How The f**k Does This Happen (pic Inside)

[Rednisr31]

how the f**k does that happen? and why?

[khunjeng]

bolts sheered? old or low grade?

[The Mafia]

this is a joke right?

[femno]

Is that broken off at the camshaft??!

[Rednisr31]

yes its broken off at the camshaft

[666DAN]

Top effort :S

[MANWHORE]

oh, you're joking. Bad luck mate.

[femno]

Quick! pull it down so we can see why. Im very intrigued....

[Rednisr31]

how the f**k does that happen?

really, 110 in 5th in a r31 with a 3.9 ratio diff (speedo said about 80-90)

Edited February 4, 2007 by Rednisr31

[skylinecouple]

Having real life experience on this subject I`ll bet the person putting the timing belt on used excessive force which weakened the damned thing or slightly bent it and it snapped over time.If it was you Jack I feel sorry for you as I to now have a good engine sitting around with bent valves.If,however,it was someone else;well,I`ll leave that to you.

[racsov500]

keep in mind that this conversion was only completed a few days ago and the timing belt only has a couple of hundered kays on it

[Rednisr31]

excessive force how?

slipping the belt on the gears wasn't too hard, believe me there was nothing excessive about the force being used

timing belt, was done literally less than 200k's ago

cars been on the road like 200k's

[skylinecouple]

I asked that same question to my so called idiot mechanic,he used a lever to get the belt off instead of stripping everything first.Then believe it or not he admitted all and put in new cam.Ahh but thats not the end of the story.He replaces the belt with a mitsubishi part and leaves the tensioners as they were.Needless to say the belt let go on the dyno at 3,500rpm.I now have the R34 motor in with all R33 parts bolted back on.He only paid half.

[Rednisr31]

was done the same way i've done every other timing belt and i've never had any problems, i dont force them on with huge levers and shit

[Cubes]

You should always set the belts tension via the tensioner, I've found the belts at the correct tension make you think.... is that too loose?

If it feels tight. Its too tight. Its supposed to be just nice.

If that makes sense.

Never try to slide the belt on.

[Bl4cK32]

over tension on the belt itself?

more photos of

a) the underside of the now broken cam pulley

b) shot looking into the newly created hole where the cam pulley was

Did u do the work yourself?

history of motor?

may have just been abuse from its previous owner/s....

[paulr33]

fark no good dude

rebuild time i think

the pistons would be mashed im pretty sure

same as timing belt snap

[Rednisr31]

i do know you don't put the belt on when the tensioner is tensioned.....

motor had 97,000k's

work was done by myself

the belt felt fine when it was tensioned... made a nice houl sometimes, but i was told that gates belts make a little bit of noise for a few thousand k's when they are new

[skylinecouple]

I was thinking like Cubes,perhaps over tensioning.Did you replace everything? I know the damage is done but if we can work out why then it might help someone else.If all was replaced and no levering I don`t know,just seams odd the belt was changed 200k`s ago,coincidence? I forgot to ask if the engine was running when it let go.

[Rednisr31]

was doin 110 in 5th

belt was replaced, tensioner and idler were replaced

i tensioned the belt to where the tensioner snapped over into place, like they are meant to