crank shaft main bearing

[nrg19uk]

i have a problem im in the process of changing my main bearings but these washers are confusing the hell out of me!! which way round should they go? the manual says one thing but when i pulled them about it was the other way round? there is also a chamfer on the smaller washer also it doesnt mention which way round the larger oil seal should go?



(fit the inner thrust ring to the timing gear side of the crankshaft so that the inner chamfer faces to the crankshaft side.  Then fit the second washer and woodruff key)

[Rusty's Uncle]

The smaller thrust washer goes on first with that inner chamfer against the crank then the "piston ring" type seal with the plain face facing outwards and recessed face on the inside 

[Pete126]

This may help

http://club126uk.co.uk/smf/index.php?topic=4892.0

[nrg19uk]

Cheers gents just how I thought 


I didn't wanna have to pull the engine apart again because I didn't double check.

Thanks

[nrg19uk]

yet another problem has sprung up on my 126  , i was in the process of changing over all the main engine parts for new.

ive order lots of new parts all to fit a 650cc only to get to the point of fitting the piston rings which are massive compared to my little pistons after contacting the supplier to ask there advice i took a trip to the engineering shop only to be told my engine bore size is 73.5 which makes it a 600cc    (bangs head against the wall) im starting to wonder if my car was a friday afternoon model!!!! 

now how do i go about fixing this i have the new rings, new copper gasket all for the 650 i would prefer it to be 650 is it just the pistons and the cylinders that need changing?

[Pete126]

Hi Neil,
Sounds like someone has replaced the engine with a 600cc at sometime, If you can find a pair of good second-hand Barrels and Piston + the bottom seals for the barrels. I'm sure someone on the forum will have a set kicking about, if not 126Fan sell them for a good price 

[nrg19uk]

hi pete ive been scratching my head all day looking on the forum also and it seems like i have a 594cc going by my crankcase number 126 600cc (594cc) engine, code is A.000 (made in Poland and Italy)
but my cylinder head is marked up 650. 

so what ive gathered is i need to get the crankcase machined to match the barrels + the pistons and i would have a 650cc.


if anyone has a pair of barrels and pistons floating about and they need some pocket money for christmas then please send me a message )   

[1973/126]

 I`ve got a whole engine kicking about, but not sure how the barrels are, as I have`t had the head off. It turns freely.
 Whereabouts in Kent are you?
 

[nrg19uk]

I`ve got a whole engine kicking about, but not sure how the barrels are, as I have`t had the head off. It turns freely.
 Whereabouts in Kent are you?
 

Message sent )

[nrg19uk]

a big thankyou to lad (1973/126) for the engine and a nice cuppa tea 

its in a million pieces already 

[bis13]

dont do anything to the 600cc engine keep it as it is as they are getting rarer all the time, a 650 head on the 600 engine is what you had from reading the thread did you have a problem with the way the engine ran as the combustion chamber/head would sit further out making it larger than it should be? i think Dajwid has a 600 head for some reason ask him if he has then i suggest getting hold of that.

[nrg19uk]

i did wonder about the 600cc head and where i would source one, it seemed to go (ok) i managed to drive a few hundred miles like it lol


i started to strip this new engine and apart from it being really dirty it all seems in fairly good condtion apart from the piston rings had seized into postion the normal conrod shims need replacing, and the timing oil seal washer is broke. and a couple of snapped bolts but im getting good at drilling those out now 

so its getting a cheeky wash in the dish washer tomorrow  and gonna go all out on this engine with all the parts i had for the so called 650.

i have noticed a big difference already the casting of the crankcase is astonishing on the 650 loads of flash lines not ground back..

[nrg19uk]

just had the worse day in history ive had to walk away from the garage before all my 126 parts end up in the bloody skip.!!! this bloody engine is going to get done even if it kills me in the bloody process.


i starts off putting all the brand new bearings etc all from the 600 in to the 650 wacked my thumb and kept dropping tools bolts etc stopped for a cuppa and a breather carried on putting all the head back on, nice new copper head gasket torqued it all up put the rocker gear on thought this is going nicely put the fly wheel on turn round to look at the haynes manual for the torque settings when i hear a sickning thud   look round to my nice new engine face planted the floor  


grown man about to burst into tears!!!


i stand it up to look for any broken bits to my horror the exhaust outlet has a split!!!  





so i chucked it back on the bench and had to strip it back down to remove the head again before the well seal had set...

that was time to call it a day before the sledge hammer replaced the socket set    



do you think it can be welded?

[Rusty's Uncle]

OH that is some bad excretia there my man ! 
What does it look like looking straight onto the flange face ?
Welding is a pos but just wondering if you can get away without it ?

[nrg19uk]

Split all the way from the top to the exhaust hole through the bolt hole.