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Old 09-06-2006, 06:43 PM
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Flathead V8 problems

Alright, see if there are any flathead gurus, i'm working on a 51 mercury and it has the v8 flathead, i rebuilt the carb and we started it up(started right up.....points for me building the carb)
and immediatly started this awful knock like it going to throw a rod out the side(owner said it didn't do it before)

So i do a compression check , all cylinders at 135-142psi except for the front #1, it has 0, doesn't even push on the thumb or anything

So now i'm trying to figure out what next, i was looking in the cylinder and it looks like the intake valve isn't opening(its not moving at all maybe stuck open? doesn't really explain the knocking tho)
I put some oil in there to see if it would seal the rings up, but still zero compression

I don't think its a head gasket because the cylinder next to it is fine, and there is no water in oil or water in cylinder or oil in coolant.

I'm thinking a valve train issue or rings? leaning towards valves

any word from the experts?



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Old 09-06-2006, 09:40 PM
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It's funny how the owners didn't hear that terrible knock before! Why was it brought to you? If the noise is that loud it surely isn't a valve. At most you would get a noisy "Tick". No compression and loud noise, usually adds up to a piston/rod type problem. Anyhow, you are going to have to pull the head.. Good luck
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