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Old 13th February 2018, 10:29 AM   #1
Josh0m3
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Default S54 HeadGasket

As titled.

Compression test has come back and all cyclinders are pushing just past 10bar.

I had originally planned on having it done and do it as a preventative maintenance but Iím having second thoughts.

Paul the mechanic said itís totally your choice but if it was his car heíd leave it. If it isnít broke donít fix type of thing, and seeing as other problems have risen it seems sensible to leave.

Just wondering what other peopleís veiws are on this. As itís at the garage would you just bite the bullet and get it done?

Thanks, Josh
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Old 13th February 2018, 11:52 AM   #2
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I'd side with if its not broke leave it alone
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Old 13th February 2018, 12:25 PM   #3
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Leave it alone. Fortunately he HG is one of those things that actually can give you a warning. Unlike the vanos or rod bearings.

So vanos and rod bearings I would do as preventative.

HG I would leave.

By the way 145psi is a little on the low side but I guess the main thing is the Grouping.

If two fall and other stay up then you know there is an issue
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Old 13th February 2018, 07:41 PM   #4
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Quote:
Originally Posted by schooner32 View Post
Leave it alone. Fortunately he HG is one of those things that actually can give you a warning. Unlike the vanos or rod bearings.

So vanos and rod bearings I would do as preventative.

HG I would leave.

By the way 145psi is a little on the low side but I guess the main thing is the Grouping.

If two fall and other stay up then you know there is an issue
I am now indeed.

Vanos is undergoing surgery and also the bearings with arps.

Whatís the expected Psi/bar on the s54?
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Old 13th February 2018, 07:45 PM   #5
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1/2 tsp of oil
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Old 13th February 2018, 10:36 PM   #6
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leave her be!
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Old 18th March 2018, 11:25 AM   #7
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Yeah, I wouldn't bother doing the headgasket at this point. Other things would take priority!

Rod bearings
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Old 18th March 2018, 11:59 AM   #8
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Has anyone identified the reason for the head gasket's failing? seems they can fail as soon as 60k or last as long as 120k..

When I first heard of the problem I assumed it effected track cars that would experience heavy use/ high engine bay temps from repeatedly hard driving but it seems to be a real luck of the draw the more I see.

I wouldn't be paying to have mine changed unless it failed, its not as if there is an uprated version from BMW or aftermarket to keep with the stock compression that guarantees it will last another 60k+ once changed especially if the head/block has warped at all.
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Old 18th March 2018, 12:39 PM   #9
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If it ain’t broke don’t fix it...
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Old 18th March 2018, 12:58 PM   #10
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They tend to fail between the cylinders, this is because there's very little material separating each cylinder. Take a look at a s54 head gasket and you'll see what I mean.
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Old 18th March 2018, 01:07 PM   #11
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Quote:
Originally Posted by Wicksy View Post
They tend to fail between the cylinders, this is because there's very little material separating each cylinder. Take a look at a s54 head gasket and you'll see what I mean.
Between 5 and 6 mine
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Old 19th March 2018, 07:20 AM   #12
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I understand they fail between the cylinders but my question was what shortened the life? As said previously some go at 60k others have made it to 120+k? Is it a heat cycle issue as opposed to mileage
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Old 19th March 2018, 06:46 PM   #13
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I don't think there's just 1 thing that deviates between each car.

You've obviously got the driver and how well the car has been treated. How often is it wound up to red line, how hot do you get the engine, how do you cool it down after a spirited drive, has it ever had a supercharger fitted. So many things that COULD contribute. As soon as there is a minor stress point there or as soon as it starts to erode then there's no stopping it.
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Old 27th March 2018, 12:19 PM   #14
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My guess would be extended use of 95 ron fuels and not the recommended 97 at some point in the cars life causing damage to a vulnerable area (between cylinders is very narrow)
Obviously there a lots of variables to consider, thats just my best guess.
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Old 27th March 2018, 12:59 PM   #15
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Quote:
Originally Posted by MWagon View Post
My guess would be extended use of 95 ron fuels and not the recommended 97 at some point in the cars life causing damage to a vulnerable area (between cylinders is very narrow)
Obviously there a lots of variables to consider, thats just my best guess.
I doubt it. Using higher octane fuels won't have any effect. The engine adapts for it. Higher octane fuels are best to prevent engine knock but we have knock sensors that are very very sensitive and engine will adapt.

Ireland we can only get ,95 Ron and I would say HG are relatively rare here on s54 .
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