R34 Timing Belt Slipping Off

[mooney101]

Hi guys I replaced the timing belt on my 34 today once I got it on I put the cas back in and gave it a quick run with nothing connected including the harmonic balancer not being on I only ran if for about 5 seconds and when I have gone back around the front of the car I noticed the timing belt had come halfway off the gears and crank cog I was just wondering if anyone has any idea on what it could be eg to tight? Or is it that the large washer thing that goes on behind the harmonic balancer wasn't there to hold the belt in place? Any info would be much appreciated

[Ben C34]

The guide not being there is the problem. You are heaps lucky it didn't actually come off.

[Dose Pipe Sutututu]

could be a number of things:

• the bolt holding the tensioner OR idler is bent
• Belt under/over tightened
• crack plates put on wrong
• cam wheels not on properly (backwards even)

to tension belt, put everything on but don't tighten the tensioner, crank the motor by hand (only by hand) for 2/3 revolutions. The spring on the tensioner is enough to pull the slack out, then tighten up tensioner in place. Rookie mistake is under tension. End result after motor starts, there should be about 1/2 a twist of the belt in slack

[jjman]

The guide not being there is the problem. You are heaps lucky it didn't actually come off.

this. damn, so close.

my mate did this and he reckoned it was about 10-15 seconds before the belt came off lunching the valves with the pistons and ending the otherwise healthy motor's life.

be careful mate.

[Jacko1987]

Yep I'm a recent victim to this except myn came off trying to figure out my next step while giving myself an uppercut