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Home > Help Needed / General Tech Chat > why is my engine so hard to turn over after rebuilding?!

Gilly2006

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Member #: 1720
Member

Bamber bridge, Preston

hi im from the mini forum, and i need some help.
i had just built my engine but i can't turn the crank over with an A-J on the crank pully, i can torque 3 big ends down but when i come to torque cylinder 2 down the crank just locks up!!
i can't fiqure it out. someone said i need a new rod and big end. but i just wanted to know what everyone thought on here.

Thanks.


Rod S

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5988 Posts
Member #: 2024
Formally Retired

Rural Suffolk

I dont post on TMF so can't comment on what they might have said but I guess the obvious questions are,
1 - Is the rod the right way round ? (they are handed but to such an extent I would believe it impossible to physically put it in backwards, but..... you never know.....)
2 - are the big end shells in right ? (ie, tangs properly sitting in the cut-outs)

And if that's all OK, are these new shells or ones you took out and have re-used?

Whichever, look at the ones that came out to see if they have wear on one edge only which would suggest a bent rod...

Schrödinger's cat - so which one am I ???


Jason G

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4360 Posts
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En-suite user

Braintree, Essex

I take it you kept them in order when you dismantled it? Numbered them etc?

Edit; What condition were the old shells in? Have you any pics?

Edited by Jason G on 25th Feb, 2008.

On 19th Jan, 2010 wil_h said:
I would start the furthest place from the finish.


On 24th Mar, 2012 apbellamy said:
I feel all special knowing that I've given your mum my wood.


Been neglecting Turbo'd 'A' series..............


Turbo Phil

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My sister is so fit I won't show anyone her picture

Lake District

What exactly have you changed ? is everything still standard ?

WWW.TURBO-MINI.COM


Joe C

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12307 Posts
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Carlos Fandango

Burnham-on-Crouch, Essex

You can put them in the wrong way, I did it on the first A series I rebuilt, IIRC it made the engine tigt to turn over but not imposible so it could be this.

Interestingly when i figured it out and swapped them round the right way and torqued the rod bolts up most of them broke. dunno if it was related.




On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



Jay#2

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Northern Ireland (ex AUS)

If you've got new bearing shells, make sure you've been given the right ones (regardless what they've been stamped with)!

On 7th Nov, 2008 Nic said:
naeJ
m
!!!!!!sdrawkcab si gnihtyreve ?droabyekym ot deneppah sah tahw ayhwdd


AlexF2003

5795 Posts
Member #: 80
AFRacing LTD

Newbury, Berks

bearing cap the wrong way round

-or-

wrong size bearing/journal.

Alex

AlexF


Turbo Tel

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1060 Posts
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Post Whore

Delaware, USA




On 25th Feb, 2008 AlexF2003 said:
bearing cap the wrong way round

-or-

wrong size bearing/journal.

Alex


On my engine the the "tangs" are both on the same side. unless you have had them reworked you should be able to see evidence of where the tangs used to be. At least check that all the pistons have the tangs in the same place.

Plastigage will tell you if the bearings/journals are the wrong size.

Terry

website:- http://www.terryhunt.co.uk


joeybaby83

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6274 Posts
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Isle of Man

the problem is tmf, the engine gods hate tmf, and are punishing you for your betrayal

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"



Rod S

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5988 Posts
Member #: 2024
Formally Retired

Rural Suffolk

Surely someone on TMF should have suggested the use of an angle grinder by now ???

(Sorry, couldn't resist that one....)

Schrödinger's cat - so which one am I ???


IN RAINBOWS

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39 Posts
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pontefract




On 25th Feb, 2008 joeybaby83 said:
the problem is tmf, the engine gods hate tmf, and are punishing you for your betrayal


LOL*laughing*

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