M42club.com - Home of the BMW E30/E36 318i/iS
DISCUSSION => Engine + Driveline => Topic started by: Frankie on December 30, 2007, 01:49:44 PM
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Well, I just took off the valve cover to check whether the timing chain is loose or not. There has been a metallic hissing/rattling noise from the engine which I cannot locate accurate.
To my eyes the timing chain does not look worn? (278 000 kilometers on the clock). Pics --> http://picasaweb.google.co.uk/keimo12/NimeMTNAlbumi
Video shows how much the timing chain moves, is that too much? Video --> http://www.youtube.com/watch?v=_c-k6LhY3ss
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It will be loose as long as the tensioner is not pumped up with oil. It automatically tensions it.
You are lucky, looks like somone already went through and replaced your tining system. May want to consider replacing the tensioner, but otherwise those are some very new looking sprockets, which is how you can tell how bad th chain is. When they are sharp enough to cut, time to replace everything. Those are not even showing wear.
Not sure what the hissing sound is, mine is doing similar, I suspect the fan clutch or water pump.
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how do i change the tensioner
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http://m42club.com/forums/showthread.php?t=2925
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It will be loose as long as the tensioner is not pumped up with oil. It automatically tensions it.
You are lucky, looks like somone already went through and replaced your tining system. May want to consider replacing the tensioner, but otherwise those are some very new looking sprockets, which is how you can tell how bad th chain is. When they are sharp enough to cut, time to replace everything. Those are not even showing wear.
Not sure what the hissing sound is, mine is doing similar, I suspect the fan clutch or water pump.
I have already replaced the lower tensioner. What about other tensioners, can those be changed without all the timing hassle? Meaning that I would not like to get involved with cam timing.
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I have already replaced the lower tensioner. What about other tensioners, can those be changed without all the timing hassle? Meaning that I would not like to get involved with cam timing.
There is only one tensioner, the other sprocket is an idler.
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According to this pic, I can change parts 6, 7 and 14 without messing the timing?
(http://bmwfans.info/original/images/635_p.png) (http://bmwfans.info/original/E30/2-T/318is-M42/ECE/L/M/1990/11/mg-11/)
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hello.. i am new in this forum and so i wanted to say hello to everybody. i reading this forum for a while and there are a few very interesting things. i am actually living in switzerland... so forgive me my bad english.
i have got 3 complete 318is e30 and a 4th complete engine/gearbox/m3diff
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hey frankie. there is a point on the flywheel. you can see it through a hole of the gearbox, normally closed with a rubbercap.( have a look from the front to the back of the car.) turn this point down and then mark the cams and dont move them anymore. now you can remove everypart you want without messing the timing. i have done this many times before. usually you only have to replace the tensioner. the rest longs thousands and thousand of km. in my new engine i dont even have a tensioner anymore. it is a big screw.. it is fixed and cant move anymore.
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What do you think about adjustable cam chain tensioners?
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According to this pic, I can change parts 6, 7 and 14 without messing the timing?
(http://bmwfans.info/original/images/635_p.png) (http://bmwfans.info/original/E30/2-T/318is-M42/ECE/L/M/1990/11/mg-11/)
17 as well.
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What do you think about adjustable cam chain tensioners?
Why, you already have an automatic one.
An adjustable one means you would have to maintain it, and you do not know how much slack would be too much or not enough. Either is very bad.
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a friend of mine is driving his m3 e30 race car succesfully without the normal tensioner (nr17 on the picture above) its only a big screw. that works without problems.. and the engine makes about 330hp.. not 136hp, like the 318is :-)
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the reason behind the story is, that on high hp engines and above 9000-10000revs the chain, with the normal adjuster (with a spring), can jump over the sprocket on the crank or on the cams...!!! an then you have 16 small problems.... ;-) with the screw, nr 14 is fixed and anything moves.
