i need help i think i blew the old 240 up - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

geeaj · 03-24-2002, 11:19 AM

Hot rod guy is on the right track. You should do a compression check to figure out if its a head gasket or blown ring. Take the readings from each cylinder, you have have +- 15psi within each bore. Find the reading that is the lowest, pour a little motor oil in the spark plug gallery and test again. If compression goes up, then its a problem with the rings, the oil acts as a sealant to raise the psi. If nothing happens, your head gasket is most likely shot.

03-24-2002, 11:19 AM	#4
geeaj Zilvia Junkie Join Date: Dec 2001 Posts: 357 Trader Rating: (0) Feedback Score: 0 reviews	Hot rod guy is on the right track. You should do a compression check to figure out if its a head gasket or blown ring. Take the readings from each cylinder, you have have +- 15psi within each bore. Find the reading that is the lowest, pour a little motor oil in the spark plug gallery and test again. If compression goes up, then its a problem with the rings, the oil acts as a sealant to raise the psi. If nothing happens, your head gasket is most likely shot. __________________ Beware the fury of a silent man, be more cautious of his silent farts....