Oil leaking from front of motor

Nissan 300ZX technical discussion forum: Maintenance, performance, installations, modifications, how-to's and troubleshooting.
Jakeostler
Posts: 1
Joined: Sun Dec 05, 2021 1:02 pm
Car: 1990 Nissan 300ZX TT M/T

Post

So I have an irritating oil leak that I cannot find for the life of me. It is originated somewhere in the timing belt area. It it drips every second resulting in everything getting covered by oil within minutes. I see the leak coming from behind the crank pulley on the drivers side. I’ve tried running the motor with the timing covers off to find the leak but doesn’t really help that much.

1990 300zx twin turbo. With 156k miles on motor. I’m getting the car tuned but the tuner won’t tune it with how bad it’s leaking.
History.
The engine was pulled apart to change head gaskets. A reseal kit was used from Z1.
After I noticed how bad it was leaking, I decided to reseal the oil pan seal, oil pump seal and front crank seal. Put it all back together. And it still leaks.
Decided to pull it apart again, reseal the camshafts, valve covers And cam caps with a bit of silicone not to get silicone in the little holes between the cam cap and the head. and the vtc seals. Put it back together and it’s still leaking.

Anybody know if any seals I might have missed, bolt holes that need silicone?
Does oil run through the area where the CAS is? I haven’t replaced the seal for the CAS but I haven’t been able to find a part number either.
The intake cam gears fit nice and snug in the cam seals so I don’t know if that would leak even tho it seems like it’s on correctly.


itsa300zx
Posts: 1287
Joined: Sun May 31, 2009 9:39 am
Car: 1990 300zx NA W/TT swap
2011 Nissan Rogue S
2008 Highlander SR5
Location: up North

Post

The intake cam gears can leak oil from the back side.
See here:
https://www.bde-performance.com/vtc.htm


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