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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sat, May-21-2011, 02:04:01 PM   #1
03 L M3
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Default Do timing belts need changing

100 k miles
do these cars need timing chain replacement or belt

Oh by the way from the info I've found on the this site the valve adjustments should be between 0.18 and 0.23? Correct? Does it matter if u are closer to one or the other or is the smaller number for the inlet and the larger for the exhaust valves?
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Old Sat, May-21-2011, 02:33:39 PM   #2
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Default Re: Do timing belts need changing

The timing chain/tensioners usually doesn't need need to be replaced, maybe somewhere north of 200K+ miles, but def not at 100k. As for valve adjustment, intake is 0.18mm to 0.23mm, exhaust is 0.28mm-0.33mm. I like to put them in the center of the range. That way they can get looser or tighter by 0.02mm over time and still be within specs.
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Old Sat, May-21-2011, 03:21:23 PM   #3
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Default Re: Do timing belts need changing

I have a friend who is a master tech at BMW, he told me that when making valve adjustments you main concern is the higher end of the spec. as the springs wear over time they get softer. this prevents the valve from opening up all the way. if its out of the loose spec at all change to the middle of the spec.

i had several of my valves that were a little tight, but they werent making contact with the cam. a little tight is ok, too tight is bad bc it will make contact with the cam when its not supposed to. use a little bit of judgement here for the tight side.
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Old Sat, May-21-2011, 06:51:35 PM   #4
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Default Re: Do timing belts need changing

Quote:
Originally Posted by duracellttu View Post
I have a friend who is a master tech at BMW, he told me that when making valve adjustments you main concern is the higher end of the spec. as the springs wear over time they get softer. this prevents the valve from opening up all the way. if its out of the loose spec at all change to the middle of the spec.
Either your master tech friend is FOS, or you misunderstood him. Springs may get "softer" (ie - loose tension) with age, but that would make the valves open EASIER, and be more likely to float at high RPM. Since I've never heard of this being a problem on S54 engines, I rather doubt that it's really an issue.
Quote:
i had several of my valves that were a little tight, but they werent making contact with the cam. a little tight is ok, too tight is bad bc it will make contact with the cam when its not supposed to. use a little bit of judgement here for the tight side.
I don't understand - the tight valves weren't making contact with the cam? How did they open?

I think you might do some studying on valve trains and how they work..

BTW - too tight isn't good because the valve isn't closed the amount of time it's supposed to be. That can lead to blowby past the valve during the compression stroke, and excessively hot exhaust gases going past the valve on the exhaust stroke. It also leads to the valve overheating since it isn't closed long enough to transfer heat to the valve seat in the head. The extra "slam" that a tight valve gets on closing also can cause valves to mushroom (heads fold up) and valve seats to recess. ALL are bad things.
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Old Sun, May-22-2011, 05:02:13 AM   #5
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Default Re: Do timing belts need changing

Quote:
Originally Posted by deilenberger View Post
Either your master tech friend is FOS, or you misunderstood him. Springs may get "softer" (ie - loose tension) with age, but that would make the valves open EASIER, and be more likely to float at high RPM. Since I've never heard of this being a problem on S54 engines, I rather doubt that it's really an issue.

I don't understand - the tight valves weren't making contact with the cam? How did they open?

I think you might do some studying on valve trains and how they work..

BTW - too tight isn't good because the valve isn't closed the amount of time it's supposed to be. That can lead to blowby past the valve during the compression stroke, and excessively hot exhaust gases going past the valve on the exhaust stroke. It also leads to the valve overheating since it isn't closed long enough to transfer heat to the valve seat in the head. The extra "slam" that a tight valve gets on closing also can cause valves to mushroom (heads fold up) and valve seats to recess. ALL are bad things.
Correct, bottom line a tight valve will be a burnt valve in short order.
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Old Sun, May-22-2011, 09:37:52 PM   #6
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Default Re: Do timing belts need changing

the chain only need to be replaced if it looks worn.

Another thing is that the chain streaches over time and your camshafts will missalign.
Last year I replaced the camshafts on my 850, I checked the timing and the camshafts were out with about 1 tooth. (95.000mile engine).
When the new ones were installed the timing was set perfect.

at some stage, 100-150.000miles pehaps it may be an idea to check how the camshafts is related to the crankshaft.

I thought about having my M3 checked on the next inspection.
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Old Mon, May-23-2011, 05:03:06 PM   #7
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Default Re: Do timing belts need changing

Quote:
Originally Posted by Noggie View Post
the chain only need to be replaced if it looks worn.

Another thing is that the chain streaches over time and your camshafts will missalign.
Last year I replaced the camshafts on my 850, I checked the timing and the camshafts were out with about 1 tooth. (95.000mile engine).
When the new ones were installed the timing was set perfect.

at some stage, 100-150.000miles pehaps it may be an idea to check how the camshafts is related to the crankshaft.

I thought about having my M3 checked on the next inspection.

you can't check relationship of your cams to your crank on s54.
it is called VANOS. VANOS adjusts your camshafts to whatever it needs.
you check the relationship of cam shafts to VANOS at the fully retarded position and crank at TDC.

http://www.rfdm.com/Daniel/MRoadster.../11_31_005.pdf
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Old Mon, May-23-2011, 11:08:06 PM   #8
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Default Re: Do timing belts need changing

Quote:
Originally Posted by deilenberger View Post
Either your master tech friend is FOS, or you misunderstood him. Springs may get "softer" (ie - loose tension) with age, but that would make the valves open EASIER, and be more likely to float at high RPM. Since I've never heard of this being a problem on S54 engines, I rather doubt that it's really an issue.
one characteristic of a spring getting softer with age is that it will compress and not expand out to the distance it did when it was brand new. example: if I have a spring measured the height of it then hit the top of it 100k times and measure again, chances are it will be shorter after I hit it.

yes, you are right, it will open easier and it is more likely to float.

Quote:
Originally Posted by deilenberger View Post
I don't understand - the tight valves weren't making contact with the cam? How did they open?
my comment about tight valves "not making contact" was in regards to when it was positioned opposite of TDC. of course its going to open when it makes contact at TDC when the gap is tight of the spec. if you are too too tight you are will start to get contact around the rest of the cam. ie - when you get valve creep towards the cam.
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Discussing Do timing belts need changing in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)