Engine carnage
Turbo Mini Forums

Ok so it's not that bad. Yet! But my guess is it would lead to spectacular failure. Think you guys might like to have a look and guess what happend here:













Questions?

Edited by SadamPl on 19th Jan, 2016.

Made in Poland build thread:
http://www.turbominis.co.uk/forums/index.p...tid=570363&fr=0

had worse lol

this happened 100 mile after an oil change, i used to use comma classic it was purple, this was the 'new' comma classic that was gold, engine dead an hour later never used it since

probably unrelated as it let go at 5500rpm on the motorway after a good 40 minute ride

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Edited by Brett on 19th Jan, 2016.

Yes i moved to the darkside

Instagram @jdm_brett

Oh dear you have been trying, was it a 100,000 engine you wound the boost up and that happend?

Looking at the way the primary has worn the crank i would say its got many launches under its belt !!
And the way the idle gear has warn many miles too

Yes i moved to the darkside

Instagram @jdm_brett

That's tame. Should of seen my tritec engine out my cooper s.

its had a hard life by the looks

the last crank i had in my 1098 was cracked 3/4 the way around the main journal on the filet radius the shop showed me it under the lamp with the ink dye

it did show that it was unhappy on the bearings so i knew something was up

Ok, so I didn't gave you all of the info yet.

Yes it does have a significant mileage, but it's been serviced. It's a 1996 SP Cooper, but crankshaft is not CAM6232, it's been swapped earlier (50000km ago? at least that's what documents say). Bearings look very good unlike the crankshaft. What I also find very unusual is wear on the primary gear journal.

Take a close look at the way bearing cap no. stamped in to gearbox casing I should also add that there was only some selant between engine and gearbox casing. No gaskets. My guess is clearence between idler gears was too tight and caused wear.

Other then that wear on main journals is also much higher on one side of each journal. Since crank was swapped I'm guessing it might have been out of balance, but not sure whether that might be a cause here.

I've seen worse as well, the unusual factor is interesting here. That's why I wanted to share it.

Made in Poland build thread:
http://www.turbominis.co.uk/forums/index.p...tid=570363&fr=0

If there was no gasket, the 2 locating pins (should) still hold the transfer casing in alignment. Were they pressent and still a snug fit? If not, that could mean the lower two transfer gears were twisted out of alignment too. Missing the gaskets off is quite a bodge. Sadly, if the last builder didn't realise they could have made several mistakes along the way that led to this.

Regarding the journal wear, do you mean the wear is different on the front/ back facing end of each journal, or TDC / BDC sides?

Edited by PhilR on 21st Jan, 2016.

Both locating pins were present but they are both in gearbox casing. So no gasket still means engine and gearbox are too close, therefore primary gear/idler gear are too close.

Center journal is worn out at BDC for 2 and 3 cylinder. Other two at BDC for 1 and 4.

Made in Poland build thread:
http://www.turbominis.co.uk/forums/index.p...tid=570363&fr=0

I thought it was quite common to not use the gearbox to block gasket. A bit of sealant was a better option than the gasket.

Maybe I am mistaken.

That makes sense. I was thinking the top dowel was in the block for some reason

I'm planning to test how thick compressed gasket is between gearbox and block when I have oportunity. Will post results.

Made in Poland build thread:
http://www.turbominis.co.uk/forums/index.p...tid=570363&fr=0

It's only a thin paper gasket before it is crushed - if expect the gear mesh to have more tolerance than that

So far it's my only explanation unless anyone has a better idea?

Uncompressed gasket has 0,25-0,3mm. Compressed will be around half of that? Still sealant will be thinner.


I inspected drop gears carefully I can only find sings of wear as if they were pushing against each other. Idler shaft but only on one side, some chipping on the other, crank surface rubbing against primary gear bushings and outer race of the small input gear bearing (one in the transfer case). Also if you look closely you can see the drop gear started to eat into each other (rounded surface on one side of each teeth).

Made in Poland build thread:
http://www.turbominis.co.uk/forums/index.p...tid=570363&fr=0