Please explain a big end rattle.
29-10-2006, 05:43 PM
#1
Please explain a big end rattle.
Ok since i changed the lifters i have got a quieter engine but the same rattle under load..deffo sounds top end...oil pressure is 75psi cold drops to 25psi warm (unsure what grade oil) driving arounds its on 50ish psi.
Not i can get it to do it on my drive by putting the handbrake on and enagaging reverse and attempting to move and handbrake holds it..it sounds like a lifter rattle a metallicy tap tap tap.
Please say what a big end sounds like on a YB and when it should be noticable..as this rattle under load is there from stone cold.
Not i can get it to do it on my drive by putting the handbrake on and enagaging reverse and attempting to move and handbrake holds it..it sounds like a lifter rattle a metallicy tap tap tap.
Please say what a big end sounds like on a YB and when it should be noticable..as this rattle under load is there from stone cold.
29-10-2006, 05:56 PM
#2
does it dissapear when the engine is propperly up to temp?
it could be piston slap that is making the noise but should go when its all hot
but its quite hard to diagnose engine noises over the internet lol
however big ends will rattle all the time, rev the engine to 4k rpm and let off, if its the big ends you will hear it then
it could be piston slap that is making the noise but should go when its all hot
but its quite hard to diagnose engine noises over the internet lol
however big ends will rattle all the time, rev the engine to 4k rpm and let off, if its the big ends you will hear it then
29-10-2006, 06:13 PM
#4
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Phil,
From my experience with YB's, big ends rattle all the time when they
are not too healthy.
Also, if you have a big plenum (swedish style) , they amplify injector
operation and sound like a metalic ticking sound.
Otherwise, you sure its not low speed det
From my experience with YB's, big ends rattle all the time when they
are not too healthy.
Also, if you have a big plenum (swedish style) , they amplify injector
operation and sound like a metalic ticking sound.
Otherwise, you sure its not low speed det
29-10-2006, 06:22 PM
#5
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Try getting hold of a stethascope and pin pointing sound (or your ear on the end of a long screw driver)
Would it be worth removing sump and inspecting bearings?
Good luck
Would it be worth removing sump and inspecting bearings?
Good luck
29-10-2006, 06:50 PM
#6
...Simon this is on my runaround Saff NOT the BIG BHP one
..i would have thought the big ends would rattle all the time too...it deffo is quiet lo down it seems a top end noise..but i can only get it to do it by driving it...the rattle it makes stationary is exhaust side cam area....maybe worth trying a different oil aint got a clue whats in it.
..i would have thought the big ends would rattle all the time too...it deffo is quiet lo down it seems a top end noise..but i can only get it to do it by driving it...the rattle it makes stationary is exhaust side cam area....maybe worth trying a different oil aint got a clue whats in it.
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29-10-2006, 06:59 PM
#8
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Originally Posted by paulpalmer
Big ends normally rattle on over run not under load. It could be detonation. It's hard to tell really without hearing it.
Bri.
29-10-2006, 07:30 PM
#11
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Daz, thats what i thought. My big end RATTLED, sounded just like piston slap - as u know - i was convinced it WAS piston slap.
It did it under light load, but under boost, it dissapeared, and u couldnt hear it at idle.
It did it under light load, but under boost, it dissapeared, and u couldnt hear it at idle.
29-10-2006, 07:40 PM
#12
When i took the followers out the first one on the exhaust side was almost solid you couldnt move it down..it came out ok with a magnet..i put the newer set in and on the same one it didnt feel like the rest?You couldnt move it down..the rest you could with a finger slightly.
The engine has only done 2k miles since rebuild by someone else...and as said very good oil pressure it sounds like its from the top and aint a deep rumble..only does it under light load to say 3k revs..on overrun not a peep..and stationary all is good.
Before i did the followers the engine did the same but with a rattle every now and again from the top at anytime..hence why i changed them....everything is sorted bar the light load tap.
The engine has only done 2k miles since rebuild by someone else...and as said very good oil pressure it sounds like its from the top and aint a deep rumble..only does it under light load to say 3k revs..on overrun not a peep..and stationary all is good.
Before i did the followers the engine did the same but with a rattle every now and again from the top at anytime..hence why i changed them....everything is sorted bar the light load tap.
30-10-2006, 08:51 AM
#15
Originally Posted by DazC
Big ends don't rattle, they knock.....
Possible its the little ends i guess, but that would be quite unusual (although not unheard of im sure, just never seen it myself) on a YB
30-10-2006, 09:37 AM
#17
As above, could be the little ends possibly.
Head gasket of course can also lead to a rattle, but without symptoms such as oil or water use if its just gone between two cylinders, so might be worth doing a compression test?
Head gasket of course can also lead to a rattle, but without symptoms such as oil or water use if its just gone between two cylinders, so might be worth doing a compression test?
