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Australian Falcons Discuss the australian born and bred models here. Includes the 80's 90's and present day Falcons offered by Ford Oz.

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Old 08-24-2005, 02:04   #1 (permalink)
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XB Falcon coupe

G'day, can anybody help?
Soon after its rebuild (new rings and bearings 3,000km ago) my 351 Cleveland started blowing a little smoke which I thought was rings settling in.
This has got alot worse lately. A compression test shows good compression on all eight cylinders.
Plugs on the right bank (1-4) were dirtier than the left bank of cyls.
No. 4 plug was caked in an oily deposit. (pretty bad)

I'm thinking an oil ring has broken on No 4 piston.
An embarassing amount of smoke leaves the exhaust- is this usual for a broken oil ring?
Anyone?
Thanks
Tim
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Old 08-24-2005, 03:26   #2 (permalink)
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Re: XB Falcon coupe

Did you check the mushroom rubbers ,i think there called that sit over the base of the valve where it go's into the seat ? i have been caught there.
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Old 08-24-2005, 03:52   #3 (permalink)
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Re: XB Falcon coupe

if the valve stem seals - mushrooms- are leaking it will usually be worst when you back off the go pedal.

a broken oil ring would smoke more consistant.
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Old 08-24-2005, 04:37   #4 (permalink)
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Re: XB Falcon coupe

I did think of that when it was smoking only a little,but now I think its worse.
It also was low on oil when I checked- just below add. This doesnt sound good does it. Remember it had good compression, but I'll check that again.

Anyway if it was a rubber, it would probably only be one-could this cause so much smoke?
Thanks for the feedback
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Old 08-24-2005, 06:07   #5 (permalink)
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Re: XB Falcon coupe

Quote:
Originally Posted by 76coupe
G'day, can anybody help?
Hopefully


Quote:
Originally Posted by 76coupe
Soon after its rebuild (new rings and bearings 3,000km ago) my 351 Cleveland started blowing a little smoke which I thought was rings settling in.
Unfortunately, no.


Quote:
Originally Posted by 76coupe
This has got alot worse lately. A compression test shows good compression on all eight cylinders.
So compression rings should be OK then...


Quote:
Originally Posted by 76coupe
Plugs on the right bank (1-4) were dirtier than the left bank of cyls.
Very strange.....


Quote:
Originally Posted by 76coupe
No. 4 plug was caked in an oily deposit. (pretty bad)
This is not good


Quote:
Originally Posted by 76coupe
I'm thinking an oil ring has broken on No 4 piston.
More than likely


Quote:
Originally Posted by 76coupe
An embarassing amount of smoke leaves the exhaust- is this usual for a broken oil ring?
Yep....


Quote:
Originally Posted by 76coupe
Thanks
Tim
No prob.
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