Technical I have been a buttock

DRSIK · Sep 4, 2015

I just bought a 1242 bottom end of fleabay and did not look clearly enough at the pictures

I now am the owner of a bottom block and NO PISTONS

Does anyone have any pistons and advice on clearances / torque settings for me to fit them.

brinker · Sep 4, 2015

Piston to bore clearance should ideally be 0.030-0.050mm.
Connecting rod clearances should be ~0.010mm.
Remember to check wear on the crankshaft itself as well.
I'm assuming you know how to measure both of these.
Torque for main bearing are 20nM + 90°. Connecting rod bearings are 20nM + 40°.

DRSIK · Sep 7, 2015

brinker said:
Piston to bore clearance should ideally be 0.030-0.050mm.
Connecting rod clearances should be ~0.010mm.
Remember to check wear on the crankshaft itself as well.
I'm assuming you know how to measure both of these.
Torque for main bearing are 20nM + 90°. Connecting rod bearings are 20nM + 40°.

Thanks Brinker - actually this is going to be my first bottom end rebuild so any sage advice (including how to take these measurements) would be appreciated

judderbar · Sep 7, 2015

DRSIK said:
Thanks Brinker - actually this is going to be my first bottom end rebuild so any sage advice (including how to take these measurements) would be appreciated

It is not economical to do what you are doing. Good money after bad unfortunately,

Ziggy122 · Sep 7, 2015

Since punto engines are stupidly cheap - tbh i'd of just brought a 2nd hand engine that you could then rehone/ring and clean up

Ziggy

DRSIK · Sep 7, 2015

Why is that....cheaper to get a low mileage engine off ebay and split it ??

I thought so my self but now I have a bottom end it seems a shame to waste it.

Also some nice cheap pistons on there.. I can get the bores honed cheaply so I thought it would be like a complete new bottom end. MAtch that to my new head and I have a brand new engine.

Still may be overkill...what are everyone's thoughts ???

Ziggy122 · Sep 7, 2015

DRSIK said:
Why is that....cheaper to get a low mileage engine off ebay and split it ??

I thought so my self but now I have a bottom end it seems a shame to waste it.

Also some nice cheap pistons on there.. I can get the bores honed cheaply so I thought it would be like a complete new bottom end. MAtch that to my new head and I have a brand new engine.

Still may be overkill...what are everyone's thoughts ???

If you can say do it for all under 200£ then its should be okay

But just sticking new parts in doesn't always mean it'll be good for X miles

Tollerances are cruitial to how the engine runs

To tight - it'll seize
too loose it'll knock

Ziggy

DRSIK · Sep 7, 2015

But if its done right for under £150.00 you think its worth it ??

brinker · Sep 7, 2015

DRSIK said:
Thanks Brinker - actually this is going to be my first bottom end rebuild so any sage advice (including how to take these measurements) would be appreciated

Here's a couple guides for you - written them myself during my internship last year. Let me know if you've got any questions

http://1drv.ms/1OrCkfA

flisko · Sep 7, 2015

brinker said:
Here's a couple guides for you - written them myself during my internship last year. Let me know if you've got any questions
http://1drv.ms/1OrCkfA

was this guide made in yugoslavia? black and white pictures lolo

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