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Re: piston ring installation on 96 geo 1.3 liter 4 cyl...
If you are that deep into things you will do poorly without a good manual. Are the pistons new or used?If they are used you need to completly clean the ring grooves in the pistons or the new rings will stick and gall.Did you remove the ridge at the top of the cylinders? If not there is a good the top ring will either break or bust the upper land off of the piston. Hopefully you had a machine shop go through the block. Check the ring manufacture's web site. I am sure they will have tips and instructions.
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erratic compression indicates a cam lobe problem or cam follower problem
with that many miles on it , the cam shaft will have wear on it but the rest of the motor will have considerable wear including possible ring problems on the numbered pistons
If the body is rust free consider a new -out of the box engine as a cheap plug to stop the repair waste of money
There are at least three possible reasons for no psi in cyl No 4.
1. Burnt or damaged exhaust valve in that cylinder
FIX Remove head and replace faulty valve
2. Blown head gasket (water mixed with sump oil shows milky on dipstick and steam or water coming out of exhaust tailpipe, radiator water disappears )
FIX Remove head, grind flat and assemble with new gasket.
3. Broken piston rings, or cracked piston or burnt hole in piston.
FIX replace faulty parts.
Squirt some sump oil ( 2 or 3 spoonfuls ) through spark plug hole,
spin motor , and if compression PSI improves then it is rings or piston, if no PSI then it is faulty ex valve !!!
I think this TSB will solve your problem even know your car is older.
NO: 18-05-96 Rev. A GROUP: Vehicle Performance DATE: May 24, 1996 SUBJECT:
**Intermittent Rough Idle** NOTE: This bulletin
supersedes technical service bulletin 18-05-96 dated February 16, 1996
which should be removed from your files. The subject description was
printed incorrectly and is marked with **ASTERISKS** MODELS:
1991 - 1995
1991 - 1993
Dynasty/New Yorker/New Yorker Salon
1991 - 1993
1991 - 1995
LeBaron Coupe/LeBaron Convertible
1991 - 1994
1991 - 1995
Caravan/Voyager/Town & Country
NOTE: This bulletin applies to vehicles equipped with 2.2 liter and 2.5 liter engine and high pressure throttle body fuel injection. SYMPTOM/CONDITION:
An intermittent rough idle may occur during cold engine operation,
within 3 minutes after engine start up, in rainy weather and
temperatures of approximately 30° to 50°F. PARTS REQUIRED: QuantityPart NumberPart Name
Idle Air Control Motor (IAC)
Remove A/C motor.
Install new IAC motor (P/N 4288298) and rubber O-ring, torque to 2 Nm (17 in. lbs).
CAUTION: The rubber o-ring must be installed with the IAC motor for proper operation.
I would also recommend doing a fuel pressure test to see if it loses fuel pressure overnight.
Depending on the mileage, worn piston rings are the most likely cause. There are also numerous places on these engines that leak - valve cover gasket, distributor seal, cam seal and oil pan are the most common. You can try a heavier weight oil the next oil change. If you're current using 10W30, try switching to 10W40.
broken/worn piston ring(s). Each piston has 2 rings. These can be replaced by the DIY mechanic by 1) removing head of engine (remove head gasket - you'll replace it), then 2) manually wind the engine (with a ratchet wrench & socket) til the piston in question pops up 3) remove both rings (with ring pliers - available from any auto parts store) 4) install 2 new rings (with a ring installation collar - available at any auto parts store) --- choose ring installation tool to the correct size for your pistons. 5) re-install head of engine (replacing head gasket)
Note that this procedure preserves the engine timing, so you need not reset it.
The end gap is derived from the bore size. For the 2.91" (74mm) Geo 3 cyl bore, the top ring end gap is .004" divided by bore, so that is 2.91" / .004 = .012". The second ring and oil ring should be bore divided by .005", so that is 2.91" / .005 = .015". Don't file the springy part of the oil ring, as it is designed to compress and fit snuggly; just file the top and bottom ring that sandwich the springy part.
timming is not the issue, sounds like the valve seals are leaking, or the piston rings are severly worn. these engines are fairly simple to just rebuild the entire engine.....ie...seals,rings gaskets, maybe a have the head dropped off and have it checked for cracks or warpage.
Oil out the tailpipe is definitely oil control rings and all the rings on the pistons simply worn out from high mileage.If keeping the vehicle,a remanufactured engine would be the best choice,with a good warranty.A used engine is also a possibility,but sometimes hit or miss.A rebuild would consist of about the same cost as a remanufactured unit.To correct only the oil problem would consist of a complete disassembly of the engine.The block would have to be taken to a machine shop and overbore the cylinders whatever is needed,.020"-.040",and purchase new pistons corresponding to the overbore,and all new rings.Top compression ring,secondary compression ring,both oil control rings,and the oil control expander.This will correct the oil out the tailpipe,but you are at a full on rebuild at that stage.