[urq] Rebuild engine seizes after 15sec's . ( non audi )
Patrick Carlier
p.carlier at pandora.be
Thu Oct 30 15:46:48 PDT 2014
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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