rolly850R Posted September 5, 2005 Report Share Posted September 5, 2005 Well,This was discovered whilst I was checking the engine mounts, looking for a cause of a vibration at low load at standstill (Sitting in D or AC turned on).Can someone confirm what I'm thinking, should there not be a bolt in this hole to fasten the trans to the engine?Thanks in advanceSimon Link to comment Share on other sites More sharing options...
Bay13 Posted September 5, 2005 Report Share Posted September 5, 2005 Yes you are missing a bolt there. The head on the bolt is 14mm not sure how long or the thread size, but if you follow from the missing bolt and down there are two more bolts holding the brace to the trans, on one end and the other end bolts to the subframe, that is the exact size of the bolt thats missing. Take one of those out and use it to find another one like it. Link to comment Share on other sites More sharing options...
prasamin Posted September 5, 2005 Report Share Posted September 5, 2005 Yes you are missing a bolt there. The head on the bolt is 14mm not sure how long or the thread size, but if you follow from the missing bolt and down there are two more bolts holding the brace to the trans, on one end and the other end bolts to the subframe, that is the exact size of the bolt thats missing. Take one of those out and use it to find another one like it.←Rich, could that one missing bolt cause that bad a vibration? shouldn't he check the motor mounts under there? or the bushing up top? Link to comment Share on other sites More sharing options...
Bay13 Posted September 5, 2005 Report Share Posted September 5, 2005 Ya the missing bolt has nothing to do with his problem. And he should check the motor mounts and upper torque bushing. You could hold the transmission up to the engine with half the bolts that are there and more than likely nothing would happen, it certianly has nothing to do with vibration.PS Looks like the turbo return line is seeping as well.(assuming it's a turbo, if it's not, look up further to find the leak.http://www.volvospeed.com/Repair/turborepairline.phphttp://www.volvospeed.com/Repair/front_mount.php Link to comment Share on other sites More sharing options...
rolly850R Posted September 5, 2005 Author Report Share Posted September 5, 2005 Thanks Guys,I will look into it more this weekend. I know the upper tourque bushing is good, I checked it before I bought the car.Yeah its a turbo, so thanks Rich, I'll look into the turbo return line further (I do loose a litle bit of oil, but very little. The oil stain could be from the oil filler cap which was replaced prior to me purchasing the car.. there was oil everywhere.This place rocks for knowledge - I wonder why............. :) Link to comment Share on other sites More sharing options...
Bay13 Posted September 5, 2005 Report Share Posted September 5, 2005 When they give us the stupid pill at the clinic, we just keep them under our tongues and once we get outside we spit them out and the birds eat them. :P Link to comment Share on other sites More sharing options...
rolly850R Posted September 6, 2005 Author Report Share Posted September 6, 2005 As long as you keep spitting them out Rich, it's fine by me :D Link to comment Share on other sites More sharing options...
rolly850R Posted September 13, 2005 Author Report Share Posted September 13, 2005 UPDATE:Rich, you were wrong, so very wrong. All the engine mounts are fine, so hahahaha.It was in actual fact the AC compressor so there! Hang on a tick That's going to cost me even more to fix than an engine mount Doh!!On a serious note, thanks for all the help Rich and Co. and I will look into the oil return line I promise.For those that want to know - I used the old screwdriver technique to find where the vibration was coming from - None what so ever coming through the sub frame, and very small amount form the top of the motor - move to the alternator - hmm that's vibrating a bit....... On down to the compressor - HELLO!! Then tested it with the AC on - Blimey!!!!!!!!It has been confirmed by an AC specialist to be the bearing in the compressor and low gas level - getting fixed tomorrow. :D Link to comment Share on other sites More sharing options...
Bay13 Posted September 13, 2005 Report Share Posted September 13, 2005 So when going slow with the A/C on you have the vibration, without the A/C it goes away. OK I change my guess to the compressor. :P Link to comment Share on other sites More sharing options...
rolly850R Posted September 13, 2005 Author Report Share Posted September 13, 2005 So when going slow with the A/C on you have the vibration, without the A/C it goes away. OK I change my guess to the compressor. ←The vibration is still there sitting still and the AC off - it just gets worse either with putting it in gear or turning on the AC, and worse again being in gear with the AC on and standing still.It must be a load/RPM thing that lets the bearing shake more. I did also notice that the tensioner vibrates too, hopefully this will go away with a nice shiny (and lubricated) bearing in the compressor.The AC guy showed me the temp going into the compressor was 16 degC - should be between 3 and 6 deg C. Each 5 deg C represents a 100 deg C increase in temperature in the compressor. so it is currently working with an extra 200 degC - I wonder why the bearing is stuffed edit - man I can't spell - sorry Link to comment Share on other sites More sharing options...
Bay13 Posted September 13, 2005 Report Share Posted September 13, 2005 Ok now you got me asking questions. How is changing the compressor going to effect the input temp to the compressor? The input to the compressor is vapor from the evaporator via the accumulator.http://www.volvospeed.com/Repair/ac.phpDon't get me wrong, you could have a bad compressor.Another thing, if you have the vibration with the A/C off(in drive), then the compressor is not engaged, so the source of your vibration isn't the bearing in the compressor. The compressor might make it worse because of the loading, but the compressor isn't the root cause of your vibration. Link to comment Share on other sites More sharing options...
rolly850R Posted September 13, 2005 Author Report Share Posted September 13, 2005 It's the low gas level that is the cause of the higher temp yes/no? It's what I was told anywhoThis has in turn stuffed the bearing in the compressor.The wheel on the drive belt doesn't stop spining when the AC is off, and I don't think that shaft that the drive pulley is mounted to spins in mid air, it's got to be spinning in something surely? Like a bearing? (Ive never pulled one of these puppies apart - many things yes, but not an AC compressor)When the AC is turned on the clutch in the compressor is engaged putting more load on the bearing.We will soon see - the AC guy is fixing whatever is nesc, and he has assured me that the evap. will not need replacing - phew.AC is all this guy does - so he knows more than me. Been doing it for 30+ years.I'll let you know what was done Link to comment Share on other sites More sharing options...
Bay13 Posted September 13, 2005 Report Share Posted September 13, 2005 AC is all this guy doesAnd my questions are more to learn as well, please keep us up updated. Link to comment Share on other sites More sharing options...
rolly850R Posted September 14, 2005 Author Report Share Posted September 14, 2005 Well....One part of the story ends, another begins. The bearing has now been replaced and now delivers quiet AC operation. Turns out that the compressor was a 2nd hand jobbie.That low speed vibration still exists in P and D there is another vibration eminating from the compressor.Rich, I think I can see where you are coming from, the clutch is actaully part of the drive pully yes?also there is now a hissing noise from the AC system after the car is shutdown. grrrrrrrIts going back!edited after further mucking about Link to comment Share on other sites More sharing options...
Bay13 Posted September 14, 2005 Report Share Posted September 14, 2005 Rich, I think I can see where you are coming from, the clutch is actaully part of the drive pully yes?Yes the clutch has the drive pulley. If the clutch is not engaged then the compressor is not turned, just the pulley will turn/freewheel. Link to comment Share on other sites More sharing options...
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