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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 01-19-2011, 08:34 PM   #1
panzerjp
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Question Dangers of Never Perform a Valve Adjustment?

Hello everybody.

@ 40K, It seems like my American version 2003 M3 has reached the point where a valve adjustment calls in (Im out of the USA and out of warranty).

Around here (The Dominican Republic) has been very difficult to find a mechanic qualified for the job and going to the dealer will cost me and arm and a leg (they charge 500 USD just for an oil change!!!! )).

I was wondering, what could happen if I decide not to perform a valve adjustment? Am I risking the life of my beloved M3 engine?

Any input is greatly welcomed and thanks in advance.
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Old 01-19-2011, 08:38 PM   #2
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You can find a DIY and try that yourself.

I wouldn't suggest going on without performing an adjustment that is so important.
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Old 01-19-2011, 08:48 PM   #3
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You could do it yourself just take your time and get the right tools. Do you live in the dominican...

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Old 01-19-2011, 08:57 PM   #4
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If you have never performed the job, it still can be quite tricky. But the best option is to order

http://www.trademotion.com/partlocat...catalogid=4462




You may need more than a handful of shims replaced if they have never been adjusted. The kit will have more than enough as some valve adjustments require only replacing 2 or 3.

But once you have the kit, you will be able to service your car for the entire life of the car, or do adjustments for others. That is the most affordable ways and there are many DIY on the internet.

Truly the adjustments depends on the way you drive. @ 20k intervals the good people at Mshops have seen cars which require zero adjustments. The shop recommends atmost 50k before you need major adjustments. This will efffect your performance and fuel economy and all around sluggishness.

I only recommend doing A DIY if you have lots of time, and mechanically inclined . The car needs to be cold and it may take more than a few hours or day for first timers.
Dont forget to get the gasket as listed in the bottom of the link above and good luck. @ 40 you should be okay. but make it a mandatory thing by 50.

And if the valves were never adjusted before during inspection 1, I do recommend getting them done by the time it hits 50k.

And no it wont blow up, it will just make strange noises and run sloppy.
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Old 01-19-2011, 08:58 PM   #5
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Im asking because I'm planning to move down there and help my dad run the family business and taking my m3 with me and I would like to know how are the fanatics over there.

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Old 01-19-2011, 09:08 PM   #6
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Mach had is right.

Won't blow up your engine, but it won't run to it's full potential though..
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Old 01-19-2011, 09:14 PM   #7
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To answer your question- if you don't perform a valve adjustment, the clearance between the cam lobes and the valves (through the rockers and shims) can change over time. It happens slowly but it does happen.

If the clearance increases a little, you could get some valve noise... if it increases a lot- you may get accelerated wear and/or component failure.

If the clearance decreases a little, you likely won't notice any symptoms... if it decreases a lot- you could lose compression and even burn out a valve.

In a perfect world, there's a very good chance our engines could go 150,000 miles and never see any consequence of never doing a valve adjustment. But in the real world, a car with 30,000 miles (or less) may develop clearance issues on one or more valves. The safe and recommended approach is to check them regularly and adjust as needed which might mean at every check, you adjust.... just as easily as it could mean you could check 5 times and never "need" an adjustment.

I agree with the others though- this is something you should do yourself as it's nearly impossible to confirm IF this expensive service was really done if you don't witness it.

Last edited by jav; 01-19-2011 at 09:29 PM.
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Old 01-19-2011, 10:13 PM   #8
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It's an easy job if you're mechanically inclined IMO, just a bit time consuming. But the actual work is very basic.
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Old 01-20-2011, 01:05 AM   #9
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Just follow the diy and take your time. The 1st time I did it, it took me 10 hours but that's including many trips to the dealer and parts store to buy tools that I didn't have. The consuming part about the valve adjustment is trying to take apart all the things but once it's in the engine it is pretty easy to replace the shims. You will feel very satisfying when you measure an out of specs valve because of all the time that you put in getting to them. I am not a mechanically incline guy and the most that I did before was changing my own engine oil. My advice is to read the diy and members' advice carefully a few times and just follow the steps as you go. It is pretty basic thing to do but it's just time consuming. Good luck and here is the diy link that I followed when I do my valve adjustment.

http://www.m3forum.net/m3forum/showthread.php?t=113415
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Old 01-20-2011, 06:19 AM   #10
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Thumbs Up WoW...Many Thanks!!!!

Many Thanks Guys!!!!!....This Forum is awesome....Im not mechanically inclined but with the info found on the DIY and a mechanically inclined friend, I think we will be up to the task.

Again Many Thanks, If anyone plans to come to the Dominican Republic, please let me know and I can help you out with your visit.
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Old 01-20-2011, 06:26 AM   #11
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Thumbs Up Lots of Bimmerheads around here

Quote:
Originally Posted by pmoneyblass View Post
Im asking because I'm planning to move down there and help my dad run the family business and taking my m3 with me and I would like to know how are the fanatics over there.

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Around here there are lots of BMW fanatics (count me as one!!!! I have a M3 here and a 1974 2002 in my hometown "El Salvador")...I could even introduce you to some of them.

Just Let me know.


Again, many thanks to you all!!!!
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Old 01-20-2011, 07:59 AM   #12
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Quote:
Originally Posted by panzerjp View Post
Many Thanks Guys!!!!!....This Forum is awesome....Im not mechanically inclined but with the info found on the DIY and a mechanically inclined friend, I think we will be up to the task.
I am grabbing my friend who is a mechanic to help me with my valve adjustment. I was going to have the BMW dealer do it, but not being able to prove that they did it and all the help on these forums. I am going to do it myself.

I think you're making a sound decision.
GL and let us know how it goes!
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Old 01-20-2011, 08:41 AM   #13
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The first time I do my valve adjustment, I too am doing with another fanatic who offered to help me, since he has of course down the procedure several times. Looking forward to learning it myself
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Old 01-20-2011, 09:02 AM   #14
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my friend had 100k without a valve adjustment and it ran strong.
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Old 01-20-2011, 09:33 AM   #15
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u can burn up the valves in the worse case scenario.

I have a new kit/tool for sale: http://forum.e46fanatics.com/showthread.php?t=817684
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Old 01-20-2011, 10:24 AM   #16
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Old 01-20-2011, 11:17 AM   #17
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The most important valve adjustments is the first one since thats when you'll usually have to replace the most shims due to everything wearing in since new. After that you'll probably only have to replace a couple shims the next few times, and they likely won't be out of spec much.

Quote:
Originally Posted by bimmerboi19 View Post
my friend had 100k without a valve adjustment and it ran strong.
Your friend needs a new car if can't afford a valve adjustment.
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