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Old 03-20-2013, 10:08 PM
WlittleBenz
 
Join Date: Mar 2013
Location: Soperton, GA.
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“burn valve” ???

Hey,
Need a little help try to trouble shoot a problem. I am looking to get a 1997 E320; the owner says that the spark plugs have been just changed. Now the mechanic says that the car has a “burn valve” and not getting enough compression ;he says that the numbers should be 90; but Its 60. Does anyone have any advice about the possible problems and/or fixes to this issue?

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Old 03-21-2013, 07:39 AM
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Join Date: Nov 2002
Posts: 829
find another e320 to buy and/or find another mechanic. compression at 90 would be low, more like 150. never heard of a burn valve on any car. good luck, chuck.
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Old 03-21-2013, 07:49 AM
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ich fahre, also bin ich
 
Join Date: Mar 2002
Location: South Florida
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He means "burned valve", which is when the valve won't seal anymore, posibly due to overheating. Low compression can be due to a valve or ring issue, and usually a wet compression test is done to detemine which.
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Old 03-21-2013, 07:57 AM
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if you are correct about the burned valve, 90 is still too low for the engine, which is why i say-find another mechanic AND find another 97 e320 to buy. valve work on that engine ain't cheap. good luck, chuck.
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Old 03-21-2013, 10:27 PM
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Wet compression tests are a dead end. The best way to find compression leaks is to pump air into the cylinder and see where it leaks out. This also is the best way to find a cylinder to coolant leak.
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Old 03-21-2013, 10:51 PM
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Quote:
Originally Posted by porkface View Post
if you are correct about the burned valve, 90 is still too low for the engine, which is why i say-find another mechanic AND find another 97 e320 to buy. valve work on that engine ain't cheap. good luck, chuck.
depends how cheap the car is and what you can find for parts. If you find one at the picknpull, just grab the engine fro $200 or whatever and you're set. Sometimes you can poop a golden horseshoe...
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Old 03-22-2013, 06:37 AM
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A normal compression on a warm engine should be in the 160psi range. (M104)

Did someone do a Running compression test??

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