whitestu
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| posted on 11/7/08 at 05:46 PM |
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Noisy Zetec Blacktop Again
Following on from my previous post, the Zetec is in and running well, but I still have a top end noise.
I'm going to be putting 2.0 cams in soon and want to try to diagnose the cause of the noise when I fit them. There is no apparent wear on the
existing cams and the valve clearances are fine.
However to me the noise sounds like a worn cam, except for it comes and goes a bit when cold and goes completely when warm.
The engine runs fine and has been driven hard over the past couple of weeks with no problems.
Any suggestions?
Link to video
Thanks
Stu
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big_wasa
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| posted on 11/7/08 at 06:17 PM |
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I can not think how that is cam train noise ?
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whitestu
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| posted on 11/7/08 at 06:21 PM |
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quote:
I can not think how that is cam train noise ?
It definitely sounds like its from the top end though. What else could it be?
Stu
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Bigheppy
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| posted on 11/7/08 at 06:44 PM |
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Why don't you use the locost stethoscope, put a screwdriver to your ear then touch it on the cam cover , move it along to see if the sound is
louder in a particular position. Then try to touch other parts of the engine. It wont tell you what is causing the problem, but this would give you an
idea where the noise is coming from. 
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r1_pete
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| posted on 11/7/08 at 07:12 PM |
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Sounds like a small end bearing gone....
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Ketchup
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| posted on 11/7/08 at 07:53 PM |
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Sorry to agree with the above, but it does sound like an end knock to me too 
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jacko
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| posted on 11/7/08 at 08:06 PM |
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Valves tapping piston tops ? is the cam timing right ? or as above small end
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austin man
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| posted on 11/7/08 at 08:36 PM |
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disconnect the water pump belt run the engine this will rule out water pums altenator etc, had a simmilar problem with the silvertop, problem was
Knackered alternator bearing
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whitestu
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| posted on 11/7/08 at 09:09 PM |
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Thanks
I'd considered a small end bearing. I'm surprised that it goes away when warm though.
I'm 99% sure its not the alternator as its a new Denso one. I'll check though.
Are small end failures common on Zetecs?
Stu
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whitestu
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| posted on 11/7/08 at 09:09 PM |
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Thanks
I'd considered a small end bearing. I'm surprised that it goes away when warm though.
I'm 99% sure its not the alternator as its a new Denso one. I'll check though.
Are small end failures common on Zetecs?
Stu
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whitestu
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| posted on 11/7/08 at 09:10 PM |
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Thanks
I'd considered a small end bearing. I'm surprised that it goes away when warm though.
I'm 99% sure its not the alternator as its a new Denso one. I'll check though.
Are small end failures common on Zetecs?
Stu
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Jackman
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| posted on 11/7/08 at 09:21 PM |
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Take it you are still on hydrualic lifters ? What grade of oil are you using ?
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big_wasa
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| posted on 11/7/08 at 10:01 PM |
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Black tops arnt hydraulic, solid with shims
Be aware that pulling the head to have a look will cost more to rebuild than another engine.
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Dusty
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| posted on 11/7/08 at 10:38 PM |
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Whip off the cam cover to inspect the cams and use the trusty feeler gauge to check the 'tappets'. Inlet - 0.15mm. Exhaust - 0.30mm
cold.
At least it should identify a cam train fault.
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zetec
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| posted on 11/7/08 at 10:44 PM |
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I had a noise very much like a noisy cam when I did a rebuild, turned out the throttle pot was not set correctly meaning the timing was way out,
caused pinking which cleared when the revs picked up...really had me going for a while!
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bigrich
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| posted on 11/7/08 at 10:49 PM |
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just listened to the video, i would go with the little end theory, sounds to heavy for valve clearences.
.JPG)
A pint for the gent and a white wine/fruit based drink for the lady. Those are the rules
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D Beddows
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| posted on 12/7/08 at 02:48 AM |
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Small end bearing
Wouldn't affect power, would probably quieten down when the engine was warm - valves hitting pistons wouldn't and you'd probably
have broken it properly by now - valve clearance problems would be audible when you revved it from cold......
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whitestu
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| posted on 12/7/08 at 09:48 AM |
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So if it's a small end is it likely to fail?
At the moment the car goes really well.
I'm tempted to drive until it pops.
Stu
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big_wasa
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| posted on 12/7/08 at 11:46 AM |
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When it does go .................... by by enginge
pist-n-broke
[Edited on 12/7/08 by big_wasa]
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whitestu
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| posted on 13/7/08 at 11:35 AM |
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Has anyone got experience of this happening on a Zetec?
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stevebubs
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| posted on 13/7/08 at 01:30 PM |
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Stu,
A friend is a driving instructor and had tapetty noises on his last car (sigma powered fiesta). He never got to the bottom of it.
On his current car (same engine), the same noise appeared almost immediately after his first service.
When the car went in for its service, the oil was clear (he changes it every 2-3k miles). When it came out, it was black. Local dealership was
obviously using the lowest grade oil it could get away with.
It took 3/4 flushes of the engine to get rid of the noise, and the car no longer goes into the local Ford dealership.
[Edited on 13/7/08 by stevebubs]
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stevebubs
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| posted on 13/7/08 at 01:32 PM |
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Just listened to the vid. Definitely louder than the problem my mate had - that was just a clickety click.
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jacko
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| posted on 13/7/08 at 06:20 PM |
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Did it make that noise before fitting the bike carbs ? it sounds a bit like mine but louder mine is the carb slides tapping untill you rev the engine
its just a thought
Jacko
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whitestu
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| posted on 13/7/08 at 08:25 PM |
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quote:
Did it make that noise before fitting the bike carbs ?
Not sure - I've only ever heard it running with bike carbs. I'll check the sildes, but I don't think that's what it is.
Stu
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whitestu
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| posted on 13/7/08 at 08:56 PM |
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I've had a good search on google and can't find anything on small end failure in Zetecs.
The oil that came out of the engine was dead clean and there's no noise from the bottom end. The oil light goes out on the starter [not checked
the oil pressure though].
I know it's an impossible question to answer, but is it really that likely that the small ends will fail in an otherwise good engine?
Stu
[Edited on 13/7/08 by whitestu]
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