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Crank Not Turning Now Gearbox Is On


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#1 shish_happens

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Posted 12 August 2019 - 09:20 PM

Hi all,

Just finished putting the pistons in my A+ 998 engine. Tried turning the crank, was a little hard to do by hand but fairly easy with some leverage. Then I put the gearbox on and gave the crank a couple of turns just to be sure everything was good. But the more I turned the crank the stiffer it got until the point where it was causing the inch or so diameter screwdriver I used before to bend with the crank going nowhere. I haven't got the timing chain on so it's literally just the crank with the pistons. Which were fine before the gearbox was on. My first time putting an engine back together as well but I can't think what I've done wrong?

Any help appreciated

Thanks

#2 cal844

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Posted 12 August 2019 - 09:34 PM

Strip it and look for light score or bind marks, it could be a few things, one being a bearing cap on the wrong way around

Edited by cal844, 12 August 2019 - 09:34 PM.


#3 shish_happens

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Posted 13 August 2019 - 12:22 AM

Strip it and look for light score or bind marks, it could be a few things, one being a bearing cap on the wrong way around


Cheers hopefully nothing too bad when it's apart

#4 Moke Spider

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Posted 13 August 2019 - 02:14 AM

Without the Timing Chain, if you have the Cam fitted, the Big Ends have likely fouled and now jamed on to one of the Cam Lobes.



#5 timmy850

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Posted 13 August 2019 - 04:38 AM

Did you remove the pistons?
Are the bearing caps on the right rods?
Are the rods in the correct order in the engine?
Are the main bearing caps in the right spot and around the right way?

#6 Dusky

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Posted 13 August 2019 - 06:12 AM

Strip it and look for light score or bind marks, it could be a few things, one being a bearing cap on the wrong way around

Because that magically happens when you fit a gearbox.


@OP crank and cam can hit each other. Connect the timing chain first.

#7 Pigeonto

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Posted 13 August 2019 - 09:23 AM

If it was ok until you fitted the gearbox to the block then it's got to be related to the way they've gone together

Have you made any alterations at all to the main bearing bolts ? Such as added hardened washers under the bolt heads, used new bolts with a taller hex ?

I'd loosen the gearbox-to-block fixings a little and see if it frees off back to how it was, if so there's a clearance issue and it can be a main cap bolt hitting one of the gearbox webs


Edited by Pigeonto, 13 August 2019 - 09:24 AM.





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