Do your pistons look like this? - Ford Bronco Forum
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post #1 of 22 (permalink) Old 05-06-2009, 07:44 PM Thread Starter
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Do your pistons look like this?

Finally took off my heads today, and look what was in store for me:

-i blame the p.o.







you guys ever seen this kinda shit??
you suggest a rebuild? lol

think about it. seriously.

1989 Bronco Eddie Bauer. rebuilt 351W. C6. 3"Body. 35" Procomp m/ts. Warn hubs. oil/temp/volt gauges.
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post #2 of 22 (permalink) Old 05-06-2009, 08:50 PM
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well its not THAT bad but yes it could use a rebuild(including new pistons) and a good honeing


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post #3 of 22 (permalink) Old 05-06-2009, 08:52 PM
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Originally Posted by yoomooman View Post
well its not THAT bad but yes it could use a rebuild(including new pistons) and a good honeing
x2

what were you expecting them to look like?

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post #4 of 22 (permalink) Old 05-06-2009, 10:10 PM
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Not too bad, I've seen a lot worse. Agree with the rest, good honing and rebuild is in your future.
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post #5 of 22 (permalink) Old 05-06-2009, 10:42 PM
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Does not look too bad. Just some detination mixed with alittle oil always seems to leave a stain. I would not necessarily go buying new pistons just yet. Do a good honing and new rings and refurbish the pistons with some elbow grease and should come out real nice.
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post #6 of 22 (permalink) Old 05-06-2009, 11:11 PM
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Originally Posted by g8rfan View Post
Does not look too bad. Just some detination mixed with alittle oil always seems to leave a stain. I would not necessarily go buying new pistons just yet. Do a good honing and new rings and refurbish the pistons with some elbow grease and should come out real nice.
X2

If I can just get it out of here I can fix it.
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post #7 of 22 (permalink) Old 05-06-2009, 11:19 PM
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Quote:
Originally Posted by g8rfan View Post
Does not look too bad. Just some detination mixed with alittle oil always seems to leave a stain. I would not necessarily go buying new pistons just yet. Do a good honing and new rings and refurbish the pistons with some elbow grease and should come out real nice.
X3

I bet if you clean those pistons up they will look fine. The good news is what I can see of the cylinder walls they look great. Good Luck with your build.
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post #8 of 22 (permalink) Old 05-06-2009, 11:25 PM
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It looks to me to be running alittle lean instead of rich or is running a hot plug by the grayish tint on the surface of the piston. Not really that black. They do show a good center flash point burn. Good tell of that is the center of each piston alittle shiny and relatively clean and how the oil burn is in a good circle pattern on the outer side of the piston surface.
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post #9 of 22 (permalink) Old 05-06-2009, 11:33 PM
Try it now!!
 
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post #10 of 22 (permalink) Old 05-07-2009, 12:21 AM
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Unless it looks like this, I would not worry to much



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post #11 of 22 (permalink) Old 05-07-2009, 12:24 AM
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Originally Posted by broncoflorida View Post
Unless it looks like this, I would not worry to much



Why be worried with that? You should of gained at least 20 more horses with a piston looking like that. And with that access to the ring like that, just makes it easier to change out the ring without pulling out the piston.
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post #12 of 22 (permalink) Old 05-07-2009, 12:58 AM
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Doesn't even look like there is a ridge at the top of the cylinder. If you run your fingernail toward the top where the rings tops out, how much of a ridge is there? It is a good inicator of how much wear you have on the cylinder walls. Almost looks like there are hone marks on the wall still.

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post #13 of 22 (permalink) Old 05-07-2009, 01:12 AM
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Yeah, this is what a bad piston looks like:



Actually, the piston itself is fine, except for where it was hitting the crank. just the conn rod bent.
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post #14 of 22 (permalink) Old 05-07-2009, 11:53 AM
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Check the sparkplug wire for that cylinder, or you may need to step down on the plugs.
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post #15 of 22 (permalink) Old 05-07-2009, 03:17 PM
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Shoot, that isn't even dirty. Check out the gunk I had in my lifter valley at 130k. Thanks to the P.O. and a life of cheap oil and most likely infrequent changes ...


