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Discussion summary
YOUR RESEARCHScratches at thermostat
Reported repair
Use green scotch pad
Reported resolution
1
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0
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1
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Reported fix
I used a green Scotch pad to clean the surface when I did mine last month. It did the trick.
Leading evidence: 'Use green scotch pad' (1 discussions report resolution; 0 report an unsuccessful attempt). Across 1 matching discussions, The most frequently discussed action is 'Use green scotch pad' (1 discussions). For that action, 1 discussions report a resolution and 0 report an unsuccessful attempt. The most frequently reported fix is 'Use green scotch pad', supported by resolution reports in 1 discussions. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed · Original poster
I estimate that the previous owner used paste to seal better instead of a gasket.
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Suggestion
Make sure to spray out the bolt holes with brake clean and blow them out with compressed air, and clean all fasteners.
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Suggestion
Most of the time Metal gaskets require flat clean imperfection free mating surfaces to seal correctly.
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Hi
currently sitting in the garage and replacing the water pump and thermostat. When removing the thermostat I noticed that there was no gasket, instead some kind of paste was used. After cleaning the surface I saw
scratches. I estimate that the previous owner used paste to seal better instead of a gasket. what do you think, gasket or paste?
How about both, aviation gasket sealer and gasket.... that looks like someone use a pneumatic gasket scrapper on aluminum, a big no no. something I have seen in the field a few times.
Good pics...
Your assessment seems correct. As from looking at your pics its a toss up if the metal gasket even sprayed with 'copper coat spray a gasket' or any sealant, would seal with those imperfections in your pic. But hard for me to tell without being there to 'feel their depth. Can you catch a finger nail in those lines in the sealing surface..?
There are aftermarket paper gaskets available for this application if you wanted to try that route with sealer..?
Might work fine with a metal gasket or paper gasket and sealer
But why chance using a metal gasket that can be fussy to get sealed, if one wasn't used before and it sealed up tight with just gasket maker/sealant. Most of the time Metal gaskets require flat clean imperfection free mating surfaces to seal correctly.
2 ways to do this imho.
1) if the t-stat wasn't leaking/seeping before you removed it, then you can go the easy route.
Just clean spotlessly both sealing surfaces and apply the appropriate sealer/gasket maker of your choice, many good ones out there.
tighten bolts down evenly and let sealer cure fully before filling. This will probably work fine if it did not leak prior. Not sure of its longevity in the case of a overheating event down the road, without the gasket, but probably will be fine... Do not over apply sealant till it squeezes out excessively into the coolant passages. The correct amount of sealant will just be visible at the juncture of the mating surfaces without it squeezing out.
2) Get a flat stone medium grit and a fine stone, both big enough to cover the entire sealing surface of t-stat mount. Apply light to moderate pressure on stone wet with wd-40. Keep surfaces wet. Clean stone and surface frequently. Make sure to use circular motions on stone covering complete surface. Goal is to rid the sealing surface of the scratches/imperfections in your pic. Or get as close as possible to that. But you must surface the whole thing not only concentrating on the imperfections... Do the same to cover till both are flat and perfect. Then evenly finish them both off with the fine stone. Make sure to spray out the bolt holes with brake clean and blow them out with compressed air, and clean all fasteners. Then use the correct metal gasket sprayed with copper coat, for the correct Porsche assembly.
Your choice, I'd do # 2 myself just because I'm good at that type of thing, have the stones in my part washer tank already, and like to use gaskets when manufacturers require them.... neither way is wrong as long as you get it to seal up tight no seeps pressure tight...
jmo
