[urq] Rebuild engine seizes after 15sec's . ( non audi )

[Lino Valadas]

Fluid build up on top of the Pistons? Either antifreeze or oil from a bad gasket somewhere?  Just guessing of course.

Lino
83 Ur-q

Sent from my iPad

> On Oct 30, 2014, at 6:52 PM, Patrick Carlier <p.carlier at pandora.be> wrote:
> 
> So guy's , i'm a bit at wits end here . 
> 
> Car is a 1987 nissan coupe , 8 valve carb , 1600cc . ( E16s engine ) 
> Bought it as a fisrt car for my 17 year old son who's very enthousiastic about it :) .  
> 
> It came with a known broken engine , head froze to pieces . 
> Found me a 1500 Turbo ( E15ET)  engine with severe big end damage 
> The blocks  are identical as are the heads , only the 1500 crank throw is smaller , and the compression is lower . 
> 
> With a bit of this and a bit of that I put together a complete engine 
> Had the 1500  honed , and the head shaved . 
> Used the 1600 pistons and conrods with new pistons rings . 
> The 1600 crankshaft was also used with its main bearings shells  in the 1500 caps . 
> Bit of a puzzle , i know :) . 
> And i've put in new conrod beraings . 
> Meaning all moving parts are either new or matched as they were . 
> 
> Assembled it all , put it in the car , and fired it up . 
> It won't  really idle , most likely a carburettor problem , so I have to rev it a bit , and use the accelerator pump 
> to keep it going .I can keep it running at abt 1500 rpm 
> 
> It runs for about 15 seconds and then it stalls . 
> Dead stop all of a sudden . 
> Tried to start again , and the starter engages but fails to  crank the engine . 
> Using a wrench at the crankshaft pulley , with the plugs removed , and it barely turns . 
> Looking inside shows no sign of hydrolock 
> Wait 10 minutes , and all's back to normal . 
> Engine fires right up , and seizes again after thesame 15 to 20 sec's  time period . 
> Plugs are oily when pulled , fresh oil , not burned or carbonized . . 
> With a cold engine and the plugs removed I can turn the crank with my bare hands by grabbing the crankshaft pulley . 
> Also tried two grades of oil , 10w40 and 20w50 , no avail . 
> 
> Now I've done my share of engine rebuilds and I've never seen this before . 
> And quite frankly , I don't quite know where to go from here . 
> Sure , I need to pull it apart , buit then what ? 
> 
> Any thouhts , comments btdt's ..... 
> 
> 
> Pat 
> VERY unhappy for now . 
> . 
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