Timing belt startup?

Nissan 300ZX technical discussion forum: Maintenance, performance, installations, modifications, how-to's and troubleshooting.
Mikey_ZX
Posts: 165
Joined: Tue Jun 15, 2010 10:28 pm
Car: 91 Infiniti Q45 1st Gear Start
94 Nissan 300zx N/A
2008 Chevy Aveo 5
2013 Toyota Venza Limited AWD
Location: Cali

Post

Can I start the engine with the sprockets at top dead center or should I rotate the crankshaft clockwise 120 degrees before starting the engine??? I have already rotated the crank shaft 720 degrees, I just ended back at tdc, is it okay to start like this???


marty1mc
Posts: 733
Joined: Sat Jan 16, 2010 1:51 am
Car: 1990 Nissan 300ZX TT - Z owner since 2003
Location: Fuquay Varina,NC

Post

Rotating the motor is not important just to start the motor. What is important is ensuring the timing belt is properly aligned on the sprockets and the tension is proper. There are various methods to do this, but the FSM suggests rotating the motor 120 deg and back to check both. I mark the backplate where the cam gear marks align after the timing belt is on properly. Then, I rotate the crank shaft twice, back to TDC and then check the gear marks against the backplate marks. This will verify the timing belt is installed properly. I then check the gap on the tensioner to make sure it's approx 4mm. The spec is 3.5mm to 5mm.

I hope this helps...

Mikey_ZX
Posts: 165
Joined: Tue Jun 15, 2010 10:28 pm
Car: 91 Infiniti Q45 1st Gear Start
94 Nissan 300zx N/A
2008 Chevy Aveo 5
2013 Toyota Venza Limited AWD
Location: Cali

Post

All marks are aligned properly and my tension is around 4.5mm, thank you for all your help and replies in answering all my questions!! You guys have been a big help in this process, especially because I'm always questioning something!

Mikey_ZX
Posts: 165
Joined: Tue Jun 15, 2010 10:28 pm
Car: 91 Infiniti Q45 1st Gear Start
94 Nissan 300zx N/A
2008 Chevy Aveo 5
2013 Toyota Venza Limited AWD
Location: Cali

Post

I just finished my timing belt install and drove the car yesterday, everything seems fine except for my loose alternator belt squealing. I just want to thank all the members who helped me during this process, thank you guys again!!!


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