Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum - View Single Post - Coolant flooding cylinder 4 fresh rebuild

Moore · 11-03-2019, 11:15 AM

Thanks for the post good info.

Im confident the coolant isn't entering through the intake. one of the first things i did was disconnect all coolant lines to the intake and blocked them. Also when i take the intake off it's completely dry. Unlike the exhuast manifold which is soaked.

So no, my post yesterday i had done the leak down at tdc. Since the cams were still installed at the time. It should have been obvious to me but when i went to bed i thought that since the cams are out the valves are now closed all the time, so i can test the cylinders at bdc like you mentioned.

So put the head back on this morning... think im up to 8 times... first 3 were all good held 100% cylinder 4 however was 10% leak down.

So i did what you said. I hooked up all of the coolant lines but to make things less sure i got no pressure in the cooling system. My crank case is not hooked up though so i guess the air could be escaping by the rings.

But as said in earlier posts the oil looks good it's not mixing with the coolant.

How would i put vacuum to cylinder?

11-03-2019, 11:15 AM	#21
Moore Leaky Injector Join Date: Nov 2004 Location: toronto Posts: 67 Trader Rating: (0)	Thanks for the post good info. Im confident the coolant isn't entering through the intake. one of the first things i did was disconnect all coolant lines to the intake and blocked them. Also when i take the intake off it's completely dry. Unlike the exhuast manifold which is soaked. So no, my post yesterday i had done the leak down at tdc. Since the cams were still installed at the time. It should have been obvious to me but when i went to bed i thought that since the cams are out the valves are now closed all the time, so i can test the cylinders at bdc like you mentioned. So put the head back on this morning... think im up to 8 times... first 3 were all good held 100% cylinder 4 however was 10% leak down. So i did what you said. I hooked up all of the coolant lines but to make things less sure i got no pressure in the cooling system. My crank case is not hooked up though so i guess the air could be escaping by the rings. But as said in earlier posts the oil looks good it's not mixing with the coolant. How would i put vacuum to cylinder?