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RWDboy
Forums Junkie

Location:
South Australia
Registered:
July 2002

Rebuilding Bottom End - need some advice!	Mon, 26 September 2005 10:59

Hey just looking for a few tips/answer as I am about to start work on re-building the bottom end of the 1st gen 3S-GTE I am stuck with. 1. When 'torque-ing' up the conrod bolts, i hear that use a torque wrench is not the preferred method, and that checking the rod-bolt stretch is better. Anyone got anything to add to that? 2. I have also read that plastiguage is not really that good for measuring bearing clearances (such as the clearance between the installed big-end bearing and the conrod). Is it a better idea to use a micrometer to check the internal diameter of the bearing installed in the rod (but obviously not installed on the crank) and also measure the crankshaft journal itself? 3. Does anyone have any tips for getting accurate measurements from a telescoping micrometer when measuring the internal diameter of a conrod/installed bearing etc? As in, common inaccuracies, bad methods etc? 4. Measuring piston skirts etc - i understand that forged pistons require a certain amount of clearance between the bore and the piston skirt. Is it important to get the clearance right at the skirt, or should i check the clearance near the rings and the crown itself as well? 5. Without fancy balancing instruments, what can I check myself reasonably easily in regards to the condition of the crankshaft (aside from the crankshaft journal wear)? I would assume that most crankshafts could either sag, or 'twist' fractionally with age (ie many bazillions of kilometers)? And lastly this is a bit of an aside - machining cast pistons isn't a good idea is it? (i'm no metallurgist). [Report message to a moderator]

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