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Old 18-08-2017, 00:53   #1
DeltaBoxer
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Unhappy The Popping Dipstick

Hi Fellow Evo owners,

I am having an issue with my Evo V I recently picked up a few days ago. The Dipstick has started popping out on full boost causing oil to be sprayed inside the bonnet and all over the rear side of the block. (I have an Evo VI engine installed)

Things I have checked so far are as follows:
Catch can tube checked and is clear
Dip Stick rubber rings replaced for a better seal (Much better now however still forced out by pressure)

I have listened to the engine and it sounds like its running fine. No smoke, knocks, No strange colored oil in the oil cap, Plenty of power still, No loss of boost and the car is running a standard turbo with a standard ECU. The boost pressure is currently reading at 0.9bar and holds. Do I put it back to the standard recirc or not? Is the cheap catch tank the previous owner installed to blame? Upon inspection, it has absolutely nothing in it.

I am yet to check the CVS valve as I am not sure of its position. Is there any owners that have experienced this and can offer some advice ? I would very much appreciate your help. I am told that this could be blow by from the piston rings being tired but I am hoping its just something a tad less depressing. I've just bought the damn thing and I am in love with it.

Cheers!
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Old 18-08-2017, 00:57   #2
Andrew B
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Probably perished o rings start with a fresh set for the dipstick very common issues
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Old 18-08-2017, 02:51   #3
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Dipsticks popping out and oil everywhere is usually a bad sign. Sounds like crankcase pressure caused by worn rings or damaged ringlands. I'd get leakdown test done to confirm


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Old 18-08-2017, 04:57   #4
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Have you checked the pcv valve?

https://www.facebook.com/letsaskkama...08301195924330


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Old 18-08-2017, 06:10   #5
foreskin fred
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It's ALWAYS broken ring lands.


Compression tests don't normally pick it up.
Neither do leakdown tests.

Oil on the plug threads never fails.




edit because I'm out of posts.......

Those pics below from evo6er, newish looking plugs, cheap coppers.
What they show is that it's running too rich at low load.......glowplugs.
Probably caused by the usual fitting of a pump that's too big along with a stock FPR.
That would have caused knock at higher loads due to the drifting tune...then the pistons end up broken.

If you refit the plugs, carry on driving, they'll end up oily.
But that will also cause more damage to the cylinder walls.
It turns an easy fix into an expensive fix.
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Old 18-08-2017, 07:41   #6
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Quote:
Originally Posted by foreskin fred View Post
It's ALWAYS broken ring lands.


Compression tests don't normally pick it up.
Neither do leakdown tests.

Oil on the plug threads never fails.


You are wrong on this occasion. Leakdown test can identify broken ringlands. I know this first hand


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Old 18-08-2017, 08:31   #7
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Fred's pretty much on the money imho, it's almost always ringlands and it's hard to check as they leak under boost conditions that you cannot reproduce whilst engine is not running.
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Old 18-08-2017, 08:57   #8
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Sorry to diagnose ring lands straight away is daft!, Simple things such as orings or pcv can cause this!
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Old 18-08-2017, 08:59   #9
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I was munching through oil on a 42k MR engine and was down on power. I then had the dipstick pop out a couple of times then developed a moody misfire so pulled the plugs.

This was the plug from cylinder 2



These were the other 3







So the car went to an EVO specialist where it was confirmed compression was down massively on cylinder 2 followed by a leakdown which produced a significant amount of pressure out of the filler cap.

This was piston in cylinder 2





So the plugs didn't identify the issue to me but the leakdown and compression test did.

Can you can see a difference between all four plugs?


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Old 18-08-2017, 10:00   #10
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Quote:
Originally Posted by sbn1979 View Post
Sorry to diagnose ring lands straight away is daft!, Simple things such as orings or pcv can cause this!
Can do, but as said it is seldom that easy especially on the earlier models ( I should know I've had ringlands go many times due to mostly my own fault) it's notoriously difficult to check as engine needs to be boosting, and moving preferably, typical leakdown test can be around 150psi but when your engine is on boost compression is far higher. Fit a spring on the dipstick and check oil cap, as crankcase pressure will leak from here also giving you another clue. I hope it's pressure control vale for the sake of the OP but there again I've been there and paid the price.
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Old 18-08-2017, 10:06   #11
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Quote:
Originally Posted by Evo6er View Post
I was munching through oil on a 42k MR engine and was down on power. I then had the dipstick pop out a couple of times then developed a moody misfire so pulled the plugs.

This was the plug from cylinder 2



These were the other 3







So the car went to an EVO specialist where it was confirmed compression was down massively on cylinder 2 followed by a leakdown which produced a significant amount of pressure out of the filler cap.

This was piston in cylinder 2





So the plugs didn't identify the issue to me but the leakdown and compression test did.

Can you can see a difference between all four plugs?


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Some only break one of the ringlads, in your case you've got two... and in the same place and could be easier to detect
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Old 18-08-2017, 11:18   #12
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Are the ringlands a weak point on all the models? Aside from the OP and oil usage could this also cause scoring to bores or even engine failure?
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Old 18-08-2017, 14:23   #13
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Quote:
Originally Posted by foreskin fred View Post
It's ALWAYS broken ring lands.


Compression tests don't normally pick it up.
Neither do leakdown tests.

Oil on the plug threads never fails.
There is no oil on the plugs, The car runs fine and its only poping on boost. No smoke from the exhaust on cold start or running. I am yet to do the compression and leak down test.
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Old 18-08-2017, 14:28   #14
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Quote:
Originally Posted by Evo6er View Post
I was munching through oil on a 42k MR engine and was down on power. I then had the dipstick pop out a couple of times then developed a moody misfire so pulled the plugs.

So the car went to an EVO specialist where it was confirmed compression was down massively on cylinder 2 followed by a leakdown which produced a significant amount of pressure out of the filler cap.


So the plugs didn't identify the issue to me but the leakdown and compression test did.

Can you can see a difference between all four plugs?


Sent from my iPhone using Tapatalk


The strange thing about it is that there seems to be no oil usage and no power loss.
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Old 18-08-2017, 14:29   #15
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Quote:
Originally Posted by Andrew B View Post
Probably perished o rings start with a fresh set for the dipstick very common issues
I have already replaced the O Rings with much better ones however it is still popping under the pressure. The car is only running 0.9 bar!
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