Can you identify the sound?
#1
Can you identify the sound?
Hi all..
Just recently finished putting my 2.0 zetec back in the car and fitted the megasquirt and fired her up.... And it sounds like death. Imagine extremely loud tappets!
I had new je pistons, pins, rings and a rebore from specialised engines. They told me the crank, and rods were fine so I fitted new std size acl and glyco bearings throughout along with a new oil pump and seals.
Anyway I got that noise and thought it sounded like it was coming from the head so I bought another head and refitted it and it was the same.
Couldn't see any signs of the valves hitting the piston on either part.
Looking like the engine will need to come out, so looking for any ideas from anyone who may have heard this before.
Here's the video..
Just recently finished putting my 2.0 zetec back in the car and fitted the megasquirt and fired her up.... And it sounds like death. Imagine extremely loud tappets!
I had new je pistons, pins, rings and a rebore from specialised engines. They told me the crank, and rods were fine so I fitted new std size acl and glyco bearings throughout along with a new oil pump and seals.
Anyway I got that noise and thought it sounded like it was coming from the head so I bought another head and refitted it and it was the same.
Couldn't see any signs of the valves hitting the piston on either part.
Looking like the engine will need to come out, so looking for any ideas from anyone who may have heard this before.
Here's the video..
#2
first thing id check is the exhaust manifold and turbo for any blows as this can sound like tappets,then id have the sump off for a closer inspection . first id check the con rod bolts are tight and then the bearings .. did you personally check the little ends when it was built? bore clearances? whats the oil pressure like? as this is a blacktop have the tappets been shimmed correctly?
#3
first thing id check is the exhaust manifold and turbo for any blows as this can sound like tappets,then id have the sump off for a closer inspection . first id check the con rod bolts are tight and then the bearings .. did you personally check the little ends when it was built? bore clearances? whats the oil pressure like? as this is a blacktop have the tappets been shimmed correctly?
I never checked the little ends or clearances of bores. I left that all to the engine builders. Also the oil pressure is great. 80 on cold start with a little rev, 35/40 on idle.
I'm hoping someone here has an idea as to what the sound is familiar to. Its very uniform unlike a rattle. And I took a plug lead off each cylinder and it didn't quiet down. I poured oil down the bores to see if it queited down in the case of piston slap but no different.
I've tried a few things :/
#6
I cleaned all the bores and pistons when I removed the head last week and it all came up spotless again, no obvious sign of contact or damage.
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#8
Hmm I have a fociRS turbo and manifold.. A new manifold to head gasket and a new manifold to turbo gasket but its a universal one rather than the rip off ford one. Its a square hole instead of the round hole though. Even so.. It really is as loud as it sounds. Think of a diesel but twice as loud lol
#10
Anyone from round rainham Essex way that might be able to come take a listen?!
Two people have both said it sounds like its coming from the head though. Just want an experienced set of ears to listen to it before I rip the engine back out haha
#13
Yeah its blocked off with a copper washer. Nice n tight.
#15
#16
have you tried to pin point the area from where the noise is coming from? if you use a long screwdriver and put it on various points on the engine and place your ear on the other end you will be surprised what you can hear. just be careful around the timing belt and pulleys fella
#18
have you tried to pin point the area from where the noise is coming from? if you use a long screwdriver and put it on various points on the engine and place your ear on the other end you will be surprised what you can hear. just be careful around the timing belt and pulleys fella
Might change the turbo to manifold gasket too. Like I said if anyone Is local to rainham Essex tbrn please pop over and take a listen
#19
have you tried to pin point the area from where the noise is coming from? if you use a long screwdriver and put it on various points on the engine and place your ear on the other end you will be surprised what you can hear. just be careful around the timing belt and pulleys fella
Might change the turbo to manifold gasket too. Like I said if anyone Is local to rainham Essex then please pop over and take a listen
#21
Thanks for all the responses so far!
Thought I'd post this picture for you to look at. I'm insistent that its not the sound of big end knock and tried the oil down the bores to temporarily silence piston slap which made no difference. So I'm starting to think my head gasket is maybe too thin! So I went into a photo I took when swapping the head and noticed clean patches in the shape of the cylinder head. Thought it might be normal to have these areas with not much carbon on them but you can see in Cyl 1 especially that's its completely shiny, almost as if its been wiped off.
What do you think?
[IMG][/IMG]
Thought I'd post this picture for you to look at. I'm insistent that its not the sound of big end knock and tried the oil down the bores to temporarily silence piston slap which made no difference. So I'm starting to think my head gasket is maybe too thin! So I went into a photo I took when swapping the head and noticed clean patches in the shape of the cylinder head. Thought it might be normal to have these areas with not much carbon on them but you can see in Cyl 1 especially that's its completely shiny, almost as if its been wiped off.
What do you think?
[IMG][/IMG]
#26
No idea I cant find the original invoice, it was a 3 layer MLS HG for the focus RS from matt lewis Motorsport. What would you recommend for a non skimmed head? There's a 4 layer MLS version which should suffice right? Or maybe the 1.8mm I've heard about.
Added some more photos of the head removed too, you can see where its been making contact.
#27
How far are the pistons out of the hole ?
How far is the bit of piston that made contact out of the hole when it's rocking at it's highest ?
And how thick was the gasket ?
That will basically give a clue as to whether you need to delve into bearings or not
The pistons may have just been hitting as they rocked at the top of the bore, which you will hope for.
But potentially there is bearing damage, piston damage, pistons squashed and rings trapped etc.
You'll probably be lucky though
How far is the bit of piston that made contact out of the hole when it's rocking at it's highest ?
And how thick was the gasket ?
