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Mysterious engine problems...

One month ago, Marin and I went to garage to start engine and play with MS. Everything went nicely, and after few hours engine started perfectly every time - that means that cranking settings are probably OK now.

Afterstart enrichement also seemed OK , because car engine doesn't stall few seconds after cranking - idle goes pretty high immediately to prevent stall after cranking and then for about five minutes warmup enrichement holds idle at around 1300-1500 RPM, until coolant temperature comes to about 70°C.

Then A/f mixture is read by VE table. But, when everything seems perfect - some s**t must happen, Murphy's Law didn't avoid us unfortunately :-(

The thing is that one day when we wanted to start car, one little transistor (known in MS-EFI community as notorious "Flyback transistor") decided to die that day together with his companion (FET driver chip) and leave us alone - because of that , all 4 injectors stayed open continuosly - engine flooded, and when we noticed that it was too late, crazy amount of fuel went through big 330cc injectors and filled up combustion chambers (and good part of the oil sump too) - Marin quickly shut down engine and MS...

After little investigation, we find dead transistor and chip as we expected, everything else with MS was fine - I took chip and transistor from my MS and car fired up very hardly and strangely , and also worked very badly, like it doesn't rev freely.I immediately suspected that we hydrolocked engine - it can happen, as can be read on MS-EFI forum.So Marin was pretty dissapointed and decide to tear appart complete engine to see what surprises are hiding down there, but the greatest surprise for us was that there are no surprises there , hmmmm....

 

This is the suspicious engine - even if that engine is damaged somehow it really doesn't matter any more, beacuse Marin finaly has 1600cc engine ready for dropping in, so he dismantled this engine only for 2 reasons:

First reason is his famous curiosity.

And second reason - he just loves dismantling engines in cold winter afternoon :-)

Marin is attacking engine carefully but quickly from all sides with his bare hands - when someone would decide one day to organize "Fiat SOHC Engine Removing Competition", Marin would be placed probably very highly, I guess somewhere at Top 3....seriously, would you dare to compete with man who doesn't need wrenches, just look at the picture ;-)))

But when the tough gets going, even Marin must use tools, this time he took extra long socket #13, so he can rotating rachet elegantly with his one finger...;-)

Finally some fluids can be seen - engine fluids, not body fluids, of course :-()

Marin removed camshaft cover and now is removing head bolts.

 

All head bolts are removed, but before that , we'll check oil that was in camshaft housing...

...as we expected, there was large quantity of gasoline in oil - engine flooded and large amount of fuel passed through piston rings in oil sump and mixed there with rest of engine oil. Luckily everything looks great: complete camshaft mechanism seems OK, without any trace of seizure or other damage due large amount of gasoline in oil.

 

 

After we checked camshaft, Marin removed carefully head and on pic he is removing headgasket - he was very excited because he expected some damage there , in fact he was in very cheerful mood - to someone who doesn't knew him it could sound crazy, but for me it's normal because I know that Marin can't wait to remove that engine and put 1600 engine with large turbo he,he...

 

But as I told before - everything looks great - what the f**k ?!?!?!

 

 

We tried to rotate engine with wrench placed on crankshaft - now without head and compression, somebody would expect that engine must rotate totaly easily - sounds logical to you? Of course it does!

Sounds logical to me and Marin? Of course it does!

So we took a wrench as two normal people and tried to rotate engine ...

 

...but that stupid bastard just didn't want to rotate easily !!! AARRGH!!

It's very strange thing , so we took a look inside cylinders - there are no scratching or seizuring signs - everything looks OK...even cross-hatch signs from cylinder machining are still evident...this is crazy...

 

We then tried to rotate few times to check all cylinders and now on every rotation it seems that there is a position where engine is almost stuck completely and almost impossible to rotate, after lots of torque it somehow moved, and then on next rotation again almost stuck on same position ...what's the fuckin' problem then ?!?!

Maybe slightly bent rod, maybe broken rings, maybe ugly gremlins inside oil sump are blocking crankshaft and laughing to Marin and me...

I think that with our luck, 3rd scenario is far more realistic then other two ....

 

But after few really hard pushes, we heard some strange sound , like "klang! "and with some miracle somehow engine rotated more freely - what happened ? Something let loose? Who cares now , engine must go out very soon anyhow...

We really don't know what happened but we were exhausted from manual engine rotating and I said to Marin that he now can turn on the electric starter and I'll check cranking speed...just to see what will happen...

 

And this is the result - something interesting - a video clip of Uno Turbo 1.3 IE engine cranking without head - hey, I bet you don't see pistons moving up and down in cylinders every day ;-)

---To download : right click on pic and then "Save link as"---

Clip is about 590 kB large....have fun!

Engine cranks easily now, as can been seen on clip...but soon his larger SOHC relative will come on his place anyway - so this is his last cranking probably in this year....

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