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I sounds like one or more of the torque converter bolts is hitting the block plate. That is a tinny/sheetmetal sound more than a knock. That's what leads me to think something is hitting the block plate.

 

Hmm, that means I have to take off the tranny of the engine anyway. Well I know what to do coming weekend. That 's what I thought in the first place.

thx for the comment.

Eric

 

There is a ring that goes between the flexplate and the crank. If it's not there the TC will be a hair too close to the block plate.

 

If we are thinking of the same ring, it goes on the back side of the flexplate, under the bolts, used to help distribute the load and prevent cracks.

For the OP, looks like something is definitely rubbing on your flexplate. Is that the only location? When you turn it by hand, does it hit in more than one location or is that it? Strange...

 

...If anyone has any ideas, before I take the tranny out, would be great...

Maybe the fan blades are hitting something? That's what it sounds like to my poor hearing.

 

I thought that too... Specially at the end there. But so hard to tell.




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Have you pulled the starter and checked it for similar grind marks? You might have the wrong starter for your flywheel.

 

Like your car. Great stance and the black steelies look good.

 

I had a simular noise installing my new engine during first startup. Mine was worse and ended up being one of the bumps on the block plate was touching. A lot of noise for a little rubbing. For me I just ground off some of the block plate bump to clear...done deal. Yes you must pull trans.

 

Did you by chance have a starter go bad? Back in the day I had a starter go bad andPieces of it were laying on the bottom of the bell housing. And occasionally when I started the car pieces of metal would hit the flex plate. The sound was like a plastic cookie tray crumbling. It's was nasty.

 

I hear what sounds like a small exhaust leak on acceleration and the noise right at the end is the water pump pulley against the belt when decelerating and shutting down. The belt slows down faster than the pump, which wants to keep turning from inertia.

 

This is what I heard too.

 

thx for the messages. We will take off the tranny this week to check.

For sure we know that it is nothing connected to the belts, as the noise is still there with the engine running without any belt. Exhaust leak neither. We checked all that. As stated, we eliminated everything except for the starter and the flexplate.
If we found it, we will post the solution here.

Anyway, thx for all your comments so far.

 

Sounds like flex plate hitting the block plate. I had car brought to my shop with the same noise, & what I found was he torque converter had 2 drain plugs & the flex plate had 1 drain plug hole. So, basically the torque converter was pushing the flex plate out a little on one side. I slid the trans back enough to grind off 1 of the heads on the torque converter drain plugs(as there were 2 of them,) slid the transmission back into place and It worked. Some torque converters have 2 drain plugs & the flex plates only have 1 drain hole provisions. Good luck & let us know what you find to be the problem.

 

You could always use a brush and paint the area(s) in question on the plate and then run the engine. Shut it off after hearing the noise and then recheck to see if the paint is smeared/knocked off.

 

I just did the trick with the paint. Then started up and checked. The noise is still there and the paint is not scratched, so it is not the small damage on the picture. Just to be sure, I took off the valve covers as well, but also there all is fine. I'll try to check it this week with a stethoscope to locate the noise exactly. But it is late here now in Belgium and I don't want to wake up the neighbours with the double cherry bombs..lol..
Keep you posted.

 

You probably already checked this but it sounds like the fan to me.

 

If you read the whole topic, you will see that it is not the fan. Tomorrow I will have a stethoscope to locate the noise exactly. We focus now on the bellhousing, checking if the torque converter is correctly installed.

 

If you have a stick, like a broom handle that is cut off, you can use that as a stethoscope also. Long 3/8" extensions work also, pretty much any straight rod will work that you can place to your ear

 

Curious, what's your oil pressure?

 

small update: We have located the noise. It is coming from the flexplate. Yesterday night I started with the preparations to take the trans off. Tonight I will remove it with a friend of mine. Tomorrow I will post the results.

 

Funny thing. I was watching Starsky & Hutch last night. Starsky was driving the Torino through an abandoned Zoo looking for a person. It was only him in the car and You could hear the engine pretty clear through the audio, the engine was clicking loud enough where you could hear it clear as day. I know that is a 351W, but funny how loud the clicking was.
Must be the one where they have run the dog out of it.

 

Tonight we took off the <ACRONYM title=transmission><ACRONYM title=transmission>trans</ACRONYM></ACRONYM> from the engine and found the casue..The bellhousing separator was damaged. Some amateur grinded off the plate on several edges and it was broken. That caused the noise. The flexplate was still ok and the shim was in place as well. So only have to buy a new bellhousing separator.

Here are some pics.

 

Here is another pic.

 

That looks like someone tried to make a chevy starter fit on his Ford engine!

 

Wow. Wonder what the heck they were trying to do!

 

Yeah, I know you already found the noise.....
When the bendix goes out in the old style starters you get a noise just
like that, but under heavy acceleration. It's a PITA to figure out. Sounds just like
a low octane ping.

Glad you figured it out.

 

I did some research on the nr. They installed the wrong plate. It was a plate for an AOD form the eighties. ANd then they tried to fix it for a C4. Man, what an amature was that. Anyway, I'm glad we found it. I ordered a new correct plate for a C4. I'll let you know when it's finnished.

 

That was a good catch and glad to hear you found it. Some of the things people try and do to these cars seem really odd. There are probably a dozen parts suppliers that sell the proper backing plate that you need. It seems like some people work on the concept that if it doesn't fit, just make it fit somehow.

 

Just to let you know that the issue is solved. After mounting the correct plate and put everything back together again, we started the engine and the noise is gone!
thx for all your help.
Eric