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can you get a picture or drawing? for sportbikes it is very simple so I think it is posible to make one for M42 too.. ;)
Because I saw M3 engine for sale and there was written:
Totally rebuild complete S14 Rally engine Pistons: 95 mm Wössner (Germany) (new) 2.3 crank, 2.380 cc, Rods: Verdi(Sweden), Cams: Köhler (Sweden, kohler racing)12,5 mm / 11.8 mm 305/285 , Valves BMW M5 (38,5 mm / 33 mm) , Cam tappets: Schrick, Valve springs: Schrick, Valve spring retainers: BMW motorsport (titanium), Lash caps Schrick, The head is fully ported, 48 mm throttle bodies BMW, Header: 4-2-1 (Rally spec.), Adjustable cam chain tensioner, Bosch ref/sync sensors, BMW motorsport sync sensor holder (inlet cam front end), Generator (new), Starter motor, Full service for head is done , Power band 3500-9000 rpm. Very good driveability. High Torque,power.
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According to this pic, I can change parts 6, 7 and 14 without messing the timing?
(http://bmwfans.info/original/images/635_p.png) (http://bmwfans.info/original/E30/2-T/318is-M42/ECE/L/M/1990/11/mg-11/)
no you would have to remove the chain. You should probably try to get a look at 6 and we can tell you if its been replaced before
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the engine of my friend makes 380hp... not 330hp
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i dont have a picture or a drawing... but it is quit simpel. it is a specialy made screw (no spring inside) that replace nr.17. with this screw, you adjust nr.14. and then you lock the hole thing with another small screw on the side of the new nr.17 so the screw cant turn out anymore.
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can you make a sketch with paint? :)
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i can try..
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(http://i244.photobucket.com/albums/gg19/swiss318is/chaintensioner.jpg)
tata...
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(http://i244.photobucket.com/albums/gg19/swiss318is/chaintensioner.jpg)
tata...
Can you ask how to adjust it? How much to tighten it..
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yep, i have to ask him. when i go to the garage. if i forget it.. send me an email
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what about just taking the existing cap, drilling and tapping a hole in the center of it, then use a threaded rod (a wheel stud seems like it would be about the right length and most of them have holes for a hex wrench) then use a nut on that to tighten against the cap so the rod doesnt move. I dunno how all this would affect oil pressure though
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the piece i am telling, nr.19 and nr.17 ar one piece. so you can screw it in and out and then you can tighten it with the red screw
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The tensioner is oil sprayer too, so there should be oil channel to spray the oil on the chain. Do not forget that nickmpower..
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Remember, that is a race car that is checked over regularly, not just gas added and oil changed every now and again.
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i have only seen this solution on regularly checked engines and cars, such as racecars or special street cars.
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no you would have to remove the chain. You should probably try to get a look at 6 and we can tell you if its been replaced before
Hmm, you are saying that its not possible but Sheepdog is saying that it is possible :confused:
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hey frankie: my daily driven car has 240000km on the clock. the timing chain and all the sprockets are like new!!also all the guides like nr 14 and nr 6. !!! no need to be replaced. on this chain is no force (it should not....), like on a bicycle, it only turns around!! i watched your video and i think if you have to pull with such a lot of force to move it about 4-5mm then everything its ok.
if you want to change nr.6 you have to remove the chain, because nr.6 goes behind the chain.. there is no other possibility. for the rest you dont have to remove the chain.
QUESTION: does the noise disappear after a certain time? when the engine and the oil gets warm? what about the hydraulic valve lifters?
sheepdog already say it.. the tensioner fills with oil when it is warm, same the lifters!
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hey frankie: my daily driven car has 240000km on the clock. the timing chain and all the sprockets are like new!!also all the guides like nr 14 and nr 6. !!! no need to be replaced.
If they look new, you are good.
When one part is worn, they are all worn.
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yes you have to replace sprockets and chain together thats for sure.
i have got 4 m42b18 engines (180000km,180000km,190000km,240000km) and every singel sprocket and chain is as new..