SR stock cams probably SHOULDN'T look like this after 6k on motor rebuild? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

SexOnWax · 05-12-2013, 10:14 AM

I was having issues with the motor struggling to stay running at idle. Once I put the vehicle in gear, the car would die and would not start again until the motor was completely cool. The last time it ran, I did notice white smoke pouring from the exhaust. Immediately I thought blown head gasket. A compression test was performed to verify this. At only 6,000 miles on what I was told was a fresh rebuilt S14 SR Zenki motor, this was the first time I opened the valve cover plate to get to the spark plugs. Notice what's written on the first ignition coil? Not a good sign.

The test revealed cylinders 3 and 4 both read at 138psi while 1 and 2 showed 125 and a whopping 35psi respectively. Argh. We then pulled the valve cover and saw the condition of the cams. Cylinder 1's cam lobe on both intake and exhaust sides were perfectly fine. The other three were grimey and if you notice on the first picture of the lobe up close, the middle section was grounded down and there are two little edges that show this. So cylinder 1 cam lobe edge looked like _____ but the other three are |_____|.

The motor only has just over 6,000 miles on what I was told was a rebuilt motor using new stock components with the exception of an Apex metal head gasket, ARP headstuds, and rocker arm stoppers internally while running a Tomei Arms M7960 turbo on a Power FC D-Jetro. I fear that my problem is much much worse than just a blown head gasket and cams. Can anyone please help shed some light on this?

Oh, and to the shop that installed this motor, you know who you are. I am withholding any negative comments about you until I can pinpoint the exact problem. Rest assured, justice will be served if it was complete negligence on your part.

05-12-2013, 10:14 AM	#1
SexOnWax Join Date: Sep 2008 Location: Cleveland, OH Posts: 49 Trader Rating: (10) Feedback Score: 10 reviews	SR stock cams probably SHOULDN'T look like this after 6k on motor rebuild? I was having issues with the motor struggling to stay running at idle. Once I put the vehicle in gear, the car would die and would not start again until the motor was completely cool. The last time it ran, I did notice white smoke pouring from the exhaust. Immediately I thought blown head gasket. A compression test was performed to verify this. At only 6,000 miles on what I was told was a fresh rebuilt S14 SR Zenki motor, this was the first time I opened the valve cover plate to get to the spark plugs. Notice what's written on the first ignition coil? Not a good sign. The test revealed cylinders 3 and 4 both read at 138psi while 1 and 2 showed 125 and a whopping 35psi respectively. Argh. We then pulled the valve cover and saw the condition of the cams. Cylinder 1's cam lobe on both intake and exhaust sides were perfectly fine. The other three were grimey and if you notice on the first picture of the lobe up close, the middle section was grounded down and there are two little edges that show this. So cylinder 1 cam lobe edge looked like _____ but the other three are \|_____\|. The motor only has just over 6,000 miles on what I was told was a rebuilt motor using new stock components with the exception of an Apex metal head gasket, ARP headstuds, and rocker arm stoppers internally while running a Tomei Arms M7960 turbo on a Power FC D-Jetro. I fear that my problem is much much worse than just a blown head gasket and cams. Can anyone please help shed some light on this? Oh, and to the shop that installed this motor, you know who you are. I am withholding any negative comments about you until I can pinpoint the exact problem. Rest assured, justice will be served if it was complete negligence on your part.