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Oil Leaking From Clutch Housing and Supercharger Breather Set Up


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#1 sam138

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Posted 13 July 2021 - 08:48 PM

I’ve recently installed a supercharger kit on my existing 1275cc Cooper engine. I’ve been setting up the timing and fuel today however I’ve noticed oil dripping from the split pin under the clutch.

Does this mean that the orange oil seal has gone behind the clutch ? I’m struggling to understand why it’s gone as the car was perfectly fine in NA form producing a healthy 73bhp at the flywheel.

Could this have anything to do with the increased pressure from the supercharger being added ? I have removed the timing cover breather but added another back in where the original mechanical fuel pump was.

Any help would be much appreciated as I’m loosing faith with this supercharger as it’s issue after issue.

Edited by sam138, 13 July 2021 - 08:50 PM.


#2 nicklouse

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Posted 13 July 2021 - 08:59 PM

Yes. Or you have a failed casing.



#3 Dusky

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Posted 13 July 2021 - 09:15 PM

Measure the amount of crankcase pressure you have. Might just be bad luck. Might be bad rings. Impossible to guess.

#4 sam138

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Posted 13 July 2021 - 09:46 PM

Thanks for the reply, how would you measure the crankcase pressure ? I’ll give the engine a compression test tomorrow and see what the results come out as.

#5 sonscar

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Posted 13 July 2021 - 10:33 PM

There was a manometer which fitted in the dipstick hole I seem to remember,Steve..

#6 imack

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Posted 14 July 2021 - 05:32 AM

It could also be leaking from between the primary gear bushes and the crank due to excess clearance.

#7 GraemeC

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Posted 14 July 2021 - 05:48 AM

Does this mean that the orange oil seal has gone behind the clutch ? I’m struggling to understand why it’s gone as the car was perfectly fine in NA form…

It’s most likely the seal (although as  above there are other possible causes). Failure of the seal is probably unrelated to your supercharger conversion and just bad luck on when it’s happened, although if the car was stood for a while whilst you were doing the conversion it may just have dried out a bit.



#8 sam138

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Posted 14 July 2021 - 10:26 AM

Thanks for the replies, the car has sat for most of the lock down period whilst I've been slowly fitting the supercharger kit, last night was the first time it's been running for 5-10 minutes consistently.  

 

I've done a compression test today ( dry and wet) as per below results with all spark plugs removed and full throttle.

 

Battery showed 12.9-13 volts on multi meter before test. 

 

Dry: 

Cylinder 1 : 97 psi 

Cylinder 2 : 102 psi 

Cylinder 3 : 115 psi 

Cylinder 4: 105 psi 

 

 

With a drop of oil in bore: 

Cylinder 1 : 100 psi 

Cylinder 2 : 100 psi 

Cylinder 3 : 125 psi 

Cylinder 4:   110 psi 

 

 

I've just fitted a decompression plate with new head gaskets and my minispares MSE4 head which has only covered 500 miles or so from when I purchased. 

Compression ratio has been calculated at 8.1. 

 

 

Any ideas please ? 


Edited by sam138, 14 July 2021 - 10:33 AM.


#9 GraemeC

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Posted 14 July 2021 - 10:51 AM

Remove the flywheel, inspect and replace the seal - you're trying to find problems!



#10 sonscar

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Posted 14 July 2021 - 02:27 PM

How much dripping?if it was a few spots when you turned it off and it was mine I would probably drive it until the clutch failed.Maybe try reconnecting the breather.Persevere and you will sort it,engines have been supercharged for eons,Steve..

#11 xrocketengineer

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Posted 14 July 2021 - 09:49 PM

Are you "supercharging" you crankcase also?  



#12 sam138

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Posted 15 July 2021 - 07:37 AM

Many thanks for the replies, I've order a flywheel puller and clutch oil seal tool and will proceed to get the seal changed. 

 

I've order this performance seal from Minispares, will this be ok ? 

13H2934MS - Mini clutch oil seal minispares performance use type.

 

 

I've had around a table spoon worth of oil come out after running the car fully for the first time in a while, I'll try cleaning out and reconnecting the breather over the clutch housing. 

 

I guess I'm going to be in for a new clutch as well ? apart from the flywheel. 



#13 sonscar

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Posted 15 July 2021 - 08:31 AM

I wouldnt dismantle anything until you have proved the crankcase is not pressurising,loads of work and it could fail as soon as you fire it up.In my fiscally poor word diagnosis beats parts cannon every day.Just my views,others may vary.Steve..



#14 sam138

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Posted 15 July 2021 - 10:17 AM

I wouldnt dismantle anything until you have proved the crankcase is not pressurising,loads of work and it could fail as soon as you fire it up.In my fiscally poor word diagnosis beats parts cannon every day.Just my views,others may vary.Steve..

Thanks Steve, I've attached a picture on page 2 showing the crank case breather connected to the carb. Is this the correct way to do things ? prior to the supercharger install the breather over the clutch wasn't connected to anything as the carb connected to the timing cover breather which has now been removed. I added a DSN breather to the original mechanical fuel pump hole to replace the one lost on the timing cover. 

 

Just wondering if it's all linked as when I start the car it idles ok but if I rev it slightly it will stall straight away. 

 

If it was down to the crank case having added pressure and this was resolved is it possible the clutch seal will stop leaking then ? 


Edited by sam138, 15 July 2021 - 11:06 AM.


#15 sam138

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Posted 15 July 2021 - 10:18 AM






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