internally, and everything is jumbled together.  I am going to pull my plugs under Lemmings post, check compression/leakdown, and retest.  Oil pressure is perfect, no knock under an accelleration...in fact its not evident if I rev the engine to say 1500rpms from under the hood.  I am dumbfounded.  It actually sounds as if it might be the balance shaft area.  Very hard to tell.  Any suggestions or ideas before I pull the pan like Lemming did?  162k miles, 19k on all belts, no records of variocam parts replaced.  I have been having a whine from the variocam area since right after I bought the car...still there, but also where the knock appears to be comming from.



Thanks,



Wes

[right][post="21981"]<{POST_SNAPBACK}>[/post][/right][/quote]



Wes,



I know this is an old thread so sorry for dragging it back up but did you ever get to the bottom of this? I ask as I've just experienced something very similar. I did an oil change and now when starting the car from cold I have an intermittent rattle that simply wasn't there before, it's only from cold and lasts for a couple of minutes.



Thanks

Mike

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[whakiewes]

[quote name='Mikeoupe' date='Sep 14 2006, 06:51 PM']Wes,



I know this is an old thread so sorry for dragging it back up but did you ever get to the bottom of this? I ask as I've just experienced something very similar. I did an oil change and now when starting the car from cold I have an intermittent rattle that simply wasn't there before, it's only from cold and lasts for a couple of minutes.



Thanks

Mike

[right][post="26118"]<{POST_SNAPBACK}>[/post][/right][/quote]



Mike,



Its cool man. It just went away after a couple hundred miles. It drove me nuts, but then just stopped. I have since done one other oil change. The first one I did pretty hot, so I am sure a lot was drained. This time I did a cool-luke warm change, and it wasn't present. I think its just noisy lifters. Now I have other noises since adding the exhaust, but I am fairly confident I just didn't get the O-Ring inbetween pipes put in correctly. Sorry I can't be of any other help. If it matters any though, all those pesky noises in the engine go away when you do the airbox/chip/exhaust mod plan <img src="/forum/images/smilies/968/smile.gif" class="smilie" alt="" /> .



Wes

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