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post #16 of 22 (permalink) Old 05-10-2009, 01:15 AM Thread Starter
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ooohhh man was i worried.. you guys suggest i just get new rings an hone the walls?
cuz thats the cheap way, n too me sounds like the best way :)

i was worried at first bout the pistons but thanks for makin me feel better

think about it. seriously.

1989 Bronco Eddie Bauer. rebuilt 351W. C6. 3"Body. 35" Procomp m/ts. Warn hubs. oil/temp/volt gauges.
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post #17 of 22 (permalink) Old 05-10-2009, 01:50 AM
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Originally Posted by c_bko89 View Post
Finally took off my heads today, and look what was in store for me:

-i blame the p.o.







you guys ever seen this kinda shit??
you suggest a rebuild? lol
picture 2 looks like you have had some water get into it. Check your rods when you pull it apart.
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post #18 of 22 (permalink) Old 05-10-2009, 01:57 AM
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That's not horrible at all.

It's hard to see if there's a ridge or not on the cylinder walls. Generally if they catch your fingernail then it's a good idea to bore, hone and go oversize.

If not then a simple light hone and new rings should be fine.

When the pistons are out you can sandblast, wire brush, or scrape all that carbon off them. Just be sure to wrap duct tape around the skirts so you don't accidentally damage them.

Good luck!

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post #19 of 22 (permalink) Old 05-10-2009, 02:45 AM Thread Starter
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Quote:
Originally Posted by Winder View Post
picture 2 looks like you have had some water get into it. Check your rods when you pull it apart.

what should i look for?
this is my first time pulling my motor.. think that refreshing the pistons, honing and new rings all i need to do?EDIT: cuz im a broke @$$

+i'm gonna get reman. heads

Quote:
Originally Posted by ValkariaKid View Post

It's hard to see if there's a ridge or not on the cylinder walls. Generally if they catch your fingernail then it's a good idea to bore, hone and go oversize.

If not then a simple light hone and new rings should be fine.


i felt w/ my nail, an there's really no ridge on top of the engine block or on the cylinder's... my nail didn't catch and i couldn't feel a ridge on most of the cylinders..

as far as honing goes-- HAYNES suggest using "bottle nose" honing style tool... any one have expericence w/ this?

think about it. seriously.

1989 Bronco Eddie Bauer. rebuilt 351W. C6. 3"Body. 35" Procomp m/ts. Warn hubs. oil/temp/volt gauges.
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post #20 of 22 (permalink) Old 05-10-2009, 05:47 AM
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Hope you don't mine a bronco newbie offering help, I have been tinkering with engines for 20+ years, V8's and aircooled VW's. I really don't know anything, so this is only meant to help.

Quote:
Originally Posted by c_bko89 View Post
what should i look for?
rods not bent, not twisted, not black, just a healthy oil stained color

Quote:
this is my first time pulling my motor.. think that refreshing the pistons, honing and new rings all i need to do?EDIT: cuz im a broke @$$

+i'm gonna get reman. heads
When you pull your pistons check your cylinders all the way down their bores. If everything looks ungouged and all moving parts are getting along a refresh could give several more years of service. Broke budget quality = clean and reuse a lot of parts. Fresh heads means you want fresh rings also or good sealing fresh heads would put added strain on worn rings. If anything you could save money on the heads for now by doing a liquid valve seal integrity check and if need be lap the valves for a few more years of running, unless the guides are gone.

Quote:
i felt w/ my nail, an there's really no ridge on top of the engine block or on the cylinder's... my nail didn't catch and i couldn't feel a ridge on most of the cylinders..
That is good. Carbon around the top is normal but it should come off with a cleaning and some solvent to dissolve the carbon. I have seen ridges so bad you could almost lift the block with your fingertips catching them.

Quote:
as far as honing goes-- HAYNES suggest using "bottle nose" honing style tool... any one have expericence w/ this?
I have never done this much, too skeered. Plus what a shop would charge for a cyl hone is close to what the tools would cost if you skip the hot tank and mag checks and did all your own cleaning.

Let your wallet be your final decision maker!
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