[Cbatoday]

Thank you

 

[Cbatoday]

i have done a compression test on the mini one that failed the emissions test and here are my findings

1st psi figure with hot engine 2nd psi figure with hot engine with syringe of oil

Cylinder number 1, 125 psi 150 psi
Cylinder number 2, 127 psi 152 psi
Cylinder number 3, 126 psi 152 psi
Cylinder number 4, 126 psi 152 psi

does the engine require piston rings or valve stem oil seals or both.

bought the car needing timing chain kit and head gasket. the engine runs smooth after installing an new head gasket (pressure test on head was ok ) so do you think valve stem oil seals will solve this issue as they may have become cooked with head and timing issue

 

[Cbatoday]

i have done a compression test on the mini one that failed the emissions test and here are my findings

1st psi figure with hot engine 2nd psi figure with hot engine with syringe of oil

Cylinder number 1, 125 psi 150 psi
Cylinder number 2, 127 psi 152 psi
Cylinder number 3, 126 psi 152 psi
Cylinder number 4, 126 psi 152 psi

does the engine require piston rings or valve stem oil seals or both.

bought the car needing timing chain kit and head gasket. the engine runs smooth after installing an new head gasket (pressure test on head was ok ) so do you think valve stem oil seals will solve this issue as they may have become cooked with head and timing issue

little bit of blow past by looks of that,, but not bad really all even might find a good service and seafoam the oil and bores might increase them, when engine running and id hot how much vapour comes out of oil filler cap hole when removed,, if a lot then oil change and seafoam it give it a good run thats what i would try first off,, how many miles the engine done

Engine has done about 115,000 miles.
Dropped engine oil to do the chain then dropped and replaced when worn oil pump was changed so oil is clean.
Was annoyed with local engine shop as when I asked him to change the valve stem seals he said they don't go on these.
What does seafoam do.
With the compression readings as they are would the blue smoke indicate seals

 

[Cbatoday]

As Mike - low but even, which is good.

So what would remedy this to get it through the mot emissions

 

[Cbatoday]

Engine has done about 115,000 miles.
Dropped engine oil to do the chain then dropped and replaced when worn oil pump was changed so oil is clean.
Was annoyed with local engine shop as when I asked him to change the valve stem seals he said they don't go on these.
What does seafoam do.
With the compression readings as they are would the blue smoke indicate seals

seafoam cleans the carbon off the piston rings and recesses if gummed up could be holding off sides of bores as such, if add to fuel tank it will whit smoke on petrol engines until its out of the system but dose clean it all out, also if its in the cat and exhaust will do the same would need to take car for a 20 mile run to clear it on that level. best treatment on a petrol engine is spray a tead in each bore leave it over night to soak, and stick can in engine oil run it for 50 miles then change oil it will clean all carbon and dirt out of the whole engine

Are there specific types of seafoam I need.

Do you think it could be the valve stem seals

 

[Cbatoday]

Are there specific types of seafoam I need.

Do you think it could be the valve stem seals

https://www.ebay.co.uk/itm/SEA-FOAM...ck-SF16-SS14/252949392944?epid=899626704&hash=item3ae4f56e30:g:YNIAAOSwaEhZILG4
above link double pack one is a inlet and spray type, other is pour in oil
could be stem seals without removing it hard to tell

Thanks for that. I have spoke to a local mini specialist who has told me he has made a tool that can be used to remove and replace the valve stem oil seals for £200 in labour. I have the valve stem oil seals from a headset I used.
I worked out that the time I would need to remove the head and get a specialist to then change the seals plus a new head gaskets and bolts would far exceed the £200 quoted
Just a bit worried if the seals are changed but the issue is still there.
I suppose once that's done I can run some seafoam through it

 

[Cbatoday]

Are there specific types of seafoam I need.

Do you think it could be the valve stem seals

https://www.ebay.co.uk/itm/SEA-FOAM...ck-SF16-SS14/252949392944?epid=899626704&hash=item3ae4f56e30:g:YNIAAOSwaEhZILG4
above link double pack one is a inlet and spray type, other is pour in oil
could be stem seals without removing it hard to tell

Was looking at mot refusal certificate
Has
exhaust carbon monoxide [8.2.1.2a]
Exhaust emits excessive dense blue smoke during acceleration
[8.2.1.2g]

Didn't notice this one before.
Exhaust emissions likely to be affected by an exhaust leak front
[8.2.1.1d]

Had a look and seems to be where the flexi joint is. Would this cause bad emmisions that are enough to push it over the threshold.

Fast idle test
CO 0.43%
HC 390 ppm
¿ 1.047

Second fast idle test
CO 0.62%
HC 520 ppm
¿ 1.040

Natural idle test
CO 0.63%

What do you think

 

[Cbatoday]

exhaust leak might effect the down stream 02 sensor but wont cause oil burning blue smoke, maybe the rocker cover pcv valve is faulty allowing crankcase oil in to the inlet.

Are they cleanable or replaceable

 

[Cbatoday]

Well some good news at last after the car had lots of blue smoke and had failed the mot.
Took it to the local mini specialist.
He has made a tool to remove and replace the valve stem oil seals with the head in place
He did the job on Friday and the car past the mot this morning.

He is of the same view as mike1967. When these engines are low on oil it starts a chain of events. First the chain stretches throwing the timing out this causes overheating and makes the valve stems hard and creates blue smoke
Also the excess fuel damages the o2 sensors and the cat
If left long enough the chain jumps and damages the valves
Can't stress enough keep your oil at the correct level

 

[Cbatoday]

I think it's a combination of lazy owners not checking the oil but more so on the dealerships and the manufactures telling customers that service intervals are longer due to long life oil. This is a selling point as it reduces the cost of car ownership.
But by doing this owners believe that oil doesn't need checking between servicing.

 

[Cbatoday]

Now the car has passed it's emission after valve stem have been replaced the mechanic said it needs a good run to clear all the oil residue from the manifold through to the downstream sensor
Would a bottle of cataclean or seafoam be any help cleaning it out along with a good run on the motorway