Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[P6UL K]

Continuing from the cambelt party that was held by Matt (Guffer) on Saturday at his work and my 'eventful' journey home.

With the help of ChrisGixer, Kevin Woods, Twiglet and Jack (mainly for the team building talks    )

I managed to change my cam belt, aux belt and water pump during the busy day but on the way home I heard a 'knock-knock-knock-knock' when i pulled into Clacket Lane services, I'd mainly pulled over because the car was drinking fuel like no one's business!  I mean it was really dropping rapidly! Why would it of been doing this?

I had a look with the torch to see what was going on and there was one bolt hanging out of the water pump pulley and another had lost its head, it had completely disappeared!!  Now i know what the assumption is  But i torqued everything as per the Haynes manual that Chris left me.

So, i stripped it all down again yesterday and lined up the markings expecting the worst and found this....







Going from my little knowledge of the markings, I'm guessing all is ok with them?  Not having the correct timing tools i can't measure it to be 100% sure...

I can only put the knocking down to an air lock perhaps?  As it seem to clear after I'd released the pressure from the header tank and topped the level up.

I've been to Vauxhalls today and ordered all new bolts for all the pulleys and got some thread lock, luckily i managed to wind the remainder of the bolts out of the water pump, so that should be ok now... Although i've noticed it doesn't have as many blades as the one i replaced it with  :-?

Any thoughts.....?

[Darth Loo-knee]

The timing marks on the cam sprockets don't look to be miles out on the marks on the backing plate, but you really need to get the locking kit on it to make sure. I would have thought the tensioner would have been slightly more tight than that as the two lines lining up is a used belt, if you have only just changed it I would have expected it to be a little further around.
What torque setting did you tighten the water pump bolts too? In all the ones I have done I have torqued to the correct setting and no had a problem :-? Could the bolts braking off then the clattering have been the noise you heard?
Have you turned the car over by hand? if so is there any noises?

[Lazydocker]

As Pinky has said, the marks look to be reasonably close but can't be 100% without the special tool from the locking kit

Tensioner does look a little looser than I would have set it for a new belt but that shouldn't cause the problem, although it will mean that when the belt stretches slightly you'll have some slack there  :-/

Fuel consumption... Check the fuel unions are tight, although I would have thought a leak there would be perfectly evident and may well have caused a fire before you got home  :-/

Knocking will probably have been the pulley rattling on the pump... Releasing the header cap will have reduced the pressure in the system and you also spotted the wonky bolts and tightened them again (I assume)

[Kevin Wood]

I checked this belt before the covers went back on and everything was as it should be.

Neither the tension nor the timing are a cause for concern IMHO. Timing would need to be a tooth or more out to affect fuel consumption and more to cause knocking noises. Tension has relaxed to the "normal" setting fairly quickly but I've never checked it this early in a belt's life. It is now a "used" belt, after all.   The relaxation is due to the teeth bedding into the pullies so quite possible that a few hours running has seen all the slackening there is going to be.

I also reckon the knocking was the water pump pulley. Unsure about the fuel consumption though. :-/

Air leak, perhaps?

Are the multirams connected back up again and working?

Kevin

[feeutfo]

I dont think the timing marks are far enough out to cause any knocking, tension could be tighter, about 3mill past is about right iirc(trying to remember if it was yours i saw that looked spot on, might have been Joffs) apart from that theres no evidence to say anythings wrong in the pics imo.

If the water pump pulley was loose i might flqp about and knock.

Worth checking the belt thoroughly for damage, just in case the bolt head got in to the cam cover and stuck in the cam belt run briefly, highly unlikely, but its got to be worth a check. Check the aux belt for damage as well.

As said elsewhere, i have the same t shirt with over torquing those bolts, and heard them fail. It sounded like a stone bouncing around under the car working its way back to the rear ime.

Check the plenum o rings are seated correctly, and multi rams are connected re fuel consumption.
Pedal trick it too.

Hth

[feeutfo]

Took me 6 minutes longer to type almost the same thing.   

[Darth Loo-knee]

Took me 6 minutes longer to type almost the same thing.   

Tosser 

[feeutfo]

The second sets of marks on 3/4 bank. Are those correct? Sure they are, as the part numbers are the same on wheel 3 and wheel 4.

So the other set of marks are for the other cam on that bank, if you see what i mean. 3 and 4 wheels can be swapped and have both sets of marks, to put it another way...?

[Darth Loo-knee]

Like already said needs to be 2 teeth out to start bashing things 
Not sure I agree with the it must be already stretched to be on the used belt markings now though., but that should not cause any bangs...

[feeutfo]

 

Took me 6 minutes longer to type almost the same thing.   

Tosser 

 

[Darth Loo-knee]

The second sets of marks on 3/4 bank. Are those correct? Sure they are, as the part numbers are the same on wheel 3 and wheel 4.

So the other set of marks are for the other cam on that bank, if you see what i mean. 3 and 4 wheels can be swapped and have both sets of marks, to put it another way...?

Think your getting Paranoid now Ode Girl    the mark nearest to the 3 is for Cam 3.      the mark nearest to 4 is for cam 4. so yes you have them right 

Unless you removed the Sprockets and have not put them back with the locating dowel in the correct place

[feeutfo]

The second sets of marks on 3/4 bank. Are those correct? Sure they are, as the part numbers are the same on wheel 3 and wheel 4.

So the other set of marks are for the other cam on that bank, if you see what i mean. 3 and 4 wheels can be swapped and have both sets of marks, to put it another way...?

Think your getting Paranoid now Ode Girl    the mark nearest to the 3 is for Cam 3.      the mark nearest to 4 is for cam 4. so yes you have them right 

[Lazydocker]

Very true Kevin... It is now a used belt so there's a good chance that having been run for about 3 hours (I would have thought) it may have bedded already. But even if it hadn't, that wouldn't be causing any knocking or significant fuel consumption changes. At least we now know it's not the belt

Still think the knocking was the pulley 

[Kevin Wood]

Easiest way to check the knocking issue is to briefly run it without the aux. belt on, and see if all is well.

The other thing I have heard is a tapping / knocking-like sound when an air leak is causing it to run lean. (I think yours did this a little when it had that breather leak, Paul)

This is due to the intakes spitting back slightly and rattling the throttle plates. Might tie up with the fuel consumption issue?

Kevin

[Lazydocker]

Easiest way to check the knocking issue is to briefly run it without the aux. belt on, and see if all is well.

The other thing I have heard is a tapping / knocking-like sound when an air leak is causing it to run lean. (I think yours did this a little when it had that breather leak, Paul)

This is due to the intakes spitting back slightly and rattling the throttle plates. Might tie up with the fuel consumption issue?

Kevin

It did indeed... Would also be a strong contender as the plenum has been off