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| Exhaust Manifold gasket issues https://www.ausmini.com/forums/viewtopic.php?f=2&t=69861 |
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| Author: | diecast [ Fri Apr 01, 2011 9:56 am ] |
| Post subject: | Exhaust Manifold gasket issues |
I've burnt through my 2nd exaust manifold gasket in about 200 miles. This is the gasket between the head and the extractors. Centre exhaust port burnt through - Maniflow extractors on a 1275, standard size ports. Last gasket change i did all the right things: cleaned all the faces on extractors and head made sure everything was flat (cleaned up with a flat file) new standard type gasket (grey with metal insert) installed dry ensured everything was seated properly when doing up. retighted nuts after warming up retighted nuts after a drive Looking for ideas, what are others doing with success? VHT Copper coat?, smear of hi-temp silastic? anything else? Novelty of doing gasket changes is wearing off. Diecast |
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| Author: | simon k [ Fri Apr 01, 2011 10:17 am ] |
| Post subject: | |
did you measure the thickness of the manifold flange on the extractors against the inlet manifold flange and make sure the washers were thicknessed accordingly? I had that trouble and I think I ended up getting the extractors ground flat and the same thickness top & bottom |
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| Author: | drmini in aust [ Fri Apr 01, 2011 10:33 am ] |
| Post subject: | |
1. Maniflow LCBs- the middle flange is not flat, or in the same plane as the end ones. Usually. Cure- grind/file it flat. I bolt it to an old head with no gasket, then check around with a .002" feeler gauge. 2. There are better manifold gaskets- Unipart do a turbo one with metal rings on the exhaust ports. See Mini King or Karcraft. |
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| Author: | diecast [ Fri Apr 01, 2011 12:01 pm ] |
| Post subject: | |
every thing looked ok as it went back together, inlet manifold and extractor flanges same thickness etc metal ringed gasket sounds good. Installed dry? or with any type of goop/copper coat/loctite etc. Thanks for the help guys |
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| Author: | GT mowog [ Fri Apr 01, 2011 12:10 pm ] |
| Post subject: | |
Might seem un-related but is your ignition timing right? |
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| Author: | diecast [ Fri Apr 01, 2011 12:41 pm ] |
| Post subject: | |
Ignition is ok, starts easy, no pinging, runs strong to 6500, fuel mixture, engine temperatures good, RC40 exhaust etc. If i was having issues here, then yes ignition timing might be an issue. Seems to me to just a direct mechanical issue Both gasket problems have occurred at the end of track days. 1st Gasket failed after 3 track days, 2nd gasket failed after 3x sessions at a track day. |
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| Author: | diecast [ Fri Apr 01, 2011 1:01 pm ] |
| Post subject: | |
Just looked online and seen a picture of the turbo exhaust gasket, looks like it will do the job, thanks doc |
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| Author: | Lillee [ Fri Apr 01, 2011 1:28 pm ] |
| Post subject: | |
I'd get out the verniers and measure all the flanges. A few mm either way will stuff things up. Make sure you use the proper thick exhaust manifold washers and new nuts (don't cost very much from minis.com.au, in fact I think they sell a whole set). Manifold gasket mounted dry. I've never had problems with std gasket when done properly... |
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