S13 SR20 blacktop help - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

05civse · 04-04-2006, 11:38 PM

I just got a S13 blacktop SR20 and on the valve cover is written "good" from its initial test. Now my problem is I have very minimal compression on cylinder number 4 and about 95% leak down through the exhaust. The spark plugs are all very nice looking (a good brown) and all the same. The engine has 80K kilometers and the three other cylinders have about 7-9% leak down and good compression. My question is, if I believe the testing done by those who wrote "good" (which is possible because the spark plugs are all NGK R's and all are showing proper combustion) what could go wrong during shipping? Do the lifters tend to get stuck in an over filled position if the engine is over-revved (therefore holding open the exhaust valve)? I am going to check the clearance between the cam and the rocker arm to see if there is a gap between them when the valve should be closed. I assume if it is touching then the lifter may be somehow seized, if there is a gap than the valve may be burned (but why 95% leak down). Anyone ran into a problem like this before? What was the outcome?

04-04-2006, 11:38 PM	#1
05civse Leaky Injector Join Date: Jul 2005 Location: out and about Posts: 125 Trader Rating: (0) Feedback Score: 0 reviews	S13 SR20 blacktop help I just got a S13 blacktop SR20 and on the valve cover is written "good" from its initial test. Now my problem is I have very minimal compression on cylinder number 4 and about 95% leak down through the exhaust. The spark plugs are all very nice looking (a good brown) and all the same. The engine has 80K kilometers and the three other cylinders have about 7-9% leak down and good compression. My question is, if I believe the testing done by those who wrote "good" (which is possible because the spark plugs are all NGK R's and all are showing proper combustion) what could go wrong during shipping? Do the lifters tend to get stuck in an over filled position if the engine is over-revved (therefore holding open the exhaust valve)? I am going to check the clearance between the cam and the rocker arm to see if there is a gap between them when the valve should be closed. I assume if it is touching then the lifter may be somehow seized, if there is a gap than the valve may be burned (but why 95% leak down). Anyone ran into a problem like this before? What was the outcome?