Discussion in 'Tech & Repair' started by zzyzzx, Apr 4, 2019.
Here is the used exhaust manifold gasket pics:
This is the engine block top partially cleaned up. It's not warped, so it doesn't need to be planed. Yes, I checked with a straight edge and feeler gauge. My question is if a green pad on a drill will be sufficient at this point? The only thing that I might want to lightly sand is the slightly raised rusted parts around the edges (or would a brass brush drill attachment be appropriate?):
Possibly, they're cheap just go ahead and replace with Motorcraft one since you're this far in.
More like probably leaking, already got the old one out, and the connector cleaned (was an oily mess). This will be the first part replaced.
It's best not to use a power tool to clean or buff the surface of the block, since it's possible to make grooves if the abrasive pad lingers in one place.
Elbow grease is the way to go with it. Just pay close attention to the rings around each cylinder to make sure there's no high spots, that is the most difficult place to seal. By lightly running your finger over the surface you will be able to feel very minute imperfections.
Years ago I was at the "Exploratorium" in San Fransisco and was amazed to find out, on one of their interactive exhibits, that it was possible to feel a step of a tenth of a thousandth or an inch on a polished surface.
I thought that this was informative:
I am having issue with the exhaust manifold gasket remnants being stuck to the exhaust manifold. It's as if parts of it have welded to the exhaust manifold. It's in the area around the bolt holes.
Any suggestions on how to remove this part?
I use emery paper or a flat file. A sharpening stone might also work okay.
Ended up getting that exhaust manifold surface cleaned up.
Once I really looked at everything carefully, I realized that the missing part of the exhaust manifold gasket was really on the cylinder head side, not exhaust manifold side. That and it corresponded to the spark plug well drain holes previously mentioned, so apparently this is nothing and I can move on.
Is this exhaust manifold surface good enough to reuse as is, or do I need to do something:
When you remove the bolt, how far did the exhaust manifold move? I'm wondering if I should pad the radiator and engine block.
Is this cleaned up good enough in the exhaust manifold mating area?
Cleaning up after two long term oil leaks has been quite a job!
That oil pressure sending unit and valve cover leaks have been going on for quite some time! The valve cover was leaking in the area behind the alternator. There is a spot of the top of the cylinder hard there where it's not straight (drops off a little there and I can fit my feeler gauge there).
And recommended method to prop up the cylinder head like that so I can clean the underside?
I use a flat bench top, with a thick layer (double) of corrugated cardboard. Anyway I set the head on that surface, it wont hurt anything.
I'd use a medium/large brass wire brush to get rid of the rust and deposits on the flat surface without damaging the cast iron. I'd also check it for overall flatness/warpage.
I will assume that the cylinder head part itself where the exhaust manifold mounts to was cleaned well enough then.
OK, I tried cleaning up the exhaust manifold mating surface. Prepare to be underwhelmed:
I don't know what I can do to make it better unless I buy a new one or sand it some more. I am only looking to make the mating area around the exhaust holes good for when it seals against the cylinder head. This thing is never going to look good unless I remove it completely and have it planed or outright replace it. It wasn't leaking before so this shouldn't require a lot of work.
Here is the bottom of the cylinder head partially cleaned up. I am using a gasoline soaked green pad, and it's going to take a while:
Here is a close up of the part where the leaking occurred (lower left of picture):
I wouldn't fret too much about the exhaust manifold surface, so long as it's fairly smooth when you run your fingers over it.
I would use dish soap and water instead of gasoline for scrubbing to save my hands, it should work as well or better than gasoline.
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