Disco 1 3.9 V8 - Cranking speed?
Discussion
How fast does the starter normally turn these things over when all is well?
I've just picked up my first ever Disco, and to me it seems too slow when turning over, as if the battery is flat sort of speed. (It isn't, it's the same with boosters on).
When I picked it up, it fired. Went to fill it up a couple of miles later and it wouldn't go. Now it starts Ok but still cranks slowly.
Any thoughts?
Thanks
I've just picked up my first ever Disco, and to me it seems too slow when turning over, as if the battery is flat sort of speed. (It isn't, it's the same with boosters on).
When I picked it up, it fired. Went to fill it up a couple of miles later and it wouldn't go. Now it starts Ok but still cranks slowly.
Any thoughts?
Thanks
paintman said:
Or the engine to body earth leads are badly corroded. Common as vehicles age. The plastic covered ones can corrode away under the sheath so whilst the ends look OK there's little or nothing there.
Try connecting a jump lead from the battery earth terminal directly to the block & see if that improves matters.
Wouldn't hurt to fully charge the battery with a mains charger just to check.
I'll try that when I get home, thanks.Try connecting a jump lead from the battery earth terminal directly to the block & see if that improves matters.
Wouldn't hurt to fully charge the battery with a mains charger just to check.
Then I'll look at another battery.
At first I thought it was exhaust blowing noise, as I have heard similar from a previous RV8 I had.
However, it gets louder once the engine has warmed up. You can hear it when cold, but you can really hear it when warm. It is only there when under load. At cruise/idle I can hardly hear it, if at all. Temperatures are holding low and after 100 miles or so it hasn't lost any water.
Shame really, the body isn't that bad. Nothing I shouldn't be able to fix. Trust the expensive bit to be broken! That'll teach me to buy unseen from ebay!
EDIT - right bank, sounds like a heatshield rattling, that sort of noise. But it isn't. It sounds high on the engine/rocer area but that could be deceptive.
However, it gets louder once the engine has warmed up. You can hear it when cold, but you can really hear it when warm. It is only there when under load. At cruise/idle I can hardly hear it, if at all. Temperatures are holding low and after 100 miles or so it hasn't lost any water.
Shame really, the body isn't that bad. Nothing I shouldn't be able to fix. Trust the expensive bit to be broken! That'll teach me to buy unseen from ebay!
EDIT - right bank, sounds like a heatshield rattling, that sort of noise. But it isn't. It sounds high on the engine/rocer area but that could be deceptive.
Edited by marksx on Tuesday 11th February 12:07
I like the idea of an easy fix!
I took a rubbish video to try and give you an idea.
http://www.youtube.com/watch?v=jucIWO6ZVOo
It doesn't convey the noise perfectly, it sounds more like a knock in the video, but you get the idea.
I took a rubbish video to try and give you an idea.
http://www.youtube.com/watch?v=jucIWO6ZVOo
It doesn't convey the noise perfectly, it sounds more like a knock in the video, but you get the idea.
camel_landy said:
..and if you've got a split weld in the down pipe joints. 
M
Top marks!M
I'm still unsure as to whether this is the source of the noise. All manifold bolts and downpipe bolts are tight.
New video.
http://www.youtube.com/watch?v=r_c2fRzQbac
Edited by marksx on Sunday 16th February 16:03
Edited by marksx on Sunday 16th February 16:08
camel_landy said:
Oooohhh... That's sounding a bit rough!
Is that manual? If so, were they ever fitted with a dual mass flywheel (you can see where I'm going with this...)??
Another little trick you can use to help narrow down your search is to use a length of hose pipe; Use it like a stethoscope. With one end held to your ear, move the other end around the engine bay until you've found the source of your noise.
M
No, it's an auto.Is that manual? If so, were they ever fitted with a dual mass flywheel (you can see where I'm going with this...)??
Another little trick you can use to help narrow down your search is to use a length of hose pipe; Use it like a stethoscope. With one end held to your ear, move the other end around the engine bay until you've found the source of your noise.
M
I'll try the hosepipe trick. I can't get where I want to with a screwdriver but that should work.
Thank you
paintman said:
As its an auto it could be the flex plate has cracked. The centre of this plate bolts to the crankshaft & the outer is bolted to the 4 lugs on the engine side of the torque converter.
Remove the vertical cover at the lower front of the bellhousing & have a look.
But start by dealing with that blow on the exhaust, just to eliminate any noise that may be making.
Not entirely sure what a flex plate is but I'll have a look! Remove the vertical cover at the lower front of the bellhousing & have a look.
But start by dealing with that blow on the exhaust, just to eliminate any noise that may be making.
Is it the same as a flywheel?
Update - flex plate is good. No cracks that I can see.
After much poking around, I think the noise is the right cat. Poking a screwdriver on the cat I can hear the rattle. Nothing when on the other side, and nothing when on the manifold higher up.
Now to find new downpipes. Or second hand anyway, new are expensive!
After much poking around, I think the noise is the right cat. Poking a screwdriver on the cat I can hear the rattle. Nothing when on the other side, and nothing when on the manifold higher up.
Now to find new downpipes. Or second hand anyway, new are expensive!
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