30-10-2006, 10:05 AM
#19
...checked everywhere found a blow on the exhaust manifold middle piece..thought that would cure it...its better..but not cured...wouldnt little end cause a rattle on the after run?..this is purely in 1st 2nd 3rd..dont do it 4th 5th i dont think
30-10-2006, 10:12 AM
#20
Originally Posted by Bosch-Man
...checked everywhere found a blow on the exhaust manifold middle piece..thought that would cure it...its better..but not cured...wouldnt little end cause a rattle on the after run?..this is purely in 1st 2nd 3rd..dont do it 4th 5th i dont think
Weird that its doing it only in 1st 2nd 3rd, possible though its doing it in 4th and 5th but you cant hear it due to windnoise etc?
If the manifold partly cured it, maybe there is still a leak from elsewhere on the exhaust side, like manifold to head or middle piece to turbo?
30-10-2006, 10:44 AM
#23
..as said i had one that wouldnt push down at all with a finger the rest did...but if it is sod changing it...i will have to helicoil it all again
..will it do any harm leaving it like it?Assuming it is a tappet/tappets?
..will it do any harm leaving it like it?Assuming it is a tappet/tappets?
30-10-2006, 10:46 AM
#24
If its tappetts then most likely effect (other than a slight loss of power) is premature cam wear as the standard cam profile is quite harsh as it opens due to being designed to work with zero clearance.
30-10-2006, 10:56 AM
#26
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I know it seems obvious Phil but you have done the cam timing correctly...ie on the lug or where it was marked before you removed the belt....its not the exhaust valves just kissing the piston?
30-10-2006, 11:06 AM
#27
...i know what you mean...but i am sure the 2 pointers are lined up..if say it WAS one tooth out either way is that enuff to do that?..Surely it would need to be a couple of teeth out?...I will check that later though just in case..its feasable!
30-10-2006, 11:47 AM
#29
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Originally Posted by Bosch-Man
...i know what you mean...but i am sure the 2 pointers are lined up..if say it WAS one tooth out either way is that enuff to do that?..Surely it would need to be a couple of teeth out?...I will check that later though just in case..its feasable!
I did point that out on the last post....
Did the same to my saph once, checked the belt and it was 1 tooth out, moved the belt and it was fine
30-10-2006, 11:56 AM
#31
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Cant believe you changed the followers and have obviously given it the once over, but not changed the oil? I see youve said you will do this now so lets hope thats the cause.
Would have been first thing on my list.
Would have been first thing on my list.
30-10-2006, 12:04 PM
#32
Originally Posted by polly_x
Cant believe you changed the followers and have obviously given it the once over, but not changed the oil? I see youve said you will do this now so lets hope thats the cause.
Would have been first thing on my list.
Would have been first thing on my list.
30-10-2006, 12:06 PM
#33
Originally Posted by chip-3door
Originally Posted by polly_x
Cant believe you changed the followers and have obviously given it the once over, but not changed the oil? I see youve said you will do this now so lets hope thats the cause.
Would have been first thing on my list.
Would have been first thing on my list.
..100% true
This doesnt rattle under load past 2-3k revs.
Oil change is next
30-10-2006, 12:12 PM
#35
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Originally Posted by chip-3door
Originally Posted by polly_x
Cant believe you changed the followers and have obviously given it the once over, but not changed the oil? I see youve said you will do this now so lets hope thats the cause.
Would have been first thing on my list.
Would have been first thing on my list.
He mentioned he had no idea what grade oil was in it and that just surprised me.
Anyway, hope you get it sorted out.
Just to throw some other less obvious ideas in the pot. Have you checked the bearings on the spinny things like, alternator, pumps etc etc?
Any loose or broken manifold studs (especially underneath)?
30-10-2006, 12:25 PM
#36
Yep checked everything....found the cambelt tensioner was noisey so put another one on.
The reason i didnt change the oil is cause it was only rebuilt 2000miles ago and has only 1000miles on new oil..so didnt deem it urgent BUT then i cant garantee that...and may have a wrong grade oil etc..they THINK it was mobil 1 motorsport...Still i will change oil in anycase and re check timing but as said unlikely as it only does it sub 3k revs!
The reason i didnt change the oil is cause it was only rebuilt 2000miles ago and has only 1000miles on new oil..so didnt deem it urgent
BUT then i cant garantee that...and may have a wrong grade oil etc..they THINK it was mobil 1 motorsport...Still i will change oil in anycase and re check timing but as said unlikely as it only does it sub 3k revs!
30-10-2006, 02:57 PM
#38
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i'd be changing the tappets again if you think there may be a problem with one. I wouldn't rule out big end. You could also have a broken ring land.
30-10-2006, 05:42 PM
#39
UPDATE....just had a look and i got it to rattle stationary...its from the top for sure...if you really rev it from holding at 2500rpm there is no noise...from tickover to 2500rpm it sounds like a diesel inlet side is quiet it get louder with the ear test over the turbo area?
Any ideas...it dont sound like an exhaust blow so i cant see it being a leak.
inlet side is quiet it get louder with the ear test over the turbo area?Any ideas...it dont sound like an exhaust blow so i cant see it being a leak.
