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HELP - weird noise at idle - cleveland 351 

 

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 Post subject: HELP - weird noise at idle - cleveland 351
Posted: Sun Aug 21, 2011 7:15 pm 
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Hi all,
I have a weird noise thats just started over the last week or so thats doing my head in - at idle, there's a sort of squeaking/rubbing noise that sounds like its coming from the passenger side head / rocker gear maybe? It pulses at roughly the right rate to be valve gear related, and as soon as the revs get up above about 800 rpm it 99% disappears but I can juust hear it accompanied by a bit of more conventional tappet type noise - not clattery, but louder than it normally was. Once moving, the car seems to drive normally, the engine sounds OK, power seems OK etc. If I come to a stop the noise is gone or very faiint - but if I turn it off and leave it for a few minutes (say, going into a shop or something) then when I start it back up the noise is there again...then once you get moving it goes away as above...I'm really hoping its not bottom end or piston slap type noises but I'm thinking if it was, it'd get worse with revs, not go away... thoughts, please?

 

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 Post subject: Re: HELP - weird noise at idle - cleveland 351
Posted: Sun Aug 21, 2011 7:48 pm 
Getting Side Ways
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have you taken the rocker cover off to have a good look and try wiggle things around?
Or even while the cover is off. get somone else to start it and you inspect the rockers. but shut it down before the oil flys. lol.

 

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 Post subject: Re: HELP - weird noise at idle - cleveland 351
Posted: Sun Aug 21, 2011 7:52 pm 
Getting Side Ways
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Benny D wrote:
have you taken the rocker cover off to have a good look and try wiggle things around?
Or even while the cover is off. get somone else to start it and you inspect the rockers. but shut it down before the oil flys. lol.

yeh, I want to do this, hoping to get a chance to do this later tonight - do you reckon it sounds more like rocker /valve type stuff than piston/bottom end?

 

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 Post subject: Re: HELP - weird noise at idle - cleveland 351
Posted: Sun Aug 21, 2011 8:54 pm 
Getting Side Ways
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without hearing the noise a squeeking/rubbing sorta noise can be anythin from bearings not being lubricated to a slipping belt or a pump ceasing.

 

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BA XT V8. Ice Mint. 18" Speedys. XR6T LSD. Full Pacemaker twin 2 1/2inch Stainless Steel system. Custom CAI. Black XR interior with white trimming. Powerbond underdrive kit 25%.
13.65@102mph. 2800 hi-Stall.
230RWKW@5250 rpm. 625NM.

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 Post subject: Re: HELP - weird noise at idle - cleveland 351
Posted: Sun Aug 21, 2011 9:25 pm 
Getting Side Ways
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Benny D wrote:
without hearing the noise a squeeking/rubbing sorta noise can be anythin from bearings not being lubricated to a slipping belt or a pump ceasing.

yeh, I know, pretty vague description - its not a belt, dropped those off this morning, noise still there. Just about to go and pull the rocker cover off to see whats what..

 

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 Post subject: Re: HELP - weird noise at idle - cleveland 351
Posted: Sun Aug 21, 2011 11:53 pm 
Getting Side Ways
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right, so, took off rocker cover - its the frontmost rocker on the passenger side. All rockers look fine, all pushrods are straight and rotating fine. All feel smooth when running except the front one which feels a bit `rough' and corresponds with the noise - as I increase revs slightly the noise goes, to be replaced by a tappet type ticking - which I can stop by applying finger pressure over the valve - so, any ideas as to what's going on here???A video for your listening pleasure is below:

http://www.youtube.com/watch?v=aoCelmwW1pU

 

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 Post subject: Re: HELP - weird noise at idle - cleveland 351
Posted: Mon Aug 22, 2011 9:24 pm 
Getting Side Ways
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hmm wouldnt be the oil pump would it?

could be jamming a bit on low revs but freeing up wen you rev it?

 

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BA XT V8. Ice Mint. 18" Speedys. XR6T LSD. Full Pacemaker twin 2 1/2inch Stainless Steel system. Custom CAI. Black XR interior with white trimming. Powerbond underdrive kit 25%.
13.65@102mph. 2800 hi-Stall.
230RWKW@5250 rpm. 625NM.

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 Post subject: Re: HELP - weird noise at idle - cleveland 351
Posted: Tue Aug 23, 2011 11:33 am 
Getting Side Ways
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Benny D wrote:
hmm wouldnt be the oil pump would it?

could be jamming a bit on low revs but freeing up wen you rev it?


I think its OK now - what I did while I had the rocker cover off was dribble anti lifter rattle stuff (I ran a bottle thru it earlier in the day and had a little bit left ) down the pushrod into the lifter - then gave it aout 10 mins., dribbled some oil down for a chaser then ran it for a few seconds. Next morning, started it, it gave a couple of ticks then - no sound. I've since put it back together, still hearing an occasional noise but its running heaps better, no ticking so I think it was just crap in the lifter - I'll give it an oil change and new filter this weekend.

You got me slightly worried about the oil pump now ! - are they prone to jam like that? Not heard of that one before..

 

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 Post subject: Re: HELP - weird noise at idle - cleveland 351
Posted: Tue Aug 23, 2011 7:45 pm 
Getting Side Ways
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my brother had a oil pump jam on his xd 302.
ended up being small metal piece lodged in the pump and it absolutly shaffered the dizzy drive gear and we couldnt work out why.
after pulling the pump out we finally got it. little bugger it was.

 

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BA XT V8. Ice Mint. 18" Speedys. XR6T LSD. Full Pacemaker twin 2 1/2inch Stainless Steel system. Custom CAI. Black XR interior with white trimming. Powerbond underdrive kit 25%.
13.65@102mph. 2800 hi-Stall.
230RWKW@5250 rpm. 625NM.

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 Post subject: Re: HELP - weird noise at idle - cleveland 351
Posted: Tue Aug 23, 2011 10:49 pm 
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did that stuff his motor up? or did it stop in time with the dead dizzy?

 

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 Post subject: Re: HELP - weird noise at idle - cleveland 351
Posted: Wed Aug 24, 2011 12:00 am 
Getting Side Ways
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coz the little cog smashed to nothin the dizzy stoppd spinnin so stopped running.
but no nothin wrong after un-blocked pump and stuck a new cog on.

 

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BA XT V8. Ice Mint. 18" Speedys. XR6T LSD. Full Pacemaker twin 2 1/2inch Stainless Steel system. Custom CAI. Black XR interior with white trimming. Powerbond underdrive kit 25%.
13.65@102mph. 2800 hi-Stall.
230RWKW@5250 rpm. 625NM.

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