76coupe

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

landau37

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.

351cid

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.

76coupe

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

RPO-083

Hopefully


Unfortunately, no.


So compression rings should be OK then...


Very strange.....


This is not good


More than likely


Yep....


No prob.