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  #1  
Old 08-17-2004, 03:32 PM
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Valve tappet tightening (M103) HELP PLEASE!

Hey guys, does anyone know how to tighten the valve tappets on an M103 (300e)? I thought there would just be a tightening nut on the top but there isn't it's just covered with a solid piece. I think mine are loose... I'm getting a lot of racket from under the valve cover whenever it's idling but not while driving (above 1100rpms or so). It's not a deep knock like a bearing, and yet not a super light tapping, kinda inbetween the two.

If anyone could help me on this I would really appreciate it!!

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Old 08-17-2004, 04:35 PM
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On the M103, the tappets are hydraulic self adjusting.
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Old 08-17-2004, 05:05 PM
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Quote:
Originally Posted by MTI
On the M103, the tappets are hydraulic self adjusting.
damn... i see. i wonder what is causing all the racket then.. its only at idle too..
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Old 08-17-2004, 05:43 PM
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Under where you thought the adjuster would be (under the "solid" piece) is the hydraulic compensator, this operates like a lifter in a pushrod engine, and it can wear out, just like a lifter can collapse, so can this .
Or there is another possiblity. Between the compensators and the valve stems there is a small cup-shaped spacer, this I have seen flip out from between there somehow and will make alot of lifter-type noises.

Gilly
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Old 08-17-2004, 06:03 PM
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probably just a bad lifter
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Old 08-18-2004, 04:10 AM
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Quote:
Originally Posted by Gilly
Under where you thought the adjuster would be (under the "solid" piece) is the hydraulic compensator, this operates like a lifter in a pushrod engine, and it can wear out, just like a lifter can collapse, so can this .
Or there is another possiblity. Between the compensators and the valve stems there is a small cup-shaped spacer, this I have seen flip out from between there somehow and will make alot of lifter-type noises.

Gilly
very helpful info.. thanks Gilly!
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Old 08-18-2004, 04:48 AM
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No sweat. I'll also mention that the adjustment is possible 2 ways:
The "solid piece" you saw probably had what looks like a hole in the middle, this is actually just an ID mark, they come with "no" dot (thinnest), 1 dot (most common, next size up), 2 dots and 3 dots, I think that's it. OR the cup shaped washer is available in 2 different thicknesses, I think the thin one is most common, no ID marks on those that I'm aware of.
You'll have to pull the valve cover to search for the loose one, you may have to rotate the engine over a few times to find it, if the valve is pressed down you won't find it.

Gilly
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Old 08-18-2004, 05:00 PM
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Don't rule out the bushings on the belt tensioner shock. When they go the sound is very similar to what was described.
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Old 08-18-2004, 09:53 PM
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how is your oil pressure at idle?
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Old 08-19-2004, 02:17 PM
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Quote:
Originally Posted by neanderthal
how is your oil pressure at idle?
oil pressure is a bit low at idle when it's warm.. usually on 2... sometimes a little below that.

Quote:
Originally Posted by JoeR
Don't rule out the bushings on the belt tensioner shock. When they go the sound is very similar to what was described.
Thanks for this piece of info as well.. I will certainly factor this in since I am not sure where the pinpointed problem is. I'm afraid I may end up just taking it to a shop to have the problem checked out and fixed.
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Old 08-19-2004, 02:23 PM
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For diagnosing noise sources it's hard to beat a cheap stethoscope, available at an auto parts store for about $10.

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