M42club.com - Home of the BMW E30/E36 318i/iS
DISCUSSION => Engine + Driveline => Topic started by: alex230ro on August 07, 2020, 09:53:47 AM
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This appeared few weeks ago after the car warms up it disappears, but it begin to sound louder , so i've stopped driving the car. All chain guides and chain tensioner were changed few years ago .
https://flic.kr/p/2jtSpGc
Any thoughts?
thanks
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It sounds like a tapping or rattling of something metallic to me. If it is getting louder, then something must be loosening or continuing to break.
Try checking these things:
- Engine fan catching on something
- V-belt tensioners are loose
- Perceptible radial or axial play in any of the things driven by the V-belts (checked with belts off)
When you changed the chain guides, did you do the long one on the driver's side, and when you did it did you replace the old metal+rubber one with the newer plastic+rubber one? The old one used a 40mm M6 bolt, and the new style one uses a 45mm bolt, and sometimes if you reuse the old one it will strip out of the head and rattle against the upper timing cover.
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Hello, new style guide plastic_ rubber was used but with old style bolt 40mm .Engine fan is ok , will check the v belts tensioner . Thanks
Also the sound dissapears when i rev the engine or if the engine gets in operating temperature
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update, i have taken out the cam cover, chains looks good, with a help from a neighbour looks like we have found the source :
https://www.realoem.com/bmw/enUS/showparts?id=AF93-USA-01-1990-E30-BMW-318is&diagId=13_0309
looks like the throttle body flaps has a play , i will try to make a video, is a very strange thing
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Interesting. Is it the circular throttle plate that is vibrating, or the external linkage?
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Looks that is the circular internal plate, play is also visible from the external linkage.
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Strange. Did the torsion spring break? There should not be any play in the throttle linkage if the spring is still in one piece (well, 2 springs actually, you can inspect them easily since they are on the outside).
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Hello , i will check if i take this as a reference https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m42/364746-m42-throttle-body-disassembly https://imgur.com/a/C7OM4 i may have a problem with the spring, i will try to reposition and check.
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Update, i've tried yesterday to check again the throttle but i didn't make any progress , starting the car with no intake boot requires 2 persons and i was alone, now it idle's very poor and i think that playing with the throttle i've messed up the TPS.
here is the movie
https://flic.kr/p/2jvB3dx
https://flic.kr/p/2jvx6DV
i'm out off ideas for now :(
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If the intake boot was removed and after you have bad idle, check for any vacuum leaks. something might not be sealed correctly.
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i will check again, today i have removed the throttle body i was surprised to find out that i have the heater plate like bellow :
https://www.realoem.com/bmw/enUS/showparts?id=BE51-EUR-01-1992-E36-BMW-318is&diagId=11_1501 i remember that the previous owner told me that the head was taken from an E36 so i guess they took also the coolant lines looks like is loosing cooland on boths hoses. As far as vaccum leaks all hosed are craked and bandaged with tape so i need a new set. Already ordered a new TPS and an intake gasket.
ok same part as in this thread is on my car http://www.m42club.com/forum/index.php?topic=19570.0
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Update - i have removed the upper intake and ordered the water and air hoses that were damaged and and gaskets for throttle body and intake. i have 1 stripped bolt at the throttle body and missing one that holds ther part nr 16
https://www.realoem.com/bmw/enUS/showparts?id=AF91-EUR---E30-BMW-318is&diagId=11_0953 in the upper intake
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So , repleced 2 hoses from the throttle body heater replaced one vacuum line, need to buy also the rubber boot , made this video today https://flic.kr/p/2jChWCu appears that when i'm touching the upper throtle body the sound stops. I will try to get an E36 throttle body and test it.
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Looks like E36 has another part nr , would this work?
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The E36 one is missing the hose connection for the valve cover vent hose. If you have an E36 one laying around and just want to test things to see if the noise goes away, you could use it and just leave the valve cover hose disconnected. It also lacks the threaded holes for the bracket that holds the lower TB heater, but again it can be left off for testing purposes.
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ok , this is the throttle body from the car is this normal ? This motivates me to move to ITB :)
https://flic.kr/p/2jCXReW
anyway received the chain tensioner unfortunately it is extended i will try to compress it back to "transport postion"
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No need to compress it, you want it to be extended before you start the engine. It is VERY bad to run the engine with it compressed, even if the "official" procedure says to do that. Basically, the chain will be loose and slap around a lot until it can cause the tensioner to pop open. It is much better to put it in extended so that the chain will remain tight at all times, even if it is more difficult to install like that.
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Ok , did the test sound almost dissapeared still have some noise at start up, the E36 throttle does not have the play that E30 has, anyway i'm taking the car to a good friend that has a shop and i think he will get it right :)
however i can't find this type of throttle body in the junkyards/ebay
https://www.realoem.com/bmw/enUS/showparts?id=AF91-EUR---E30-BMW-318is&diagId=13_0309
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update, tested again with E36 throttle body , sound does not come from throttle body :(
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When you said "did the test sound almost dissapeared still have some noise at start up" what test did you do? If you meant that putting in the new chain tensioner caused the noise to be reduced, then it seems like the timing chain system has worn-out or damaged components. I know that you said that touching the throttle plate caused the noise to go away, so I'm a little confused. Honestly, after watching the videos again, I am not sure that I can tell which noise you are trying to eliminate.
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One year later sound is still there, changed the timing chain tensioner but no luck. After further investigation appears that noise comes from the starter motor/gearbox area.
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Aaaand yes , the noise comes from flywheel , the crown was loose appears that welding spots failed, will be welded again and since everything is taken apart also clutch will be changed . :)
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Just to confirm, clutch changed and flywheel repaired all good. Much quieter.
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Nice! I am glad to hear that you got it sorted out.
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Good Job!!
Now enjoy driving it!
Cheers,
~Ralph