pekwah1
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| posted on 5/6/13 at 04:32 PM |
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Crossflow low compression help!
Hi Guys,
So i have a 1300 xflow in my car, it's been a bit poorly as follows:
All 4 spark plugs have oil on the threads (can this be from overfilling the oil?)
If i remove all four and refit, the car seems to run quite nicely, but when i then come back the next day it's running like a pig again, and
again oil on the spark plugs.
I have just done a compression test, it was only showing around 60-65psi on all 4 cylinders and didn't change when wet (although as there is
already oil in the bore i didn't think this would!)
I am already geared up to strip the engine and have a full gasket set and valve stem seals, but wondered what you guys make of this?
Thanks in advance.
Andy
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ian locostzx9rc2
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| posted on 5/6/13 at 04:50 PM |
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Is the compression tester ok because 60 psi is very low if there all even i think the tester is faulty,But if the plugs are oiling up then you most
likely be stripping the engine. anyway..
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pekwah1
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| posted on 5/6/13 at 05:02 PM |
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there is a good chance the tester could be a pile of crap as it didn't cost a lot...
In regards to oil in the spark plugs, what are the possible causes for this?
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owelly
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| posted on 5/6/13 at 05:09 PM |
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If there is blue smoke on start-up but it then starts to run clear, I would suspect valve stem seals. If the engine smokes all the time whilst
running, then suspect worn rings/bores. If there's a puff of smoke after overun whilst driving, that would also point to inlet valve stem seals.
http://www.ppcmag.co.uk
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Andy S
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| posted on 5/6/13 at 05:48 PM |
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Are you compression testing with the engine warm and the throttle fully open?
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pekwah1
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| posted on 5/6/13 at 07:14 PM |
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I think there is more smoke on overrun, I did the test cold with throttle wide open
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perksy
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| posted on 5/6/13 at 09:05 PM |
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Leak down test would be best or a decent compression tester BEFORE stripping the engine to bits to confirm where the issue lies.
However, from your comment/s i'd be thinking Valve stem oil seals or valve guides.
Compression test should ideally be done with the engine at operating temp and with a fully open throttle.
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