Best way to do an accurate compression test(6cyl Beemer)
25-11-2010, 04:35 PM
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Best way to do an accurate compression test(6cyl Beemer)
Ok,got my compression tester today and going to try and get my beemer sorted asap.
Now on the pack it says to get the engine warm before testing,does that sound right?I wasn't sure whether to do a test from cold as well?
I'm assuming I'm looking at reasonably consistent readings across the 6cylinders,what sort of tolerance am I allowed or even what sort of readings should i expect?
Thanks again,it's a 328i m52 engine.
Now on the pack it says to get the engine warm before testing,does that sound right?I wasn't sure whether to do a test from cold as well?
I'm assuming I'm looking at reasonably consistent readings across the 6cylinders,what sort of tolerance am I allowed or even what sort of readings should i expect?
Thanks again,it's a 328i m52 engine.
25-11-2010, 05:31 PM
#2
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make sure you pull fuel pump fuse for a start
if engine dosent run then you have no choice ref the hot / cold thing
but would be better warm as components will work best at opperating temp
take all six plugs out
when connected turn engine same amount of times for every cylinder to get readings
there should be no large difference between cyl's ie 1@ 120 & 1@ 75 but you will get slight differences in readings here and there
jobs a good un
if engine dosent run then you have no choice ref the hot / cold thing
but would be better warm as components will work best at opperating temp
take all six plugs out
when connected turn engine same amount of times for every cylinder to get readings
there should be no large difference between cyl's ie 1@ 120 & 1@ 75 but you will get slight differences in readings here and there
jobs a good un
25-11-2010, 07:15 PM
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make sure you pull fuel pump fuse for a start
if engine dosent run then you have no choice ref the hot / cold thing
but would be better warm as components will work best at opperating temp
take all six plugs out
when connected turn engine same amount of times for every cylinder to get readings
there should be no large difference between cyl's ie 1@ 120 & 1@ 75 but you will get slight differences in readings here and there
jobs a good un
if engine dosent run then you have no choice ref the hot / cold thing
but would be better warm as components will work best at opperating temp
take all six plugs out
when connected turn engine same amount of times for every cylinder to get readings
there should be no large difference between cyl's ie 1@ 120 & 1@ 75 but you will get slight differences in readings here and there
jobs a good un
Good thinking regarding fuel pump fuse!!the car runs ok but it's had a few cooling issues which I'd like to address before I spend any more time and money on this engine!!!Thanks again.
25-11-2010, 07:21 PM
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Ahh haa!!so that way round it shows that it's bore related as the 2 stroke provides the sealing necessary to provide a reading therefore proving wear in that cylinder?Cool!!!
25-11-2010, 07:31 PM
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do the test with dry cylinders then a couple pumps of engine oil from an oil can to do a wet test
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