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Old 08-16-2007, 08:28 AM
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Andy_M
 
Join Date: Jul 2007
Location: Northwest NJ
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M103 engine compression specs

Can anyone tell me the compression numbers I should be seeing on the M103 engine in my 90 300E ? 3.0L SOHC


Last edited by Andy_M; 08-16-2007 at 09:01 AM.
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Old 08-16-2007, 10:19 AM
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andy

i didnt look it up,but from memory you should be around 170psi for a new engine.
larry
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Old 08-16-2007, 01:06 PM
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Andy_M
 
Join Date: Jul 2007
Location: Northwest NJ
Posts: 132
Really ? I'm seeing between 185 and 195 on all cylinders except the one I believe I have a valve issue on (#3 = 10psi) and one other (#5=145) which seems to run fine (plug shows good color) but obviously is also a little under the weather.

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