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crwdns2944351:0crwdnd2944351:0Mercedes W123 Basic Diesel Blow-by Test Techniquecrwdnd2944351:0crwdne2944351:0

crwdns2933797:0Nicolas Siemsencrwdnd2933797:0crwdne2933797:0

crwdns2936043:0crwdne2936043:0 crwdns2933505:0crwdne2933505:0 Nicolas Siemsen

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Mercedes W123
Type
technique
Title
Mercedes W123 Basic Diesel Blow-by Test Technique
Introduction
Over many decades of service a W123 diesel engine is put through a lot. Over time the piston rings and cylinder walls will not seal against each other quite as well. It's inevitable. However, how much compression blow-by you get in to your engine's crank case depends a lot on how well the engine was maintained over it lifetime.
One quick and simple test for this is to check the engine for blow by while it's running by following the steps in this guide.
If you find that the engine has substantial blow by, don't necessarily fret over it! You'll want to follow up with a full compression test as that's the only scientific way to confirm the health of your engine. This is just a starting point.
Time Required Min
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Time Required Max
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Difficulty
Very easy
Conclusion
If you find a lot of blow by, follow this up with 1) a valve adjustment and then 2) a compression test to verify the health of the engine.
Author
Nicolas Siemsen
Public
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