72autoZ

I installed the alternator upgrade on my 72 240Z some time ago, but continue to have one problem. The 280Z uses a wider V belt (.47 inch outside width vs. 240 Z .41 inch outside width.) The 240Z belt 7335 rides very low in the alternator pulley and at startup slips and squeals. I tried installing the 240Z alternator pulley on the 280Z alternator, but then the pulley is offset from the fan and crank pulleys. I tried using a belt sized for the 280Z alternator and that rides very high in the fan and crank pulleys. Has anyone come up with a solution or do you just live with it?

I installed the alternator upgrade some time ago, but continue to have one problem. The 280Z uses a wider V belt (.47 in outside width vs. 240 Z .41 in outside width.) The 240Z belt 7335 rides very low in the alternator pulley and at startup slips. I tried installing the 240Z alternator pulley on the 280Z alternator, but then the pulley is offset from the fan and crank pulleys. I tried using belt sized for the 280Z alternator and that rides very high in the fan and crank pulleys. Has anyone come up with a solution or do you just live with it?

I'm having the same problem. I've even got the engine up to operating temperature, shut the engine off and then turned the ignition back on without starting the engine. The water temperature guage is then functioning and continues to fluctuate. That would rule out the voltage regulator associated with the alternator. I have a 72 240Z Service Manual published by Nissan which states that there is a voltage regulator built into the combined water temperature guage and oil pressure guage to compensate for thermal effect. Could this be causing the problem. If so is there a solution?

I've been reading a number of the posts about the intake manifold water line and the pros and cons about removing it. For information, the emission control section of my 72 FSM addresses it and also indicates that there is a manifold heat control thermostat in the line which is designed to close at about 175 degrees F. That would sort of put the kabash on the theory that the line helps during dyno testing or after the engine has heated up. The thermostat on my very stock 72 is just aft of the rear carb. The manual also states that if the thermostat fails to close in hot weather, carb percolation may occur.

Hi there. I have owned my 72 240Z since 1992 and have really enjoyed it. It gets driven about 150 miles per week (mostly back and forth to the golf course. I have recently installed the 240Z 60 amp alternator kit from MSA. I'm having a problem with the pulley on the new alternator in that its groove is about an 1/8 inch wider at the top of the groove than the stock pulley which causes the belt to ride about 3/16 inch down in the groove. No matter how I adjust the belt tension, the belt slips at engine start up, but is fine after the engine is running. The alternator, according to MSA is original equipment on an 81-83 280ZX Turbo. The pulley is of a 2 piece (split in the middle) construction. Has anyone else encountered this problem? Solutions?