Bad day

C

chicknlittle

Member
Well I was cleaning my head surface on my motor and thought I would remove the carbon off the piston when I found one piston with dings and a chip in it.I was trying to stick with in my buget but looks like a complete tear down now lucky theres no scoring in th cylinder. Man I want to get the merc on the road.Jimmy
 
Jimmy, no matter if you're working on a house, a bicycle, a car, or a boat, the further you take it apart, ...the more bucks it costs to put it back together again.
You might examine the dings and the chip, they might be old damage?
 
Where are the dings and chips located? Can you show a picture? It might be nothing much to worry about if we could see where the damage is.

Jack E/NJ
 
Has the corresponding cyl head got marks/dings in it? Can you see the top ring?, can you detect movement rocking the piston side to side? Basically, if it ain't broke, don't fix it. You need to determine, as others have suggested, whether or not this is previous damage that has been remedied or if it is broken rings etc. Pictures sure would help us all make a better diagnosis
 
I can't seem to get the pic up
 

Attachments

  • jpg.gif
    jpg.gif
    183 bytes · Views: 430
Jimmy, under the text box, hit the "Go Advanced" button.
Then scroll down and hit the "Manage Attachments" button.
In the pop up window, hit a "Choose File" button.
The next window will display everything on your desktop... or, from a location you select on the left side of that box.
Select one, then hit "Choose".
Hit "upload" from the next window.
Hit "Preview Post" to check what you've done.

There are other ways, this is just one way.
By the way... I have a MAC, so it might be different for a PC.
 

Attachments

  • img043.jpg
    img043.jpg
    80.3 KB · Views: 52
cnl
When replying click on go advanced.

Go to manage attachment & open.

click on browse. It should bring up all you saved stuff. Scroll through and find where your pic is stored & click on it then select open.

It will appear in the browse box.

Select " upload".

hope this helps

GB
 
If you're still having trouble and can attach pictures to an email, you could send them to someone who knows how to post them here and we can post them for you. Just a thought.
 
I wouldn't be afraid to run it as long as the edges of the piston are not chipped out. I had a hot rod buddy from when we were 16 that has a son that bought a 35 coupe 12 years ago that called me to take a look at his engine. One piston had nicks and dents and a hole about 1/8" in the center. Broken ectrode went through it. He just wanted to drive it a while and fix it when he got some money. I drilled the hole out, tapped it and counter sunk the hole slighly. Put an aluminum screw in with red lock tight, cut the screw off and peened the top of the screw down flush. The engine is still running good after 10 years and he drives it a lot. G.M.
 
When I was younger I had a piston in a one lung BSA motor cycle lose a ring and score the barrel. I was going to replace the barrel and an old time mechanic said I did not need to-just put it back together and the scratches will carbon up. He was right-I ran that bike for a lot of miles before I got rid of it. I think the same thing will happen with the pistons-they will carbon up and you won't notice the difference-one caveat-as long as the pistons are not cracked and in danger of coming apart. If they are surface scratches-put it back together and run the sh** out of it.
 
I think you'll find your top ring is broken and little pieces have worked up on top of the piston. That usually wears a gourge in the cyl wall. Walt
 
Chicknlittle, congrats on posting the photo! Like they say, they can tell a thousand words. This story doesn't look good to me. More because the edge of the piston dome than because of the marks on the top. I bet this cylinder doesn't develop the correct compression, not that you can check it now.

Have you ever seen the engine run?

Is the head buggered up?

Is this the only place of concern?

I don't think you've said if the engine is out of the car?

-VeryTangled/Jeff
 
i hate to say this but i wouldnt run that piston, i would pull the pan and remove that rod and piston, find a good used piston or call egge machine and order a new piston and rings, that is the cheapest way out and will probably run forever, some one on here probably has a good one from one of there engines,
 
Looks like someone dropped a small nut or bolt into the carb and the engine spit it out the exhaust. If I had a tight budget, I would run the engine as is. I don't think that the ring is coming up into the chamber in pieces to destroy the engine.
 
Well since the motor is out and the heads off I might as well change it I already have another set of pistons that came out of my first tear down.I will hone and and put new rings in all 8 cylinders Thanks for all your help
 
if the engine ran good and didnt burn oil i would just replace the bad one, the reason i wouldnt run the one in there is because of the missing pieces on the edge of the piston, sharp edges on the chips cause hot spots and it wouldnt be long before there will be a melted spot going down the piston from hot gases, my guess is what every broke the chips out of the pistons those pieces went up into the cylinder and caused all of the pits on top of piston,
 
You must log in or register to reply here.
Back
Top