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check the sump oil level or the exhaust pipe when you start it
could be a hole behind the water pump allowing coolant into the sump or a bad EGR valve allowing coolant into the exhaust system
have a compression test done to check for head gasket or cracked head
indicates water leaking into the sump
could be a head gasket, cracked head,corrosion holes in the timing cover behind the water pump impeller
check the condition of the sump oil and if it is grey then that is the problem
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 !!!
Most vehicles you can but you may have to remove part of the exhaust or bell houseing to motor brackets or undo engine mounts & jack motor slightly or drop sump & undo oil pickup while sump partially in place. You will just have to work it out as you go
Yes, it's possible to change the seal after removing the balancer.
If the balancer shows signs of scratching, wear at the place of the seal, change that part too!
To remove the old seal, drill 2 small opposite holes in the seal flange ( there is metal in it ).
Screw 2 (parker) screws in the holes, so you can pull the seal out gently.
Grease the new seals' inner race, and put some sealant paste to the external race.
Push it back in place with a wooden piece ( drill a hole in the center for the crankshaft end )
Grease the outher race of the balancer. This will help the seal come gently into place.
The punto's suffer from porous sumps. The metal becomes thin and leaks oil. Although its not a difficult job to change, its a messy job. You have to draain all the oil out first, then remove all the bolts around the sump pan. If you are replacing the sump, its good practice to replace the gasket too.
The sump itself is not too expensive to purchase, and the job itself in a garage, shouldnt take any more than 2 hours.