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Engine Smoke 5 Mins After Start Up


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#1 gazza01

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Posted 01 December 2019 - 12:35 PM

Hi all.
Can I please ask that you know what your talking about on this issue before commenting.
Don't mean to be rude but please don't just answer for the sake of answering. Thanks.
So. My wife's 81 mini, which never gets uses and had done less than 200 miles in the last year or two has suddenly started to blow blue smoke after about five mins of running. I always thought if it were rings it would be straight away. And besides it hasn't been driven so why would the rings go.
I shall borrow a compression gauge from a mate soon just to check if there is anyone ring that may be well below the others, but until then I was wondering if any of you guys have had a similar issue. Maybe the head valve guides need to be checked for play? Any advice appreciated. Thanks.

#2 cal844

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Posted 01 December 2019 - 12:46 PM

Do the compression test, and ideally a leak down test.
Before beginning the test check the valve clearances.


When you do the compression test make sure the plugs are out and that you use full throttle when you crank the motor do one dry test then a wet test.

Hope this helps, I appreciate I might be telling you what you already know.

Cal

Edited by cal844, 01 December 2019 - 12:47 PM.


#3 gazza01

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Posted 01 December 2019 - 02:43 PM

[quote name="cal844" post="3625279" timestamp="1575204418"]Do the compression test, and ideally a leak down test.
Before beginning the test check the valve clearances.


When you do the compression test make sure the plugs are out and that you use full throttle when you crank the motor do one dry test then a wet test.

Hope this helps, I appreciate I might be telling you what you already know.

With the wet test is this done with a little engine oil to show the difference when any wear is taken up?

#4 BaronVonchesto

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Posted 01 December 2019 - 02:52 PM

if you can only do a compression test do cold dry, hot dry, cold wet, hot wet and post the results here.



#5 cal844

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Posted 01 December 2019 - 03:41 PM

Yes sorry, a wet test is indeed when you add a little oil

#6 Moke Spider

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Posted 01 December 2019 - 05:22 PM

It could be that the rings have gummed up.

 

You may find with some miles it might settle down or you can do an Oil change to some Diesel Engine Oil for about 50 - 100 miles and then change back to a normal oil. The Diesel Oil will dissolve and flush vanishes and 'gums' that can form. Don't leave the Diesel Oil in for too long.






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