Help with Noise after changing timing belt....

[VQXTC]

Hi there all, Just finished replacing the cam timing belt and now there is a 'knocking noise' coming from the bottom end of the motor. I dont think it could be a big end bearing or the like as I only changed the timing belt and there was no noise like this before.

Has anyone had this happen to them...???

Cheers

Simon

[Panama]

hopefully you timed it up properly cos that could be a piston hitting valves.

[VQXTC]

Hi Panama, thanx for your reply however I am pretty sure that the RB30E is a 'Free Spining' Engine meaning valves will never hit pistons as long as it is running the standard cam which it is......

Thanx again for the reply....

Simon

[Panama]

could be then that your idler bearing is rooted. if grit gets into the bearing it can sond knocky but its just the bearing. maybe you disturbed it

[harry3]

re freespinning, I was told by someone who should know that the RB 30 is an interferrence type motor, does anyone know for sure?

hint, to see if the timing belt is broken, remove oil filler plug, inch over starter motor and have someone see if camshaft turns

[Panama]

i think the na with smash valves, but the turbo wont. because the turbo is only 6:1 compression. whereas na is about 9:1

[seans VL Calais]

the pistons can not hit the valves in the na or the turbo. my old engine started knocking something terrible turned out i spun a bearing, just chucked another engine in for $500

[starfire vc]

if you fitted the timing belt incorrectly its possible for the valves to hit pistons.regardless of wehter its an interferance engine or not..if the valve timinig is out that much it will allso be running like a bag of she ite

[VQXTC]

Hi there all, In regards to this noise..... I left out one thing when I done the changeover of the timing belt which may or may not be relevant. I did the harmonic balancer up with a rattle gun.... I know the bearing on the input shaft of the gearbox is on its way out......so maybe this could be the problem.........

Thanx again for the help so far........

Cheers

Simon

[VQXTC]

Hi there all, just an update to my problem. I have the car booked into the mechanics on thursday so hopefully i can get to the source of the problem I will let you know what happens.......

Cheers

Simon

[VQXTC]

Hi there all, sorry for the late post. But I have now had the car fixed and thought you might all want to know what caused the noise.........
When we replaced the timing belt we also replaced the oil seal on the front of the cam... However we had a bitch of a time trying to get it out..... so much so that the cam started sliding out.... What we didnt realise was that the cam had slid past the locators in the front cam retainer. We tried to get it back in and with a little bit of persuasion we did. Thats where we made the mistake...... We had broken the locators on the cam and the cam was allowed to slide back and forth in the head..... So hence the reason why the noise was there upon deceleration and gone on idle....... Just thought i would share with this with you all............

Cheers

Simon