R/R piston rings from underneath?

Hozer 88GTConv · 06-06-2004, 11:31 AM

Okay, I've checked everything else and it has to be a cracked oil ring on number 5.

I recently rebuilt the heads and would prefer to snatch the motor out and pull the pan and r/r the rings on number 5 leaving the top end intact. Really don't want to pull the heads again (gaskets, head studs, etc).

Can I r and r number 5's rings from underneath on an engine stand?

I have never done a ring job and realize that I may have to take it apart anyway and hone it if the rings are really messed up. But it is holding 175 PSI on a compression check and not losing any pressure even after an hour of sitting. So, I think it has to be a cracked oil ring...
I have r/r'd valve seals twice and r/r'd the intake manifold gasket 5 times to make sure it isn't pulling from the lifter valley.
It is only doing this on number 5 and it is pissing me off.
It also NEVER smokes. All other plugs are perfect.

I just need number 5, it's burning a quart every 150 miles and fouling the plug royally. Plus it's killing my idle, f-ing up the octane, and I'm anal.

Thanks in advance...maybe I should just stroke it and be done with it...

By the way, road trip from New Smyrna Beach yesterday I averaged 3900 RPM with 3.73's on my T-5 in 5th. The needle was buried so I have no idea have fast I was going. If the needle is calibrated past 85, I had to be averaging 105-110 for the better part of an hour.

7K331 · 06-06-2004, 07:15 PM

Nope, the crank will be in your way. If you have to pull the crank I would just pull the one head & do it from the top.

LX5liter · 06-07-2004, 08:04 PM

Even if you could weasel it around the crank, it would be a real bitch to get the rings compressed to go back into the bore from the bottom side.

06-06-2004, 11:31 AM	#1
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	R/R piston rings from underneath? Okay, I've checked everything else and it has to be a cracked oil ring on number 5. I recently rebuilt the heads and would prefer to snatch the motor out and pull the pan and r/r the rings on number 5 leaving the top end intact. Really don't want to pull the heads again (gaskets, head studs, etc). Can I r and r number 5's rings from underneath on an engine stand? I have never done a ring job and realize that I may have to take it apart anyway and hone it if the rings are really messed up. But it is holding 175 PSI on a compression check and not losing any pressure even after an hour of sitting. So, I think it has to be a cracked oil ring... I have r/r'd valve seals twice and r/r'd the intake manifold gasket 5 times to make sure it isn't pulling from the lifter valley. It is only doing this on number 5 and it is pissing me off. It also NEVER smokes. All other plugs are perfect. I just need number 5, it's burning a quart every 150 miles and fouling the plug royally. Plus it's killing my idle, f-ing up the octane, and I'm anal. Thanks in advance...maybe I should just stroke it and be done with it... By the way, road trip from New Smyrna Beach yesterday I averaged 3900 RPM with 3.73's on my T-5 in 5th. The needle was buried so I have no idea have fast I was going. If the needle is calibrated past 85, I had to be averaging 105-110 for the better part of an hour. __________________ 1988 GT Convertible 331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta... One week with new motor, two speeding tickets...joy

06-07-2004, 08:04 PM	#3
LX5liter dude5l Join Date: May 2001 Location: Grande Prairie, Alberta, Canada Posts: 603	Even if you could weasel it around the crank, it would be a real bitch to get the rings compressed to go back into the bore from the bottom side. __________________ Good luck! Brad R. 1992 L.X. 5.0 coupe MODS: A few little bolt ons New Best time ...11.60 @ 128 mph @ 2000+ ft altitude. Rice Haters Club member #39 Users rides #2542

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06-06-2004, 07:15 PM	#2
7K331 Registered Member Join Date: Apr 2004 Posts: 15	Nope, the crank will be in your way. If you have to pull the crank I would just pull the one head & do it from the top.