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Old 06-13-2010, 07:26 PM
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Fired new motor big problems.

Fired up my newly built 4 banger today. Got some major issues.

Compression is 125 across the board.

The engine will run fine for around 2 minutes cold, then I hear what sounds like lifter tick getting progressively louder, then the motor abruptly stops. Almost like something is heating up and seizing the motor. The starter will still turn the motor over but it will drag a bit more. I cranked the motor over several times by hand with the timing belt... Never had an issue. I primed the oil pump before installing the timing belt. Oil seeped out all the rockers as it should. Oil pressure jumps to the middle of the gauge on start up and never really drops.

I pulled the filter and cut it open. Motor ran approx 30-40 mins today total. There are small alum flakes, but nothing I'd consider major. The rings had plenty of gap (if anything on the loose side). Motor was STD bore, Bearings and rods both cut .010. ACL bearings for all.

The only thing I could think of that doesn't involve pulling the motor again this has some thing to do with the transmission? I haven't put wheels on the car yet and it's still on stands. With the car idling, I noticed when I was setting the timing the front wheel hubs were turning slowly? I don't have the Transfer case hooked up at the moment... is this normal? Could the clutch be heating up and stopping the motor? I reinstalled my old 2600 pressure plate with a new ACT street disc, new throwout bearing.

I'm stumped. And slightly pissed off to say the least! Any help appreciated.



Last edited by ForceFed86; 06-13-2010 at 07:46 PM.
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Old 06-14-2010, 09:29 AM
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What engine?
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Old 06-14-2010, 08:27 PM
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4g63t mitsubishi 2.0.

Strange it runs great sounds like a sewing machine for about the first 5 mins. Then slight valve tap (possibly rod knock who knows) that progressively gets louder until the motor shuts itself off. The engine can still eb turned over but it is difficult and the starter drags a bit. I did a comp test immediately after the motor quit. Roughly 125 across the board. Same as cold.

Drained the oil and it is not dark or burnt smelling.

Cut the filter and there are small alum flakes nothing major.

Oil pressure does not drop when the motor "seizes".

Bought the pistons and rings as a set, both STD bore 5k miles on them. I checked teh gap before installing as well.

I think it has something to do with the gear oil pump hydraulic locking.
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