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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
No it is made of special material and if blocked will not operate as it should. The holes are about 1/16 " in size. The normal problem is from the use of incorrect sump oil or the insides of the cat converter crack and block the exhaust time outlet. Replace it with a new one as it affects the O2S sensor operation.
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 !!!
check for grey/ white engine oil in the sump. Have a compression test done to determine if it is a head gasket or cracked head problem . Have a coolant system pressure test done to find the leak especially at the hole under the water pump shaft.
You have water getting into the sump. Have a compression test done to check the head gasket and cracked head.. The water may be coming in from pin holes (Corrosion ) behind the water pump impellor in the aluminium housing