my ford 8n smokes and also runs rough but i took the oil cap off and put my hand over oil fill and it ran perfect but when i take my hand off it runs rough it also is leaking black liquid around manefold i am not sure if its oil or gas or both. ps i just replaced the piston rings.
- Thread starter redmanz
- Start date
old
Well-known Member
- Location
- Camdenton Missouri
You just replaced the rings did you mike the sleeve or did you replace them?? If you miked the rings where they with in spec?? Did you hone them?? How long have you had it running since new rings there is a break in time. Is the smoke a blue or black smoke?? If black carb maybe set to rich or the air filter needs to be serviced. If blue rings may not be broke in yet
Janicholson
Well-known Member
Changing the crankcase vacuum by doing what you did is interesting. Very worn valve guides, or worn piston ring grooves, or wrong piston rings (openring end gap) or stacked gaps in the rings, are possible reasons. Maladjusted mixture is also possible. what Old asks is critical. JimJim
gene bender
Well-known Member
You should have honed the cycl walls
old
Well-known Member
- Location
- Camdenton Missouri
Not honing the cylinder is very likely to be where the problem is. You need to break the burned on glaze that is in the old sleeves for the new rings to seat like they should
In the old days, [or even now days?] some one might suggest fogging it with 'bon-ami'[sp] the 'won't scratch glass' powdered cleaner- I've heard about this for seating rings in the past, mostly cuz I am from the past---LOL don't have a clue, but be interesting to know if anyone else has?
47fivewindow
Well-known Member
- Location
- Davidsonville Md.
when I was at IH we rebuilt an 806 that smoked. The shop foreman shook Bon ami into the air intake . It settled down and we sent it out the door. Never came back. I am still amazed 40 years later.
Adirondack case guy
Well-known Member
You took the words rite out of my mouth. Was going to sugest Bonami ingested through the intake to seat the rings.
We resorted to that in several deisel engines that were not worked and run cool during the break-in period.
Loren
We resorted to that in several deisel engines that were not worked and run cool during the break-in period.
Loren
Richard G.
Well-known Member
Cat used to sell an abrasive powder to feed into the intake to seat rings when the engines started burning oil.
Richard in NW SC
Richard in NW SC
I put new rings in my 50 8n. had trouble starting it and when it did it smoked as bad as it did before I put rings in it. I called a friend of mine who is a very good mechanic and he told me to put some oil in each cylinder and run it for 2 hours. He told me that rings has to have enough time to conform or seat into each cylinder wall if you haven't put new sleeves in it. Well I did and about after 30 minutes I noticed the smoke started backing off. After an hour is really backed off. Now the only time is smokes it when you give it the throttle then stops. I haven't run it with a brush hog yet so I don't know how it will do then but for now it seems to be okay. The oil cap is interesting. Maybe you have so much blow by that your compression is so low it makes it run rough. By plugging up the oil cap it forces the compression to go up. Just a guess. Don't know if that will help you or not. Just my 3 cents worth.
dr sportster
Well-known Member
The cross hatch pattern is what seats in the rings. Some time back someone posted a service manual page about using Comet to seat rings. At this point you have nothing to lose. After all it wasn't some guys on the internet but a service manual . Like silver paint on a head gasket -- another found in older manuals.
Gene Davis (Ga.)
Well-known Member
Bon-Ami(sp) is the best ring seating powder. Some dealers will have packets of break-in powder and that is a factory version of a light powder that will put minute scratches in the glaze to let the rings seat.
dr sportster
Well-known Member
I'm just saying the service manual the guy posted said Comet. Also there are too types of Bon-Ami . One is for glass one is not.
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