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Lockie91
PostPosted: Mon Apr 18, 2011 12:28 pm 
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mikearmour wrote:
Lockie91 wrote:
mikearmour wrote:
hey guys,

I'm a new mini owner and just learning my way around mechanical bits so speak slowly :oops:

I've just got a 1275GT which has a 1380 engine in it which has been recently rebuilt. I've got the full list of specs if needed. However i'm finding that i can't start the engine with the clutch in (it simply won't turn over) and if i'm stopped at the lights with the clutch in the engine starts to splutter and die. However if the choke is on the dieing at the lights DOESN'T happen. Idle is quite high (~800-1000, tacho not working) but feels very rough. Previous owner had it dyno tuned but since then put a giant Graham Russell inlet manifold without retuning on it so perhaps that has something to do with it ? Slight rattle in the clutch housing which disappears when clutch is engaged. Clutch has been completely rebuilt with 4 pin diff and all that jazz < 2000km ago.

Any ideas ? i've got it booked in with the local mini mechanic but thats not for 2 weeks and she looks forlorn sitting there not being driven :wink:


hate to say it but low'n blown is correct.

Whoever built the engine put the thurst washers round the wrong way, or failing that have put the incorrect size in.

The choke is just lifting the revs like more idle will, so that's why it helps. I wouldn't drive the car very far, if you can help it NOT AT ALL!!

I've seen the effects of this...

Easy way to tell is up the idle a bit, so it idles ok with clutch in and out.. it will be high tho dont worry about that..

Then get someone to put the clutch in at idle and you stick your head in the engine bay and watch the harmonic blancer move sideways towards the radiator.. It's only maybe 5mm or so slightly, but you will see it if you look good enough as it's travelling at speed.. it's pushing the whole crank sideways in other words...

That also explains the rattle noise when clutch is out..

Engine pull down and replace thrust bearings, and hope that the crank has not been worn from the driving..


thanks guys. i won't drive it anymore until i can get it fixed. Already driven it back 600km from where i bought it so hopefully its not farked :/


lets hope for your sake it's not. But as I said first thing I would do is watch the harmonic balancer and that will tell you straight away..

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mikearmour
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PostPosted: Mon Apr 18, 2011 2:42 pm 
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i'll do that when home from work. i'm guessing that the harmonic balancer should -not- move ?
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simon k
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PostPosted: Mon Apr 18, 2011 2:57 pm 
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mikearmour wrote:
i'll do that when home from work. i'm guessing that the harmonic balancer should -not- move ?


yep... Lockie is saying it might move away from the motor when you push your foot on the clutch. However being a new motor, the amount of movement could be miniscule

I've rethought what I said about that 7/16 bolt - was the motor professionally built? IE is there a warranty?
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mikearmour
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PostPosted: Mon Apr 18, 2011 3:35 pm 
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simon k wrote:
mikearmour wrote:
i'll do that when home from work. i'm guessing that the harmonic balancer should -not- move ?


yep... Lockie is saying it might move away from the motor when you push your foot on the clutch. However being a new motor, the amount of movement could be miniscule

I've rethought what I said about that 7/16 bolt - was the motor professionally built? IE is there a warranty?


i've got receipts showing it was professionally built about 18 months ago. However since then its had a megajolt system installed by the previous owner and from my very basic understanding that involves replacing the crank and after contacting him today he confirmed that it has had this problem since thats been done but he didn't think it was serious :x as for a warranty it did have one but unfortunately that ran out about a year ago
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simon k
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PostPosted: Mon Apr 18, 2011 3:56 pm 
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mikearmour wrote:
simon k wrote:
mikearmour wrote:
i'll do that when home from work. i'm guessing that the harmonic balancer should -not- move ?


yep... Lockie is saying it might move away from the motor when you push your foot on the clutch. However being a new motor, the amount of movement could be miniscule

I've rethought what I said about that 7/16 bolt - was the motor professionally built? IE is there a warranty?


i've got receipts showing it was professionally built about 18 months ago. However since then its had a megajolt system installed by the previous owner and from my very basic understanding that involves replacing the crank and after contacting him today he confirmed that it has had this problem since thats been done but he didn't think it was serious :x as for a warranty it did have one but unfortunately that ran out about a year ago


installing the megajolt doesn't require replacing the crank, only the pulley on the end of it (the one Lockie is asking you to look at)

if it's been doing it since the engine was built.... you might have bought yourself some trouble

Take it to a mini specialist mechanic
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GT mowog
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PostPosted: Mon Apr 18, 2011 4:05 pm 
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If the engine was overhauled 18 months or so ago, I guess it's done a few Kms in that time so I very seriously doubt it would be crank thrusts, more like clutch thrust bearing.

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smac
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PostPosted: Mon Apr 18, 2011 4:43 pm 
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Ya kinda surprised people are suggesting the big ticket items here first off, when there's a load of easy fixes that could give the same symptoms.
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simon k
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PostPosted: Tue Apr 19, 2011 4:26 pm 
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GT mowog wrote:
If the engine was overhauled 18 months or so ago, I guess it's done a few Kms in that time so I very seriously doubt it would be crank thrusts, more like clutch thrust bearing.


yeah, except he said the PO said it had done that from the start...

needs a mini mechanic to look at it
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GT mowog
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PostPosted: Tue Apr 19, 2011 4:34 pm 
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simon k wrote:
GT mowog wrote:
If the engine was overhauled 18 months or so ago, I guess it's done a few Kms in that time so I very seriously doubt it would be crank thrusts, more like clutch thrust bearing.


yeah, except he said the PO said it had done that from the start...

needs a mini mechanic to look at it


Simon, you know as well as most of us that the crappy 7W5/8 Bearings bearly last to the corner store. He should fit one of your 3W5/8's, last forever.

If it were crank thrusts it would give trouble way before now.

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mikearmour
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PostPosted: Sat Apr 30, 2011 2:40 pm 
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hey guys,

just a small followup; revs don't drop at idle and can't seem to see if the harmonic balancer moves. However the stalling at idle when the clutch is in has suddenly stopped after the car wasn't used for 2 weeks. started it up yesterday , let it warm up, popped the choke off and put in the clutch. no problems. turned off, started it with the choke off and clutch in, no problems. no rattle from the clutch area either. took it for a drive. no stalling. so will keep an eye on it for the next week or so, but i've got no idea how it could have 'fixed' itself

thanks for all your advice :)
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