That will basically give a clue as to whether you need to delve into bearings or not
The pistons may have just been hitting as they rocked at the top of the bore, which you will hope for.
But potentially there is bearing damage, piston damage, pistons squashed and rings trapped etc.
You'll probably be lucky though
#28
How far are the pistons out of the hole ?
How far is the bit of piston that made contact out of the hole when it's rocking at it's highest ?
And how thick was the gasket ?
That will basically give a clue as to whether you need to delve into bearings or not
The pistons may have just been hitting as they rocked at the top of the bore, which you will hope for.
But potentially there is bearing damage, piston damage, pistons squashed and rings trapped etc.
You'll probably be lucky though
How far is the bit of piston that made contact out of the hole when it's rocking at it's highest ?
And how thick was the gasket ?
That will basically give a clue as to whether you need to delve into bearings or not
The pistons may have just been hitting as they rocked at the top of the bore, which you will hope for.
But potentially there is bearing damage, piston damage, pistons squashed and rings trapped etc.
You'll probably be lucky though
I'm hoping I'm lucky too, the first head was skimmed and funnily enough slightly louder! But when I had it off I couldn't feel any dips on the crown nor any scoring on the bore walls. And it turned over fine by hand with no notching.
Will keep everyone up to date with the outcome. Thanks for the input mate
#31
#32
Need to stop thinking or making assumptions.
Measurement need taken, but either way the pistons have been hitting the heads, regardless of the factors that led up to to happening
Obviously cheapest and easiest fix will be a head gasket, if one is available thick enough.
IF, the pistons do protrude by 0.5mm...which is a lot, you'd need at least a gasket 1.5mm thick
Measurement need taken, but either way the pistons have been hitting the heads, regardless of the factors that led up to to happening
Obviously cheapest and easiest fix will be a head gasket, if one is available thick enough.
IF, the pistons do protrude by 0.5mm...which is a lot, you'd need at least a gasket 1.5mm thick
#33
I don't think fitting a thicker head gasket will really solve this for the long term, if he fits a new gasket without measuring everything up then it will all have to come back off again if the pistons still hit , u NEED to find out why those pistons hit, and what it will do to the compression ratio.
where did u get all your bits from to rebuild, are they new pistons ??? is the crank standard ? if it was me I would take it apart and measure it all up ( as much as u don't want to I can imagine )
where did u get all your bits from to rebuild, are they new pistons ??? is the crank standard ? if it was me I would take it apart and measure it all up ( as much as u don't want to I can imagine )
#34
Need to stop thinking or making assumptions.
Measurement need taken, but either way the pistons have been hitting the heads, regardless of the factors that led up to to happening
Obviously cheapest and easiest fix will be a head gasket, if one is available thick enough.
IF, the pistons do protrude by 0.5mm...which is a lot, you'd need at least a gasket 1.5mm thick
Measurement need taken, but either way the pistons have been hitting the heads, regardless of the factors that led up to to happening
Obviously cheapest and easiest fix will be a head gasket, if one is available thick enough.
IF, the pistons do protrude by 0.5mm...which is a lot, you'd need at least a gasket 1.5mm thick
Cheers
#35
Took the head off over the weekend and took some measurements. Quite clear that's all been hitting!
Measured 0.63mm on the head gasket with a micrometer.
And used a straight metal ruler and feeler gauges to measure the piston deck height. I got 0.72mm above deck on its highest edge/rock and 0.35mm on the lowest edge/rock.
Going to buy a 1.4mm gasket and listen out for any worn big ends. A lot easier than changing them if they turn out to be fine IMO.
Will let you know if I get the rattle of death this weekend!
Some photos:
Measured 0.63mm on the head gasket with a micrometer.
And used a straight metal ruler and feeler gauges to measure the piston deck height. I got 0.72mm above deck on its highest edge/rock and 0.35mm on the lowest edge/rock.
Going to buy a 1.4mm gasket and listen out for any worn big ends. A lot easier than changing them if they turn out to be fine IMO.
Will let you know if I get the rattle of death this weekend!
Some photos:
#38
It was obvious they were hitting from the markings on the piston.
Does the top of the piston look deformed at all in the areas that were hitting ? Or still totally flat ?
Even a 1.4mm gasket, with potentially 0.7mm raised at rock ( which may get worse when warm )...is still cutting it close.
That's only 0.7mm clearance.
It will probably be ok, but it is close
Does the top of the piston look deformed at all in the areas that were hitting ? Or still totally flat ?
Even a 1.4mm gasket, with potentially 0.7mm raised at rock ( which may get worse when warm )...is still cutting it close.
That's only 0.7mm clearance.
It will probably be ok, but it is close
#40
It was obvious they were hitting from the markings on the piston.
Does the top of the piston look deformed at all in the areas that were hitting ? Or still totally flat ?
Even a 1.4mm gasket, with potentially 0.7mm raised at rock ( which may get worse when warm )...is still cutting it close.
That's only 0.7mm clearance.
It will probably be ok, but it is close
Does the top of the piston look deformed at all in the areas that were hitting ? Or still totally flat ?
Even a 1.4mm gasket, with potentially 0.7mm raised at rock ( which may get worse when warm )...is still cutting it close.
That's only 0.7mm clearance.
It will probably be ok, but it is close
Piston is fine, its taken the smooth polished surface away but it's still totally flat, only damage i can see is on #1 in that close up photo, it's the smallest of digs and is on top, hasn't shown any signs of scratching the bore.
Will get the 1.4mm gasket, 0.7mm clearance should be fine, that's the clearance on a standard head after all.
Yes, if i wanted to go and buy a cometic gasket i'd have a huge choice. But the money doubles for a Cometic!