Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum - View Single Post

Mikester · 07-09-2019, 07:05 AM

Googled, found this on Z1...

"The OEM SR fan clutch uses a viscous coupling to control fan speed based on engine temperature. It's a good design but after 20 years of use, most are simply worn out. Some fail by becoming too loose resulting in the fan spinning slower, often eventually resulting in overheating and catastrophic engine damage. Others fail by locking down and spinning at full engine speed all the time. When this happens the increased drag will rob considerable power and you will hear the sound of a lot of air rushing at idle and low speed."

Mystery solved lol... May swap mine out. Worse case, it will make no difference other than peace of mind.

07-09-2019, 07:05 AM	#48
Mikester Nissanaholic! Join Date: Jun 2007 Location: Kathleen, GA Age: 50 Posts: 1,938 Trader Rating: (0)	Googled, found this on Z1... "The OEM SR fan clutch uses a viscous coupling to control fan speed based on engine temperature. It's a good design but after 20 years of use, most are simply worn out. Some fail by becoming too loose resulting in the fan spinning slower, often eventually resulting in overheating and catastrophic engine damage. Others fail by locking down and spinning at full engine speed all the time. When this happens the increased drag will rob considerable power and you will hear the sound of a lot of air rushing at idle and low speed." Mystery solved lol... May swap mine out. Worse case, it will make no difference other than peace of mind. __________________ Last edited by Mikester; 07-09-2019 at 12:47 PM..